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feat(editor): add --gen-texture-houndstooth classic-textile motif

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67th procedural texture: the classic 19th-century Scottish
houndstooth broken-check pattern via a hard-coded seamless
8x8 motif:

    1 1 1 1 0 0 0 0
    1 1 1 1 0 0 0 1
    1 1 1 0 0 0 1 1
    1 1 0 0 0 1 1 1
    0 0 0 0 1 1 1 1
    0 0 0 1 1 1 1 1
    0 0 1 1 1 1 1 0
    0 1 1 1 1 1 0 0

Each motif cell scales to `cellSize` pixels (default 4 → 32
px tile), so a 256x256 texture shows 8 motifs in each axis.
Tile-seam-perfect: no row offset or fractional pixel issues
since lookup is integer mod 8.

Useful for noble-house tabard accents, formal-attire trim,
upholstery in palace dining rooms, drapes / wall hangings,
gentry-quarter banners. Distinct from --gen-texture-tartan
(weighted multi-color stripes) and --gen-texture-checker
(simple binary squares) — houndstooth has the iconic
4-pointed "tooth" silhouette.
This commit is contained in:
Kelsi 2026-05-09 12:52:31 -07:00
parent 4e64f833a7
commit 30e58ae0b2
3 changed files with 66 additions and 0 deletions
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63
tools/editor/cli_gen_texture.cpp
View file

@ -3500,6 +3500,68 @@ int handleKnit(int& i, int argc, char** argv) {
return 0;
}
int handleHoundstooth(int& i, int argc, char** argv) {
// Houndstooth: classic textile broken-check pattern. The 8x8
// motif stored below tiles seamlessly to produce the
// unmistakable 4-pointed tooth shape that 19th-century
// Scottish weavers gave us. Each motif cell scales to
// `cellSize` pixels (default 4 → 32x32 tile = 4 motifs side-
// to-side at 256x256).
std::string outPath = argv[++i];
std::string aHex = argv[++i]; // tooth color
std::string bHex = argv[++i]; // background color
int cellSize = 4;
int W = 256, H = 256;
parseOptInt(i, argc, argv, cellSize);
parseOptInt(i, argc, argv, W);
parseOptInt(i, argc, argv, H);
if (W < 1 || H < 1 || W > 8192 || H > 8192 ||
cellSize < 1 || cellSize > 256) {
std::fprintf(stderr,
"gen-texture-houndstooth: invalid dims (W/H 1..8192, "
"cellSize 1..256)\n");
return 1;
}
uint8_t ar, ag, ab, br_, bg_, bb_;
if (!parseHexOrError(aHex, ar, ag, ab,
"gen-texture-houndstooth")) return 1;
if (!parseHexOrError(bHex, br_, bg_, bb_,
"gen-texture-houndstooth")) return 1;
// The classic 8x8 houndstooth motif. 1 = tooth color, 0 = bg.
// Tiles seamlessly in both axes.
static const uint8_t motif[8][8] = {
{1, 1, 1, 1, 0, 0, 0, 0},
{1, 1, 1, 1, 0, 0, 0, 1},
{1, 1, 1, 0, 0, 0, 1, 1},
{1, 1, 0, 0, 0, 1, 1, 1},
{0, 0, 0, 0, 1, 1, 1, 1},
{0, 0, 0, 1, 1, 1, 1, 1},
{0, 0, 1, 1, 1, 1, 1, 0},
{0, 1, 1, 1, 1, 1, 0, 0},
};
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
for (int y = 0; y < H; ++y) {
int motifY = (y / cellSize) % 8;
for (int x = 0; x < W; ++x) {
int motifX = (x / cellSize) % 8;
uint8_t r, g, b;
if (motif[motifY][motifX]) {
r = ar; g = ag; b = ab;
} else {
r = br_; g = bg_; b = bb_;
}
setPixelRGB(pixels, W, x, y, r, g, b);
}
}
if (!savePngOrError(outPath, W, H, pixels,
"gen-texture-houndstooth")) return 1;
printPngWrote(outPath, W, H);
std::printf(" tooth/bg : %s / %s\n", aHex.c_str(), bHex.c_str());
std::printf(" cell : %d px (8x8 motif → %d-px tile)\n",
cellSize, cellSize * 8);
return 0;
}
int handleDiamondGrid(int& i, int argc, char** argv) {
// Axis-aligned grid of solid diamond shapes (no row offset)
// separated by visible bg gaps. Distinct from
@ -4882,6 +4944,7 @@ constexpr TextureEntry kTextureTable[] = {
{"--gen-texture-rust-streaks", 3, handleRustStreaks},
{"--gen-texture-plaid", 3, handlePlaid},
{"--gen-texture-diamond-grid", 3, handleDiamondGrid},
{"--gen-texture-houndstooth", 3, handleHoundstooth},
};
} // namespace