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https://github.com/Kelsidavis/WoWee.git
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78c7aed888
64th procedural texture: vertical rust drips on a metal base. Each streak is a hash-derived (x position, width 1..4 px, top y, length H/3..H) band that fades from full rust at the top to bg at the bottom — the "streak" effect of years of rain washing rust down from rivets and seams. Distinct from --gen-texture-rust (generic surface noise) — this is the directional-drip variant for: • weathered metal walls (especially under high windows) • sewer-grate backings under standing puddles • ship-hull stains below scupper ports • abandoned-machinery panels under leaking pipes Deterministic from seed: re-running with same args produces the byte-identical image. Default 40 streaks at 256x256 gives a reasonable "lightly aged" intensity; bump streakCount for heavier corrosion.
4851 lines
209 KiB
C++
4851 lines
209 KiB
C++
#include "cli_gen_texture.hpp"
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#include "cli_arg_parse.hpp"
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#include "cli_png_emit.hpp"
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#include <algorithm>
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#include <cmath>
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#include <cstdint>
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#include <cstdio>
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#include <cstring>
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#include <string>
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#include <tuple>
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#include <vector>
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// stb_image_write impl lives in texture_exporter.cpp;
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// we just need the declaration of stbi_write_png.
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#include "stb_image_write.h"
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namespace wowee {
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namespace editor {
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namespace cli {
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namespace {
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// Shared hex-color parser used by every texture generator.
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// Accepts "RRGGBB", "rgb", or those forms with a leading '#'.
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int handleCobble(int& i, int argc, char** argv) {
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// Cobblestone street pattern. Each pixel finds its
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// nearest "stone center" in a perturbed grid (Worley-
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// style cellular noise) and uses the distance to that
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// center to draw the stone face vs. mortar gaps. Stones
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// get small per-stone tint variation so the surface
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// doesn't read as flat.
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std::string outPath = argv[++i];
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std::string stoneHex = argv[++i];
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std::string mortarHex = argv[++i];
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int stonePx = 24;
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uint32_t seed = 1;
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int W = 256, H = 256;
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parseOptInt(i, argc, argv, stonePx);
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parseOptUint(i, argc, argv, seed);
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parseOptInt(i, argc, argv, W);
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parseOptInt(i, argc, argv, H);
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if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
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stonePx < 8 || stonePx > 512) {
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std::fprintf(stderr,
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"gen-texture-cobble: invalid dims (W/H 1..8192, stonePx 8..512)\n");
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return 1;
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}
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uint8_t sr, sg, sb, mr, mg, mb;
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if (!parseHexOrError(stoneHex, sr, sg, sb, "gen-texture-cobble")) return 1;
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if (!parseHexOrError(mortarHex, mr, mg, mb, "gen-texture-cobble")) return 1;
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// Seeded hash → stone center jitter + per-stone tint.
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// Hash takes (cellX, cellY, seed) and returns 4 floats
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// in [0,1): two for offset, two for tint variation.
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auto hash01 = [seed](int cx, int cy, int comp) -> float {
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uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
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static_cast<uint32_t>(cy) * 668265263u +
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seed * 2147483647u +
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static_cast<uint32_t>(comp) * 16777619u;
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h = (h ^ (h >> 13)) * 1274126177u;
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h = h ^ (h >> 16);
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return (h >> 8) * (1.0f / 16777216.0f);
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};
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std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
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// For each pixel, find min distance among 9 neighboring
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// jittered cell centers (3x3 around current cell). The
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// closest center owns the pixel; second-closest sets
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// mortar boundary distance.
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for (int y = 0; y < H; ++y) {
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int cy0 = y / stonePx;
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for (int x = 0; x < W; ++x) {
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int cx0 = x / stonePx;
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float bestD = 1e9f, second = 1e9f;
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int bestCx = 0, bestCy = 0;
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for (int dy = -1; dy <= 1; ++dy) {
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for (int dx = -1; dx <= 1; ++dx) {
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int cx = cx0 + dx;
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int cy = cy0 + dy;
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float jx = (hash01(cx, cy, 0) - 0.5f) * 0.7f;
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float jy = (hash01(cx, cy, 1) - 0.5f) * 0.7f;
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float ccx = (cx + 0.5f + jx) * stonePx;
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float ccy = (cy + 0.5f + jy) * stonePx;
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float dxp = x - ccx, dyp = y - ccy;
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float d = std::sqrt(dxp * dxp + dyp * dyp);
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if (d < bestD) {
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second = bestD;
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bestD = d;
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bestCx = cx;
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bestCy = cy;
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} else if (d < second) {
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second = d;
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}
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}
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}
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// Pixels close to the boundary (small gap between
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// closest and second-closest) become mortar.
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float boundary = second - bestD;
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float mortarThresh = stonePx * 0.10f;
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if (boundary < mortarThresh) {
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size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
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pixels[i2 + 0] = mr;
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pixels[i2 + 1] = mg;
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pixels[i2 + 2] = mb;
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} else {
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// Per-stone tint: ±15% on each channel.
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float tint = 0.85f + 0.30f * hash01(bestCx, bestCy, 2);
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// Subtle radial darkening toward edges so
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// the stone face reads as 3D rounded.
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float edgeFalloff = std::min(1.0f,
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(boundary - mortarThresh) / (stonePx * 0.4f));
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float shade = (0.7f + 0.3f * edgeFalloff) * tint;
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size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
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pixels[i2 + 0] = static_cast<uint8_t>(
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std::clamp(sr * shade, 0.0f, 255.0f));
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pixels[i2 + 1] = static_cast<uint8_t>(
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std::clamp(sg * shade, 0.0f, 255.0f));
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pixels[i2 + 2] = static_cast<uint8_t>(
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std::clamp(sb * shade, 0.0f, 255.0f));
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}
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}
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}
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if (!savePngOrError(outPath, W, H, pixels, "gen-texture-cobble")) return 1;
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std::printf("Wrote %s\n", outPath.c_str());
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std::printf(" size : %dx%d\n", W, H);
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std::printf(" stone/mortar : %s / %s\n",
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stoneHex.c_str(), mortarHex.c_str());
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std::printf(" stone px : %d\n", stonePx);
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std::printf(" seed : %u\n", seed);
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return 0;
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}
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int handleMarble(int& i, int argc, char** argv) {
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// Marble pattern via warped sinusoidal veining. The
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// canonical "marble shader": take a sine wave, warp its
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// input by smooth multi-octave noise, raise the absolute
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// value to a high power so the bright vein bands stay
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// narrow. Result: irregular bright veins on a base color
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// that tile with octave-driven low-freq variation.
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std::string outPath = argv[++i];
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std::string baseHex = argv[++i];
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std::string veinHex = argv[++i];
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uint32_t seed = 1;
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float sharpness = 8.0f;
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int W = 256, H = 256;
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parseOptUint(i, argc, argv, seed);
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parseOptFloat(i, argc, argv, sharpness);
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parseOptInt(i, argc, argv, W);
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parseOptInt(i, argc, argv, H);
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if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
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sharpness < 1.0f || sharpness > 64.0f) {
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std::fprintf(stderr,
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"gen-texture-marble: invalid dims (W/H 1..8192, sharpness 1..64)\n");
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return 1;
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}
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uint8_t br, bg, bb_, vr, vg, vb;
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if (!parseHexOrError(baseHex, br, bg, bb_, "gen-texture-marble")) return 1;
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if (!parseHexOrError(veinHex, vr, vg, vb, "gen-texture-marble")) return 1;
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// Cheap multi-octave noise: 4 sin/cos products at
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// doubling frequencies, seeded phase per octave. Smooth
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// and tiles imperfectly but for marble we want some
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// irregularity anyway.
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float seedF = static_cast<float>(seed);
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auto warpNoise = [&](float x, float y) -> float {
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float n = 0.0f;
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float freq = 0.02f;
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float amp = 1.0f;
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float total = 0.0f;
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for (int o = 0; o < 4; ++o) {
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n += amp * std::sin(x * freq + seedF * (1.0f + o)) *
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std::cos(y * freq + seedF * (0.6f + o));
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total += amp;
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freq *= 2.0f;
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amp *= 0.5f;
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}
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return n / total; // -1..1
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};
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std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
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for (int y = 0; y < H; ++y) {
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for (int x = 0; x < W; ++x) {
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// Warped sine: vein density is sin(turbulent x).
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// High exponent on |sin| concentrates brightness
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// into thin bands.
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float warp = warpNoise(static_cast<float>(x),
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static_cast<float>(y));
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float v = std::sin((x + warp * 80.0f) * 0.07f);
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float vein = std::pow(std::abs(v), sharpness);
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uint8_t r = static_cast<uint8_t>(br * (1 - vein) + vr * vein);
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uint8_t g = static_cast<uint8_t>(bg * (1 - vein) + vg * vein);
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uint8_t b = static_cast<uint8_t>(bb_ * (1 - vein) + vb * vein);
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size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
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pixels[i2 + 0] = r;
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pixels[i2 + 1] = g;
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pixels[i2 + 2] = b;
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}
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}
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if (!savePngOrError(outPath, W, H, pixels, "gen-texture-marble")) return 1;
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std::printf("Wrote %s\n", outPath.c_str());
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std::printf(" size : %dx%d\n", W, H);
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std::printf(" base/vein : %s / %s\n",
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baseHex.c_str(), veinHex.c_str());
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std::printf(" sharpness : %.1f\n", sharpness);
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std::printf(" seed : %u\n", seed);
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return 0;
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}
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int handleMetal(int& i, int argc, char** argv) {
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// Brushed-metal pattern. We generate per-pixel white
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// noise then box-blur it heavily along one axis (the
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// brush direction) and lightly along the other. Result:
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// long thin streaks of varying brightness, the visual
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// signature of brushed steel/aluminum/iron. Apply that
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// streaky shade as a multiplicative tint on the base
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// metal color.
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std::string outPath = argv[++i];
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std::string baseHex = argv[++i];
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uint32_t seed = 1;
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std::string orientation = "horizontal";
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int W = 256, H = 256;
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parseOptUint(i, argc, argv, seed);
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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orientation = argv[++i];
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}
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parseOptInt(i, argc, argv, W);
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parseOptInt(i, argc, argv, H);
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if (W < 1 || H < 1 || W > 8192 || H > 8192) {
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std::fprintf(stderr,
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"gen-texture-metal: invalid dims (W/H 1..8192)\n");
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return 1;
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}
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if (orientation != "horizontal" && orientation != "vertical") {
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std::fprintf(stderr,
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"gen-texture-metal: orientation must be horizontal|vertical\n");
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return 1;
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}
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uint8_t mr, mg, mb;
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if (!parseHexOrError(baseHex, mr, mg, mb, "gen-texture-metal")) return 1;
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uint32_t state = seed ? seed : 1u;
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auto next01 = [&state]() -> float {
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state = state * 1664525u + 1013904223u;
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return (state >> 8) * (1.0f / 16777216.0f);
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};
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// Step 1: per-pixel white noise.
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std::vector<float> noise(static_cast<size_t>(W) * H);
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for (auto& v : noise) v = next01();
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// Step 2: directional blur. For horizontal orientation,
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// blur strongly in X (long brush strokes) and lightly
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// in Y (thin variation across strokes). Vertical
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// orientation flips X and Y.
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std::vector<float> blurred(noise.size(), 0.0f);
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int rxLong = (orientation == "horizontal") ? 24 : 2;
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int ryLong = (orientation == "horizontal") ? 2 : 24;
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for (int y = 0; y < H; ++y) {
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for (int x = 0; x < W; ++x) {
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float sum = 0.0f;
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int n = 0;
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for (int dy = -ryLong; dy <= ryLong; ++dy) {
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int py = y + dy;
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if (py < 0 || py >= H) continue;
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for (int dx = -rxLong; dx <= rxLong; ++dx) {
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int px = x + dx;
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if (px < 0 || px >= W) continue;
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sum += noise[static_cast<size_t>(py) * W + px];
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n++;
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}
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}
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blurred[static_cast<size_t>(y) * W + x] = sum / n;
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}
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}
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// Step 3: stretch contrast back out so the streaks
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// are visible (blurring narrows the range).
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float minV = 1.0f, maxV = 0.0f;
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for (float v : blurred) { minV = std::min(minV, v); maxV = std::max(maxV, v); }
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float range = std::max(maxV - minV, 1e-6f);
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std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
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for (int y = 0; y < H; ++y) {
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for (int x = 0; x < W; ++x) {
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float t = (blurred[static_cast<size_t>(y) * W + x] - minV) / range;
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// Map noise to a multiplicative shade in [0.7, 1.1]
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// so the metal looks polished but not flat.
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float shade = 0.7f + t * 0.4f;
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size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
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pixels[i2 + 0] = static_cast<uint8_t>(
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std::clamp(mr * shade, 0.0f, 255.0f));
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pixels[i2 + 1] = static_cast<uint8_t>(
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std::clamp(mg * shade, 0.0f, 255.0f));
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pixels[i2 + 2] = static_cast<uint8_t>(
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std::clamp(mb * shade, 0.0f, 255.0f));
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}
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}
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if (!savePngOrError(outPath, W, H, pixels, "gen-texture-metal")) return 1;
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std::printf("Wrote %s\n", outPath.c_str());
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std::printf(" size : %dx%d\n", W, H);
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std::printf(" base color : %s\n", baseHex.c_str());
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std::printf(" orientation : %s\n", orientation.c_str());
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std::printf(" seed : %u\n", seed);
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return 0;
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}
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int handleLeather(int& i, int argc, char** argv) {
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// Leather grain pattern. Cellular Worley noise where
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// each "pebble" cell darkens at its boundaries with
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// its neighbors — the look of fine-grain leather.
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// Each cell also gets per-cell tint variation so the
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// surface doesn't read as uniform.
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std::string outPath = argv[++i];
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std::string baseHex = argv[++i];
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uint32_t seed = 1;
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int grainSize = 4; // average pebble cell size in px
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int W = 256, H = 256;
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parseOptUint(i, argc, argv, seed);
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parseOptInt(i, argc, argv, grainSize);
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parseOptInt(i, argc, argv, W);
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parseOptInt(i, argc, argv, H);
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if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
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grainSize < 2 || grainSize > 64) {
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std::fprintf(stderr,
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"gen-texture-leather: invalid dims (W/H 1..8192, grainSize 2..64)\n");
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return 1;
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}
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uint8_t lr, lg, lb;
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if (!parseHexOrError(baseHex, lr, lg, lb, "gen-texture-leather")) return 1;
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// Per-cell hash (same idea as cobble, but smaller cells).
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auto hash01 = [seed](int cx, int cy, int comp) -> float {
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uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
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static_cast<uint32_t>(cy) * 668265263u +
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seed * 2147483647u +
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static_cast<uint32_t>(comp) * 16777619u;
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h = (h ^ (h >> 13)) * 1274126177u;
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h = h ^ (h >> 16);
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return (h >> 8) * (1.0f / 16777216.0f);
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};
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std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
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for (int y = 0; y < H; ++y) {
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int cy0 = y / grainSize;
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for (int x = 0; x < W; ++x) {
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int cx0 = x / grainSize;
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float bestD = 1e9f, second = 1e9f;
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int bestCx = 0, bestCy = 0;
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for (int dy = -1; dy <= 1; ++dy) {
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for (int dx = -1; dx <= 1; ++dx) {
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int cx = cx0 + dx;
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int cy = cy0 + dy;
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float jx = (hash01(cx, cy, 0) - 0.5f) * 0.6f;
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float jy = (hash01(cx, cy, 1) - 0.5f) * 0.6f;
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float ccx = (cx + 0.5f + jx) * grainSize;
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float ccy = (cy + 0.5f + jy) * grainSize;
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float dxp = x - ccx, dyp = y - ccy;
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float d = std::sqrt(dxp * dxp + dyp * dyp);
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if (d < bestD) {
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second = bestD;
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bestD = d;
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bestCx = cx;
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bestCy = cy;
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} else if (d < second) {
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second = d;
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}
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}
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}
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// Boundary darkness: closer to the cell border
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// = darker. Scaled by grainSize for resolution
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// independence.
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float boundary = (second - bestD) / grainSize;
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float boundaryShade = std::clamp(boundary * 1.5f, 0.4f, 1.0f);
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// Per-cell tint: ±15% lightness.
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float tint = 0.85f + 0.30f * hash01(bestCx, bestCy, 2);
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float shade = boundaryShade * tint;
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size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
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pixels[i2 + 0] = static_cast<uint8_t>(
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std::clamp(lr * shade, 0.0f, 255.0f));
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pixels[i2 + 1] = static_cast<uint8_t>(
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std::clamp(lg * shade, 0.0f, 255.0f));
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pixels[i2 + 2] = static_cast<uint8_t>(
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std::clamp(lb * shade, 0.0f, 255.0f));
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}
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}
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if (!savePngOrError(outPath, W, H, pixels, "gen-texture-leather")) return 1;
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std::printf("Wrote %s\n", outPath.c_str());
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std::printf(" size : %dx%d\n", W, H);
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std::printf(" base color : %s\n", baseHex.c_str());
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std::printf(" grain size : %d px\n", grainSize);
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std::printf(" seed : %u\n", seed);
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return 0;
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}
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int handleSand(int& i, int argc, char** argv) {
|
||
// Sand dunes pattern: per-pixel salt-and-pepper grain
|
||
// jitter (the individual grains of sand) overlaid with
|
||
// wide sinusoidal ripple bands (the wind-formed dune
|
||
// ridges). Result reads as windswept beach or desert.
|
||
std::string outPath = argv[++i];
|
||
std::string baseHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int rippleSpacing = 24;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, rippleSpacing);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
rippleSpacing < 4 || rippleSpacing > 512) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-sand: invalid dims (W/H 1..8192, rippleSpacing 4..512)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_;
|
||
if (!parseHexOrError(baseHex, br, bg, bb_, "gen-texture-sand")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float pi = 3.14159265358979f;
|
||
float seedF = static_cast<float>(seed);
|
||
// Pre-compute one ripple offset per row so dunes flow
|
||
// smoothly along Y rather than being identical at each row.
|
||
std::vector<float> rowPhase(H, 0.0f);
|
||
for (int y = 0; y < H; ++y) {
|
||
rowPhase[y] = std::sin(y * 0.05f + seedF) * rippleSpacing * 0.5f;
|
||
}
|
||
for (int y = 0; y < H; ++y) {
|
||
float phaseY = rowPhase[y];
|
||
for (int x = 0; x < W; ++x) {
|
||
// Ripple shade: sine band aligned to (x + phaseY).
|
||
float ripple = std::sin((x + phaseY) * 2.0f * pi /
|
||
rippleSpacing);
|
||
float rippleShade = 1.0f + 0.10f * ripple;
|
||
// Per-pixel grain noise: ±5% jitter.
|
||
float grain = (next01() - 0.5f) * 0.10f;
|
||
float shade = rippleShade + grain;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(
|
||
std::clamp(br * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 1] = static_cast<uint8_t>(
|
||
std::clamp(bg * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 2] = static_cast<uint8_t>(
|
||
std::clamp(bb_ * shade, 0.0f, 255.0f));
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-sand")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" base color : %s\n", baseHex.c_str());
|
||
std::printf(" ripple spacing : %d px\n", rippleSpacing);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleSnow(int& i, int argc, char** argv) {
|
||
// Snow texture: cool-white base with very subtle blueish
|
||
// tint variation (the soft uneven luminance of fresh
|
||
// powder), plus scattered single-pixel "sparkles" at
|
||
// bright white where ice crystals catch light.
|
||
std::string outPath = argv[++i];
|
||
std::string baseHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
float density = 0.005f; // fraction of pixels that sparkle
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptFloat(i, argc, argv, density);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
density < 0.0f || density > 0.5f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-snow: invalid dims (W/H 1..8192, density 0..0.5)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_;
|
||
if (!parseHexOrError(baseHex, br, bg, bb_, "gen-texture-snow")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Soft luminance variation via low-frequency cosine
|
||
// sums — gives the surface a gently uneven powdery
|
||
// look rather than a flat field.
|
||
float seedF = static_cast<float>(seed);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float wave = std::cos(x * 0.03f + seedF) *
|
||
std::cos(y * 0.04f + seedF * 0.7f);
|
||
float jitter = (next01() - 0.5f) * 0.04f;
|
||
float shade = 1.0f + 0.05f * wave + jitter;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(
|
||
std::clamp(br * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 1] = static_cast<uint8_t>(
|
||
std::clamp(bg * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 2] = static_cast<uint8_t>(
|
||
std::clamp(bb_ * shade, 0.0f, 255.0f));
|
||
}
|
||
}
|
||
// Sparkle pass: scatter bright single-pixel highlights.
|
||
int sparkles = static_cast<int>(W * H * density);
|
||
for (int s = 0; s < sparkles; ++s) {
|
||
int sx = static_cast<int>(next01() * W);
|
||
int sy = static_cast<int>(next01() * H);
|
||
size_t i2 = (static_cast<size_t>(sy) * W + sx) * 3;
|
||
pixels[i2 + 0] = 255;
|
||
pixels[i2 + 1] = 255;
|
||
pixels[i2 + 2] = 255;
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-snow")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" base color : %s\n", baseHex.c_str());
|
||
std::printf(" density : %.4f (%d sparkles)\n",
|
||
density, sparkles);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleLava(int& i, int argc, char** argv) {
|
||
// Lava texture: dark cooled-crust base with bright
|
||
// glowing cracks tracing Worley cell boundaries — the
|
||
// canonical "broken obsidian shell over magma" look.
|
||
// Same cellular noise structure as gen-texture-cobble
|
||
// but the boundary regions glow hot instead of darken.
|
||
std::string outPath = argv[++i];
|
||
std::string darkHex = argv[++i];
|
||
std::string hotHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int crackScale = 32; // average cell size in px
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, crackScale);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
crackScale < 8 || crackScale > 512) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-lava: invalid dims (W/H 1..8192, crackScale 8..512)\n");
|
||
return 1;
|
||
}
|
||
uint8_t dr, dg, db, hr, hg, hb;
|
||
if (!parseHexOrError(darkHex, dr, dg, db, "gen-texture-lava")) return 1;
|
||
if (!parseHexOrError(hotHex, hr, hg, hb, "gen-texture-lava")) return 1;
|
||
auto hash01 = [seed](int cx, int cy, int comp) -> float {
|
||
uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
|
||
static_cast<uint32_t>(cy) * 668265263u +
|
||
seed * 2147483647u +
|
||
static_cast<uint32_t>(comp) * 16777619u;
|
||
h = (h ^ (h >> 13)) * 1274126177u;
|
||
h = h ^ (h >> 16);
|
||
return (h >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int cy0 = y / crackScale;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx0 = x / crackScale;
|
||
float bestD = 1e9f, second = 1e9f;
|
||
for (int dy = -1; dy <= 1; ++dy) {
|
||
for (int dx = -1; dx <= 1; ++dx) {
|
||
int cx = cx0 + dx;
|
||
int cy = cy0 + dy;
|
||
float jx = (hash01(cx, cy, 0) - 0.5f) * 0.7f;
|
||
float jy = (hash01(cx, cy, 1) - 0.5f) * 0.7f;
|
||
float ccx = (cx + 0.5f + jx) * crackScale;
|
||
float ccy = (cy + 0.5f + jy) * crackScale;
|
||
float dxp = x - ccx, dyp = y - ccy;
|
||
float d = std::sqrt(dxp * dxp + dyp * dyp);
|
||
if (d < bestD) { second = bestD; bestD = d; }
|
||
else if (d < second) { second = d; }
|
||
}
|
||
}
|
||
// Boundary intensity: thin glow band where the
|
||
// distance to the second-closest center is
|
||
// close to the distance to the closest. Glow
|
||
// strength falls off as we move away from the
|
||
// crack into the cell interior.
|
||
float boundary = (second - bestD) / crackScale;
|
||
float crackWidth = 0.08f;
|
||
float glow = 0.0f;
|
||
if (boundary < crackWidth) {
|
||
// Inside the crack — bright hot color.
