mirror of
https://github.com/Kelsidavis/WoWee.git
synced 2026-05-10 02:53:51 +00:00
08f740a1ff
Multi-octave cosine-product noise (4 octaves at doubling frequency, halving amplitude) thresholded by `coverage` so values above the threshold blend toward cloud color and below fade to sky. A 0.15-wide smoothstep band feathers cloud edges instead of stepping hard. Defaults: coverage=0.5 (mixed clouds), seed=1. Useful for skybox cubemaps, distant sky planes, atmospheric backdrop art. Brings the procedural texture pattern set to 25.
2172 lines
86 KiB
C++
2172 lines
86 KiB
C++
#include "cli_gen_texture.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 <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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// Returns false on malformed input (caller should error out).
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bool parseHex(std::string hex, uint8_t& r, uint8_t& g, uint8_t& b) {
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std::transform(hex.begin(), hex.end(), hex.begin(),
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[](unsigned char c) { return std::tolower(c); });
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if (!hex.empty() && hex[0] == '#') hex.erase(0, 1);
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auto fromHexC = [](char c) -> int {
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if (c >= '0' && c <= '9') return c - '0';
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if (c >= 'a' && c <= 'f') return 10 + c - 'a';
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return -1;
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};
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int v[6];
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if (hex.size() == 6) {
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for (int k = 0; k < 6; ++k) {
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v[k] = fromHexC(hex[k]);
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if (v[k] < 0) return false;
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}
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r = static_cast<uint8_t>((v[0] << 4) | v[1]);
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g = static_cast<uint8_t>((v[2] << 4) | v[3]);
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b = static_cast<uint8_t>((v[4] << 4) | v[5]);
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return true;
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}
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if (hex.size() == 3) {
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for (int k = 0; k < 3; ++k) {
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v[k] = fromHexC(hex[k]);
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if (v[k] < 0) return false;
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}
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r = static_cast<uint8_t>((v[0] << 4) | v[0]);
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g = static_cast<uint8_t>((v[1] << 4) | v[1]);
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b = static_cast<uint8_t>((v[2] << 4) | v[2]);
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return true;
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}
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return false;
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}
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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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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { stonePx = std::stoi(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { W = std::stoi(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { H = std::stoi(argv[++i]); } catch (...) {}
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}
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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 (!parseHex(stoneHex, sr, sg, sb)) {
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std::fprintf(stderr,
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"gen-texture-cobble: '%s' is not a valid hex color\n",
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stoneHex.c_str());
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return 1;
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}
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if (!parseHex(mortarHex, mr, mg, mb)) {
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std::fprintf(stderr,
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"gen-texture-cobble: '%s' is not a valid hex color\n",
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mortarHex.c_str());
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return 1;
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}
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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 (!stbi_write_png(outPath.c_str(), W, H, 3,
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pixels.data(), W * 3)) {
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std::fprintf(stderr,
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"gen-texture-cobble: stbi_write_png failed for %s\n",
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outPath.c_str());
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return 1;
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}
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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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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { sharpness = std::stof(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { W = std::stoi(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { H = std::stoi(argv[++i]); } catch (...) {}
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}
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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 (!parseHex(baseHex, br, bg, bb_)) {
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std::fprintf(stderr,
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"gen-texture-marble: '%s' is not a valid hex color\n",
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baseHex.c_str());
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return 1;
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}
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if (!parseHex(veinHex, vr, vg, vb)) {
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std::fprintf(stderr,
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"gen-texture-marble: '%s' is not a valid hex color\n",
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veinHex.c_str());
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return 1;
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}
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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 (!stbi_write_png(outPath.c_str(), W, H, 3,
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pixels.data(), W * 3)) {
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std::fprintf(stderr,
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"gen-texture-marble: stbi_write_png failed for %s\n",
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outPath.c_str());
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return 1;
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}
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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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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
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}
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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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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { W = std::stoi(argv[++i]); } catch (...) {}
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}
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if (i + 1 < argc && argv[i + 1][0] != '-') {
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try { H = std::stoi(argv[++i]); } catch (...) {}
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}
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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 (!parseHex(baseHex, mr, mg, mb)) {
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std::fprintf(stderr,
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"gen-texture-metal: '%s' is not a valid hex color\n",
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baseHex.c_str());
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return 1;
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}
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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 (!stbi_write_png(outPath.c_str(), W, H, 3,
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pixels.data(), W * 3)) {
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std::fprintf(stderr,
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"gen-texture-metal: stbi_write_png failed for %s\n",
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outPath.c_str());
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return 1;
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}
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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;
|
||
int grainSize = 4; // average pebble cell size in px
|
||
int W = 256, H = 256;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { grainSize = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
|
||
grainSize < 2 || grainSize > 64) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-leather: invalid dims (W/H 1..8192, grainSize 2..64)\n");
|
||
return 1;
|
||
}
|
||
uint8_t lr, lg, lb;
|
||
if (!parseHex(baseHex, lr, lg, lb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-leather: '%s' is not a valid hex color\n",
|
||
baseHex.c_str());
|
||
return 1;
|
||
}
|
||
// Per-cell hash (same idea as cobble, but smaller cells).
