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feat(editor): add --gen-texture-snow with sparkle pass
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Cool-white base with low-frequency cosine luminance variation
(soft uneven powdery look) plus per-pixel jitter, then a
sparkle pass scatters bright single-pixel highlights at the
configured density (the "ice crystals catching light" effect).

Defaults: density=0.005 (~0.5% of pixels sparkle), seed=1.
Useful for winter zones, snowy mountains, ice caves, frozen
wastes. Brings the procedural texture pattern set to 21.
This commit is contained in:
Kelsi 2026-05-08 19:07:41 -07:00
parent a773654be5
commit bb8580068b
1 changed files with 120 additions and 1 deletions
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121
tools/editor/main.cpp
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@ -568,6 +568,8 @@ static void printUsage(const char* argv0) {
std::printf(" Leather grain: irregular pebbled bumps via cellular noise (default grain=4px)\n");
std::printf(" --gen-texture-sand <out.png> <baseHex> [seed] [rippleSpacing] [W H]\n");
std::printf(" Sand dunes: per-pixel grain noise + sinusoidal ripple bands (default ripple=24px)\n");
std::printf(" --gen-texture-snow <out.png> <baseHex> [seed] [sparkleDensity] [W H]\n");
std::printf(" Snow: soft cool-white base + scattered bright sparkle pixels (default density=0.005)\n");
std::printf(" --add-texture-to-zone <zoneDir> <png-path> [renameTo]\n");
std::printf(" Copy an existing PNG into <zoneDir> (optionally renaming it on the way in)\n");
std::printf(" --gen-mesh <wom-base> <cube|plane|sphere|cylinder|torus|cone|ramp> [size]\n");
@ -1159,7 +1161,7 @@ int main(int argc, char* argv[]) {
"--gen-texture-rings", "--gen-texture-checker", "--gen-texture-brick",
"--gen-texture-wood", "--gen-texture-grass", "--gen-texture-fabric",
"--gen-texture-cobble", "--gen-texture-marble", "--gen-texture-metal",
"--gen-texture-leather", "--gen-texture-sand",
"--gen-texture-leather", "--gen-texture-sand", "--gen-texture-snow",
"--validate-glb", "--info-glb", "--info-glb-tree", "--info-glb-bytes",
"--validate-jsondbc", "--check-glb-bounds", "--validate-stl",
"--validate-png", "--validate-blp",
@ -19228,6 +19230,123 @@ int main(int argc, char* argv[]) {
std::printf(" ripple spacing : %d px\n", rippleSpacing);
std::printf(" seed : %u\n", seed);
return 0;
} else if (std::strcmp(argv[i], "--gen-texture-snow") == 0 && i + 2 < argc) {
// 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;
}
auto parseHex = [](std::string hex,
uint8_t& r, uint8_t& g, uint8_t& b) -> bool {
std::transform(hex.begin(), hex.end(), hex.begin(),
[](unsigned char c) { return std::tolower(c); });
if (!hex.empty() && hex[0] == '#') hex.erase(0, 1);
auto fromHexC = [](char c) -> int {
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return 10 + c - 'a';
return -1;
};
int v[6];
if (hex.size() == 6) {
for (int k = 0; k < 6; ++k) {
v[k] = fromHexC(hex[k]);
if (v[k] < 0) return false;
}
r = static_cast<uint8_t>((v[0] << 4) | v[1]);
g = static_cast<uint8_t>((v[2] << 4) | v[3]);
b = static_cast<uint8_t>((v[4] << 4) | v[5]);
return true;
}
if (hex.size() == 3) {
for (int k = 0; k < 3; ++k) {
v[k] = fromHexC(hex[k]);
if (v[k] < 0) return false;
}
r = static_cast<uint8_t>((v[0] << 4) | v[0]);
g = static_cast<uint8_t>((v[1] << 4) | v[1]);
b = static_cast<uint8_t>((v[2] << 4) | v[2]);
return true;
}
return false;
};
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;
} else if (std::strcmp(argv[i], "--gen-mesh") == 0 && i + 2 < argc) {
// Synthesize a procedural primitive WOM. Generates proper
// per-face normals, planar UVs, a bounding box, and a