|
||
glow = 1.0f - boundary / crackWidth;
|
||
} else if (boundary < crackWidth * 4.0f) {
|
||
// Penumbra: soft glow falling off into crust.
|
||
glow = 0.3f * (1.0f - (boundary - crackWidth) /
|
||
(crackWidth * 3.0f));
|
||
}
|
||
glow = std::clamp(glow, 0.0f, 1.0f);
|
||
uint8_t r = static_cast<uint8_t>(dr * (1 - glow) + hr * glow);
|
||
uint8_t g = static_cast<uint8_t>(dg * (1 - glow) + hg * glow);
|
||
uint8_t b = static_cast<uint8_t>(db * (1 - glow) + hb * glow);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-lava")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" dark/hot : %s / %s\n",
|
||
darkHex.c_str(), hotHex.c_str());
|
||
std::printf(" crack scale : %d px\n", crackScale);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
|
||
int handleGradient(int& i, int argc, char** argv) {
|
||
// Linear two-color gradient. Useful for sky strips, UI
|
||
// fills, glow rings, dirt-on-grass terrain blends — the
|
||
// common "fade" cases that --gen-texture's solid/checker/
|
||
// grid don't cover.
|
||
//
|
||
// Direction: "vertical" (top→bottom, default) or
|
||
// "horizontal" (left→right). Colors are hex like
|
||
// --gen-texture.
|
||
std::string outPath = argv[++i];
|
||
std::string fromHex = argv[++i];
|
||
std::string toHex = argv[++i];
|
||
bool horizontal = false;
|
||
int W = 256, H = 256;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
std::string dir = argv[i + 1];
|
||
std::transform(dir.begin(), dir.end(), dir.begin(),
|
||
[](unsigned char c) { return std::tolower(c); });
|
||
if (dir == "horizontal" || dir == "vertical") {
|
||
horizontal = (dir == "horizontal");
|
||
i++;
|
||
}
|
||
}
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-gradient: invalid size %dx%d (1..8192)\n",
|
||
W, H);
|
||
return 1;
|
||
}
|
||
// Hex parser: shared local helper for both endpoints. Same
|
||
// RRGGBB / RGB rules as --gen-texture.
|
||
uint8_t r0, g0, b0, r1, g1, b1;
|
||
if (!parseHexOrError(fromHex, r0, g0, b0, "gen-texture-gradient")) return 1;
|
||
if (!parseHexOrError(toHex, r1, g1, b1, "gen-texture-gradient")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float t;
|
||
if (horizontal) {
|
||
t = (W <= 1) ? 0.0f : float(x) / float(W - 1);
|
||
} else {
|
||
t = (H <= 1) ? 0.0f : float(y) / float(H - 1);
|
||
}
|
||
auto lerp = [](uint8_t a, uint8_t b, float t) {
|
||
return static_cast<uint8_t>(a + (b - a) * t + 0.5f);
|
||
};
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = lerp(r0, r1, t);
|
||
pixels[i2 + 1] = lerp(g0, g1, t);
|
||
pixels[i2 + 2] = lerp(b0, b1, t);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-gradient")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" direction : %s\n",
|
||
horizontal ? "horizontal" : "vertical");
|
||
std::printf(" from : %s (rgb %u,%u,%u)\n",
|
||
fromHex.c_str(), r0, g0, b0);
|
||
std::printf(" to : %s (rgb %u,%u,%u)\n",
|
||
toHex.c_str(), r1, g1, b1);
|
||
return 0;
|
||
}
|
||
|
||
int handleNoise(int& i, int argc, char** argv) {
|
||
// Smooth value-noise PNG. Useful for terrain detail
|
||
// overlays, dirt/grass blends, magic-fog backdrops —
|
||
// anywhere a "natural-looking" pseudo-random texture
|
||
// beats a flat color or grid.
|
||
//
|
||
// Algorithm: bilinearly-interpolated 16×16 random lattice
|
||
// sampled per pixel. Cheaper than perlin and produces a
|
||
// similar visual signal at this resolution.
|
||
//
|
||
// Deterministic from the integer seed so CI runs and
|
||
// re-runs are reproducible. Output is grayscale
|
||
// (R==G==B per pixel) so users can tint it externally.
|
||
std::string outPath = argv[++i];
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); }
|
||
catch (...) {}
|
||
}
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise: invalid size %dx%d (1..8192)\n",
|
||
W, H);
|
||
return 1;
|
||
}
|
||
// Tiny LCG (numerical recipes constants) so noise is
|
||
// dependency-free and bit-for-bit identical across
|
||
// platforms.
|
||
const int latticeSize = 17; // 16 cells × bilinear corners
|
||
std::vector<float> lattice(latticeSize * latticeSize);
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next = [&]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) / float(1 << 24);
|
||
};
|
||
for (auto& v : lattice) v = next();
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
float fy = static_cast<float>(y) / H * (latticeSize - 1);
|
||
int yi = static_cast<int>(fy);
|
||
if (yi >= latticeSize - 1) yi = latticeSize - 2;
|
||
float fty = fy - yi;
|
||
// Smoothstep so cell boundaries don't show as bands.
|
||
float ty = fty * fty * (3.0f - 2.0f * fty);
|
||
for (int x = 0; x < W; ++x) {
|
||
float fx = static_cast<float>(x) / W * (latticeSize - 1);
|
||
int xi = static_cast<int>(fx);
|
||
if (xi >= latticeSize - 1) xi = latticeSize - 2;
|
||
float ftx = fx - xi;
|
||
float tx = ftx * ftx * (3.0f - 2.0f * ftx);
|
||
float a = lattice[yi * latticeSize + xi];
|
||
float b = lattice[yi * latticeSize + xi + 1];
|
||
float c = lattice[(yi + 1) * latticeSize + xi];
|
||
float d = lattice[(yi + 1) * latticeSize + xi + 1];
|
||
float ab = a + (b - a) * tx;
|
||
float cd = c + (d - c) * tx;
|
||
float v = ab + (cd - ab) * ty;
|
||
uint8_t g = static_cast<uint8_t>(v * 255.0f + 0.5f);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = g;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = g;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-noise")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" seed : %u\n", seed);
|
||
std::printf(" type : smooth value noise (16x16 bilinear lattice)\n");
|
||
return 0;
|
||
}
|
||
|
||
int handleNoiseColor(int& i, int argc, char** argv) {
|
||
// Two-color noise blend: same value-noise function as
|
||
// --gen-texture-noise but interpolated between two RGB
|
||
// endpoints rather than emitted as grayscale. Useful
|
||
// for terrain detail (grass+dirt mottle), magic fog,
|
||
// marble veining, or any "natural variation" pass that
|
||
// shouldn't be desaturated.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); }
|
||
catch (...) {}
|
||
}
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise-color: invalid size %dx%d\n", W, H);
|
||
return 1;
|
||
}
|
||
uint8_t ra, ga, ba, rb, gb, bb;
|
||
if (!parseHexOrError(aHex, ra, ga, ba, "gen-texture-noise-color")) return 1;
|
||
if (!parseHexOrError(bHex, rb, gb, bb, "gen-texture-noise-color")) return 1;
|
||
// Same noise pipeline as --gen-texture-noise.
|
||
const int latticeSize = 17;
|
||
std::vector<float> lattice(latticeSize * latticeSize);
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next = [&]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) / float(1 << 24);
|
||
};
|
||
for (auto& v : lattice) v = next();
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
float fy = static_cast<float>(y) / H * (latticeSize - 1);
|
||
int yi = static_cast<int>(fy);
|
||
if (yi >= latticeSize - 1) yi = latticeSize - 2;
|
||
float fty = fy - yi;
|
||
float ty = fty * fty * (3.0f - 2.0f * fty);
|
||
for (int x = 0; x < W; ++x) {
|
||
float fx = static_cast<float>(x) / W * (latticeSize - 1);
|
||
int xi = static_cast<int>(fx);
|
||
if (xi >= latticeSize - 1) xi = latticeSize - 2;
|
||
float ftx = fx - xi;
|
||
float tx = ftx * ftx * (3.0f - 2.0f * ftx);
|
||
float a = lattice[yi * latticeSize + xi];
|
||
float b = lattice[yi * latticeSize + xi + 1];
|
||
float c = lattice[(yi + 1) * latticeSize + xi];
|
||
float d = lattice[(yi + 1) * latticeSize + xi + 1];
|
||
float ab = a + (b - a) * tx;
|
||
float cd = c + (d - c) * tx;
|
||
float v = ab + (cd - ab) * ty;
|
||
auto lerp = [](uint8_t lo, uint8_t hi, float t) {
|
||
return static_cast<uint8_t>(lo + (hi - lo) * t + 0.5f);
|
||
};
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = lerp(ra, rb, v);
|
||
pixels[i2 + 1] = lerp(ga, gb, v);
|
||
pixels[i2 + 2] = lerp(ba, bb, v);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-noise-color")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" seed : %u\n", seed);
|
||
std::printf(" from : %s\n", aHex.c_str());
|
||
std::printf(" to : %s\n", bHex.c_str());
|
||
return 0;
|
||
}
|
||
|
||
int handleRadial(int& i, int argc, char** argv) {
|
||
// Radial gradient: centerHex at the image center fading
|
||
// smoothly to edgeHex at the corner. Useful for spell
|
||
// glow rings, vignettes, soft-edged decals — the
|
||
// common "circular blob" cases that linear gradients
|
||
// can't produce.
|
||
//
|
||
// Distance is normalized so the corner is t=1 (image is
|
||
// not necessarily square). A smoothstep curve gives a
|
||
// soft falloff rather than a harsh disc edge.
|
||
std::string outPath = argv[++i];
|
||
std::string centerHex = argv[++i];
|
||
std::string edgeHex = argv[++i];
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-radial: invalid size %dx%d (1..8192)\n",
|
||
W, H);
|
||
return 1;
|
||
}
|
||
uint8_t rc, gc, bc, re, ge, be;
|
||
if (!parseHexOrError(centerHex, rc, gc, bc, "gen-texture-radial")) return 1;
|
||
if (!parseHexOrError(edgeHex, re, ge, be, "gen-texture-radial")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
float cx = (W - 1) * 0.5f;
|
||
float cy = (H - 1) * 0.5f;
|
||
// Max distance is the corner (cx, cy itself = half-diag).
|
||
float maxD = std::sqrt(cx * cx + cy * cy);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float d = std::sqrt(dx * dx + dy * dy);
|
||
float t = (maxD > 0) ? (d / maxD) : 0.0f;
|
||
if (t > 1.0f) t = 1.0f;
|
||
// Smoothstep so the falloff is soft.
|
||
float smt = t * t * (3.0f - 2.0f * t);
|
||
auto lerp = [](uint8_t a, uint8_t b, float t) {
|
||
return static_cast<uint8_t>(a + (b - a) * t + 0.5f);
|
||
};
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = lerp(rc, re, smt);
|
||
pixels[i2 + 1] = lerp(gc, ge, smt);
|
||
pixels[i2 + 2] = lerp(bc, be, smt);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-radial")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" center : %s (rgb %u,%u,%u)\n",
|
||
centerHex.c_str(), rc, gc, bc);
|
||
std::printf(" edge : %s (rgb %u,%u,%u)\n",
|
||
edgeHex.c_str(), re, ge, be);
|
||
return 0;
|
||
}
|
||
|
||
int handleStripes(int& i, int argc, char** argv) {
|
||
// Two-color stripe pattern. Stripe width in pixels, plus
|
||
// direction (diagonal default, or horizontal/vertical).
|
||
// Useful for caution tape, marble bands, hazard markers,
|
||
// and racing-style start/finish flags — patterns that
|
||
// checker/grid don't capture.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
int stripePx = 16;
|
||
std::string dir = "diagonal";
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stripePx);
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
std::string d = argv[i + 1];
|
||
std::transform(d.begin(), d.end(), d.begin(),
|
||
[](unsigned char c) { return std::tolower(c); });
|
||
if (d == "diagonal" || d == "horizontal" || d == "vertical") {
|
||
dir = d;
|
||
i++;
|
||
}
|
||
}
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stripePx < 1 || stripePx > 4096) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stripes: invalid dims (W/H 1..8192, stripe 1..4096)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ra, ga, ba, rb, gb, bb;
|
||
if (!parseHexOrError(aHex, ra, ga, ba, "gen-texture-stripes")) return 1;
|
||
if (!parseHexOrError(bHex, rb, gb, bb, "gen-texture-stripes")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
int proj;
|
||
if (dir == "horizontal") proj = y;
|
||
else if (dir == "vertical") proj = x;
|
||
else proj = x + y;
|
||
bool isA = ((proj / stripePx) & 1) == 0;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = isA ? ra : rb;
|
||
pixels[i2 + 1] = isA ? ga : gb;
|
||
pixels[i2 + 2] = isA ? ba : bb;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-stripes")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" direction : %s\n", dir.c_str());
|
||
std::printf(" stripe : %d px\n", stripePx);
|
||
std::printf(" colors : %s + %s\n", aHex.c_str(), bHex.c_str());
|
||
return 0;
|
||
}
|
||
|
||
int handleDots(int& i, int argc, char** argv) {
|
||
// Polka-dot pattern: solid background with circular dots
|
||
// on a regular grid. Useful for fabric/clothing textures,
|
||
// game-board patterns, or quick decorative tiling.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string dotHex = argv[++i];
|
||
int radius = 8, spacing = 32;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, radius);
|
||
parseOptInt(i, argc, argv, spacing);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
radius < 1 || radius > 1024 ||
|
||
spacing < 2 || spacing > 4096) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-dots: invalid dims (W/H 1..8192, radius 1..1024, spacing 2..4096)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb, dr, dg, db;
|
||
if (!parseHexOrError(bgHex, br, bg, bb, "gen-texture-dots")) return 1;
|
||
if (!parseHexOrError(dotHex, dr, dg, db, "gen-texture-dots")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
float r2 = static_cast<float>(radius) * radius;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Distance to the nearest grid point.
|
||
int gx = (x + spacing / 2) / spacing * spacing;
|
||
int gy = (y + spacing / 2) / spacing * spacing;
|
||
float dx = static_cast<float>(x - gx);
|
||
float dy = static_cast<float>(y - gy);
|
||
bool inDot = (dx * dx + dy * dy) < r2;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = inDot ? dr : br;
|
||
pixels[i2 + 1] = inDot ? dg : bg;
|
||
pixels[i2 + 2] = inDot ? db : bb;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-dots")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg : %s\n", bgHex.c_str());
|
||
std::printf(" dot : %s\n", dotHex.c_str());
|
||
std::printf(" radius : %d px\n", radius);
|
||
std::printf(" spacing : %d px\n", spacing);
|
||
return 0;
|
||
}
|
||
|
||
int handleRings(int& i, int argc, char** argv) {
|
||
// Concentric rings centered on the image. Useful for
|
||
// archery targets, magic seal floors, dartboards, hypnosis
|
||
// visuals — anywhere a "circular alternation" reads as
|
||
// intentional design.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
int ringPx = 16;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, ringPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
ringPx < 1 || ringPx > 4096) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rings: invalid dims (W/H 1..8192, ringPx 1..4096)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ra, ga, ba, rb, gb, bb;
|
||
if (!parseHexOrError(aHex, ra, ga, ba, "gen-texture-rings")) return 1;
|
||
if (!parseHexOrError(bHex, rb, gb, bb, "gen-texture-rings")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
float cx = (W - 1) * 0.5f;
|
||
float cy = (H - 1) * 0.5f;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float d = std::sqrt(dx * dx + dy * dy);
|
||
bool isA = (static_cast<int>(d / ringPx) & 1) == 0;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = isA ? ra : rb;
|
||
pixels[i2 + 1] = isA ? ga : gb;
|
||
pixels[i2 + 2] = isA ? ba : bb;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-rings")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" ring px : %d\n", ringPx);
|
||
std::printf(" colors : %s + %s\n", aHex.c_str(), bHex.c_str());
|
||
return 0;
|
||
}
|
||
|
||
int handleChecker(int& i, int argc, char** argv) {
|
||
// Two-color checkerboard with custom colors. The
|
||
// existing --gen-texture's "checker" pattern is fixed
|
||
// black/white at 32px; this is the configurable variant
|
||
// for game boards, kitchen floors, hazard markers in
|
||
// colors other than monochrome.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
int cellPx = 32;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellPx < 1 || cellPx > 4096) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-checker: invalid dims (W/H 1..8192, cellPx 1..4096)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ra, ga, ba, rb, gb, bb;
|
||
if (!parseHexOrError(aHex, ra, ga, ba, "gen-texture-checker")) return 1;
|
||
if (!parseHexOrError(bHex, rb, gb, bb, "gen-texture-checker")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
bool isA = ((x / cellPx) + (y / cellPx)) % 2 == 0;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = isA ? ra : rb;
|
||
pixels[i2 + 1] = isA ? ga : gb;
|
||
pixels[i2 + 2] = isA ? ba : bb;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-checker")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" cell px : %d\n", cellPx);
|
||
std::printf(" colors : %s + %s\n", aHex.c_str(), bHex.c_str());
|
||
return 0;
|
||
}
|
||
|
||
int handleBrick(int& i, int argc, char** argv) {
|
||
// Brick wall pattern: rectangular bricks with offset rows
|
||
// (each row shifted by half a brick width) and mortar
|
||
// lines between. Useful for walls, chimneys, paths,
|
||
// medieval-zone props.
|
||
std::string outPath = argv[++i];
|
||
std::string brickHex = argv[++i];
|
||
std::string mortarHex = argv[++i];
|
||
int brickW = 64, brickH = 24, mortarPx = 4;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, brickW);
|
||
parseOptInt(i, argc, argv, brickH);
|
||
parseOptInt(i, argc, argv, mortarPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
brickW < 4 || brickW > 4096 ||
|
||
brickH < 4 || brickH > 4096 ||
|
||
mortarPx < 0 || mortarPx > brickH / 2) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-brick: invalid dims (W/H 1..8192, brick 4..4096, mortar < brickH/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_, mr, mg, mb;
|
||
if (!parseHexOrError(brickHex, br, bg, bb_, "gen-texture-brick")) return 1;
|
||
if (!parseHexOrError(mortarHex, mr, mg, mb, "gen-texture-brick")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
int rowH = brickH; // total row height (brick + mortar)
|
||
int halfBrick = brickW / 2;
|
||
for (int y = 0; y < H; ++y) {
|
||
int row = y / rowH;
|
||
int yInRow = y % rowH;
|
||
bool inMortarH = (yInRow < mortarPx);
|
||
int xOffset = (row & 1) ? halfBrick : 0;
|
||
for (int x = 0; x < W; ++x) {
|
||
int xS = (x + xOffset) % brickW;
|
||
bool inMortarV = (xS < mortarPx);
|
||
bool isMortar = inMortarH || inMortarV;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = isMortar ? mr : br;
|
||
pixels[i2 + 1] = isMortar ? mg : bg;
|
||
pixels[i2 + 2] = isMortar ? mb : bb_;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-brick")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" brick : %d × %d px (%s)\n",
|
||
brickW, brickH, brickHex.c_str());
|
||
std::printf(" mortar : %d px (%s)\n",
|
||
mortarPx, mortarHex.c_str());
|
||
return 0;
|
||
}
|
||
|
||
int handleWood(int& i, int argc, char** argv) {
|
||
// Wood grain pattern: vertical streaks of varying width
|
||
// alternating between light and dark hues, plus a few
|
||
// pseudo-random "knots" (small dark dots). Suitable for
|
||
// doors, planks, fences, crates.
|
||
std::string outPath = argv[++i];
|
||
std::string lightHex = argv[++i];
|
||
std::string darkHex = argv[++i];
|
||
int spacing = 12; // average grain spacing in px
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, spacing);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
spacing < 2 || spacing > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-wood: invalid dims (W/H 1..8192, spacing 2..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t lr, lg, lb, dr, dg, db;
|
||
if (!parseHexOrError(lightHex, lr, lg, lb, "gen-texture-wood")) return 1;
|
||
if (!parseHexOrError(darkHex, dr, dg, db, "gen-texture-wood")) return 1;
|
||
// Tiny LCG so output is reproducible from `seed` alone
|
||
// without pulling in <random>.
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
// Pre-compute per-column "darkness" weight by accumulating
|
||
// grain bands of varying width across the image. A band's
|
||
// weight bleeds into a few neighbors so transitions feel
|
||
// soft rather than blocky.
|
||
std::vector<float> colWeight(W, 0.0f);
|
||
int x = 0;
|
||
while (x < W) {
|
||
int width = spacing + static_cast<int>(next01() * spacing);
|
||
float weight = next01(); // 0..1
|
||
int feather = std::max(1, width / 6);
|
||
for (int dx = -feather; dx < width + feather; ++dx) {
|
||
int cx = x + dx;
|
||
if (cx < 0 || cx >= W) continue;
|
||
float t = 1.0f;
|
||
if (dx < 0) t = 1.0f + dx / static_cast<float>(feather);
|
||
else if (dx >= width) t = 1.0f - (dx - width) / static_cast<float>(feather);
|
||
colWeight[cx] = std::max(colWeight[cx], weight * t);
|
||
}
|
||
x += width;
|
||
}
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
// Slight Y-axis warp so streaks aren't perfectly straight
|
||
float yWave = std::sin(y * 0.025f) * 1.5f;
|
||
for (int xi = 0; xi < W; ++xi) {
|
||
int sx = xi + static_cast<int>(yWave);
|
||
if (sx < 0) sx = 0;
|
||
if (sx >= W) sx = W - 1;
|
||
float w = colWeight[sx];
|
||
uint8_t r = static_cast<uint8_t>(lr * (1 - w) + dr * w);
|
||
uint8_t g = static_cast<uint8_t>(lg * (1 - w) + dg * w);
|
||
uint8_t b = static_cast<uint8_t>(lb * (1 - w) + db * w);
|
||
size_t i2 = (static_cast<size_t>(y) * W + xi) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
// Sprinkle a handful of round "knots" using the same LCG.
|
||
int knotCount = std::max(1, (W * H) / 32768);
|
||
for (int k = 0; k < knotCount; ++k) {
|
||
int kx = static_cast<int>(next01() * W);
|
||
int ky = static_cast<int>(next01() * H);
|
||
int radius = 3 + static_cast<int>(next01() * 4);
|
||
for (int dy = -radius; dy <= radius; ++dy) {
|
||
for (int dx = -radius; dx <= radius; ++dx) {
|
||
int px = kx + dx, py = ky + dy;
|
||
if (px < 0 || py < 0 || px >= W || py >= H) continue;
|
||
float d = std::sqrt(static_cast<float>(dx * dx + dy * dy));
|
||
if (d > radius) continue;
|
||
float t = 1.0f - d / radius;
|
||
size_t i2 = (static_cast<size_t>(py) * W + px) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(pixels[i2 + 0] * (1 - t) + dr * t);
|
||
pixels[i2 + 1] = static_cast<uint8_t>(pixels[i2 + 1] * (1 - t) + dg * t);
|
||
pixels[i2 + 2] = static_cast<uint8_t>(pixels[i2 + 2] * (1 - t) + db * t);
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-wood")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" light/dark: %s / %s\n",
|
||
lightHex.c_str(), darkHex.c_str());
|
||
std::printf(" spacing : %d px\n", spacing);
|
||
std::printf(" knots : %d\n", knotCount);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleGrass(int& i, int argc, char** argv) {
|
||
// Tiling grass texture. Starts from a slightly perturbed
|
||
// base color (per-pixel jitter so the field doesn't read
|
||
// as flat), then sprinkles short blade highlights using
|
||
// the brighter blade color. Density controls roughly
|
||
// what fraction of pixels get touched by a blade.
|
||
std::string outPath = argv[++i];
|
||
std::string baseHex = argv[++i];
|
||
std::string bladeHex = argv[++i];
|
||
float density = 0.15f;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptFloat(i, argc, argv, density);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
density < 0.0f || density > 1.0f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-grass: invalid dims (W/H 1..8192, density 0..1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_, gr, gg, gb;
|
||
if (!parseHexOrError(baseHex, br, bg, bb_, "gen-texture-grass")) return 1;
|
||
if (!parseHexOrError(bladeHex, gr, gg, gb, "gen-texture-grass")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Base layer: per-pixel jitter ±10 around the base color.