|
||
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 / grainSize;
|
||
for (int x = 0; x < W; ++x) {
|
||
int cx0 = x / grainSize;
|
||
float bestD = 1e9f, second = 1e9f;
|
||
int bestCx = 0, bestCy = 0;
|
||
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) * 0.6f;
|
||
float jy = (hash01(cx, cy, 1) - 0.5f) * 0.6f;
|
||
float ccx = (cx + 0.5f + jx) * grainSize;
|
||
float ccy = (cy + 0.5f + jy) * grainSize;
|
||
float dxp = x - ccx, dyp = y - ccy;
|
||
float d = std::sqrt(dxp * dxp + dyp * dyp);
|
||
if (d < bestD) {
|
||
second = bestD;
|
||
bestD = d;
|
||
bestCx = cx;
|
||
bestCy = cy;
|
||
} else if (d < second) {
|
||
second = d;
|
||
}
|
||
}
|
||
}
|
||
// Boundary darkness: closer to the cell border
|
||
// = darker. Scaled by grainSize for resolution
|
||
// independence.
|
||
float boundary = (second - bestD) / grainSize;
|
||
float boundaryShade = std::clamp(boundary * 1.5f, 0.4f, 1.0f);
|
||
// Per-cell tint: ±15% lightness.
|
||
float tint = 0.85f + 0.30f * hash01(bestCx, bestCy, 2);
|
||
float shade = boundaryShade * tint;
|
||
size_t i2 = (static_cast<size_t>(y) * W + x) * 3;
|
||
pixels[i2 + 0] = static_cast<uint8_t>(
|
||
std::clamp(lr * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 1] = static_cast<uint8_t>(
|
||
std::clamp(lg * shade, 0.0f, 255.0f));
|
||
pixels[i2 + 2] = static_cast<uint8_t>(
|
||
std::clamp(lb * shade, 0.0f, 255.0f));
|
||
}
|
||
}
|
||
if (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-leather: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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(" grain size : %d px\n", grainSize);
|
||
std::printf(" seed : %u\n", seed);
|
||
return 0;
|
||
}
|
||
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { rippleSpacing = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(baseHex, br, bg, bb_)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-sand: '%s' is not a valid hex color\n",
|
||
baseHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-sand: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { density = std::stof(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(baseHex, br, bg, bb_)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-snow: '%s' is not a valid hex color\n",
|
||
baseHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-snow: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { crackScale = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(darkHex, dr, dg, db)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-lava: '%s' is not a valid hex color\n",
|
||
darkHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(hotHex, hr, hg, hb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-lava: '%s' is not a valid hex color\n",
|
||
hotHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-lava: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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++;
|
||
}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(fromHex, r0, g0, b0)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-gradient: '%s' is not a valid hex color\n",
|
||
fromHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(toHex, r1, g1, b1)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-gradient: '%s' is not a valid hex color\n",
|
||
toHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-gradient: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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 (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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 (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(aHex, ra, ga, ba)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise-color: '%s' is not a valid hex color\n",
|
||
aHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(bHex, rb, gb, bb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise-color: '%s' is not a valid hex color\n",
|
||
bHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-noise-color: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(centerHex, rc, gc, bc)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-radial: '%s' is not a valid hex color\n",
|
||
centerHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(edgeHex, re, ge, be)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-radial: '%s' is not a valid hex color\n",
|
||
edgeHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-radial: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { stripePx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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++;
|
||
}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(aHex, ra, ga, ba)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stripes: '%s' is not a valid hex color\n",
|
||
aHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(bHex, rb, gb, bb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stripes: '%s' is not a valid hex color\n",
|
||
bHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-stripes: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { radius = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { spacing = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(bgHex, br, bg, bb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-dots: '%s' is not a valid hex color\n",
|
||
bgHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(dotHex, dr, dg, db)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-dots: '%s' is not a valid hex color\n",
|
||
dotHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-dots: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { ringPx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(aHex, ra, ga, ba)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rings: '%s' is not a valid hex color\n",
|
||
aHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(bHex, rb, gb, bb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rings: '%s' is not a valid hex color\n",
|
||
bHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-rings: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { cellPx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(aHex, ra, ga, ba)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-checker: '%s' is not a valid hex color\n",
|
||
aHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(bHex, rb, gb, bb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-checker: '%s' is not a valid hex color\n",
|
||
bHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-checker: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { brickW = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { brickH = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { mortarPx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(brickHex, br, bg, bb_)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-brick: '%s' is not a valid hex color\n",
