Function dev_texture

StereoKitC/systems/defaults.cpp:80–117

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tex_t dev_texture(const char *id, color128 base_color, float contrast_boost) {
	tex_t result = tex_create();
	tex_set_id(result, id);

	const int32_t size          = 256;                 // Texture total size
	const int32_t slices        = 4;                   // Slice this up into 4x4 squares
	const int32_t slice_size    = size / slices;       // Size in px of each square
	const int32_t slice_half    = slice_size/2;        // precalculate half (for lines)
	const int32_t slice_quarter = slice_size/4;        // precalculate quarter (for lines)
	const int32_t checker_size  = size / (slices * 2); // Alternate core color in a checker pattern, with 2 checkers per slice

	vec3 lab = color_to_lab(base_color);
	color32 core_color  = color_to_32(base_color);
	color32 core_color2 = color_to_32(color_lab(lab.x * powf(0.9f,  contrast_boost), lab.y, lab.z, 1));
	color32 line_color  = color_to_32(color_lab(lab.x * powf(0.8f,  contrast_boost), lab.y, lab.z, 1));
	color32 line2_color = color_to_32(color_lab(lab.x * powf(0.75f, contrast_boost), lab.y, lab.z, 1));

	color32 *data = sk_malloc_t(color32, size * size);
	for (int32_t y = 0; y < size; y++) {
		int ydist  = abs(slice_half    - ((y + slice_half   ) % slice_size));
		int ydist2 = abs(slice_quarter - ((y + slice_quarter) % slice_half));

		for (int32_t x = 0; x < size; x++) {
			int xdist  = abs(slice_half    - ((x + slice_half   ) % slice_size));
			int xdist2 = abs(slice_quarter - ((x + slice_quarter) % slice_half));

			int32_t i = x + y * size;
			if      (xdist < 2 || ydist <2) data[i] = line_color;
			else if (xdist2< 1 || ydist2<1) data[i] = line2_color;
			else                            data[i] = ((x/checker_size) + (y/checker_size)) %2 == 0 ? core_color : core_color2;
		}
	}

	tex_set_colors(result, size, size, data);
	sk_free(data);

	return result;
}

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