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int xi = 0; xi < W; ++xi) {
|
||
float j = (next01() - 0.5f) * 20.0f;
|
||
int r = std::clamp(static_cast<int>(br) + static_cast<int>(j), 0, 255);
|
||
int g = std::clamp(static_cast<int>(bg) + static_cast<int>(j), 0, 255);
|
||
int b = std::clamp(static_cast<int>(bb_) + static_cast<int>(j), 0, 255);
|
||
size_t i2 = (static_cast<size_t>(y) * W + xi) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(r);
|
||
pixels[i2 + 1] = static_cast<uint8_t>(g);
|
||
pixels[i2 + 2] = static_cast<uint8_t>(b);
|
||
}
|
||
}
|
||
// Blades: short vertical strokes at random positions.
|
||
// Stroke length 2-5px, alpha-blended toward bladeHex.
|
||
int strokeCount = static_cast<int>(W * H * density * 0.05f);
|
||
for (int s = 0; s < strokeCount; ++s) {
|
||
int sx = static_cast<int>(next01() * W);
|
||
int sy = static_cast<int>(next01() * H);
|
||
int slen = 2 + static_cast<int>(next01() * 4);
|
||
float t = 0.4f + next01() * 0.4f; // blade strength
|
||
for (int dy = 0; dy < slen; ++dy) {
|
||
int py = (sy + dy) % H; // wrap so texture tiles
|
||
int px = sx;
|
||
size_t i2 = (static_cast<size_t>(py) * W + px) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(pixels[i2 + 0] * (1 - t) + gr * t);
|
||
pixels[i2 + 1] = static_cast<uint8_t>(pixels[i2 + 1] * (1 - t) + gg * t);
|
||
pixels[i2 + 2] = static_cast<uint8_t>(pixels[i2 + 2] * (1 - t) + gb * t);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-grass")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" base/blade: %s / %s\n",
|
||
baseHex.c_str(), bladeHex.c_str());
|
||
std::printf(" density : %.3f\n", density);
|
||
std::printf(" blades : %d\n", strokeCount);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleFabric(int& i, int argc, char** argv) {
|
||
// Woven fabric pattern. We model an over/under weave: each
|
||
// "cell" of size threadPx × threadPx is alternately a warp
|
||
// (vertical) thread or a weft (horizontal) thread. Within
|
||
// a thread, brightness shades from edge to center so the
|
||
// weave reads as 3D yarn rather than flat checkerboard.
|
||
std::string outPath = argv[++i];
|
||
std::string warpHex = argv[++i];
|
||
std::string weftHex = argv[++i];
|
||
int threadPx = 4;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, threadPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
threadPx < 2 || threadPx > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-fabric: invalid dims (W/H 1..8192, threadPx 2..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t wr, wg, wb, fr, fg, fb;
|
||
if (!parseHexOrError(warpHex, wr, wg, wb, "gen-texture-fabric")) return 1;
|
||
if (!parseHexOrError(weftHex, fr, fg, fb, "gen-texture-fabric")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int cy = y / threadPx;
|
||
int yInCell = y % threadPx;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx = x / threadPx;
|
||
int xInCell = x % threadPx;
|
||
// Plain weave: alternate warp/weft per cell on
|
||
// a checkerboard. Warp threads run vertically
|
||
// (so we shade across xInCell), weft threads
|
||
// run horizontally (shade across yInCell).
|
||
bool isWarp = ((cx + cy) & 1) == 0;
|
||
int across = isWarp ? xInCell : yInCell;
|
||
float t = static_cast<float>(across) / (threadPx - 1);
|
||
// Center is brighter, edges darker — gives the
|
||
// illusion of a rounded yarn cross-section.
|
||
float shade = 1.0f - 0.4f * std::abs(t - 0.5f) * 2.0f;
|
||
uint8_t r = isWarp ? static_cast<uint8_t>(wr * shade)
|
||
: static_cast<uint8_t>(fr * shade);
|
||
uint8_t g = isWarp ? static_cast<uint8_t>(wg * shade)
|
||
: static_cast<uint8_t>(fg * shade);
|
||
uint8_t b = isWarp ? static_cast<uint8_t>(wb * shade)
|
||
: static_cast<uint8_t>(fb * shade);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-fabric")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" warp/weft : %s / %s\n",
|
||
warpHex.c_str(), weftHex.c_str());
|
||
std::printf(" thread px : %d\n", threadPx);
|
||
return 0;
|
||
}
|
||
|
||
int handleTile(int& i, int argc, char** argv) {
|
||
// Square stone tile pattern: each cell is one tile face,
|
||
// separated by grout lines on every grid edge. Tiles get
|
||
// small per-tile shade jitter so the surface doesn't read
|
||
// as a flat regular grid; grout is the constant separator
|
||
// color. Floors, plaza paving, dungeon walls.
|
||
std::string outPath = argv[++i];
|
||
std::string tileHex = argv[++i];
|
||
std::string groutHex = argv[++i];
|
||
int tilePx = 32;
|
||
int groutPx = 2;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, tilePx);
|
||
parseOptInt(i, argc, argv, groutPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
tilePx < 4 || tilePx > 1024 ||
|
||
groutPx < 0 || groutPx > tilePx / 2) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-tile: invalid dims (W/H 1..8192, tile 4..1024, grout < tile/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t tr, tg, tb, gr, gg, gb;
|
||
if (!parseHexOrError(tileHex, tr, tg, tb, "gen-texture-tile")) return 1;
|
||
if (!parseHexOrError(groutHex, gr, gg, gb, "gen-texture-tile")) return 1;
|
||
// Per-tile shade jitter. Hash the integer cell coords for
|
||
// a stable shade per tile so adjacent tiles look distinct.
|
||
auto cellShade = [](int cx, int cy) -> float {
|
||
uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
|
||
static_cast<uint32_t>(cy) * 668265263u;
|
||
h = (h ^ (h >> 13)) * 1274126177u;
|
||
h = h ^ (h >> 16);
|
||
float n = (h >> 8) * (1.0f / 16777216.0f); // 0..1
|
||
return 0.92f + 0.16f * n; // 0.92..1.08
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int cy = y / tilePx;
|
||
int yInCell = y % tilePx;
|
||
bool yGrout = (yInCell < groutPx);
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx = x / tilePx;
|
||
int xInCell = x % tilePx;
|
||
bool xGrout = (xInCell < groutPx);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
if (xGrout || yGrout) {
|
||
pixels[i2 + 0] = gr;
|
||
pixels[i2 + 1] = gg;
|
||
pixels[i2 + 2] = gb;
|
||
} else {
|
||
float shade = cellShade(cx, cy);
|
||
pixels[i2 + 0] = static_cast<uint8_t>(
|
||
std::clamp(tr * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 1] = static_cast<uint8_t>(
|
||
std::clamp(tg * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 2] = static_cast<uint8_t>(
|
||
std::clamp(tb * shade, 0.0f, 255.0f));
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-tile")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" tile/grout : %s / %s\n",
|
||
tileHex.c_str(), groutHex.c_str());
|
||
std::printf(" tile px : %d\n", tilePx);
|
||
std::printf(" grout px : %d\n", groutPx);
|
||
return 0;
|
||
}
|
||
|
||
int handleBark(int& i, int argc, char** argv) {
|
||
// Tree bark: vertical wavy streaks (the trunk's growth lines)
|
||
// plus dark vertical cracks at random columns (where bark
|
||
// splits as the tree expands). Streaks waver per row via a
|
||
// smooth cosine offset so the texture doesn't look gridded.
|
||
std::string outPath = argv[++i];
|
||
std::string baseHex = argv[++i];
|
||
std::string crackHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
float density = 0.04f; // fraction of columns that become cracks
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptFloat(i, argc, argv, density);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
density < 0.0f || density > 0.5f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bark: invalid dims (W/H 1..8192, density 0..0.5)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_, cr, cg, cb;
|
||
if (!parseHexOrError(baseHex, br, bg, bb_, "gen-texture-bark")) return 1;
|
||
if (!parseHexOrError(crackHex, cr, cg, cb, "gen-texture-bark")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
// Pick crack columns up front (sparse).
|
||
int crackCount = static_cast<int>(W * density);
|
||
std::vector<int> crackCols;
|
||
crackCols.reserve(crackCount);
|
||
for (int k = 0; k < crackCount; ++k) {
|
||
crackCols.push_back(static_cast<int>(next01() * W));
|
||
}
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
float seedF = static_cast<float>(seed);
|
||
// Per-column shade variation (each vertical streak has its own
|
||
// brightness derived from a column hash). Pre-compute so each
|
||
// pixel just reads the column.
|
||
std::vector<float> colShade(W);
|
||
for (int x = 0; x < W; ++x) {
|
||
// Stable column hash → 0.85..1.10 shade
|
||
uint32_t h = static_cast<uint32_t>(x) * 2654435761u + seed;
|
||
h = (h ^ (h >> 13)) * 1274126177u;
|
||
h = h ^ (h >> 16);
|
||
float n = (h >> 8) * (1.0f / 16777216.0f);
|
||
colShade[x] = 0.85f + 0.25f * n;
|
||
}
|
||
for (int y = 0; y < H; ++y) {
|
||
// Slow horizontal sway so vertical streaks waver per row.
|
||
float sway = std::sin(y * 0.04f + seedF * 0.3f) * 1.5f;
|
||
for (int x = 0; x < W; ++x) {
|
||
int sx = x + static_cast<int>(sway);
|
||
if (sx < 0) sx = 0;
|
||
if (sx >= W) sx = W - 1;
|
||
float shade = colShade[sx];
|
||
uint8_t r = static_cast<uint8_t>(std::clamp(br * shade, 0.0f, 255.0f));
|
||
uint8_t g = static_cast<uint8_t>(std::clamp(bg * shade, 0.0f, 255.0f));
|
||
uint8_t b = static_cast<uint8_t>(std::clamp(bb_ * shade, 0.0f, 255.0f));
|
||
// Crack overlay: any pixel within 1 px of a crack column
|
||
// (with sway applied) becomes the crack color.
|
||
for (int cc : crackCols) {
|
||
if (std::abs(sx - cc) <= 1) {
|
||
r = cr; g = cg; b = cb;
|
||
break;
|
||
}
|
||
}
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-bark")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" base/crack : %s / %s\n",
|
||
baseHex.c_str(), crackHex.c_str());
|
||
std::printf(" density : %.4f (%d cracks)\n",
|
||
density, crackCount);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleClouds(int& i, int argc, char** argv) {
|
||
// Sky with puffy clouds. Multi-octave smooth noise (4
|
||
// octaves of cosine-product noise at doubling frequencies)
|
||
// gives soft cloud blobs; the result is thresholded by
|
||
// `coverage` so values above the threshold blend toward
|
||
// cloud color, and values below fade smoothly to sky.
|
||
std::string outPath = argv[++i];
|
||
std::string skyHex = argv[++i];
|
||
std::string cloudHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
float coverage = 0.5f; // 0=clear sky, 1=overcast
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptFloat(i, argc, argv, coverage);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
coverage < 0.0f || coverage > 1.0f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-clouds: invalid dims (W/H 1..8192, coverage 0..1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t sr, sg, sb, cr, cg, cb;
|
||
if (!parseHexOrError(skyHex, sr, sg, sb, "gen-texture-clouds")) return 1;
|
||
if (!parseHexOrError(cloudHex, cr, cg, cb, "gen-texture-clouds")) return 1;
|
||
float seedF = static_cast<float>(seed);
|
||
auto cloudNoise = [&](float x, float y) -> float {
|
||
// 4 octaves of sin/cos noise at doubling frequency,
|
||
// halving amplitude. Output in 0..1 after normalize.
|
||
float n = 0.0f;
|
||
float total = 0.0f;
|
||
float freq = 0.015f;
|
||
float amp = 1.0f;
|
||
for (int o = 0; o < 4; ++o) {
|
||
n += amp * (0.5f + 0.5f *
|
||
std::sin(x * freq + seedF * (1.0f + o * 0.7f)) *
|
||
std::cos(y * freq + seedF * (0.5f + o * 0.4f)));
|
||
total += amp;
|
||
freq *= 2.0f;
|
||
amp *= 0.5f;
|
||
}
|
||
return n / total;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Coverage maps to a noise threshold: low coverage = high
|
||
// threshold (only the brightest noise becomes clouds);
|
||
// high coverage = low threshold (more area is cloudy).
|
||
float thresh = 1.0f - coverage;
|
||
int cloudPixels = 0;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float n = cloudNoise(static_cast<float>(x),
|
||
static_cast<float>(y));
|
||
// Smooth blend across a 0.15-wide band around the
|
||
// threshold so cloud edges feather rather than step.
|
||
float t = std::clamp((n - thresh) / 0.15f, 0.0f, 1.0f);
|
||
if (t > 0.5f) ++cloudPixels;
|
||
uint8_t r = static_cast<uint8_t>(sr * (1 - t) + cr * t);
|
||
uint8_t g = static_cast<uint8_t>(sg * (1 - t) + cg * t);
|
||
uint8_t b = static_cast<uint8_t>(sb * (1 - t) + cb * t);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-clouds")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" sky/cloud : %s / %s\n",
|
||
skyHex.c_str(), cloudHex.c_str());
|
||
std::printf(" coverage : %.2f (%d cloud pixels)\n",
|
||
coverage, cloudPixels);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleStars(int& i, int argc, char** argv) {
|
||
// Night sky: solid background color sprinkled with bright
|
||
// stars at random positions and varied per-star brightness
|
||
// (so the sky has a depth feel — bright nearby stars + dim
|
||
// distant ones). Density controls roughly what fraction of
|
||
// pixels become stars.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string starHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
float density = 0.005f;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptFloat(i, argc, argv, density);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
density < 0.0f || density > 1.0f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stars: invalid dims (W/H 1..8192, density 0..1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br, bg, bb_, sr, sg, sb;
|
||
if (!parseHexOrError(bgHex, br, bg, bb_, "gen-texture-stars")) return 1;
|
||
if (!parseHexOrError(starHex, sr, sg, sb, "gen-texture-stars")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Background: flat fill.
|
||
for (int p = 0; p < W * H; ++p) {
|
||
size_t i2 = static_cast<size_t>(p) * 3;
|
||
pixels[i2 + 0] = br;
|
||
pixels[i2 + 1] = bg;
|
||
pixels[i2 + 2] = bb_;
|
||
}
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
int starCount = static_cast<int>(W * H * density);
|
||
int bright = 0, faint = 0;
|
||
for (int s = 0; s < starCount; ++s) {
|
||
int sx = static_cast<int>(next01() * W);
|
||
int sy = static_cast<int>(next01() * H);
|
||
// Brightness: weighted toward dim stars (most stars at
|
||
// 30..60% blend, occasional bright at 100%). Keeps the
|
||
// texture from looking like equally-bright pixel noise.
|
||
float r = next01();
|
||
float t = (r < 0.85f) ? (0.3f + r * 0.35f) : (0.85f + r * 0.15f);
|
||
if (t > 0.7f) ++bright; else ++faint;
|
||
size_t i2 = (static_cast<size_t>(sy) * W + sx) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(br * (1 - t) + sr * t);
|
||
pixels[i2 + 1] = static_cast<uint8_t>(bg * (1 - t) + sg * t);
|
||
pixels[i2 + 2] = static_cast<uint8_t>(bb_ * (1 - t) + sb * t);
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-stars")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/star : %s / %s\n",
|
||
bgHex.c_str(), starHex.c_str());
|
||
std::printf(" density : %.4f\n", density);
|
||
std::printf(" stars : %d (%d bright, %d faint)\n",
|
||
starCount, bright, faint);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleVines(int& i, int argc, char** argv) {
|
||
// Wall with climbing vines: solid wall background plus N
|
||
// vine paths that walk upward from the bottom edge with
|
||
// small horizontal jitter, leaving a 2-px-wide vine trail
|
||
// on every column they pass through.
|
||
std::string outPath = argv[++i];
|
||
std::string wallHex = argv[++i];
|
||
std::string vineHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int vineCount = 8;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, vineCount);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
vineCount < 0 || vineCount > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-vines: invalid dims (W/H 1..8192, vineCount 0..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t wr, wg, wb_, vr, vg, vb;
|
||
if (!parseHexOrError(wallHex, wr, wg, wb_, "gen-texture-vines")) return 1;
|
||
if (!parseHexOrError(vineHex, vr, vg, vb, "gen-texture-vines")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Background: flat wall color.
|
||
for (int p = 0; p < W * H; ++p) {
|
||
size_t i2 = static_cast<size_t>(p) * 3;
|
||
pixels[i2 + 0] = wr;
|
||
pixels[i2 + 1] = wg;
|
||
pixels[i2 + 2] = wb_;
|
||
}
|
||
// Each vine: pick a starting x at the bottom, walk upward
|
||
// with a small per-step horizontal drift. Set 2 pixels wide
|
||
// on each visited row so the vine reads as a thin band rather
|
||
// than a single-pixel line.
|
||
int leafPixels = 0;
|
||
for (int v = 0; v < vineCount; ++v) {
|
||
float x = next01() * W;
|
||
for (int y = H - 1; y >= 0; --y) {
|
||
// Drift: cosine wave + tiny random jitter.
|
||
x += std::cos(y * 0.08f + v * 1.7f) * 0.6f;
|
||
x += (next01() - 0.5f) * 0.4f;
|
||
int xi = static_cast<int>(x);
|
||
for (int dx = 0; dx < 2; ++dx) {
|
||
int px = xi + dx;
|
||
if (px < 0 || px >= W) continue;
|
||
size_t i2 = (static_cast<size_t>(y) * W + px) * 3;
|
||
pixels[i2 + 0] = vr;
|
||
pixels[i2 + 1] = vg;
|
||
pixels[i2 + 2] = vb;
|
||
++leafPixels;
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-vines")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" wall/vine : %s / %s\n",
|
||
wallHex.c_str(), vineHex.c_str());
|
||
std::printf(" vines : %d (%d painted pixels)\n",
|
||
vineCount, leafPixels);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleMosaic(int& i, int argc, char** argv) {
|
||
// 3-color mosaic: small square tiles randomly assigned one
|
||
// of 3 colors, with 1-px black grout lines between them.
|
||
// Per-tile color picked from a stable hash so the same seed
|
||
// always yields the same mosaic.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
std::string cHex = argv[++i];
|
||
int tilePx = 16;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, tilePx);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
tilePx < 4 || tilePx > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-mosaic: invalid dims (W/H 1..8192, tilePx 4..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ar, ag, ab, br, bg, bb_, cr, cg, cb;
|
||
if (!parseHexOrError(aHex, ar, ag, ab, "gen-texture-mosaic")) return 1;
|
||
if (!parseHexOrError(bHex, br, bg, bb_, "gen-texture-mosaic")) return 1;
|
||
if (!parseHexOrError(cHex, cr, cg, cb, "gen-texture-mosaic")) return 1;
|
||
auto cellPick = [seed](int cx, int cy) -> int {
|
||
uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
|
||
static_cast<uint32_t>(cy) * 668265263u +
|
||
seed * 2147483647u;
|
||
h = (h ^ (h >> 13)) * 1274126177u;
|
||
h = h ^ (h >> 16);
|
||
return h % 3;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
int counts[3] = {0, 0, 0};
|
||
for (int y = 0; y < H; ++y) {
|
||
int cy = y / tilePx;
|
||
int yInCell = y % tilePx;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx = x / tilePx;
|
||
int xInCell = x % tilePx;
|
||
// 1-px grout on the top and left edge of every cell.
|
||
bool grout = (xInCell == 0) || (yInCell == 0);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
if (grout) {
|
||
pixels[i2 + 0] = 0;
|
||
pixels[i2 + 1] = 0;
|
||
pixels[i2 + 2] = 0;
|
||
} else {
|
||
int pick = cellPick(cx, cy);
|
||
if (yInCell == 1 && xInCell == 1) ++counts[pick];
|
||
if (pick == 0) {
|
||
pixels[i2 + 0] = ar; pixels[i2 + 1] = ag; pixels[i2 + 2] = ab;
|
||
} else if (pick == 1) {
|
||
pixels[i2 + 0] = br; pixels[i2 + 1] = bg; pixels[i2 + 2] = bb_;
|
||
} else {
|
||
pixels[i2 + 0] = cr; pixels[i2 + 1] = cg; pixels[i2 + 2] = cb;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-mosaic")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" colors : %s / %s / %s\n",
|
||
aHex.c_str(), bHex.c_str(), cHex.c_str());
|
||
std::printf(" tile px : %d\n", tilePx);
|
||
std::printf(" tile counts: A=%d B=%d C=%d\n",
|
||
counts[0], counts[1], counts[2]);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleRust(int& i, int argc, char** argv) {
|
||
// Metal with rust patches: smooth multi-octave noise field
|
||
// thresholded by `coverage` to make rust blobs, blended
|
||
// with the metal base. Per-pixel grain jitter on top so
|
||
// both metal and rust regions read with subtle variation.
|
||
std::string outPath = argv[++i];
|
||
std::string metalHex = argv[++i];
|
||
std::string rustHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
float coverage = 0.4f; // 0=clean metal, 1=fully oxidized
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptFloat(i, argc, argv, coverage);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
coverage < 0.0f || coverage > 1.0f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rust: invalid dims (W/H 1..8192, coverage 0..1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t mr, mg, mb, rr, rg, rb;
|
||
if (!parseHexOrError(metalHex, mr, mg, mb, "gen-texture-rust")) return 1;
|
||
if (!parseHexOrError(rustHex, rr, rg, rb, "gen-texture-rust")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
float seedF = static_cast<float>(seed);
|
||
auto blob = [&](float x, float y) -> float {
|
||
// 3-octave smooth noise; sin/cos product avoids needing
|
||
// a permutation table.
|
||
float n = 0.0f, total = 0.0f;
|
||
float freq = 0.025f, amp = 1.0f;
|
||
for (int o = 0; o < 3; ++o) {
|
||
n += amp * (0.5f + 0.5f *
|
||
std::sin(x * freq + seedF * (1.0f + o)) *
|
||
std::cos(y * freq + seedF * (0.6f + o)));
|
||
total += amp;
|
||
freq *= 2.0f;
|
||
amp *= 0.5f;
|
||
}
|
||
return n / total; // 0..1
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
float thresh = 1.0f - coverage;
|
||
int rustPixels = 0;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float n = blob(static_cast<float>(x), static_cast<float>(y));
|
||
// Smoothstep across a 0.12 band around threshold so
|
||
// rust patches feather into clean metal.
|
||
float t = std::clamp((n - thresh) / 0.12f, 0.0f, 1.0f);
|
||
if (t > 0.5f) ++rustPixels;
|
||
// Per-pixel grain jitter (separate small jitter on
|
||
// each channel) so neither material reads as flat.
|
||
float jitter = (next01() - 0.5f) * 0.08f;
|
||
float r = (mr * (1 - t) + rr * t) * (1.0f + jitter);
|
||
float g = (mg * (1 - t) + rg * t) * (1.0f + jitter);
|
||
float b = (mb * (1 - t) + rb * t) * (1.0f + jitter);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(std::clamp(r, 0.0f, 255.0f));
|
||
pixels[i2 + 1] = static_cast<uint8_t>(std::clamp(g, 0.0f, 255.0f));
|
||
pixels[i2 + 2] = static_cast<uint8_t>(std::clamp(b, 0.0f, 255.0f));
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-rust")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" metal/rust : %s / %s\n",
|
||
metalHex.c_str(), rustHex.c_str());
|
||
std::printf(" coverage : %.2f (%d rust pixels)\n",
|
||
coverage, rustPixels);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleCircuit(int& i, int argc, char** argv) {
|
||
// Sci-fi circuit board: solid PCB background plus N traces
|
||
// that walk the surface in orthogonal Manhattan style — each
|
||
// trace alternates random horizontal + vertical segments,
|
||
// mimicking right-angle PCB routing. Each segment endpoint
|
||
// gets a "via" dot (3×3 block) so the routing reads as
|
||
// intentional rather than random scribbles.
