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feat(editor): add --gen-texture-gingham 3-tone fabric pattern

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40th procedural texture: classic gingham picnic-blanket /
shirt fabric — two perpendicular sets of stripes with a
darker color where they cross. The crossing creates the
characteristic 3-tone checker pattern that's distinct from
plain --gen-texture-checker (solid blocks).

Useful for picnic blankets, country tablecloths, NPC shirt
textures, fabric set dressing. Defaults to 16-px stripe
spacing with 8-px stripe width (50% coverage per axis).
This commit is contained in:
Kelsi 2026-05-09 08:24:12 -07:00
parent 05350becbc
commit 84403027ae
3 changed files with 83 additions and 1 deletions
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80
tools/editor/cli_gen_texture.cpp
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@ -3810,6 +3810,83 @@ int handleSpiderWeb(int& i, int argc, char** argv) {
return 0;
}
int handleGingham(int& i, int argc, char** argv) {
// Gingham: classic picnic-blanket / shirt fabric pattern.
// Two perpendicular sets of stripes (horizontal + vertical)
// with a darker color where they cross. The crossing creates
// the characteristic 3-tone checker that gingham is known
// for, distinct from --gen-texture-checker (solid blocks).
std::string outPath = argv[++i];
std::string bgHex = argv[++i];
std::string stripeHex = argv[++i];
std::string crossHex = argv[++i];
int stripeSpacing = 16;
int stripeWidth = 8;
int W = 256, H = 256;
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { stripeSpacing = std::stoi(argv[++i]); } catch (...) {}
}
if (i + 1 < argc && argv[i + 1][0] != '-') {
try { stripeWidth = 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 ||
stripeSpacing < 4 || stripeSpacing > 256 ||
stripeWidth < 1 || stripeWidth >= stripeSpacing) {
std::fprintf(stderr,
"gen-texture-gingham: invalid dims (W/H 1..8192, spacing 4..256, width 1..spacing-1)\n");
return 1;
}
uint8_t br_, bg_, bb_, sr, sg, sb_, cr_, cg_, cb_;
if (!parseHex(bgHex, br_, bg_, bb_) ||
!parseHex(stripeHex, sr, sg, sb_) ||
!parseHex(crossHex, cr_, cg_, cb_)) {
std::fprintf(stderr,
"gen-texture-gingham: bg/stripe/cross hex color is invalid\n");
return 1;
}
std::vector<uint8_t> pixels(static_cast<size_t>(W) * H * 3, 0);
for (int y = 0; y < H; ++y) {
bool inHStripe = ((y % stripeSpacing) < stripeWidth);
for (int x = 0; x < W; ++x) {
bool inVStripe = ((x % stripeSpacing) < stripeWidth);
uint8_t r, g, b;
if (inHStripe && inVStripe) {
// Crossing region: darkest of the three colors.
r = cr_; g = cg_; b = cb_;
} else if (inHStripe || inVStripe) {
// Single-direction stripe band.
r = sr; g = sg; b = sb_;
} else {
r = br_; g = bg_; b = bb_;
}
size_t idx = (static_cast<size_t>(y) * W + x) * 3;
pixels[idx + 0] = r;
pixels[idx + 1] = g;
pixels[idx + 2] = b;
}
}
if (!stbi_write_png(outPath.c_str(), W, H, 3,
pixels.data(), W * 3)) {
std::fprintf(stderr,
"gen-texture-gingham: 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/stripe/cross : %s / %s / %s\n",
bgHex.c_str(), stripeHex.c_str(), crossHex.c_str());
std::printf(" spacing : %d px (stripe width %d)\n",
stripeSpacing, stripeWidth);
return 0;
}
} // namespace
bool handleGenTexture(int& i, int argc, char** argv, int& outRc) {
@ -3932,6 +4009,9 @@ bool handleGenTexture(int& i, int argc, char** argv, int& outRc) {
if (std::strcmp(argv[i], "--gen-texture-spider-web") == 0 && i + 3 < argc) {
outRc = handleSpiderWeb(i, argc, argv); return true;
}
if (std::strcmp(argv[i], "--gen-texture-gingham") == 0 && i + 4 < argc) {
outRc = handleGingham(i, argc, argv); return true;
}
return false;
}