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feat(editor): add --gen-texture-lava molten-rock pattern
Worley cellular noise where each cell is a chunk of cooled crust and the inter-cell boundaries glow as bright cracks of exposed magma. Each pixel finds its 2 nearest jittered cell centers; pixels close to the boundary (small gap between distances) become hot, with a soft penumbra falling off into the dark crust interior. Defaults: crackScale=32px, seed=1. Useful for volcanic zones, elemental dungeons, lava lakes. Brings the procedural texture pattern set to 22.
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Kelsi
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2 changed files with 148 additions and 0 deletions
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@ -568,6 +568,7 @@ int main(int argc, char* argv[]) {
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"--gen-texture-wood", "--gen-texture-grass", "--gen-texture-fabric",
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"--gen-texture-cobble", "--gen-texture-marble", "--gen-texture-metal",
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"--gen-texture-leather", "--gen-texture-sand", "--gen-texture-snow",
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"--gen-texture-lava",
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"--validate-glb", "--info-glb", "--info-glb-tree", "--info-glb-bytes",
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"--validate-jsondbc", "--check-glb-bounds", "--validate-stl",
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"--validate-png", "--validate-blp",
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@ -18752,6 +18753,151 @@ int main(int argc, char* argv[]) {
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density, sparkles);
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std::printf(" seed : %u\n", seed);
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return 0;
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} else if (std::strcmp(argv[i], "--gen-texture-lava") == 0 && i + 3 < argc) {
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// Lava texture: dark cooled-crust base with bright
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// glowing cracks tracing Worley cell boundaries — the
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// canonical "broken obsidian shell over magma" look.
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// Same cellular noise structure as gen-texture-cobble
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// but the boundary regions glow hot instead of darken.
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std::string outPath = argv[++i];
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std::string darkHex = argv[++i];
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std::string hotHex = argv[++i];
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uint32_t seed = 1;
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int crackScale = 32; // average cell size in px
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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 { crackScale = 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 { 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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crackScale < 8 || crackScale > 512) {
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std::fprintf(stderr,
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"gen-texture-lava: invalid dims (W/H 1..8192, crackScale 8..512)\n");
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return 1;
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}
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auto parseHex = [](std::string hex,
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uint8_t& r, uint8_t& g, uint8_t& b) -> bool {
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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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uint8_t dr, dg, db, hr, hg, hb;
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if (!parseHex(darkHex, dr, dg, db)) {
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std::fprintf(stderr,
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"gen-texture-lava: '%s' is not a valid hex color\n",
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darkHex.c_str());
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return 1;
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}
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if (!parseHex(hotHex, hr, hg, hb)) {
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std::fprintf(stderr,
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"gen-texture-lava: '%s' is not a valid hex color\n",
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hotHex.c_str());
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return 1;
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}
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auto hash01 = [seed](int cx, int cy, int comp) -> float {
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uint32_t h = static_cast<uint32_t>(cx) * 374761393u +
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static_cast<uint32_t>(cy) * 668265263u +
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seed * 2147483647u +
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static_cast<uint32_t>(comp) * 16777619u;
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h = (h ^ (h >> 13)) * 1274126177u;
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h = h ^ (h >> 16);
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return (h >> 8) * (1.0f / 16777216.0f);
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};
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std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
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for (int y = 0; y < H; ++y) {
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int cy0 = y / crackScale;
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for (int x = 0; x < W; ++x) {
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int cx0 = x / crackScale;
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float bestD = 1e9f, second = 1e9f;
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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) * crackScale;
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float ccy = (cy + 0.5f + jy) * crackScale;
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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) { second = bestD; bestD = d; }
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else if (d < second) { second = d; }
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}
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}
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// Boundary intensity: thin glow band where the
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// distance to the second-closest center is
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// close to the distance to the closest. Glow
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// strength falls off as we move away from the
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// crack into the cell interior.
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float boundary = (second - bestD) / crackScale;
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float crackWidth = 0.08f;
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float glow = 0.0f;
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if (boundary < crackWidth) {
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// Inside the crack — bright hot color.
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glow = 1.0f - boundary / crackWidth;
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} else if (boundary < crackWidth * 4.0f) {
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// Penumbra: soft glow falling off into crust.
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glow = 0.3f * (1.0f - (boundary - crackWidth) /
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(crackWidth * 3.0f));
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}
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glow = std::clamp(glow, 0.0f, 1.0f);
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uint8_t r = static_cast<uint8_t>(dr * (1 - glow) + hr * glow);
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uint8_t g = static_cast<uint8_t>(dg * (1 - glow) + hg * glow);
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uint8_t b = static_cast<uint8_t>(db * (1 - glow) + hb * glow);
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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-lava: 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(" dark/hot : %s / %s\n",
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darkHex.c_str(), hotHex.c_str());
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std::printf(" crack scale : %d px\n", crackScale);
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std::printf(" seed : %u\n", seed);
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return 0;
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} else if (std::strcmp(argv[i], "--gen-mesh") == 0 && i + 2 < argc) {
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// Synthesize a procedural primitive WOM. Generates proper
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// per-face normals, planar UVs, a bounding box, and a
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