|
||
std::string outPath = argv[++i];
|
||
std::string pcbHex = argv[++i];
|
||
std::string traceHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int traceCount = 24;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, traceCount);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
traceCount < 0 || traceCount > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-circuit: invalid dims (W/H 1..8192, traceCount 0..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t pr, pg, pb, tr, tg, tb;
|
||
if (!parseHexOrError(pcbHex, pr, pg, pb, "gen-texture-circuit")) return 1;
|
||
if (!parseHexOrError(traceHex, tr, tg, tb, "gen-texture-circuit")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Background fill
|
||
for (int p = 0; p < W * H; ++p) {
|
||
size_t i2 = static_cast<size_t>(p) * 3;
|
||
pixels[i2 + 0] = pr;
|
||
pixels[i2 + 1] = pg;
|
||
pixels[i2 + 2] = pb;
|
||
}
|
||
auto setPx = [&](int x, int y) {
|
||
if (x < 0 || y < 0 || x >= W || y >= H) return;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = tr;
|
||
pixels[i2 + 1] = tg;
|
||
pixels[i2 + 2] = tb;
|
||
};
|
||
auto setVia = [&](int x, int y) {
|
||
// 3×3 dot for vias / segment joints.
|
||
for (int dy = -1; dy <= 1; ++dy)
|
||
for (int dx = -1; dx <= 1; ++dx)
|
||
setPx(x + dx, y + dy);
|
||
};
|
||
int viaCount = 0;
|
||
for (int t = 0; t < traceCount; ++t) {
|
||
int x = static_cast<int>(next01() * W);
|
||
int y = static_cast<int>(next01() * H);
|
||
// Each trace runs 3-6 segments
|
||
int segs = 3 + static_cast<int>(next01() * 4);
|
||
bool horiz = next01() < 0.5f;
|
||
for (int s = 0; s < segs; ++s) {
|
||
int len = 8 + static_cast<int>(next01() * 24);
|
||
int dir = (next01() < 0.5f) ? 1 : -1;
|
||
int nx = x, ny = y;
|
||
for (int k = 0; k < len; ++k) {
|
||
if (horiz) nx += dir;
|
||
else ny += dir;
|
||
setPx(nx, ny);
|
||
}
|
||
x = nx; y = ny;
|
||
setVia(x, y); // joint at the corner
|
||
++viaCount;
|
||
horiz = !horiz; // alternate axis
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-circuit")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" pcb/trace : %s / %s\n",
|
||
pcbHex.c_str(), traceHex.c_str());
|
||
std::printf(" traces : %d (~%d vias)\n", traceCount, viaCount);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleCoral(int& i, int argc, char** argv) {
|
||
// Coral reef: water-color background plus N branching tree
|
||
// shapes that grow from random anchor points. Each branch
|
||
// walks a curved path (random angle drift), splitting into
|
||
// 2-3 sub-branches at random intervals so the result reads
|
||
// as organic coral rather than straight lines.
|
||
std::string outPath = argv[++i];
|
||
std::string waterHex = argv[++i];
|
||
std::string coralHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int branchCount = 12;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, branchCount);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
branchCount < 0 || branchCount > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-coral: invalid dims (W/H 1..8192, branchCount 0..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t wr, wg, wb_, cr, cg, cb;
|
||
if (!parseHexOrError(waterHex, wr, wg, wb_, "gen-texture-coral")) return 1;
|
||
if (!parseHexOrError(coralHex, cr, cg, cb, "gen-texture-coral")) return 1;
|
||
uint32_t state = seed ? seed : 1u;
|
||
auto next01 = [&state]() -> float {
|
||
state = state * 1664525u + 1013904223u;
|
||
return (state >> 8) * (1.0f / 16777216.0f);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int p = 0; p < W * H; ++p) {
|
||
size_t i2 = static_cast<size_t>(p) * 3;
|
||
pixels[i2 + 0] = wr; pixels[i2 + 1] = wg; pixels[i2 + 2] = wb_;
|
||
}
|
||
auto setPx = [&](int x, int y) {
|
||
if (x < 0 || y < 0 || x >= W || y >= H) return;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = cr; pixels[i2 + 1] = cg; pixels[i2 + 2] = cb;
|
||
};
|
||
// Recursive branch growth via explicit stack (no real
|
||
// recursion to avoid blowing through stack for deep splits).
|
||
struct Branch { float x, y, angle, length, thickness; };
|
||
std::vector<Branch> stack;
|
||
int totalBranches = 0;
|
||
for (int b = 0; b < branchCount; ++b) {
|
||
// Anchor at the bottom edge, growing upward
|
||
Branch root;
|
||
root.x = next01() * W;
|
||
root.y = H - 1;
|
||
root.angle = -3.14159f * 0.5f + (next01() - 0.5f) * 0.6f;
|
||
root.length = 30 + next01() * 40;
|
||
root.thickness = 2.0f;
|
||
stack.push_back(root);
|
||
while (!stack.empty()) {
|
||
Branch br = stack.back();
|
||
stack.pop_back();
|
||
++totalBranches;
|
||
float x = br.x, y = br.y;
|
||
int steps = static_cast<int>(br.length);
|
||
for (int s = 0; s < steps; ++s) {
|
||
// Random walk + slight upward bias
|
||
br.angle += (next01() - 0.5f) * 0.15f;
|
||
x += std::cos(br.angle);
|
||
y += std::sin(br.angle);
|
||
int rad = static_cast<int>(std::ceil(br.thickness));
|
||
for (int dy = -rad; dy <= rad; ++dy) {
|
||
for (int dx = -rad; dx <= rad; ++dx) {
|
||
if (dx*dx + dy*dy > rad*rad) continue;
|
||
setPx(static_cast<int>(x) + dx,
|
||
static_cast<int>(y) + dy);
|
||
}
|
||
}
|
||
// Split occasionally
|
||
if (next01() < 0.05f && br.thickness > 1.0f) {
|
||
Branch child;
|
||
child.x = x; child.y = y;
|
||
child.angle = br.angle + (next01() - 0.5f) * 1.2f;
|
||
child.length = br.length * (0.4f + next01() * 0.3f);
|
||
child.thickness = br.thickness * 0.7f;
|
||
if (stack.size() < 256) stack.push_back(child);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-coral")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" water/coral : %s / %s\n",
|
||
waterHex.c_str(), coralHex.c_str());
|
||
std::printf(" branches : %d roots → %d total (with splits)\n",
|
||
branchCount, totalBranches);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleFlame(int& i, int argc, char** argv) {
|
||
// Flame: vertical color gradient from dark hex at the
|
||
// bottom to hot hex at the top, mixed with smooth noise
|
||
// flicker so the boundary between hot and dark wavers
|
||
// randomly. Reads as a flame seen from a distance.
|
||
std::string outPath = argv[++i];
|
||
std::string darkHex = argv[++i];
|
||
std::string hotHex = argv[++i];
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-flame: invalid dims (W/H 1..8192)\n");
|
||
return 1;
|
||
}
|
||
uint8_t dr, dg, db, hr, hg, hb;
|
||
if (!parseHexOrError(darkHex, dr, dg, db, "gen-texture-flame")) return 1;
|
||
if (!parseHexOrError(hotHex, hr, hg, hb, "gen-texture-flame")) return 1;
|
||
float seedF = static_cast<float>(seed);
|
||
auto noise = [&](float x, float y) -> float {
|
||
// Multi-octave smooth noise; lower freq dominates.
|
||
float n = 0.0f, total = 0.0f;
|
||
float freq = 0.04f, amp = 1.0f;
|
||
for (int o = 0; o < 3; ++o) {
|
||
n += amp * (0.5f + 0.5f *
|
||
std::sin(x * freq + seedF * (1.0f + o)) *
|
||
std::cos(y * freq + seedF * (0.5f + o)));
|
||
total += amp;
|
||
freq *= 2.0f;
|
||
amp *= 0.5f;
|
||
}
|
||
return n / total;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
// Vertical position: 0 at bottom (dark), 1 at top (hot).
|
||
float vy = static_cast<float>(H - 1 - y) / (H - 1);
|
||
for (int x = 0; x < W; ++x) {
|
||
// Add wavy flicker via noise so the gradient boundary
|
||
// isn't a clean horizontal line.
|
||
float n = noise(static_cast<float>(x), static_cast<float>(y));
|
||
float t = std::clamp(vy + (n - 0.5f) * 0.4f, 0.0f, 1.0f);
|
||
// Curve so the bottom stays dark longer and the top
|
||
// saturates faster (real flames are mostly dark with
|
||
// a bright core/tip).
|
||
t = t * t;
|
||
uint8_t r = static_cast<uint8_t>(dr * (1 - t) + hr * t);
|
||
uint8_t g = static_cast<uint8_t>(dg * (1 - t) + hg * t);
|
||
uint8_t b = static_cast<uint8_t>(db * (1 - t) + hb * t);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-flame")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" dark/hot : %s / %s\n",
|
||
darkHex.c_str(), hotHex.c_str());
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleTartan(int& i, int argc, char** argv) {
|
||
// Tartan plaid: 3-color crossing band pattern. Each cell
|
||
// belongs to one of 6 logical zones (3 vertical + 3
|
||
// horizontal bands per repeat unit) and the displayed
|
||
// color is the additive mix of the band's vertical and
|
||
// horizontal contributions — produces the characteristic
|
||
// overlap diamond grid of Scottish tartans.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
std::string cHex = argv[++i];
|
||
int bandPx = 32;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, bandPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
bandPx < 4 || bandPx > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-tartan: invalid dims (W/H 1..8192, bandPx 4..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ar, ag, ab, br, bg, bb_, cr_, cg_, cb_;
|
||
if (!parseHexOrError(aHex, ar, ag, ab, "gen-texture-tartan")) return 1;
|
||
if (!parseHexOrError(bHex, br, bg, bb_, "gen-texture-tartan")) return 1;
|
||
if (!parseHexOrError(cHex, cr_, cg_, cb_, "gen-texture-tartan")) return 1;
|
||
// 3-band repeat: A wide, B narrow, C medium. Repeat is
|
||
// 6 × bandPx wide. Each band weight is constant within
|
||
// its slice; the displayed pixel color is averaged from
|
||
// the vertical band (column) and horizontal band (row).
|
||
auto bandColor = [&](int t) -> std::tuple<uint8_t, uint8_t, uint8_t> {
|
||
// t is position modulo (6 * bandPx). Map to one of A/B/C
|
||
// based on which segment t falls in.
|
||
int slice = (t / bandPx) % 6;
|
||
// 6-slice repeat pattern: A A B C C B (gives a typical
|
||
// tartan look — wide A blocks separated by thin B/C lines).
|
||
switch (slice) {
|
||
case 0: case 1: return {ar, ag, ab};
|
||
case 2: return {br, bg, bb_};
|
||
case 3: case 4: return {cr_, cg_, cb_};
|
||
default: return {br, bg, bb_};
|
||
}
|
||
};
|
||
int repeat = 6 * bandPx;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int yMod = ((y % repeat) + repeat) % repeat;
|
||
auto [hr, hg, hb] = bandColor(yMod);
|
||
for (int x = 0; x < W; ++x) {
|
||
int xMod = ((x % repeat) + repeat) % repeat;
|
||
auto [vr, vg, vb] = bandColor(xMod);
|
||
// Average the horizontal-band and vertical-band
|
||
// colors. At intersections the average produces a
|
||
// distinct mid-tone that creates the diamond grid
|
||
// characteristic of plaid.
|
||
uint8_t r = static_cast<uint8_t>((hr + vr) / 2);
|
||
uint8_t g = static_cast<uint8_t>((hg + vg) / 2);
|
||
uint8_t b = static_cast<uint8_t>((hb + vb) / 2);
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = r;
|
||
pixels[i2 + 1] = g;
|
||
pixels[i2 + 2] = b;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-tartan")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" colors A/B/C: %s / %s / %s\n",
|
||
aHex.c_str(), bHex.c_str(), cHex.c_str());
|
||
std::printf(" band px : %d (repeat %d px)\n",
|
||
bandPx, repeat);
|
||
return 0;
|
||
}
|
||
|
||
int handleArgyle(int& i, int argc, char** argv) {
|
||
// Argyle: classic sweater-knit pattern of rotated squares
|
||
// (lozenges) in checkerboard alternation, overlaid with
|
||
// diagonal stitch lines in a third color. The rotation is
|
||
// achieved by working in the rotated coord system (u, v) =
|
||
// (x + y, x - y); each tile becomes a unit cell there.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
std::string stitchHex = argv[++i];
|
||
int cellPx = 64;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellPx);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellPx < 8 || cellPx > 512) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-argyle: invalid dims (W/H 1..8192, cellPx 8..512)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ar, ag, ab, br, bg, bb_, sr_, sg_, sb_;
|
||
if (!parseHexOrError(aHex, ar, ag, ab, "gen-texture-argyle")) return 1;
|
||
if (!parseHexOrError(bHex, br, bg, bb_, "gen-texture-argyle")) return 1;
|
||
if (!parseHexOrError(stitchHex, sr_, sg_, sb_, "gen-texture-argyle")) return 1;
|
||
// Stitch lines are 2 pixels wide regardless of cell size — at
|
||
// very small cells they'd dominate, but cellPx>=8 keeps them
|
||
// visually subordinate to the diamond fill.
|
||
const int stitchHalfWidth = 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Rotate the lattice 45° by mapping to (u, v) = (x+y, x-y).
|
||
// Lozenge cells in the original frame become axis-aligned
|
||
// squares in (u, v) space, easy to checkerboard.
|
||
int u = x + y;
|
||
int v = x - y;
|
||
int uCell = u / cellPx;
|
||
int vCell;
|
||
// Floor division for negative v so the lattice stays
|
||
// consistent across the whole image (avoids a seam at x<y).
|
||
if (v >= 0) vCell = v / cellPx;
|
||
else vCell = -((-v + cellPx - 1) / cellPx);
|
||
uint8_t r, g, b;
|
||
if (((uCell + vCell) & 1) == 0) {
|
||
r = ar; g = ag; b = ab;
|
||
} else {
|
||
r = br; g = bg; b = bb_;
|
||
}
|
||
// Stitch lines: 2-px-wide bands along the lattice grid
|
||
// (i.e. at u % cellPx ≈ 0 and v % cellPx ≈ 0). These are
|
||
// the diagonal lines characteristic of the argyle look.
|
||
int uMod = ((u % cellPx) + cellPx) % cellPx;
|
||
int vMod = ((v % cellPx) + cellPx) % cellPx;
|
||
bool onStitch =
|
||
(uMod <= stitchHalfWidth || uMod >= cellPx - stitchHalfWidth) ||
|
||
(vMod <= stitchHalfWidth || vMod >= cellPx - stitchHalfWidth);
|
||
if (onStitch) {
|
||
r = sr_; g = sg_; b = sb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-argyle")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" colors A/B : %s / %s\n", aHex.c_str(), bHex.c_str());
|
||
std::printf(" stitch : %s\n", stitchHex.c_str());
|
||
std::printf(" cell px : %d\n", cellPx);
|
||
return 0;
|
||
}
|
||
|
||
int handleHerringbone(int& i, int argc, char** argv) {
|
||
// Herringbone (chevron-style): horizontal strips of slanted
|
||
// parallel lines whose slant direction flips every strip,
|
||
// producing the V-shaped "fish bone" pattern that's the
|
||
// hallmark of herringbone fabric and parquet flooring.
|
||
// Implemented as a per-pixel shear: shifting x by the row's
|
||
// local-y collapses each diagonal line into a vertical band
|
||
// in shifted-x space, where modular arithmetic picks line vs
|
||
// background.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string lineHex = argv[++i];
|
||
int stripHeight = 32; // height of each constant-direction strip
|
||
int lineSpacing = 12; // distance between adjacent lines along x
|
||
int lineWidth = 4; // line thickness in shifted-x coords
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stripHeight);
|
||
parseOptInt(i, argc, argv, lineSpacing);
|
||
parseOptInt(i, argc, argv, lineWidth);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stripHeight < 4 || stripHeight > 256 ||
|
||
lineSpacing < 4 || lineSpacing > 256 ||
|
||
lineWidth < 1 || lineWidth >= lineSpacing) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-herringbone: invalid dims (W/H 1..8192, stripH 4..256, "
|
||
"spacing 4..256, lineW 1..spacing-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, lr_, lg_, lb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-herringbone")) return 1;
|
||
if (!parseHexOrError(lineHex, lr_, lg_, lb_, "gen-texture-herringbone")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int rowOfStrips = y / stripHeight;
|
||
int withinStrip = y - rowOfStrips * stripHeight;
|
||
// Even strips: lines slant down-right (+45°-ish, scaled by
|
||
// stripHeight/lineSpacing). Odd strips: slant down-left.
|
||
int sign = (rowOfStrips & 1) ? -1 : 1;
|
||
for (int x = 0; x < W; ++x) {
|
||
// Shift x by ±withinStrip — collapses the slanted line
|
||
// into a vertical strip in shifted-x coords.
|
||
int shifted = x + sign * withinStrip;
|
||
int phase = ((shifted % lineSpacing) + lineSpacing) % lineSpacing;
|
||
uint8_t r, g, b;
|
||
if (phase < lineWidth) {
|
||
r = lr_; g = lg_; b = lb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-herringbone")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / line : %s / %s\n", bgHex.c_str(), lineHex.c_str());
|
||
std::printf(" strip H : %d (slant flips per strip)\n", stripHeight);
|
||
std::printf(" line : width %d / spacing %d\n",
|
||
lineWidth, lineSpacing);
|
||
return 0;
|
||
}
|
||
|
||
int handleScales(int& i, int argc, char** argv) {
|
||
// Scales: fish / dragon / chain mail pattern. Each scale is a
|
||
// circle whose center sits at the bottom-center of a cell;
|
||
// adjacent rows are offset by half a cell width so the
|
||
// circles interlock into the classic overlapping-scale look.
|
||
// Three colors: background (gaps), scale body, and a rim
|
||
// highlight near the top of each scale that gives the
|
||
// armoured/raised appearance.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string scaleHex = argv[++i];
|
||
std::string rimHex = argv[++i];
|
||
int cellW = 24;
|
||
int cellH = 16; // shorter than wide for natural overlap
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellW);
|
||
parseOptInt(i, argc, argv, cellH);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellW < 4 || cellW > 256 ||
|
||
cellH < 4 || cellH > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-scales: invalid dims (W/H 1..8192, cellW/H 4..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr_, sg_, sb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-scales")) return 1;
|
||
if (!parseHexOrError(scaleHex, sr_, sg_, sb_, "gen-texture-scales")) return 1;
|
||
if (!parseHexOrError(rimHex, rr_, rg_, rb_, "gen-texture-scales")) return 1;
|
||
// Scale radius is 55% of cell width so adjacent scales in the
|
||
// same row touch + slightly overlap, and rows interlock cleanly
|
||
// through the half-row stagger.
|
||
float scaleR = cellW * 0.55f;
|
||
float scaleR2 = scaleR * scaleR;
|
||
// Rim threshold: top 25% of each scale gets the rim color.
|
||
float rimNormY = 0.55f;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int rowIdx = y / cellH;
|
||
int shift = (rowIdx & 1) ? cellW / 2 : 0;
|
||
for (int x = 0; x < W; ++x) {
|
||
// Snap x into the current row's lattice (with stagger).
|
||
// Use floor-div semantics that work for x near 0.
|
||
int xRel = x - shift;
|
||
int col;
|
||
if (xRel >= 0) col = xRel / cellW;
|
||
else col = -((-xRel + cellW - 1) / cellW);
|
||
// Scale center: bottom-middle of the cell.
|
||
float cx = col * cellW + shift + cellW * 0.5f;
|
||
float cy = rowIdx * cellH + cellH;
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float distSq = dx * dx + dy * dy;
|
||
uint8_t r, g, b;
|
||
if (distSq < scaleR2) {
|
||
// Inside a scale. -dy/R is 0 at center, ~1 at top.
|
||
float normY = -dy / scaleR;
|
||
if (normY > rimNormY) {
|
||
r = rr_; g = rg_; b = rb_;
|
||
} else {
|
||
r = sr_; g = sg_; b = sb_;
|
||
}
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-scales")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/scale/rim : %s / %s / %s\n",
|
||
bgHex.c_str(), scaleHex.c_str(), rimHex.c_str());
|
||
std::printf(" cell : %dx%d (radius %.1f, half-row stagger)\n",
|
||
cellW, cellH, scaleR);
|
||
return 0;
|
||
}
|
||
|
||
int handleStainedGlass(int& i, int argc, char** argv) {
|
||
// Stained glass: Voronoi-cell pattern with dark lead lines
|
||
// separating colored regions. Each pixel is classified by
|
||
// which seed point it's closest to; pixels near a cell
|
||
// boundary (small relative gap to the second-nearest seed)
|
||
// become the lead color, producing the leaded-glass look.
|
||
// Three stained colors cycle across cells (cellIdx % 3) for
|
||
// a balanced palette without per-cell color authoring.
|
||
std::string outPath = argv[++i];
|
||
std::string leadHex = argv[++i];
|
||
std::string aHex = argv[++i];
|
||
std::string bHex = argv[++i];
|
||
std::string cHex = argv[++i];
|
||
int cellCount = 32;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellCount);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellCount < 4 || cellCount > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stained-glass: invalid dims (W/H 1..8192, cells 4..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t lr_, lg_, lb_, ar, ag, ab, br, bg, bb_, cr_, cg_, cb_;
|
||
if (!parseHexOrError(leadHex, lr_, lg_, lb_, "gen-texture-stained-glass")) return 1;
|
||
if (!parseHexOrError(aHex, ar, ag, ab, "gen-texture-stained-glass")) return 1;
|
||
if (!parseHexOrError(bHex, br, bg, bb_, "gen-texture-stained-glass")) return 1;
|
||
if (!parseHexOrError(cHex, cr_, cg_, cb_, "gen-texture-stained-glass")) return 1;
|
||
// Deterministic seed placement — same image dimensions and
|
||
// cellCount always yield the same cells, so re-running the
|
||
// command reproduces previous output exactly.
|
||
struct Seed { float x, y; int colorIdx; };
|
||
std::vector<Seed> seeds;
|
||
seeds.reserve(cellCount);
|
||
uint32_t rng = static_cast<uint32_t>(cellCount) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu;
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
for (int s = 0; s < cellCount; ++s) {
|
||
Seed sd;
|
||
sd.x = (rngStep() & 0xFFFF) / 65535.0f * W;
|
||
sd.y = (rngStep() & 0xFFFF) / 65535.0f * H;
|
||
sd.colorIdx = s % 3;
|
||
seeds.push_back(sd);
|
||
}
|
||
// Lead-line threshold: pixels where dist2/dist1 < threshold
|
||
// are within the boundary band. 1.08 gives ~3-4 px lead
|
||
// lines at 256x256 with 32 cells — readable but not heavy.
|
||
const float boundaryRatio = 1.08f;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float fx = static_cast<float>(x);
|
||
float fy = static_cast<float>(y);
|
||
// Track best two distances so we can detect cell
|
||
// boundaries by the dist2/dist1 ratio.
|
||
float bestSq = 1e30f, secondSq = 1e30f;
|
||
int bestIdx = 0;
|
||
for (int s = 0; s < cellCount; ++s) {
|
||
float dx = seeds[s].x - fx;
|
||
float dy = seeds[s].y - fy;
|
||
float d2 = dx * dx + dy * dy;
|
||
if (d2 < bestSq) {
|
||
secondSq = bestSq;
|
||
bestSq = d2;
|
||
bestIdx = s;
|
||
} else if (d2 < secondSq) {
|
||
secondSq = d2;
|
||
}
|
||
}
|
||
uint8_t r, g, b;
|
||
// sqrt comparison via ratio of squared distances
|
||
// works because boundaryRatio^2 is what we compare.
