Differential D15753 Diff 55618 source/blender/draw/engines/eevee_next/shaders/eevee_film_cryptomatte_post_comp.glsl

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source/blender/draw/engines/eevee_next/shaders/eevee_film_cryptomatte_post_comp.glsl

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				#pragma BLENDER_REQUIRE(common_math_lib.glsl)

				#define CRYPTOMATTE_LEVELS_MAX 16

				void cryptomatte_load_samples(ivec2 texel, int layer, out vec2 samples[CRYPTOMATTE_LEVELS_MAX])
				{
				int pass_len = divide_ceil(cryptomatte_samples_per_layer, 2);
				int layer_id = layer * pass_len;

				/* Read all samples from the cryptomatte layer. */
				for (int p = 0; p < pass_len; p++) {
				vec4 pass_sample = imageLoad(cryptomatte_img, ivec3(texel, p + layer_id));
				samples[p * 2] = pass_sample.xy;
				samples[p * 2 + 1] = pass_sample.zw;
				}
				for (int i = pass_len * 2; i < CRYPTOMATTE_LEVELS_MAX; i++) {
				samples[i] = vec2(0.0);
				}
				}

				void cryptomatte_sort_samples(inout vec2 samples[CRYPTOMATTE_LEVELS_MAX])
				{
				/* Sort samples. Lame implementation, can be replaced with a more efficient algorithm. */
				for (int i = 0; i < cryptomatte_samples_per_layer - 1 && samples[i].y != 0.0; i++) {
				int highest_index = i;
				float highest_weight = samples[i].y;
				for (int j = i + 1; j < cryptomatte_samples_per_layer && samples[j].y != 0.0; j++) {
				if (samples[j].y > highest_weight) {
				highest_index = j;
				highest_weight = samples[j].y;
				}
				};

				if (highest_index != i) {
				vec2 tmp = samples[i];
				samples[i] = samples[highest_index];
				samples[highest_index] = tmp;
				}
				}
				}
				void cryptomatte_normalize_weight(float total_weight, inout vec2 samples[CRYPTOMATTE_LEVELS_MAX])
				{
				for (int i = 0; i < CRYPTOMATTE_LEVELS_MAX; i++) {
				samples[i].y /= total_weight;
				}
				}

				void cryptomatte_store_samples(ivec2 texel, int layer, in vec2 samples[CRYPTOMATTE_LEVELS_MAX])
				{
				int pass_len = divide_ceil(cryptomatte_samples_per_layer, 2);
				int layer_id = layer * pass_len;

				/* Store samples back to the cryptomatte layer. */
				for (int p = 0; p < pass_len; p++) {
				vec4 pass_sample;
				pass_sample.xy = samples[p * 2];
				pass_sample.zw = samples[p * 2 + 1];
				imageStore(cryptomatte_img, ivec3(texel, p + layer_id), pass_sample);
				}
				}

				void main()
				{
				ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
				for (int layer = 0; layer < cryptomatte_layer_len; layer++) {
				vec2 samples[CRYPTOMATTE_LEVELS_MAX];
				cryptomatte_load_samples(texel, layer, samples);
				cryptomatte_sort_samples(samples);
				/* Repeat texture coordinates as the weight can be optimized to a small portion of the film. */
				float weight = imageLoad(
				weight_img,
				ivec3(texel % imageSize(weight_img).xy, FILM_WEIGHT_LAYER_ACCUMULATION))
				.x;
				cryptomatte_normalize_weight(weight, samples);
				cryptomatte_store_samples(texel, layer, samples);
				}
				}