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feat(editor): add --gen-texture-wood grain pattern command

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Procedural wood grain texture: vertical streaks of varying width
between two hues, plus pseudo-random knots. Reproducible from a
seed via tiny LCG (no <random> dep). Suitable for doors, planks,
fences, crates.

Defaults: spacing=12px, seed=1, W=H=256. Brings procedural
texture pattern set to 13 commands.
This commit is contained in:
Kelsi 2026-05-07 22:58:28 -07:00
parent bd4e7a302d
commit 39ea13965e
1 changed files with 158 additions and 0 deletions
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158
tools/editor/main.cpp
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@ -545,6 +545,8 @@ static void printUsage(const char* argv0) {
std::printf(" Synthesize checkerboard with custom colors (gen-texture's checker is BW only)\n");
std::printf(" --gen-texture-brick <out.png> <brickHex> <mortarHex> [brickW] [brickH] [mortarPx] [W H]\n");
std::printf(" Brick wall pattern with offset rows + mortar lines (default 64×24, 4px mortar)\n");
std::printf(" --gen-texture-wood <out.png> <lightHex> <darkHex> [grainSpacing] [seed] [W H]\n");
std::printf(" Wood grain pattern with vertical streaks + knots (default spacing 12px, seed 1)\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");
@ -1068,6 +1070,7 @@ int main(int argc, char* argv[]) {
"--merge-meshes",
"--gen-texture-radial", "--gen-texture-stripes", "--gen-texture-dots",
"--gen-texture-rings", "--gen-texture-checker", "--gen-texture-brick",
"--gen-texture-wood",
"--validate-glb", "--info-glb", "--info-glb-tree", "--info-glb-bytes",
"--validate-jsondbc", "--check-glb-bounds", "--validate-stl",
"--validate-png", "--validate-blp",
@ -18298,6 +18301,161 @@ int main(int argc, char* argv[]) {
std::printf(" mortar : %d px (%s)\n",
mortarPx, mortarHex.c_str());
return 0;
} else if (std::strcmp(argv[i], "--gen-texture-wood") == 0 && i + 3 < argc) {
// 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;
}
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 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;
} 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