|
||
float ratioSq = (bestSq > 0.0f) ? secondSq / bestSq : 1e30f;
|
||
if (ratioSq < boundaryRatio * boundaryRatio) {
|
||
r = lr_; g = lg_; b = lb_;
|
||
} else {
|
||
int ci = seeds[bestIdx].colorIdx;
|
||
if (ci == 0) { r = ar; g = ag; b = ab; }
|
||
else if (ci == 1) { r = br; g = bg; b = bb_; }
|
||
else { r = cr_; g = cg_; b = cb_; }
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-stained-glass")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" lead : %s\n", leadHex.c_str());
|
||
std::printf(" glass A/B/C: %s / %s / %s\n",
|
||
aHex.c_str(), bHex.c_str(), cHex.c_str());
|
||
std::printf(" cells : %d (Voronoi)\n", cellCount);
|
||
return 0;
|
||
}
|
||
|
||
int handleShingles(int& i, int argc, char** argv) {
|
||
// Roof shingles: offset rows of rectangular tiles, with a
|
||
// dark shadow band at the top of each row (where the row
|
||
// above overlaps) and thin vertical seams between adjacent
|
||
// shingles in a row. Three colors give the shingle body
|
||
// its base tone, a shadow tone for the overlap band, and
|
||
// a darker seam color.
|
||
std::string outPath = argv[++i];
|
||
std::string baseHex = argv[++i];
|
||
std::string shadowHex = argv[++i];
|
||
std::string seamHex = argv[++i];
|
||
int shingleW = 32;
|
||
int shingleH = 24;
|
||
int shadowH = 4; // shadow band thickness at top of each row
|
||
int seamW = 1; // vertical seam width between shingles
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, shingleW);
|
||
parseOptInt(i, argc, argv, shingleH);
|
||
parseOptInt(i, argc, argv, shadowH);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
shingleW < 4 || shingleW > 512 ||
|
||
shingleH < 4 || shingleH > 512 ||
|
||
shadowH < 0 || shadowH >= shingleH) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-shingles: invalid dims (W/H 1..8192, shingleW/H 4..512, shadowH 0..shingleH-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr_, sg_, sb_, er_, eg_, eb_;
|
||
if (!parseHexOrError(baseHex, br_, bg_, bb_, "gen-texture-shingles")) return 1;
|
||
if (!parseHexOrError(shadowHex, sr_, sg_, sb_, "gen-texture-shingles")) return 1;
|
||
if (!parseHexOrError(seamHex, er_, eg_, eb_, "gen-texture-shingles")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int rowIdx = y / shingleH;
|
||
int withinRow = y - rowIdx * shingleH;
|
||
int shift = (rowIdx & 1) ? shingleW / 2 : 0;
|
||
for (int x = 0; x < W; ++x) {
|
||
// Position within the current shingle along x.
|
||
int xRel = x - shift;
|
||
int xMod;
|
||
if (xRel >= 0) xMod = xRel % shingleW;
|
||
else xMod = ((xRel % shingleW) + shingleW) % shingleW;
|
||
uint8_t r, g, b;
|
||
if (withinRow < shadowH) {
|
||
// Top of row: shadow band where the row above
|
||
// overlaps this row's shingles.
|
||
r = sr_; g = sg_; b = sb_;
|
||
} else if (xMod < seamW || xMod >= shingleW - seamW) {
|
||
// Vertical seam between adjacent shingles.
|
||
r = er_; g = eg_; b = eb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-shingles")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" base/shadow/seam: %s / %s / %s\n",
|
||
baseHex.c_str(), shadowHex.c_str(), seamHex.c_str());
|
||
std::printf(" shingle : %dx%d (shadow %d px, seam %d px)\n",
|
||
shingleW, shingleH, shadowH, seamW);
|
||
return 0;
|
||
}
|
||
|
||
int handleFrost(int& i, int argc, char** argv) {
|
||
// Frost: scattered crystal nuclei with radial spikes.
|
||
// Each seed gets six thin lines radiating at 60° intervals
|
||
// (with a per-seed random angular offset so they don't all
|
||
// align). Line lengths are jittered per spike, and pixel
|
||
// intensity falls off linearly toward the end of each line
|
||
// so spikes fade naturally into the background.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string iceHex = argv[++i];
|
||
int seedCount = 80;
|
||
int rayLen = 18;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, seedCount);
|
||
parseOptInt(i, argc, argv, rayLen);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
seedCount < 1 || seedCount > 8192 ||
|
||
rayLen < 2 || rayLen > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-frost: invalid dims (W/H 1..8192, seeds 1..8192, ray 2..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, ir, ig, ib;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-frost")) return 1;
|
||
if (!parseHexOrError(iceHex, ir, ig, ib, "gen-texture-frost")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Fill background.
|
||
for (size_t p = 0; p < pixels.size(); p += 3) {
|
||
pixels[p + 0] = br_;
|
||
pixels[p + 1] = bg_;
|
||
pixels[p + 2] = bb_;
|
||
}
|
||
// Deterministic RNG so re-runs reproduce the same frost.
|
||
uint32_t rng = static_cast<uint32_t>(seedCount) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu +
|
||
static_cast<uint32_t>(rayLen);
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
auto blendPixel = [&](int x, int y, float alpha) {
|
||
if (x < 0 || x >= W || y < 0 || y >= H) return;
|
||
if (alpha <= 0) return;
|
||
if (alpha > 1.0f) alpha = 1.0f;
|
||
size_t idx = (static_cast<size_t>(y) * W + x) * 3;
|
||
// Linear blend from bg toward ice color by alpha.
|
||
pixels[idx + 0] = static_cast<uint8_t>(
|
||
pixels[idx + 0] + (ir - pixels[idx + 0]) * alpha);
|
||
pixels[idx + 1] = static_cast<uint8_t>(
|
||
pixels[idx + 1] + (ig - pixels[idx + 1]) * alpha);
|
||
pixels[idx + 2] = static_cast<uint8_t>(
|
||
pixels[idx + 2] + (ib - pixels[idx + 2]) * alpha);
|
||
};
|
||
constexpr float kPi = 3.14159265358979323846f;
|
||
for (int s = 0; s < seedCount; ++s) {
|
||
// Seed position uniformly random across the image.
|
||
float sx = (rngStep() & 0xFFFF) / 65535.0f * W;
|
||
float sy = (rngStep() & 0xFFFF) / 65535.0f * H;
|
||
// Angular jitter so spikes don't all align to the same
|
||
// 6-fold rosette.
|
||
float baseAngle = (rngStep() & 0xFFFF) / 65535.0f * kPi / 3.0f;
|
||
// 6 rays per nucleus at 60° spacing.
|
||
for (int r = 0; r < 6; ++r) {
|
||
float angle = baseAngle + r * (kPi / 3.0f);
|
||
float dx = std::cos(angle);
|
||
float dy = std::sin(angle);
|
||
// Per-spike length jitter (60-100% of nominal).
|
||
float lenScale = 0.6f + (rngStep() & 0xFFFF) / 65535.0f * 0.4f;
|
||
int spikeLen = static_cast<int>(rayLen * lenScale);
|
||
// Walk pixels along the ray. Alpha falls linearly
|
||
// from 1.0 at the seed to 0.0 at the end of the spike.
|
||
for (int t = 0; t < spikeLen; ++t) {
|
||
int px = static_cast<int>(sx + dx * t);
|
||
int py = static_cast<int>(sy + dy * t);
|
||
float alpha = 1.0f - static_cast<float>(t) / spikeLen;
|
||
blendPixel(px, py, alpha);
|
||
}
|
||
}
|
||
// Bright nucleus dot — a 2x2 block to make the seed
|
||
// visible even when its spikes are short.
|
||
for (int dyN = 0; dyN < 2; ++dyN) {
|
||
for (int dxN = 0; dxN < 2; ++dxN) {
|
||
int px = static_cast<int>(sx) + dxN;
|
||
int py = static_cast<int>(sy) + dyN;
|
||
blendPixel(px, py, 1.0f);
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-frost")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / ice : %s / %s\n", bgHex.c_str(), iceHex.c_str());
|
||
std::printf(" seeds : %d (6-spike rosettes, ray %d px)\n",
|
||
seedCount, rayLen);
|
||
return 0;
|
||
}
|
||
|
||
int handleParquet(int& i, int argc, char** argv) {
|
||
// Parquet: basket-weave wood floor pattern. The image is
|
||
// tiled with 2N x 2N cells; cells alternate orientation in
|
||
// a checkerboard so half are split into 2 horizontal planks
|
||
// and half into 2 vertical planks. Two wood colors (one
|
||
// per orientation) make the basket-weave structure pop;
|
||
// a third "gap" color paints thin lines along plank edges
|
||
// for the inset / wood-joint look.
|
||
std::string outPath = argv[++i];
|
||
std::string woodAHex = argv[++i];
|
||
std::string woodBHex = argv[++i];
|
||
std::string gapHex = argv[++i];
|
||
int cellSize = 32; // cell side = 2N; each plank is N wide
|
||
int gapW = 1; // gap line thickness between planks
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellSize);
|
||
parseOptInt(i, argc, argv, gapW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellSize < 8 || cellSize > 512 ||
|
||
gapW < 0 || gapW * 4 >= cellSize) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-parquet: invalid dims (W/H 1..8192, cellSize 8..512, gap 0..cellSize/4)\n");
|
||
return 1;
|
||
}
|
||
uint8_t ar, ag, ab, br, bg, bb_, gr, gg, gb_;
|
||
if (!parseHexOrError(woodAHex, ar, ag, ab, "gen-texture-parquet")) return 1;
|
||
if (!parseHexOrError(woodBHex, br, bg, bb_, "gen-texture-parquet")) return 1;
|
||
if (!parseHexOrError(gapHex, gr, gg, gb_, "gen-texture-parquet")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
// Use floor division for negative coords (just-in-case
|
||
// future callers pass tile-offset images).
|
||
int cellY = y / cellSize;
|
||
int yMod = y - cellY * cellSize;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cellX = x / cellSize;
|
||
int xMod = x - cellX * cellSize;
|
||
// Checkerboard: (cellX + cellY) even -> horizontal
|
||
// planks (long axis along X, two stacked vertically);
|
||
// odd -> vertical planks (long axis along Y, two
|
||
// side by side).
|
||
bool horizontalPair = (((cellX + cellY) & 1) == 0);
|
||
uint8_t r, g, b;
|
||
if (horizontalPair) {
|
||
// 2 horizontal planks: top half = wood A, bottom
|
||
// half = wood A (same color since the orientation
|
||
// is what matters for the weave). Gap line at the
|
||
// midline between the two planks, plus around the
|
||
// cell perimeter.
|
||
bool inMidline = (yMod >= cellSize / 2 - gapW &&
|
||
yMod < cellSize / 2 + gapW);
|
||
bool onCellEdge = (yMod < gapW || yMod >= cellSize - gapW ||
|
||
xMod < gapW || xMod >= cellSize - gapW);
|
||
if (inMidline || onCellEdge) {
|
||
r = gr; g = gg; b = gb_;
|
||
} else {
|
||
r = ar; g = ag; b = ab;
|
||
}
|
||
} else {
|
||
// 2 vertical planks: left half + right half (wood B).
|
||
// Gap line at the vertical midline.
|
||
bool inMidline = (xMod >= cellSize / 2 - gapW &&
|
||
xMod < cellSize / 2 + gapW);
|
||
bool onCellEdge = (yMod < gapW || yMod >= cellSize - gapW ||
|
||
xMod < gapW || xMod >= cellSize - gapW);
|
||
if (inMidline || onCellEdge) {
|
||
r = gr; g = gg; b = gb_;
|
||
} else {
|
||
r = br; g = bg; b = bb_;
|
||
}
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-parquet")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" wood A/B : %s / %s (%s gap)\n",
|
||
woodAHex.c_str(), woodBHex.c_str(), gapHex.c_str());
|
||
std::printf(" cell : %d px (gap %d px, basket-weave)\n",
|
||
cellSize, gapW);
|
||
return 0;
|
||
}
|
||
|
||
int handleBubbles(int& i, int argc, char** argv) {
|
||
// Bubbles: scattered circles of varied radii, drawn as
|
||
// translucent fills with a brighter rim. Bubbles overlap;
|
||
// rim color wins at any pixel that lies in any bubble's
|
||
// ring band (so overlapping outlines stay readable).
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string fillHex = argv[++i];
|
||
std::string rimHex = argv[++i];
|
||
int bubbleCount = 50;
|
||
int minR = 6;
|
||
int maxR = 24;
|
||
int rimW = 2;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, bubbleCount);
|
||
parseOptInt(i, argc, argv, minR);
|
||
parseOptInt(i, argc, argv, maxR);
|
||
parseOptInt(i, argc, argv, rimW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
bubbleCount < 1 || bubbleCount > 4096 ||
|
||
minR < 1 || maxR < minR || maxR > 1024 ||
|
||
rimW < 1 || rimW > minR) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bubbles: invalid dims (W/H 1..8192, bubbles 1..4096, "
|
||
"minR..maxR 1..1024, rimW 1..minR)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, fr, fg, fb_, rr, rg, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-bubbles")) return 1;
|
||
if (!parseHexOrError(fillHex, fr, fg, fb_, "gen-texture-bubbles")) return 1;
|
||
if (!parseHexOrError(rimHex, rr, rg, rb_, "gen-texture-bubbles")) return 1;
|
||
// Deterministic seed placement so re-runs reproduce.
|
||
struct Bubble { int x, y, r; int rimRsq; int rSq; };
|
||
std::vector<Bubble> bubbles;
|
||
bubbles.reserve(bubbleCount);
|
||
uint32_t rng = static_cast<uint32_t>(bubbleCount) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu +
|
||
static_cast<uint32_t>(maxR);
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
int radSpan = maxR - minR + 1;
|
||
for (int s = 0; s < bubbleCount; ++s) {
|
||
Bubble b;
|
||
b.x = static_cast<int>((rngStep() & 0xFFFF) / 65535.0f * W);
|
||
b.y = static_cast<int>((rngStep() & 0xFFFF) / 65535.0f * H);
|
||
b.r = minR + static_cast<int>(rngStep() % radSpan);
|
||
b.rSq = b.r * b.r;
|
||
int innerR = std::max(1, b.r - rimW);
|
||
b.rimRsq = innerR * innerR;
|
||
bubbles.push_back(b);
|
||
}
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
bool onRim = false;
|
||
bool hasFill = false;
|
||
for (const auto& b : bubbles) {
|
||
int dx = b.x - x;
|
||
int dy = b.y - y;
|
||
int distSq = dx * dx + dy * dy;
|
||
if (distSq > b.rSq) continue;
|
||
hasFill = true;
|
||
if (distSq >= b.rimRsq) {
|
||
onRim = true;
|
||
break; // rim wins; no need to check further
|
||
}
|
||
}
|
||
uint8_t r, g, b;
|
||
if (onRim) {
|
||
r = rr; g = rg; b = rb_;
|
||
} else if (hasFill) {
|
||
r = fr; g = fg; b = fb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-bubbles")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/fill/rim: %s / %s / %s\n",
|
||
bgHex.c_str(), fillHex.c_str(), rimHex.c_str());
|
||
std::printf(" bubbles : %d (radius %d-%d, rim %d px)\n",
|
||
bubbleCount, minR, maxR, rimW);
|
||
return 0;
|
||
}
|
||
|
||
int handleSpiderWeb(int& i, int argc, char** argv) {
|
||
// Spider web: classic geometric web with N radial spokes
|
||
// and M concentric polygonal rings centered on the image.
|
||
// Spokes are detected by angular distance to the nearest
|
||
// multiple of 2pi/N (scaled by radius so spokes are pixel-
|
||
// wide near the center and stay readable far out). Rings
|
||
// are detected by radial distance to the nearest of M
|
||
// evenly-spaced radii.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string webHex = argv[++i];
|
||
int spokes = 8;
|
||
int rings = 5;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, spokes);
|
||
parseOptInt(i, argc, argv, rings);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
spokes < 3 || spokes > 64 ||
|
||
rings < 1 || rings > 32) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-spider-web: invalid dims (W/H 1..8192, spokes 3..64, rings 1..32)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, wr, wg, wb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-spider-web")) return 1;
|
||
if (!parseHexOrError(webHex, wr, wg, wb_, "gen-texture-spider-web")) return 1;
|
||
constexpr float kPi = 3.14159265358979323846f;
|
||
const float cx = W * 0.5f;
|
||
const float cy = H * 0.5f;
|
||
// Web extends to the smaller half-extent so it always fits.
|
||
const float maxR = std::min(cx, cy);
|
||
const float spokeStep = 2.0f * kPi / spokes;
|
||
const float ringStep = maxR / rings;
|
||
// Line widths in pixels — kept fixed so the web reads at any
|
||
// image size; users wanting a denser/thicker web can re-run
|
||
// with bigger spoke/ring counts.
|
||
const float lineHalfW = 1.0f;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx = x + 0.5f - cx;
|
||
float dy = y + 0.5f - cy;
|
||
float r = std::sqrt(dx * dx + dy * dy);
|
||
uint8_t cr_, cg_, cb_;
|
||
cr_ = br_; cg_ = bg_; cb_ = bb_;
|
||
if (r > 0.5f && r < maxR + lineHalfW) {
|
||
// Spoke check: angular distance to nearest spoke
|
||
// line, measured as arc length (= r * dTheta) so
|
||
// spokes have constant pixel width regardless of r.
|
||
float theta = std::atan2(dy, dx);
|
||
float wrapped = std::fmod(theta + kPi * 100.0f, spokeStep);
|
||
float spokeDelta = std::min(wrapped, spokeStep - wrapped);
|
||
float arcDist = spokeDelta * r;
|
||
if (arcDist <= lineHalfW) {
|
||
cr_ = wr; cg_ = wg; cb_ = wb_;
|
||
}
|
||
// Ring check: nearest ring radius. Skip the
|
||
// would-be ring at r=0 (which is the center).
|
||
float ringIdx = r / ringStep;
|
||
float nearestRing = std::round(ringIdx) * ringStep;
|
||
if (nearestRing > 0.5f &&
|
||
std::fabs(r - nearestRing) <= lineHalfW) {
|
||
cr_ = wr; cg_ = wg; cb_ = wb_;
|
||
}
|
||
}
|
||
setPixelRGB(pixels, W, x, y, cr_, cg_, cb_);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-spider-web")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d (web center at %.1f, %.1f)\n",
|
||
W, H, cx, cy);
|
||
std::printf(" bg / web : %s / %s\n", bgHex.c_str(), webHex.c_str());
|
||
std::printf(" spokes : %d (every %.1f°)\n",
|
||
spokes, 360.0f / spokes);
|
||
std::printf(" rings : %d (spacing %.1f px)\n",
|
||
rings, ringStep);
|
||
return 0;
|
||
}
|
||
|
||
int handleGingham(int& i, int argc, char** argv) {
|
||
// Gingham: classic picnic-blanket / shirt fabric pattern.
|
||
// Two perpendicular sets of stripes (horizontal + vertical)
|
||
// with a darker color where they cross. The crossing creates
|
||
// the characteristic 3-tone checker that gingham is known
|
||
// for, distinct from --gen-texture-checker (solid blocks).
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string stripeHex = argv[++i];
|
||
std::string crossHex = argv[++i];
|
||
int stripeSpacing = 16;
|
||
int stripeWidth = 8;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stripeSpacing);
|
||
parseOptInt(i, argc, argv, stripeWidth);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stripeSpacing < 4 || stripeSpacing > 256 ||
|
||
stripeWidth < 1 || stripeWidth >= stripeSpacing) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-gingham: invalid dims (W/H 1..8192, spacing 4..256, width 1..spacing-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_, cr_, cg_, cb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-gingham")) return 1;
|
||
if (!parseHexOrError(stripeHex, sr, sg, sb_, "gen-texture-gingham")) return 1;
|
||
if (!parseHexOrError(crossHex, cr_, cg_, cb_, "gen-texture-gingham")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
bool inHStripe = ((y % stripeSpacing) < stripeWidth);
|
||
for (int x = 0; x < W; ++x) {
|
||
bool inVStripe = ((x % stripeSpacing) < stripeWidth);
|
||
uint8_t r, g, b;
|
||
if (inHStripe && inVStripe) {
|
||
// Crossing region: darkest of the three colors.
|
||
r = cr_; g = cg_; b = cb_;
|
||
} else if (inHStripe || inVStripe) {
|
||
// Single-direction stripe band.
|
||
r = sr; g = sg; b = sb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-gingham")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/stripe/cross : %s / %s / %s\n",
|
||
bgHex.c_str(), stripeHex.c_str(), crossHex.c_str());
|
||
std::printf(" spacing : %d px (stripe width %d)\n",
|
||
stripeSpacing, stripeWidth);
|
||
return 0;
|
||
}
|
||
|
||
int handleLattice(int& i, int argc, char** argv) {
|
||
// Lattice: garden trellis — two sets of diagonal lines, one
|
||
// at +45° and one at -45°, drawn simultaneously across the
|
||
// whole image so they form diamond-shaped openings between
|
||
// the lines. Distinct from --gen-texture-herringbone (which
|
||
// alternates strip orientation) — this draws both diagonals
|
||
// at every pixel.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string lineHex = argv[++i];
|
||
int lineSpacing = 24;
|
||
int lineWidth = 3;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, lineSpacing);
|
||
parseOptInt(i, argc, argv, lineWidth);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
lineSpacing < 4 || lineSpacing > 256 ||
|
||
lineWidth < 1 || lineWidth >= lineSpacing) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-lattice: invalid dims (W/H 1..8192, spacing 4..256, width 1..spacing-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, lr, lg, lb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-lattice")) return 1;
|
||
if (!parseHexOrError(lineHex, lr, lg, lb_, "gen-texture-lattice")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// +45° line set: where (x + y) mod spacing is small.
|
||
int posMod = ((x + y) % lineSpacing + lineSpacing) % lineSpacing;
|
||
// -45° line set: where (x - y) mod spacing is small.
|
||
int negMod = ((x - y) % lineSpacing + lineSpacing) % lineSpacing;
|
||
bool onLine = (posMod < lineWidth) || (negMod < lineWidth);
|
||
uint8_t r, g, b;
|
||
if (onLine) {
|
||
r = lr; g = lg; b = lb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-lattice")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / line : %s / %s\n", bgHex.c_str(), lineHex.c_str());
|
||
std::printf(" diagonals : ±45° at %d-px spacing, %d-px width\n",
|
||
lineSpacing, lineWidth);
|
||
return 0;
|
||
}
|
||
|
||
int handleHoneycomb(int& i, int argc, char** argv) {
|
||
// Honeycomb: hexagonal cell tiling. Hex centers sit on a
|
||
// triangular lattice (alternating rows shifted by half a
|
||
// horizontal step); each pixel is classified by which hex
|
||
// center it's nearest to (Voronoi cells of a triangular
|
||
// lattice are perfect hexagons). Pixels near a cell
|
||
// boundary become the border color.
|
||
std::string outPath = argv[++i];
|
||
std::string fillHex = argv[++i];
|
||
std::string borderHex = argv[++i];
|
||
int hexSide = 16; // hex side length in pixels
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, hexSide);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
hexSide < 4 || hexSide > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-honeycomb: invalid dims (W/H 1..8192, hexSide 4..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t fr, fg, fb_, br_, bg_, bb_;
|
||
if (!parseHexOrError(fillHex, fr, fg, fb_, "gen-texture-honeycomb")) return 1;
|
||
if (!parseHexOrError(borderHex, br_, bg_, bb_, "gen-texture-honeycomb")) return 1;
|
||
constexpr float kSqrt3 = 1.7320508075688772f;
|
||
// Pointy-top hex grid: horizontal step = hexSide * sqrt(3),
|
||
// vertical step = hexSide * 1.5; alternate rows shifted by
|
||
// half the horizontal step.