|
||
brickHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(mortarHex, mr, mg, mb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-brick: '%s' is not a valid hex color\n",
|
||
mortarHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-brick: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { spacing = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(lightHex, lr, lg, lb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-wood: '%s' is not a valid hex color\n",
|
||
lightHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(darkHex, dr, dg, db)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-wood: '%s' is not a valid hex color\n",
|
||
darkHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-wood: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { density = std::stof(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(baseHex, br, bg, bb_)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-grass: '%s' is not a valid hex color\n",
|
||
baseHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(bladeHex, gr, gg, gb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-grass: '%s' is not a valid hex color\n",
|
||
bladeHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-grass: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { threadPx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(warpHex, wr, wg, wb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-fabric: '%s' is not a valid hex color\n",
|
||
warpHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(weftHex, fr, fg, fb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-fabric: '%s' is not a valid hex color\n",
|
||
weftHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-fabric: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { tilePx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { groutPx = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(tileHex, tr, tg, tb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-tile: '%s' is not a valid hex color\n",
|
||
tileHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(groutHex, gr, gg, gb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-tile: '%s' is not a valid hex color\n",
|
||
groutHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-tile: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { density = std::stof(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(baseHex, br, bg, bb_)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bark: '%s' is not a valid hex color\n",
|
||
baseHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(crackHex, cr, cg, cb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bark: '%s' is not a valid hex color\n",
|
||
crackHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-bark: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { seed = static_cast<uint32_t>(std::stoul(argv[++i])); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { coverage = std::stof(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { W = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
if (i + 1 < argc && argv[i + 1][0] != '-') {
|
||
try { H = std::stoi(argv[++i]); } catch (...) {}
|
||
}
|
||
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 (!parseHex(skyHex, sr, sg, sb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-clouds: '%s' is not a valid hex color\n",
|
||
skyHex.c_str());
|
||
return 1;
|
||
}
|
||
if (!parseHex(cloudHex, cr, cg, cb)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-clouds: '%s' is not a valid hex color\n",
|
||
cloudHex.c_str());
|
||
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 (!stbi_write_png(outPath.c_str(), W, H, 3,
|
||
pixels.data(), W * 3)) {
|
||
std::fprintf(stderr,
|
||
"gen-texture-clouds: stbi_write_png failed for %s\n",
|
||
outPath.c_str());
|
||
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;
|
||
}
|
||
|
||
} // namespace
|
||
|
||
bool handleGenTexture(int& i, int argc, char** argv, int& outRc) {
|
||
if (std::strcmp(argv[i], "--gen-texture-gradient") == 0 && i + 3 < argc) {
|
||
outRc = handleGradient(i, argc, argv); return true;
|
||
}
|
||
// noise-color first because the prefix-match would otherwise hit
|
||
// 'noise' on a 'noise-color' invocation.
|
||
if (std::strcmp(argv[i], "--gen-texture-noise-color") == 0 && i + 3 < argc) {
|
||
outRc = handleNoiseColor(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-noise") == 0 && i + 1 < argc) {
|
||
outRc = handleNoise(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-radial") == 0 && i + 3 < argc) {
|
||
outRc = handleRadial(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-stripes") == 0 && i + 3 < argc) {
|
||
outRc = handleStripes(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-dots") == 0 && i + 3 < argc) {
|
||
outRc = handleDots(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-rings") == 0 && i + 3 < argc) {
|
||
outRc = handleRings(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-checker") == 0 && i + 3 < argc) {
|
||
outRc = handleChecker(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-brick") == 0 && i + 3 < argc) {
|
||
outRc = handleBrick(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-wood") == 0 && i + 3 < argc) {
|
||
outRc = handleWood(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-grass") == 0 && i + 3 < argc) {
|
||
outRc = handleGrass(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-fabric") == 0 && i + 3 < argc) {
|
||
outRc = handleFabric(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-cobble") == 0 && i + 3 < argc) {
|
||
outRc = handleCobble(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-marble") == 0 && i + 2 < argc) {
|
||
outRc = handleMarble(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-metal") == 0 && i + 2 < argc) {
|
||
outRc = handleMetal(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-leather") == 0 && i + 2 < argc) {
|
||
outRc = handleLeather(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-sand") == 0 && i + 2 < argc) {
|
||
outRc = handleSand(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-snow") == 0 && i + 2 < argc) {
|
||
outRc = handleSnow(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-lava") == 0 && i + 3 < argc) {
|
||
outRc = handleLava(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-tile") == 0 && i + 3 < argc) {
|
||
outRc = handleTile(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-bark") == 0 && i + 3 < argc) {
|
||
outRc = handleBark(i, argc, argv); return true;
|
||
}
|
||
if (std::strcmp(argv[i], "--gen-texture-clouds") == 0 && i + 3 < argc) {
|
||
outRc = handleClouds(i, argc, argv); return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
} // namespace cli
|
||
} // namespace editor
|
||
} // namespace wowee
|