|
||
float hStep = hexSide * kSqrt3;
|
||
float vStep = hexSide * 1.5f;
|
||
// Generate seeds covering the image (with a 2-cell margin
|
||
// on each side so border pixels at the image edge always
|
||
// have a 'second nearest' to compare against).
|
||
struct Seed { float x, y; };
|
||
std::vector<Seed> seeds;
|
||
int rowMin = -2;
|
||
int rowMax = static_cast<int>(H / vStep) + 3;
|
||
int colMin = -2;
|
||
int colMax = static_cast<int>(W / hStep) + 3;
|
||
seeds.reserve((rowMax - rowMin + 1) * (colMax - colMin + 1));
|
||
for (int row = rowMin; row <= rowMax; ++row) {
|
||
float shift = (row & 1) ? hStep * 0.5f : 0.0f;
|
||
for (int col = colMin; col <= colMax; ++col) {
|
||
seeds.push_back({col * hStep + shift, row * vStep});
|
||
}
|
||
}
|
||
// Border ratio: pixels where second-nearest seed is within
|
||
// 1.04x of the nearest become border. Tuned so border is
|
||
// 1-2 px at hexSide=16 and scales naturally with hexSide.
|
||
const float boundaryRatio = 1.04f;
|
||
const float boundaryRatioSq = boundaryRatio * boundaryRatio;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
float fy = static_cast<float>(y);
|
||
for (int x = 0; x < W; ++x) {
|
||
float fx = static_cast<float>(x);
|
||
float bestSq = 1e30f, secondSq = 1e30f;
|
||
for (const auto& s : seeds) {
|
||
float dx = s.x - fx;
|
||
float dy = s.y - fy;
|
||
float d2 = dx * dx + dy * dy;
|
||
if (d2 < bestSq) {
|
||
secondSq = bestSq;
|
||
bestSq = d2;
|
||
} else if (d2 < secondSq) {
|
||
secondSq = d2;
|
||
}
|
||
}
|
||
float ratioSq = (bestSq > 0.0f) ? secondSq / bestSq : 1e30f;
|
||
uint8_t r, g, b;
|
||
if (ratioSq < boundaryRatioSq) {
|
||
r = br_; g = bg_; b = bb_;
|
||
} else {
|
||
r = fr; g = fg; b = fb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-honeycomb")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" fill / border : %s / %s\n",
|
||
fillHex.c_str(), borderHex.c_str());
|
||
std::printf(" hex side : %d px (%zu seeds total)\n",
|
||
hexSide, seeds.size());
|
||
return 0;
|
||
}
|
||
|
||
int handleCracked(int& i, int argc, char** argv) {
|
||
// Cracked: organic crack network done via recursive random
|
||
// walks from N seed nuclei. Each seed spawns a crack that
|
||
// walks in a random direction for some length, then with
|
||
// 60% chance branches into one or two more cracks of
|
||
// shorter length. Result: irregular fissures that read as
|
||
// cracked mud, dry earth, broken glass, weathered stone.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string crackHex = argv[++i];
|
||
int seedCount = 12;
|
||
int maxLength = 40;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, seedCount);
|
||
parseOptInt(i, argc, argv, maxLength);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
seedCount < 1 || seedCount > 4096 ||
|
||
maxLength < 4 || maxLength > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-cracked: invalid dims (W/H 1..8192, seeds 1..4096, maxLen 4..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, cr_, cg_, cb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-cracked")) return 1;
|
||
if (!parseHexOrError(crackHex, cr_, cg_, cb_, "gen-texture-cracked")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (size_t p = 0; p < pixels.size(); p += 3) {
|
||
pixels[p + 0] = br_;
|
||
pixels[p + 1] = bg_;
|
||
pixels[p + 2] = bb_;
|
||
}
|
||
// Deterministic LCG so re-runs reproduce the same pattern.
|
||
uint32_t rng = static_cast<uint32_t>(seedCount) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu +
|
||
static_cast<uint32_t>(maxLength);
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
auto next01 = [&]() { return (rngStep() & 0xFFFFFF) / float(0x1000000); };
|
||
auto paintPixel = [&](int x, int y) {
|
||
if (x < 0 || x >= W || y < 0 || y >= H) return;
|
||
setPixelRGB(pixels, W, x, y, cr_, cg_, cb_);
|
||
};
|
||
constexpr float kPi = 3.14159265358979323846f;
|
||
// Iterative DFS instead of true recursion so we don't blow
|
||
// the stack on long branching chains.
|
||
struct Crack { float x, y; int remaining; };
|
||
std::vector<Crack> stack;
|
||
for (int s = 0; s < seedCount; ++s) {
|
||
Crack seed;
|
||
seed.x = next01() * W;
|
||
seed.y = next01() * H;
|
||
seed.remaining = maxLength;
|
||
stack.push_back(seed);
|
||
}
|
||
while (!stack.empty()) {
|
||
Crack c = stack.back();
|
||
stack.pop_back();
|
||
if (c.remaining <= 0) continue;
|
||
// Pick a random direction (any angle) and a per-segment
|
||
// length up to remaining.
|
||
float angle = next01() * 2.0f * kPi;
|
||
float dx = std::cos(angle);
|
||
float dy = std::sin(angle);
|
||
int segLen = 4 + static_cast<int>(next01() * (c.remaining - 4));
|
||
float fx = c.x, fy = c.y;
|
||
for (int t = 0; t < segLen; ++t) {
|
||
paintPixel(static_cast<int>(fx), static_cast<int>(fy));
|
||
fx += dx;
|
||
fy += dy;
|
||
}
|
||
// Branching: 60% chance the segment endpoint spawns 1
|
||
// more crack of half-remaining length, 25% chance it
|
||
// spawns 2 (so most cracks die out, a few network).
|
||
float branchRoll = next01();
|
||
int branches = (branchRoll < 0.25f) ? 2 :
|
||
(branchRoll < 0.85f) ? 1 : 0;
|
||
for (int b = 0; b < branches; ++b) {
|
||
stack.push_back({fx, fy, c.remaining / 2});
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-cracked")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / crack : %s / %s\n", bgHex.c_str(), crackHex.c_str());
|
||
std::printf(" seeds : %d (max length %d, branching DFS)\n",
|
||
seedCount, maxLength);
|
||
return 0;
|
||
}
|
||
|
||
int handleRunes(int& i, int argc, char** argv) {
|
||
// Runes: magical glyphs scattered on a textured background.
|
||
// Each rune is 3-5 random line segments emanating from a
|
||
// center point; segments use 8 cardinal/diagonal angles
|
||
// (0°, 45°, 90°, ...) so the strokes read as deliberate
|
||
// angular runes rather than random scribbles. Layout is a
|
||
// sparse grid with per-rune jitter so they look hand-carved.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string runeHex = argv[++i];
|
||
int gridSpacing = 64; // rune slot size
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, gridSpacing);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
gridSpacing < 16 || gridSpacing > 512) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-runes: invalid dims (W/H 1..8192, gridSpacing 16..512)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-runes")) return 1;
|
||
if (!parseHexOrError(runeHex, rr_, rg_, rb_, "gen-texture-runes")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (size_t p = 0; p < pixels.size(); p += 3) {
|
||
pixels[p + 0] = br_;
|
||
pixels[p + 1] = bg_;
|
||
pixels[p + 2] = bb_;
|
||
}
|
||
auto paint = [&](int x, int y) {
|
||
if (x < 0 || x >= W || y < 0 || y >= H) return;
|
||
setPixelRGB(pixels, W, x, y, rr_, rg_, rb_);
|
||
};
|
||
auto drawLine = [&](int x0, int y0, int x1, int y1) {
|
||
// Bresenham. Pixels paint with the rune color.
|
||
int dx = std::abs(x1 - x0), sx = x0 < x1 ? 1 : -1;
|
||
int dy = -std::abs(y1 - y0), sy = y0 < y1 ? 1 : -1;
|
||
int err = dx + dy;
|
||
while (true) {
|
||
paint(x0, y0);
|
||
if (x0 == x1 && y0 == y1) break;
|
||
int e2 = 2 * err;
|
||
if (e2 >= dy) { err += dy; x0 += sx; }
|
||
if (e2 <= dx) { err += dx; y0 += sy; }
|
||
}
|
||
};
|
||
// 8 cardinal/diagonal direction unit vectors.
|
||
static const int kDir[8][2] = {
|
||
{ 1, 0}, { 1, 1}, {0, 1}, {-1, 1},
|
||
{-1, 0}, {-1,-1}, {0, -1}, { 1, -1},
|
||
};
|
||
// Rune slot grid. Each slot gets a single rune centered
|
||
// (with jitter) inside it.
|
||
int slotR = gridSpacing / 2;
|
||
uint32_t rng = static_cast<uint32_t>(gridSpacing) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu;
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
int runeRadius = slotR / 3; // half-length of each stroke
|
||
int jitterMax = slotR / 4;
|
||
int runeCount = 0;
|
||
for (int sy = slotR; sy < H + slotR; sy += gridSpacing) {
|
||
for (int sx = slotR; sx < W + slotR; sx += gridSpacing) {
|
||
// Per-rune jitter so the layout doesn't look like a
|
||
// perfect grid; 5% of slots are skipped (empty
|
||
// ground between runes).
|
||
if ((rngStep() & 0xFF) < 13) continue; // ~5% skip
|
||
int cx = sx + (static_cast<int>(rngStep() & 0xFF) - 128) *
|
||
jitterMax / 128;
|
||
int cy = sy + (static_cast<int>(rngStep() & 0xFF) - 128) *
|
||
jitterMax / 128;
|
||
// 3-5 strokes per rune.
|
||
int strokeCount = 3 + (rngStep() % 3);
|
||
for (int s = 0; s < strokeCount; ++s) {
|
||
int dirA = rngStep() & 7;
|
||
int dirB = rngStep() & 7;
|
||
int lenA = runeRadius * (40 + static_cast<int>(rngStep() % 60)) / 100;
|
||
int lenB = runeRadius * (40 + static_cast<int>(rngStep() % 60)) / 100;
|
||
int x0 = cx + kDir[dirA][0] * lenA;
|
||
int y0 = cy + kDir[dirA][1] * lenA;
|
||
int x1 = cx + kDir[dirB][0] * lenB;
|
||
int y1 = cy + kDir[dirB][1] * lenB;
|
||
drawLine(x0, y0, x1, y1);
|
||
}
|
||
runeCount++;
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-runes")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / rune : %s / %s\n", bgHex.c_str(), runeHex.c_str());
|
||
std::printf(" runes : %d (slot %d px, 3-5 strokes each)\n",
|
||
runeCount, gridSpacing);
|
||
return 0;
|
||
}
|
||
|
||
int handleLeopard(int& i, int argc, char** argv) {
|
||
// Leopard print: irregular spots scattered across a tan
|
||
// background. Each spot is the union of 3-4 small
|
||
// overlapping sub-circles at slightly offset positions —
|
||
// gives spots an organic non-circular silhouette without
|
||
// needing per-spot polygon authoring. Two colors total
|
||
// (background + spot) for the classic leopard look.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string spotHex = argv[++i];
|
||
int spotCount = 60;
|
||
int spotRadius = 8;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, spotCount);
|
||
parseOptInt(i, argc, argv, spotRadius);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
spotCount < 1 || spotCount > 4096 ||
|
||
spotRadius < 2 || spotRadius > 256) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-leopard: invalid dims (W/H 1..8192, spots 1..4096, radius 2..256)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr_, sg_, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-leopard")) return 1;
|
||
if (!parseHexOrError(spotHex, sr_, sg_, sb_, "gen-texture-leopard")) return 1;
|
||
// Each spot is composed of 4 sub-circles. Pre-generate the
|
||
// spot list so we can do a single pass per pixel.
|
||
struct Spot {
|
||
int cx[4], cy[4]; // sub-circle centers
|
||
int rSq; // squared radius (shared)
|
||
};
|
||
std::vector<Spot> spots;
|
||
spots.reserve(spotCount);
|
||
uint32_t rng = static_cast<uint32_t>(spotCount) * 0x9E3779B9u +
|
||
static_cast<uint32_t>(W) * 0x85EBCA6Bu +
|
||
static_cast<uint32_t>(spotRadius);
|
||
auto rngStep = [&]() {
|
||
rng ^= rng << 13; rng ^= rng >> 17; rng ^= rng << 5;
|
||
return rng;
|
||
};
|
||
for (int s = 0; s < spotCount; ++s) {
|
||
Spot sp;
|
||
// Sub-circle radius is 60% of nominal so the union
|
||
// approximates a single spot of approximately the
|
||
// requested radius.
|
||
int subR = std::max(2, spotRadius * 6 / 10);
|
||
sp.rSq = subR * subR;
|
||
// Spot center placed uniformly across the image with a
|
||
// half-radius padding so most spots stay inside.
|
||
int sx = static_cast<int>((rngStep() & 0xFFFF) / 65535.0f * W);
|
||
int sy = static_cast<int>((rngStep() & 0xFFFF) / 65535.0f * H);
|
||
// Sub-circles offset by up to 0.5 * spotRadius from
|
||
// the spot center, in 4 quadrants. Per-spot jitter
|
||
// makes them irregular.
|
||
int jitter = spotRadius / 2;
|
||
for (int k = 0; k < 4; ++k) {
|
||
int dx = static_cast<int>((rngStep() & 0xFF) - 128) * jitter / 128;
|
||
int dy = static_cast<int>((rngStep() & 0xFF) - 128) * jitter / 128;
|
||
sp.cx[k] = sx + dx;
|
||
sp.cy[k] = sy + dy;
|
||
}
|
||
spots.push_back(sp);
|
||
}
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (size_t p = 0; p < pixels.size(); p += 3) {
|
||
pixels[p + 0] = br_;
|
||
pixels[p + 1] = bg_;
|
||
pixels[p + 2] = bb_;
|
||
}
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Inside any spot if any sub-circle covers (x, y).
|
||
bool inSpot = false;
|
||
for (const auto& sp : spots) {
|
||
for (int k = 0; k < 4 && !inSpot; ++k) {
|
||
int dx = sp.cx[k] - x;
|
||
int dy = sp.cy[k] - y;
|
||
if (dx * dx + dy * dy <= sp.rSq) inSpot = true;
|
||
}
|
||
if (inSpot) break;
|
||
}
|
||
if (inSpot) {
|
||
setPixelRGB(pixels, W, x, y, sr_, sg_, sb_);
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-leopard")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg / spot : %s / %s\n", bgHex.c_str(), spotHex.c_str());
|
||
std::printf(" spots : %d (radius ~%d, 4 sub-circles each)\n",
|
||
spotCount, spotRadius);
|
||
return 0;
|
||
}
|
||
|
||
int handleZebra(int& i, int argc, char** argv) {
|
||
// Zebra: wavy parallel stripes. The base stripes run
|
||
// horizontally; a sinusoidal y-shift in x makes them
|
||
// undulate, producing the characteristic non-straight
|
||
// zebra look without lining up perfectly with the row
|
||
// grid. Two-color (bg + stripe) for the iconic black-on-
|
||
// white animal-print effect.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string stripeHex = argv[++i];
|
||
int stripePeriod = 24; // stripe + gap together
|
||
int amplitude = 8; // sine-wave amplitude (px)
|
||
int wavelength = 80; // x-period of the sine wave (px)
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stripePeriod);
|
||
parseOptInt(i, argc, argv, amplitude);
|
||
parseOptInt(i, argc, argv, wavelength);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stripePeriod < 4 || stripePeriod > 256 ||
|
||
amplitude < 0 || amplitude > 128 ||
|
||
wavelength < 8 || wavelength > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-zebra: invalid dims (W/H 1..8192, period 4..256, "
|
||
"amplitude 0..128, wavelength 8..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-zebra")) return 1;
|
||
if (!parseHexOrError(stripeHex, sr, sg, sb_, "gen-texture-zebra")) return 1;
|
||
constexpr float kPi = 3.14159265358979323846f;
|
||
const float twoPi = 2.0f * kPi;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
int halfPeriod = stripePeriod / 2; // each stripe = half the period
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Apply sine perturbation to the row index. Each
|
||
// column gets a y-shift based on cos(x * 2π/wavelength).
|
||
float shift = amplitude * std::sin(x * twoPi / wavelength);
|
||
int adjY = y + static_cast<int>(shift);
|
||
int phase = ((adjY % stripePeriod) + stripePeriod) % stripePeriod;
|
||
uint8_t r, g, b;
|
||
if (phase < halfPeriod) {
|
||
r = sr; g = sg; b = sb_; // stripe
|
||
} else {
|
||
r = br_; g = bg_; b = bb_; // bg
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-zebra")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/stripe : %s / %s\n", bgHex.c_str(), stripeHex.c_str());
|
||
std::printf(" stripes : period %d (amplitude %d, wavelength %d px)\n",
|
||
stripePeriod, amplitude, wavelength);
|
||
return 0;
|
||
}
|
||
|
||
int handleKnit(int& i, int argc, char** argv) {
|
||
// Knit: V-stitch pattern. Each stitch occupies a cellW x cellH
|
||
// cell; the stitch is the V-shape made by two diagonal strokes
|
||
// meeting at the apex (cellW/2, 0) and dropping to the cell's
|
||
// bottom corners. Cells tile contiguously in both axes, giving
|
||
// the iconic chevron-zigzag look of knitted fabric.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string stitchHex = argv[++i];
|
||
int cellW = 16;
|
||
int cellH = 12;
|
||
int strokeWidth = 2;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellW);
|
||
parseOptInt(i, argc, argv, cellH);
|
||
parseOptInt(i, argc, argv, strokeWidth);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellW < 4 || cellW > 256 ||
|
||
cellH < 4 || cellH > 256 ||
|
||
strokeWidth < 1 || strokeWidth >= cellH) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-knit: invalid dims (W/H 1..8192, cellW/H 4..256, "
|
||
"strokeWidth 1..cellH-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-knit")) return 1;
|
||
if (!parseHexOrError(stitchHex, sr, sg, sb_, "gen-texture-knit")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Slope of each V stroke: rise (cellH) over run (cellW/2)
|
||
// gives slope = 2*cellH/cellW. Vertical strokeWidth in pixels
|
||
// measures how far the pixel is from the ideal stroke line.
|
||
const float slope = 2.0f * cellH / static_cast<float>(cellW);
|
||
for (int y = 0; y < H; ++y) {
|
||
int localY = y % cellH;
|
||
for (int x = 0; x < W; ++x) {
|
||
int localX = x % cellW;
|
||
// Distance from stitch apex along x.
|
||
int d = std::abs(localX - cellW / 2);
|
||
float expectedY = d * slope;
|
||
// Pixel is "stitch" if its localY is within strokeWidth
|
||
// of the V stroke's expected y at this x.
|
||
uint8_t r, g, b;
|
||
if (std::fabs(localY - expectedY) < strokeWidth) {
|
||
r = sr; g = sg; b = sb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-knit")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/stitch : %s / %s\n", bgHex.c_str(), stitchHex.c_str());
|
||
std::printf(" stitch : %dx%d (stroke %d px)\n",
|
||
cellW, cellH, strokeWidth);
|
||
return 0;
|
||
}
|
||
|
||
int handleRustStreaks(int& i, int argc, char** argv) {
|
||
// Vertical rust drips on a metal base. Each streak is a
|
||
// vertical band of varying width (hash-derived) starting at a
|
||
// hash-jittered top position and fading toward bgHex over its
|
||
// length. Distinct from --gen-texture-rust (generic rough
|
||
// surface noise) — this is the "drip-line" variant for
|
||
// weathered metal walls, sewer-grate backings, ship-hull
|
||
// stains, abandoned-machinery details.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string rustHex = argv[++i];
|
||
int streakCount = 40;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, streakCount);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
streakCount < 1 || streakCount > 4096) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rust-streaks: invalid dims (W/H 1..8192, "
|
||
"streakCount 1..4096)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_,
|
||
"gen-texture-rust-streaks")) return 1;
|
||
if (!parseHexOrError(rustHex, rr_, rg_, rb_,
|
||
"gen-texture-rust-streaks")) return 1;
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
// Pre-compute streak parameters: x position, width, top y,
|
||
// length. All hash-derived from streak index + seed so the
|
||
// result is deterministic for a given seed.
|
||
struct Streak {
|
||
int x;
|
||
int width;
|
||
int top;
|
||
int length;
|
||
};
|
||
std::vector<Streak> streaks(streakCount);
|
||
for (int k = 0; k < streakCount; ++k) {
|
||
uint32_t h = hash32(static_cast<uint32_t>(k) + seed);
|
||
streaks[k].x = static_cast<int>(h % W);
|
||
streaks[k].width = 1 + static_cast<int>((h >> 8) % 4); // 1..4
|
||
streaks[k].top = static_cast<int>((h >> 12) % H);
|
||
streaks[k].length = static_cast<int>(H / 3 + (h >> 16) % (2 * H / 3));
|
||
}
|
||
// Init pixels to bg.
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
setPixelRGB(pixels, W, x, y, br_, bg_, bb_);
|
||
}
|
||
}
|
||
// Paint each streak.
|
||
for (const auto& s : streaks) {
|
||
for (int dy = 0; dy < s.length; ++dy) {
|
||
int y = s.top + dy;
|
||
if (y < 0 || y >= H) continue;
|
||
// Fade: full strength at top, zero at bottom.
|
||
float frac = 1.0f - static_cast<float>(dy) / s.length;
|
||
for (int dx = -s.width / 2; dx <= s.width / 2; ++dx) {
|
||
int x = s.x + dx;
|
||
if (x < 0 || x >= W) continue;
|
||
std::size_t idx =
|
||
(static_cast<std::size_t>(y) * W + x) * 3;
|
||
pixels[idx + 0] = static_cast<uint8_t>(
|
||
pixels[idx + 0] + (rr_ - pixels[idx + 0]) * frac);
|
||
pixels[idx + 1] = static_cast<uint8_t>(
|
||
pixels[idx + 1] + (rg_ - pixels[idx + 1]) * frac);
|
||
pixels[idx + 2] = static_cast<uint8_t>(
|
||
pixels[idx + 2] + (rb_ - pixels[idx + 2]) * frac);
|
||
}
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels,
|
||
"gen-texture-rust-streaks")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/rust : %s / %s\n", bgHex.c_str(), rustHex.c_str());
|
||
std::printf(" streaks : %d (seed %u)\n", streakCount, seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleBlueprint(int& i, int argc, char** argv) {
|
||
// Blueprint / engineer's grid: minor grid lines at every
|
||
// `minorStride` pixels with a thicker major line every
|
||
// `majorEvery` steps. The major lines repeat in both axes so
|
||
// the image reads as a sectioned drafting paper. Distinct
|
||
// from --gen-texture-mesh-screen (which has uniform line
|
||
// weight) — this is the periodic-emphasis variant for
|
||
// technical/architectural surfaces.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string lineHex = argv[++i];
|
||
int minorStride = 16;
|
||
int majorEvery = 4; // every 4 minor lines is a major line
|
||
int minorW = 1;
|
||
int majorW = 2;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, minorStride);
|
||
parseOptInt(i, argc, argv, majorEvery);
|
||
parseOptInt(i, argc, argv, minorW);
|
||
parseOptInt(i, argc, argv, majorW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
minorStride < 2 || minorStride > 1024 ||
|
||
majorEvery < 1 || majorEvery > 64 ||
|
||
minorW < 1 || minorW * 2 >= minorStride ||
|
||
majorW < minorW || majorW * 2 >= minorStride) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-blueprint: invalid dims (W/H 1..8192, "
|
||
"minorStride 2..1024, majorEvery 1..64, "
|
||
"minorW 1..stride/2, majorW minorW..stride/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, lr, lg, lb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_,
|
||
"gen-texture-blueprint")) return 1;
|
||
if (!parseHexOrError(lineHex, lr, lg, lb_,
|
||
"gen-texture-blueprint")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
int yLine = y / minorStride;
|
||
int yRem = y - yLine * minorStride;
|
||
bool yIsMajor = (yLine % majorEvery == 0) && (yRem < majorW);
|
||
bool yIsMinor = (yRem < minorW);
|
||
for (int x = 0; x < W; ++x) {
|
||
int xLine = x / minorStride;
|
||
int xRem = x - xLine * minorStride;
|
||
bool xIsMajor = (xLine % majorEvery == 0) && (xRem < majorW);
|
||
bool xIsMinor = (xRem < minorW);
|
||
uint8_t r, g, b;
|
||
if (xIsMajor || yIsMajor || xIsMinor || yIsMinor) {
|
||
r = lr; g = lg; b = lb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels,
|
||
"gen-texture-blueprint")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/line : %s / %s\n", bgHex.c_str(), lineHex.c_str());
|
||
std::printf(" minor : stride=%d, W=%d\n", minorStride, minorW);
|
||
std::printf(" major : every %d, W=%d\n", majorEvery, majorW);
|
||
return 0;
|
||
}
|
||
|
||
int handleBamboo(int& i, int argc, char** argv) {
|
||
// Bamboo: vertical stalks with cylindrical sin² shading and
|
||
// horizontal node bands at regular Y intervals. Each stalk
|
||
// gets a small hash-derived hue jitter so adjacent stalks
|
||
// don't read as a perfect repeat. Useful for jungle huts,
|
||
// pandaren / asian-themed architecture, swamp boardwalks,
|
||
// tropical-tribe weapon trim.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string bambooHex = argv[++i];
|
||
int stalkW = 24; // horizontal stalk pitch
|
||
int nodeY = 64; // vertical spacing between nodes
|
||
int nodeBand = 4; // pixel height of each node band
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stalkW);
|
||
parseOptInt(i, argc, argv, nodeY);
|
||
parseOptInt(i, argc, argv, nodeBand);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stalkW < 4 || stalkW > 1024 ||
|
||
nodeY < 8 || nodeY > 4096 ||
|
||
nodeBand < 1 || nodeBand >= nodeY) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bamboo: invalid dims (W/H 1..8192, stalkW 4..1024, "
|
||
"nodeY 8..4096, nodeBand 1..nodeY-1)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-bamboo")) return 1;
|
||
if (!parseHexOrError(bambooHex, sr, sg, sb_,
|
||
"gen-texture-bamboo")) return 1;
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float pi = 3.14159265358979f;
|
||
const float gapFrac = 0.10f; // 10% horizontal gap between stalks
|
||
const float stalkFrac = 1.0f - gapFrac;
|
||
for (int y = 0; y < H; ++y) {
|
||
// Node band test: a horizontal stripe darker than the
|
||
// surrounding stalk every nodeY pixels.
|
||
bool inNode = (y % nodeY) < nodeBand;
|
||
for (int x = 0; x < W; ++x) {
|
||
int stalkIdx = x / stalkW;
|
||
int xLocal = x - stalkIdx * stalkW;
|
||
float xNorm = xLocal / static_cast<float>(stalkW);
|
||
// Inside-stalk region runs xNorm in [gapFrac/2, 1-gapFrac/2].
|
||
float inset = (xNorm - gapFrac * 0.5f) / stalkFrac;
|
||
uint8_t r, g, b;
|
||
if (inset < 0.0f || inset > 1.0f) {
|
||
r = br_; g = bg_; b = bb_;
|
||
} else {
|
||
// sin² brightness across stalk width = round highlight.
|
||
float bright = std::sin(inset * pi);
|
||
bright = bright * bright;
|
||
// Per-stalk tint jitter ±15.
|
||
int tint = (static_cast<int>(hash32(stalkIdx + seed) % 31)) - 15;
|
||
auto clamp = [](int v) {
|
||
return v < 0 ? 0 : (v > 255 ? 255 : v);
|
||
};
|
||
int rr = clamp(static_cast<int>(sr * bright) + tint);
|
||
int gg = clamp(static_cast<int>(sg * bright) + tint);
|
||
int bb2 = clamp(static_cast<int>(sb_ * bright) + tint);
|
||
if (inNode) {
|
||
// Node bands are darker — knock brightness down.
|
||
rr = rr * 2 / 3;
|
||
gg = gg * 2 / 3;
|
||
bb2 = bb2 * 2 / 3;
|
||
}
|
||
r = static_cast<uint8_t>(rr);
|
||
g = static_cast<uint8_t>(gg);
|
||
b = static_cast<uint8_t>(bb2);
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-bamboo")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/bamboo : %s / %s\n", bgHex.c_str(), bambooHex.c_str());
|
||
std::printf(" stalks : pitch=%d, nodeY=%d (%d-px band), seed=%u\n",
|
||
stalkW, nodeY, nodeBand, seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleMeshScreen(int& i, int argc, char** argv) {
|
||
// Orthogonal mesh-screen / grille: thin horizontal + vertical
|
||
// wires forming an axis-aligned grid. Distinct from
|
||
// --gen-texture-lattice (which uses ±45° diagonals to make
|
||
// diamond openings) — this is the right-angle window-screen /
|
||
// chain-link / sci-fi-grille look.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string wireHex = argv[++i];
|
||
int stride = 12;
|
||
int wireW = 2;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stride);
|
||
parseOptInt(i, argc, argv, wireW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stride < 2 || stride > 1024 ||
|
||
wireW < 1 || wireW * 2 >= stride) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-mesh-screen: invalid dims (W/H 1..8192, "
|
||
"stride 2..1024, wireW 1..stride/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, wr, wg, wb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_,
|
||
"gen-texture-mesh-screen")) return 1;
|
||
if (!parseHexOrError(wireHex, wr, wg, wb_,
|
||
"gen-texture-mesh-screen")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
bool yOnWire = (y % stride) < wireW;
|
||
for (int x = 0; x < W; ++x) {
|
||
bool xOnWire = (x % stride) < wireW;
|
||
uint8_t r, g, b;
|
||
if (xOnWire || yOnWire) {
|
||
r = wr; g = wg; b = wb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels,
|
||
"gen-texture-mesh-screen")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/wire : %s / %s\n", bgHex.c_str(), wireHex.c_str());
|
||
std::printf(" grid : stride=%d, wireW=%d\n", stride, wireW);
|
||
return 0;
|
||
}
|
||
|
||
int handleSnakeSkin(int& i, int argc, char** argv) {
|
||
// Snake skin: brick-offset grid of diamond-shaped scales.
|
||
// Each scale is a rotated square in L1 (taxicab) metric so
|
||
// |dx|/halfW + |dy|/halfH < 1 inside the diamond. Adjacent
|
||
// scales touch tangentially via the row-offset trick (every
|
||
// odd row shifted by halfW). A thin dark outline around each
|
||
// diamond gives definition. Distinct from --gen-texture-scales
|
||
// (overlapping circles) and --gen-texture-chainmail (rings).
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string scaleHex = argv[++i];
|
||
int cellW = 24;
|
||
int cellH = 16;
|
||
int outlineW = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellW);
|
||
parseOptInt(i, argc, argv, cellH);
|
||
parseOptInt(i, argc, argv, outlineW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellW < 4 || cellW > 1024 ||
|
||
cellH < 4 || cellH > 1024 ||
|
||
outlineW < 0 || outlineW * 2 >= std::min(cellW, cellH)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-snake-skin: invalid dims (W/H 1..8192, "
|
||
"cellW/H 4..1024, outlineW 0..min(cellW,cellH)/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_,
|
||
"gen-texture-snake-skin")) return 1;
|
||
if (!parseHexOrError(scaleHex, sr, sg, sb_,
|
||
"gen-texture-snake-skin")) return 1;
|
||
// Outline color: scaleHex × 0.4 (darkened version).
|
||
uint8_t outR = static_cast<uint8_t>(sr * 2 / 5);
|
||
uint8_t outG = static_cast<uint8_t>(sg * 2 / 5);
|
||
uint8_t outB = static_cast<uint8_t>(sb_ * 2 / 5);
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float halfW = cellW * 0.5f;
|
||
const float halfH = cellH * 0.5f;
|
||
const float outlineFrac = 1.0f - outlineW / std::min(halfW, halfH);
|
||
for (int y = 0; y < H; ++y) {
|
||
int row = y / cellH;
|
||
float rowOffset = (row & 1) ? halfW : 0.0f;
|
||
float cy = (row + 0.5f) * cellH;
|
||
for (int x = 0; x < W; ++x) {
|
||
float xOff = x - rowOffset;
|
||
int col = static_cast<int>(std::floor(xOff / cellW));
|
||
float cx = (col + 0.5f) * cellW + rowOffset;
|
||
float dx = std::abs(x - cx) / halfW;
|
||
float dy = std::abs(y - cy) / halfH;
|
||
float d = dx + dy; // L1 (diamond) metric
|
||
uint8_t r, g, b;
|
||
if (d > 1.0f) {
|
||
r = br_; g = bg_; b = bb_;
|
||
} else if (outlineW > 0 && d > outlineFrac) {
|
||
r = outR; g = outG; b = outB;
|
||
} else {
|
||
r = sr; g = sg; b = sb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels,
|
||
"gen-texture-snake-skin")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/scale : %s / %s\n", bgHex.c_str(), scaleHex.c_str());
|
||
std::printf(" diamond : %dx%d (outline %d px)\n",
|
||
cellW, cellH, outlineW);
|
||
return 0;
|
||
}
|
||
|
||
int handleCamo(int& i, int argc, char** argv) {
|
||
// Camouflage: 2-octave value noise thresholded into hard
|
||
// bg/fg blobs. Distinct from --gen-texture-noise-color (which
|
||
// smoothly lerps between the two colors): camo uses sharp
|
||
// edges to read as a real woodland-disruption pattern, like
|
||
// ghillie suits and military uniforms. Larger features come
|
||
// from the low-frequency octave; finer mottling from the
|
||
// higher octave.
|
||
std::string outPath = argv[++i];
|
||
std::string aHex = argv[++i]; // dominant color
|
||
std::string bHex = argv[++i]; // accent blob color
|
||
int cellSize = 32; // low-frequency lattice in px
|
||
float threshold = 0.5f;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellSize);
|
||
parseOptFloat(i, argc, argv, threshold);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellSize < 4 || cellSize > 1024 ||
|
||
threshold <= 0.0f || threshold >= 1.0f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-camo: invalid dims (W/H 1..8192, "
|
||
"cellSize 4..1024, threshold (0,1))\n");
|
||
return 1;
|
||
}
|
||
uint8_t ar, ag, ab, br_, bg_, bb_;
|
||
if (!parseHexOrError(aHex, ar, ag, ab, "gen-texture-camo")) return 1;
|
||
if (!parseHexOrError(bHex, br_, bg_, bb_, "gen-texture-camo")) return 1;
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
auto latticeNoise = [&](int x, int y, int cell, uint32_t s) -> float {
|
||
// Sample bilinear value noise on a `cell`-pixel lattice.
|
||
int lx = x / cell, ly = y / cell;
|
||
float fx = (x - lx * cell) / static_cast<float>(cell);
|
||
float fy = (y - ly * cell) / static_cast<float>(cell);
|
||
auto sample = [&](int gx, int gy) {
|
||
uint32_t h = hash32(static_cast<uint32_t>(gx) * 0x9E3779B1u
|
||
^ static_cast<uint32_t>(gy) * 0x85EBCA77u
|
||
^ s);
|
||
return (h % 1000) / 999.0f;
|
||
};
|
||
float v00 = sample(lx, ly);
|
||
float v10 = sample(lx + 1, ly);
|
||
float v01 = sample(lx, ly + 1);
|
||
float v11 = sample(lx + 1, ly + 1);
|
||
// Smoothstep weights for natural-looking blobs.
|
||
float u = fx * fx * (3.0f - 2.0f * fx);
|
||
float v = fy * fy * (3.0f - 2.0f * fy);
|
||
return (v00 * (1 - u) + v10 * u) * (1 - v) +
|
||
(v01 * (1 - u) + v11 * u) * v;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const int fineCell = std::max(2, cellSize / 4);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Sum the two octaves: large blobs at full weight,
|
||
// fine mottling at 0.4× weight.
|
||
float v = 0.7f * latticeNoise(x, y, cellSize, seed)
|
||
+ 0.3f * latticeNoise(x, y, fineCell, seed ^ 0xA5A5A5A5u);
|
||
uint8_t r, g, b;
|
||
if (v >= threshold) { r = br_; g = bg_; b = bb_; }
|
||
else { r = ar; g = ag; b = ab; }
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-camo")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" a / b : %s / %s\n", aHex.c_str(), bHex.c_str());
|
||
std::printf(" blobs : cell=%d, threshold=%.2f, seed=%u\n",
|
||
cellSize, threshold, seed);
|
||
return 0;
|
||
}
|
||
|
||
int handlePinstripe(int& i, int argc, char** argv) {
|
||
// Pinstripe: thin vertical lines at every `stride` x position,
|
||
// with optional thicker "feature" line every Nth stripe so the
|
||
// pattern reads as a real pinstripe (the periodic emphasis is
|
||
// what distinguishes it from --gen-texture-stripes which uses
|
||
// wide alternating bands). Useful for noble-house tabards,
|
||
// formal-attire fabric, sci-fi panel detailing, banker's
|
||
// counter cloth.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string lineHex = argv[++i];
|
||
int stride = 12;
|
||
int lineW = 1;
|
||
int featureEvery = 6; // every Nth stripe is a thicker feature line
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stride);
|
||
parseOptInt(i, argc, argv, lineW);
|
||
parseOptInt(i, argc, argv, featureEvery);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stride < 2 || stride > 1024 ||
|
||
lineW < 1 || lineW * 2 >= stride ||
|
||
featureEvery < 0 || featureEvery > 64) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-pinstripe: invalid dims (W/H 1..8192, "
|
||
"stride 2..1024, lineW 1..stride/2, featureEvery 0..64)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, lr, lg, lb;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-pinstripe")) return 1;
|
||
if (!parseHexOrError(lineHex, lr, lg, lb, "gen-texture-pinstripe")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const int featureW = lineW * 2; // feature line is 2× normal width
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
int colIdx = x / stride;
|
||
int xLocal = x - colIdx * stride;
|
||
// Center the line within its column.
|
||
int center = stride / 2;
|
||
int dist = std::abs(xLocal - center);
|
||
int targetW = (featureEvery > 0 && (colIdx % featureEvery) == 0)
|
||
? featureW : lineW;
|
||
uint8_t r, g, b;
|
||
if (dist < (targetW + 1) / 2) {
|
||
r = lr; g = lg; b = lb;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-pinstripe")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/line : %s / %s\n", bgHex.c_str(), lineHex.c_str());
|
||
std::printf(" stripes : stride=%d, lineW=%d, featureEvery=%d\n",
|
||
stride, lineW, featureEvery);
|
||
return 0;
|
||
}
|
||
|
||
int handleCarbon(int& i, int argc, char** argv) {
|
||
// Carbon-fiber weave: 2x2 cells where alternating cells hold
|
||
// horizontal vs vertical fiber segments. Each segment has a
|
||
// sin² brightness profile across its perpendicular axis,
|
||
// simulating the rounded highlight on a real woven fiber bundle.
|
||
// Useful for sci-fi armor, sleek tech panels, hi-tech vehicle
|
||
// bodies, ritual obsidian inlays, or any "machined composite"
|
||
// surface where a flat color would read as plastic.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string fibHex = argv[++i];
|
||
int cellSize = 12;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellSize);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellSize < 2 || cellSize > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-carbon: invalid dims (W/H 1..8192, "
|
||
"cellSize 2..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, fr, fg, fb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-carbon")) return 1;
|
||
if (!parseHexOrError(fibHex, fr, fg, fb_, "gen-texture-carbon")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float pi = 3.14159265358979f;
|
||
const float invCell = 1.0f / cellSize;
|
||
for (int y = 0; y < H; ++y) {
|
||
int cy = y / cellSize;
|
||
int ly = y - cy * cellSize;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx = x / cellSize;
|
||
int lx = x - cx * cellSize;
|
||
// (cx + cy) parity determines fiber orientation.
|
||
// Brightness profile is sin² of the perpendicular
|
||
// local coord normalized to [0, π].
|
||
bool horiz = ((cx + cy) & 1) == 0;
|
||
float perp = horiz ? (ly * invCell) : (lx * invCell);
|
||
float s = std::sin(perp * pi);
|
||
float t = s * s; // 0..1, peak at center
|
||
uint8_t r = static_cast<uint8_t>(br_ + t * (fr - br_));
|
||
uint8_t g = static_cast<uint8_t>(bg_ + t * (fg - bg_));
|
||
uint8_t b = static_cast<uint8_t>(bb_ + t * (fb_ - bb_));
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-carbon")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/fiber : %s / %s\n", bgHex.c_str(), fibHex.c_str());
|
||
std::printf(" weave cell : %d\n", cellSize);
|
||
return 0;
|
||
}
|
||
|
||
int handleWoodgrain(int& i, int argc, char** argv) {
|
||
// Wood-end grain: concentric annual rings centered slightly
|
||
// outside the image (so the texture shows arcs sweeping across
|
||
// it, not a bullseye like --gen-texture-rings). Ring spacing
|
||
// and per-ring darkness are jittered per ring index so
|
||
// adjacent rings don't read as a perfect modulus, mimicking
|
||
// real annual growth variation. Useful for tabletops, log-
|
||
// end caps, barrel lids, beam cross-sections.
|
||
std::string outPath = argv[++i];
|
||
std::string lightHex = argv[++i];
|
||
std::string darkHex = argv[++i];
|
||
int spacing = 14;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, spacing);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
spacing < 2 || spacing > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-woodgrain: invalid dims (W/H 1..8192, "
|
||
"spacing 2..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t lr, lg, lb, dr, dg, db;
|
||
if (!parseHexOrError(lightHex, lr, lg, lb, "gen-texture-woodgrain")) return 1;
|
||
if (!parseHexOrError(darkHex, dr, dg, db, "gen-texture-woodgrain")) return 1;
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Center the rings off the upper-left corner so the texture
|
||
// shows sweeping arcs across most of its area. Distance from
|
||
// (cx, cy) determines the ring index.
|
||
const float cx = -W * 0.2f;
|
||
const float cy = H * 0.5f;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float r = std::sqrt(dx * dx + dy * dy);
|
||
// Ring index + position within the ring [0, 1).
|
||
float ringF = r / spacing;
|
||
int ringIdx = static_cast<int>(ringF);
|
||
float frac = ringF - ringIdx;
|
||
// Per-ring jitter on darkness peak position (so dark
|
||
// rings don't repeat at exact intervals).
|
||
float jitter = ((hash32(ringIdx + seed) % 1000) / 1000.0f) - 0.5f;
|
||
// Dark ring is a thin band centered at frac=0.5+jitter
|
||
// with width 0.18. Brightness = 1.0 (light) outside,
|
||
// dropping to 0.0 (full dark color) at the band center.
|
||
float dist = std::abs(frac - (0.5f + jitter * 0.4f));
|
||
float t = std::max(0.0f, 1.0f - dist / 0.18f);
|
||
uint8_t r8 = static_cast<uint8_t>(lr + t * (dr - lr));
|
||
uint8_t g8 = static_cast<uint8_t>(lg + t * (dg - lg));
|
||
uint8_t b8 = static_cast<uint8_t>(lb + t * (db - lb));
|
||
setPixelRGB(pixels, W, x, y, r8, g8, b8);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-woodgrain")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" light/dark : %s / %s\n", lightHex.c_str(), darkHex.c_str());
|
||
std::printf(" rings : spacing=%d, seed=%u\n", spacing, seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleMoss(int& i, int argc, char** argv) {
|
||
// Moss: irregular spots scattered on a jittered grid. Each
|
||
// grid cell has a hashed (x, y, presence, radius) so the
|
||
// spots don't form a visible lattice — they read as random
|
||
// patches of organic growth. Inside a spot the color is
|
||
// mossHex; outside is bg. Useful for forest floors,
|
||
// weathered stone walls, dungeon flagstones, swamp ground.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string mossHex = argv[++i];
|
||
int stride = 16; // average spacing between spot centers
|
||
int density = 70; // 0..100 chance of spot per cell
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stride);
|
||
parseOptInt(i, argc, argv, density);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stride < 4 || stride > 1024 ||
|
||
density < 0 || density > 100) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-moss: invalid dims (W/H 1..8192, stride 4..1024, "
|
||
"density 0..100)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, mr, mg, mb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-moss")) return 1;
|
||
if (!parseHexOrError(mossHex, mr, mg, mb_, "gen-texture-moss")) return 1;
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
auto cellHash = [&](int cx, int cy, uint32_t salt) -> uint32_t {
|
||
uint32_t h = static_cast<uint32_t>(cx) * 0x9E3779B1u;
|
||
h ^= static_cast<uint32_t>(cy) * 0x85EBCA77u + seed;
|
||
h ^= salt;
|
||
return hash32(h);
|
||
};
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
// Test the 9 neighboring cells (current + 8 around) so
|
||
// spots at cell boundaries don't get clipped at the
|
||
// cell wall.
|
||
int cellX = x / stride;
|
||
int cellY = y / stride;
|
||
bool inMoss = false;
|
||
for (int dy = -1; dy <= 1 && !inMoss; ++dy) {
|
||
for (int dx = -1; dx <= 1 && !inMoss; ++dx) {
|
||
int cx = cellX + dx;
|
||
int cy = cellY + dy;
|
||
uint32_t h = cellHash(cx, cy, 0xA5A5A5A5u);
|
||
if (static_cast<int>(h % 100) >= density) continue;
|
||
// Spot center jittered within its cell.
|
||
float jx = (cellHash(cx, cy, 1) % 1000) / 1000.0f;
|
||
float jy = (cellHash(cx, cy, 2) % 1000) / 1000.0f;
|
||
float scx = (cx + jx) * stride;
|
||
float scy = (cy + jy) * stride;
|
||
// Spot radius hashed in [0.25, 0.75] of stride.
|
||
float scale = 0.25f + 0.5f *
|
||
((cellHash(cx, cy, 3) % 1000) / 1000.0f);
|
||
float spotR = stride * scale;
|
||
float ddx = x - scx;
|
||
float ddy = y - scy;
|
||
if (ddx * ddx + ddy * ddy < spotR * spotR) {
|
||
inMoss = true;
|
||
}
|
||
}
|
||
}
|
||
uint8_t r, g, b;
|
||
if (inMoss) { r = mr; g = mg; b = mb_; }
|
||
else { r = br_; g = bg_; b = bb_; }
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-moss")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/moss : %s / %s\n", bgHex.c_str(), mossHex.c_str());
|
||
std::printf(" spots : stride=%d, density=%d/100, seed=%u\n",
|
||
stride, density, seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleStuds(int& i, int argc, char** argv) {
|
||
// Riveted studs: grid of round caps with an inner highlight.
|
||
// Distinct from --gen-texture-dots (flat solid circles): each
|
||
// stud has a brighter inner core (40% radius) over a darker
|
||
// outer ring, giving a 3D rivet/stud appearance for armor and
|
||
// leather work. Cap color is studHex; the highlight is
|
||
// automatically derived as a 40%-brighter version of it.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string studHex = argv[++i];
|
||
int stride = 24;
|
||
int studR = 7;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, stride);
|
||
parseOptInt(i, argc, argv, studR);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
stride < 4 || stride > 1024 ||
|
||
studR < 1 || studR * 2 >= stride) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-studs: invalid dims (W/H 1..8192, "
|
||
"stride 4..1024, studR 1..stride/2)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-studs")) return 1;
|
||
if (!parseHexOrError(studHex, sr, sg, sb_, "gen-texture-studs")) return 1;
|
||
auto brighten = [](uint8_t c) -> uint8_t {
|
||
int v = static_cast<int>(c) * 7 / 5; // ×1.4
|
||
return v > 255 ? 255 : static_cast<uint8_t>(v);
|
||
};
|
||
uint8_t hr = brighten(sr), hg = brighten(sg), hb_ = brighten(sb_);
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float coreR = studR * 0.4f; // inner highlight radius
|
||
const float coreR2 = coreR * coreR;
|
||
const float studR2 = static_cast<float>(studR) * studR;
|
||
for (int y = 0; y < H; ++y) {
|
||
// Nearest stud center: round(y/stride)*stride.
|
||
int row = (y + stride / 2) / stride;
|
||
float cy = row * stride;
|
||
for (int x = 0; x < W; ++x) {
|
||
int col = (x + stride / 2) / stride;
|
||
float cx = col * stride;
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float d2 = dx * dx + dy * dy;
|
||
uint8_t r, g, b;
|
||
if (d2 > studR2) {
|
||
r = br_; g = bg_; b = bb_;
|
||
} else if (d2 < coreR2) {
|
||
r = hr; g = hg; b = hb_;
|
||
} else {
|
||
r = sr; g = sg; b = sb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-studs")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/stud : %s / %s\n", bgHex.c_str(), studHex.c_str());
|
||
std::printf(" studs : R=%d on %d-stride grid\n", studR, stride);
|
||
return 0;
|
||
}
|
||
|
||
int handleStarburst(int& i, int argc, char** argv) {
|
||
// Starburst: N rays radiating from the texture center. Each
|
||
// pixel computes its angle from center; if it falls inside any
|
||
// ray's angular band, paint it as the ray color. Brightness
|
||
// tapers with distance from the center (1.0 at the hub down to
|
||
// a configurable rim factor at the texture edge) so the rays
|
||
// read as fading light beams rather than infinite lines.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string rayHex = argv[++i];
|
||
int rayCount = 12;
|
||
float beamWidth = 0.18f; // radians half-width of each ray
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, rayCount);
|
||
parseOptFloat(i, argc, argv, beamWidth);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
rayCount < 2 || rayCount > 256 ||
|
||
beamWidth <= 0 || beamWidth >= 3.14f) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-starburst: invalid dims (W/H 1..8192, "
|
||
"rays 2..256, beamWidth (0,π))\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-starburst")) return 1;
|
||
if (!parseHexOrError(rayHex, rr_, rg_, rb_, "gen-texture-starburst")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float twoPi = 6.28318530717958f;
|
||
const float cx = W * 0.5f;
|
||
const float cy = H * 0.5f;
|
||
const float maxR = std::sqrt(cx * cx + cy * cy);
|
||
const float anglePer = twoPi / rayCount;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float r = std::sqrt(dx * dx + dy * dy);
|
||
float theta = std::atan2(dy, dx); // [-π, +π]
|
||
// Distance in angle space to the nearest ray axis. The
|
||
// ray axes are at integer multiples of anglePer; we
|
||
// wrap theta into [0, anglePer) and take the smaller of
|
||
// (wrapped, anglePer - wrapped) so the ends meet around
|
||
// the wraparound boundary.
|
||
float wrapped = std::fmod(theta + twoPi, anglePer);
|
||
float angDist = std::min(wrapped, anglePer - wrapped);
|
||
uint8_t resR, resG, resB;
|
||
if (angDist < beamWidth) {
|
||
// Brightness: 1.0 at the hub, falling linearly to
|
||
// 0.4 at the texture diagonal — gives sun-rays that
|
||
// taper as they extend outward.
|
||
float t = std::max(0.0f, std::min(1.0f, r / maxR));
|
||
float bright = 1.0f - 0.6f * t;
|
||
resR = static_cast<uint8_t>(std::min(255.0f,
|
||
br_ + bright * (rr_ - br_)));
|
||
resG = static_cast<uint8_t>(std::min(255.0f,
|
||
bg_ + bright * (rg_ - bg_)));
|
||
resB = static_cast<uint8_t>(std::min(255.0f,
|
||
bb_ + bright * (rb_ - bb_)));
|
||
} else {
|
||
resR = br_; resG = bg_; resB = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, resR, resG, resB);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-starburst")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/ray : %s / %s\n", bgHex.c_str(), rayHex.c_str());
|
||
std::printf(" rays : %d (beam width %.3f rad)\n",
|
||
rayCount, beamWidth);
|
||
return 0;
|
||
}
|
||
|
||
int handleCaustics(int& i, int argc, char** argv) {
|
||
// Water caustics: 4 superimposed sine waves running along
|
||
// x, y, x+y, and x-y, summed into [-4,+4] and remapped to
|
||
// [0,1]. The interference produces the classic shimmering
|
||
// diamond-mesh caustic pattern seen on pool floors and
|
||
// shallow streambeds. Two-color lerp from bgHex (depth) to
|
||
// hiHex (highlight).
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string hiHex = argv[++i];
|
||
int period = 24;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, period);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
period < 4 || period > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-caustics: invalid dims (W/H 1..8192, "
|
||
"period 4..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, hr, hg, hb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-caustics")) return 1;
|
||
if (!parseHexOrError(hiHex, hr, hg, hb_, "gen-texture-caustics")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float twoPi = 6.28318530717958f;
|
||
const float invPeriod = 1.0f / period;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
float fx = x * invPeriod * twoPi;
|
||
float fy = y * invPeriod * twoPi;
|
||
float fxy = (x + y) * invPeriod * twoPi * 0.7071f;
|
||
float fyx = (x - y) * invPeriod * twoPi * 0.7071f;
|
||
// Sum 4 waves; absolute-value the result so peaks are
|
||
// bright on either side of the wave (gives the classic
|
||
// caustic's bright-line network rather than a smooth
|
||
// checkerboard).
|
||
float v = std::abs(std::sin(fx)) * std::abs(std::sin(fy));
|
||
v += std::abs(std::sin(fxy)) * std::abs(std::sin(fyx));
|
||
float t = v * 0.5f;
|
||
if (t < 0) t = 0;
|
||
if (t > 1) t = 1;
|
||
uint8_t r = static_cast<uint8_t>(br_ + t * (hr - br_));
|
||
uint8_t g = static_cast<uint8_t>(bg_ + t * (hg - bg_));
|
||
uint8_t b = static_cast<uint8_t>(bb_ + t * (hb_ - bb_));
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-caustics")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/hi : %s / %s\n", bgHex.c_str(), hiHex.c_str());
|
||
std::printf(" period : %d\n", period);
|
||
return 0;
|
||
}
|
||
|
||
int handleRope(int& i, int argc, char** argv) {
|
||
// Twisted rope/cordage: two interleaved sinusoidal strands
|
||
// running along the Y axis. Each strand's X position oscillates
|
||
// as cellW/2 * sin(2π·y/period), and the second strand is phase-
|
||
// shifted by π so the two snake around each other forming the
|
||
// classic helical twist. Highlight banding within each strand
|
||
// (brightness * cos²) gives the rounded 3D appearance of
|
||
// tightened twine. Useful for hanging ropes, ship rigging,
|
||
// tied-bundle textures, suspension bridges, market awning ties.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string ropeHex = argv[++i];
|
||
int period = 24;
|
||
int strandW = 8;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, period);
|
||
parseOptInt(i, argc, argv, strandW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
period < 4 || period > 1024 ||
|
||
strandW < 2 || strandW > W) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rope: invalid dims (W/H 1..8192, period 4..1024, "
|
||
"strandW 2..W)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-rope")) return 1;
|
||
if (!parseHexOrError(ropeHex, rr_, rg_, rb_, "gen-texture-rope")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float twoPi = 6.28318530717958f;
|
||
const float pi = 3.14159265358979f;
|
||
// Amplitude: strands swing across W/2 so the centerline is
|
||
// always inside the texture and the two strands cross at the
|
||
// image midline x = W/2.
|
||
const float amp = (W * 0.25f);
|
||
const float fStrandHalf = strandW * 0.5f;
|
||
for (int y = 0; y < H; ++y) {
|
||
float phase = (static_cast<float>(y) / period) * twoPi;
|
||
float cx1 = W * 0.5f + amp * std::sin(phase);
|
||
float cx2 = W * 0.5f + amp * std::sin(phase + pi);
|
||
for (int x = 0; x < W; ++x) {
|
||
float dx1 = std::abs(x - cx1);
|
||
float dx2 = std::abs(x - cx2);
|
||
float d = std::min(dx1, dx2);
|
||
uint8_t r, g, b;
|
||
if (d < fStrandHalf) {
|
||
// Brightness across the strand width: 1.0 at the
|
||
// centerline, 0.0 at the edge — gives the rounded
|
||
// highlight of a real cylindrical strand.
|
||
float t = 1.0f - (d / fStrandHalf);
|
||
float br = 0.55f + 0.45f * t * t;
|
||
r = static_cast<uint8_t>(rr_ * br);
|
||
g = static_cast<uint8_t>(rg_ * br);
|
||
b = static_cast<uint8_t>(rb_ * br);
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-rope")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/rope : %s / %s\n", bgHex.c_str(), ropeHex.c_str());
|
||
std::printf(" twist : period=%d, strandW=%d\n", period, strandW);
|
||
return 0;
|
||
}
|
||
|
||
int handleCorrugated(int& i, int argc, char** argv) {
|
||
// Corrugated metal sheeting: smooth cosine ridges along one
|
||
// axis. Each pixel's brightness comes from cos((x or y) /
|
||
// period * 2π) mapped from [-1,1] to [0,1] and used to lerp
|
||
// between bgHex (the trough/shadow color) and hiHex (the
|
||
// crest/highlight color). Vertical orientation by default
|
||
// (ridges run top→bottom, wave varies along X) which is the
|
||
// standard sheet-metal-roof look.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string hiHex = argv[++i];
|
||
int period = 16;
|
||
char dir = 'v'; // 'v' = vertical ridges, 'h' = horizontal
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, period);
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
const char* a = argv[++i];
|
||
if (a[0] == 'h' || a[0] == 'H') dir = 'h';
|
||
else if (a[0] == 'v' || a[0] == 'V') dir = 'v';
|
||
}
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
period < 2 || period > 1024) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-corrugated: invalid dims (W/H 1..8192, "
|
||
"period 2..1024)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, hr, hg, hb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-corrugated")) return 1;
|
||
if (!parseHexOrError(hiHex, hr, hg, hb_, "gen-texture-corrugated")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float twoPi = 6.28318530717958f;
|
||
for (int y = 0; y < H; ++y) {
|
||
for (int x = 0; x < W; ++x) {
|
||
int v = (dir == 'v') ? x : y;
|
||
float phase = (static_cast<float>(v) / period) * twoPi;
|
||
float t = (std::cos(phase) + 1.0f) * 0.5f;
|
||
uint8_t r = static_cast<uint8_t>(br_ + t * (hr - br_));
|
||
uint8_t g = static_cast<uint8_t>(bg_ + t * (hg - bg_));
|
||
uint8_t b = static_cast<uint8_t>(bb_ + t * (hb_ - bb_));
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-corrugated")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/hi : %s / %s\n", bgHex.c_str(), hiHex.c_str());
|
||
std::printf(" ridges : period=%d (%s)\n", period,
|
||
dir == 'v' ? "vertical" : "horizontal");
|
||
return 0;
|
||
}
|
||
|
||
int handlePlanks(int& i, int argc, char** argv) {
|
||
// Plank floor: horizontal "boards" of randomized length and tint
|
||
// separated by thin dark seams. Each plank gets a hash-derived
|
||
// brightness offset so the tile reads as real boards rather than
|
||
// a single grain pattern. Useful for inn floors, deck planking,
|
||
// bridge surface, market stall counters.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string seamHex = argv[++i];
|
||
int plankH = 16;
|
||
int grainsPerPlank = 5;
|
||
uint32_t seed = 1;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, plankH);
|
||
parseOptInt(i, argc, argv, grainsPerPlank);
|
||
parseOptUint(i, argc, argv, seed);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
plankH < 4 || plankH > 256 ||
|
||
grainsPerPlank < 0 || grainsPerPlank > 64) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-planks: invalid dims (W/H 1..8192, plankH 4..256, "
|
||
"grainsPerPlank 0..64)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, sr, sg, sb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-planks")) return 1;
|
||
if (!parseHexOrError(seamHex, sr, sg, sb_, "gen-texture-planks")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
// Plank-index hash → per-plank brightness modulation in [-24, +24]
|
||
// and an end-seam x position so the planks look staggered rather
|
||
// than all the same length.
|
||
auto hash32 = [](uint32_t x) -> uint32_t {
|
||
x ^= x >> 16; x *= 0x7feb352d;
|
||
x ^= x >> 15; x *= 0x846ca68b;
|
||
x ^= x >> 16; return x;
|
||
};
|
||
auto clamp = [](int v) {
|
||
return v < 0 ? 0 : (v > 255 ? 255 : v);
|
||
};
|
||
for (int y = 0; y < H; ++y) {
|
||
int plankIdx = y / plankH;
|
||
int yInPlank = y % plankH;
|
||
uint32_t h = hash32(plankIdx * 0x9e3779b1u + seed);
|
||
int tint = static_cast<int>(h % 49) - 24; // -24..+24
|
||
// Plank-end seam at this y: a vertical line at x = endX.
|
||
int endX = static_cast<int>(hash32(h ^ 0xa5a5a5a5u) % W);
|
||
for (int x = 0; x < W; ++x) {
|
||
uint8_t r = clamp(br_ + tint);
|
||
uint8_t g = clamp(bg_ + tint);
|
||
uint8_t b = clamp(bb_ + tint);
|
||
// Horizontal plank seam: the bottom 1 px of every plank
|
||
// is the seam color so adjacent planks read as separate
|
||
// boards, not one long stripe.
|
||
bool atHSeam = (yInPlank == plankH - 1);
|
||
// Vertical end seam: 1 px wide at endX.
|
||
bool atVSeam = (x == endX);
|
||
if (atHSeam || atVSeam) {
|
||
r = sr; g = sg; b = sb_;
|
||
} else if (grainsPerPlank > 0) {
|
||
// Vertical grain streaks: at G evenly-spaced columns
|
||
// within the plank, draw a faint darker line. Position
|
||
// jittered per plank so it doesn't repeat exactly
|
||
// every row.
|
||
int strideX = W / (grainsPerPlank + 1);
|
||
int jitter = static_cast<int>(h >> 8) % strideX;
|
||
int dx = (x - jitter) % strideX;
|
||
if (dx == 0) {
|
||
r = static_cast<uint8_t>(clamp(int(r) - 15));
|
||
g = static_cast<uint8_t>(clamp(int(g) - 15));
|
||
b = static_cast<uint8_t>(clamp(int(b) - 15));
|
||
}
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-planks")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/seam : %s / %s\n", bgHex.c_str(), seamHex.c_str());
|
||
std::printf(" plank H : %d (grains/plank %d)\n",
|
||
plankH, grainsPerPlank);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
int handleChainmail(int& i, int argc, char** argv) {
|
||
// Chainmail: rings tile in a brick/hexagonal pattern with even
|
||
// and odd rows offset by half a cell width — each pixel is
|
||
// tested against the nearest ring center; if its distance lies
|
||
// in [ringR-stroke/2, ringR+stroke/2] it's painted as the ring
|
||
// color, else background. The cellH < cellW default produces
|
||
// overlapping rings that read as interlinked metal mail.
|
||
std::string outPath = argv[++i];
|
||
std::string bgHex = argv[++i];
|
||
std::string ringHex = argv[++i];
|
||
int cellW = 14;
|
||
int cellH = 10;
|
||
int ringR = 5;
|
||
float strokeW = 1.5f;
|
||
int W = 256, H = 256;
|
||
parseOptInt(i, argc, argv, cellW);
|
||
parseOptInt(i, argc, argv, cellH);
|
||
parseOptInt(i, argc, argv, ringR);
|
||
parseOptFloat(i, argc, argv, strokeW);
|
||
parseOptInt(i, argc, argv, W);
|
||
parseOptInt(i, argc, argv, H);
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
cellW < 4 || cellW > 256 ||
|
||
cellH < 4 || cellH > 256 ||
|
||
ringR < 2 || ringR > cellW ||
|
||
strokeW < 0.5f || strokeW > ringR) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-chainmail: invalid dims (W/H 1..8192, "
|
||
"cellW/H 4..256, ringR 2..cellW, strokeW 0.5..ringR)\n");
|
||
return 1;
|
||
}
|
||
uint8_t br_, bg_, bb_, rr_, rg_, rb_;
|
||
if (!parseHexOrError(bgHex, br_, bg_, bb_, "gen-texture-chainmail")) return 1;
|
||
if (!parseHexOrError(ringHex, rr_, rg_, rb_, "gen-texture-chainmail")) return 1;
|
||
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
|
||
const float halfStroke = strokeW * 0.5f;
|
||
const float fRingR = static_cast<float>(ringR);
|
||
for (int y = 0; y < H; ++y) {
|
||
// Offset alternate rows by half a cell so rings interlock
|
||
// with the row above/below — classic brick/hex layout.
|
||
int row = y / cellH;
|
||
float rowOffset = (row & 1) ? cellW * 0.5f : 0.0f;
|
||
float cy = (row + 0.5f) * cellH;
|
||
for (int x = 0; x < W; ++x) {
|
||
// Wrap into the row's offset cell to find ring center.
|
||
float xOff = x - rowOffset;
|
||
int col = static_cast<int>(std::floor(xOff / cellW));
|
||
float cx = (col + 0.5f) * cellW + rowOffset;
|
||
float dx = x - cx;
|
||
float dy = y - cy;
|
||
float d = std::sqrt(dx * dx + dy * dy);
|
||
uint8_t r, g, b;
|
||
if (std::fabs(d - fRingR) < halfStroke) {
|
||
r = rr_; g = rg_; b = rb_;
|
||
} else {
|
||
r = br_; g = bg_; b = bb_;
|
||
}
|
||
setPixelRGB(pixels, W, x, y, r, g, b);
|
||
}
|
||
}
|
||
if (!savePngOrError(outPath, W, H, pixels, "gen-texture-chainmail")) return 1;
|
||
std::printf("Wrote %s\n", outPath.c_str());
|
||
std::printf(" size : %dx%d\n", W, H);
|
||
std::printf(" bg/ring : %s / %s\n", bgHex.c_str(), ringHex.c_str());
|
||
std::printf(" ring : R=%d on %dx%d brick (stroke %.2f px)\n",
|
||
ringR, cellW, cellH, strokeW);
|
||
return 0;
|
||
}
|
||
|
||
} // namespace
|
||
|
||
namespace {
|
||
// Same dispatch pattern as cli_gen_mesh.cpp's kMeshTable. Each row
|
||
// names the flag, the minimum arg count after it (used as a guard
|
||
// for the dispatcher — kArgRequired catches the bare-flag case at
|
||
// argv parse time, but this guard fires when there are zero args
|
||
// AND no later argv slots), and the handler function pointer.
|
||
struct TextureEntry {
|
||
const char* flag;
|
||
int minNextArgs;
|
||
int (*fn)(int&, int, char**);
|
||
};
|
||
|
||
constexpr TextureEntry kTextureTable[] = {
|
||
{"--gen-texture-gradient", 3, handleGradient},
|
||
{"--gen-texture-noise-color", 3, handleNoiseColor},
|
||
{"--gen-texture-noise", 1, handleNoise},
|
||
{"--gen-texture-radial", 3, handleRadial},
|
||
{"--gen-texture-stripes", 3, handleStripes},
|
||
{"--gen-texture-dots", 3, handleDots},
|
||
{"--gen-texture-rings", 3, handleRings},
|
||
{"--gen-texture-checker", 3, handleChecker},
|
||
{"--gen-texture-brick", 3, handleBrick},
|
||
{"--gen-texture-wood", 3, handleWood},
|
||
{"--gen-texture-grass", 3, handleGrass},
|
||
{"--gen-texture-fabric", 3, handleFabric},
|
||
{"--gen-texture-cobble", 3, handleCobble},
|
||
{"--gen-texture-marble", 2, handleMarble},
|
||
{"--gen-texture-metal", 2, handleMetal},
|
||
{"--gen-texture-leather", 2, handleLeather},
|
||
{"--gen-texture-sand", 2, handleSand},
|
||
{"--gen-texture-snow", 2, handleSnow},
|
||
{"--gen-texture-lava", 3, handleLava},
|
||
{"--gen-texture-tile", 3, handleTile},
|
||
{"--gen-texture-bark", 3, handleBark},
|
||
{"--gen-texture-clouds", 3, handleClouds},
|
||
{"--gen-texture-stars", 3, handleStars},
|
||
{"--gen-texture-vines", 3, handleVines},
|
||
{"--gen-texture-mosaic", 4, handleMosaic},
|
||
{"--gen-texture-rust", 3, handleRust},
|
||
{"--gen-texture-circuit", 3, handleCircuit},
|
||
{"--gen-texture-coral", 3, handleCoral},
|
||
{"--gen-texture-flame", 3, handleFlame},
|
||
{"--gen-texture-tartan", 4, handleTartan},
|
||
{"--gen-texture-argyle", 4, handleArgyle},
|
||
{"--gen-texture-herringbone", 3, handleHerringbone},
|
||
{"--gen-texture-scales", 4, handleScales},
|
||
{"--gen-texture-stained-glass", 5, handleStainedGlass},
|
||
{"--gen-texture-shingles", 4, handleShingles},
|
||
{"--gen-texture-frost", 3, handleFrost},
|
||
{"--gen-texture-parquet", 4, handleParquet},
|
||
{"--gen-texture-bubbles", 4, handleBubbles},
|
||
{"--gen-texture-spider-web", 3, handleSpiderWeb},
|
||
{"--gen-texture-gingham", 4, handleGingham},
|
||
{"--gen-texture-lattice", 3, handleLattice},
|
||
{"--gen-texture-honeycomb", 3, handleHoneycomb},
|
||
{"--gen-texture-cracked", 3, handleCracked},
|
||
{"--gen-texture-runes", 3, handleRunes},
|
||
{"--gen-texture-leopard", 3, handleLeopard},
|
||
{"--gen-texture-zebra", 3, handleZebra},
|
||
{"--gen-texture-knit", 3, handleKnit},
|
||
{"--gen-texture-chainmail", 3, handleChainmail},
|
||
{"--gen-texture-planks", 3, handlePlanks},
|
||
{"--gen-texture-corrugated", 3, handleCorrugated},
|
||
{"--gen-texture-rope", 3, handleRope},
|
||
{"--gen-texture-caustics", 3, handleCaustics},
|
||
{"--gen-texture-starburst", 3, handleStarburst},
|
||
{"--gen-texture-studs", 3, handleStuds},
|
||
{"--gen-texture-moss", 3, handleMoss},
|
||
{"--gen-texture-woodgrain", 3, handleWoodgrain},
|
||
{"--gen-texture-carbon", 3, handleCarbon},
|
||
{"--gen-texture-pinstripe", 3, handlePinstripe},
|
||
{"--gen-texture-camo", 3, handleCamo},
|
||
{"--gen-texture-snake-skin", 3, handleSnakeSkin},
|
||
{"--gen-texture-mesh-screen", 3, handleMeshScreen},
|
||
{"--gen-texture-bamboo", 3, handleBamboo},
|
||
{"--gen-texture-blueprint", 3, handleBlueprint},
|
||
{"--gen-texture-rust-streaks", 3, handleRustStreaks},
|
||
};
|
||
} // namespace
|
||
|
||
bool handleGenTexture(int& i, int argc, char** argv, int& outRc) {
|
||
// Note: order matters only for prefix-collision flags. strcmp
|
||
// is exact-match so e.g. --gen-texture-noise vs --gen-texture-noise-color
|
||
// are unambiguous regardless of order.
|
||
for (const auto& e : kTextureTable) {
|
||
if (std::strcmp(argv[i], e.flag) == 0 && i + e.minNextArgs < argc) {
|
||
outRc = e.fn(i, argc, argv);
|
||
return true;
|
||
}
|
||
}
|
||
return false;
|
||
}
|
||
|
||
} // namespace cli
|
||
} // namespace editor
|
||
} // namespace wowee
|