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/** Storing/merging and sorting cryptomatte samples. */
bool cryptomatte_can_merge_sample(vec2 dst, vec2 src)
{
if (dst == vec2(0.0, 0.0)) {
return true;
}
if (dst.x == src.x) {
return true;
}
return false;
}
vec2 cryptomatte_merge_sample(vec2 dst, vec2 src)
{
return vec2(src.x, dst.y + src.y);
}
vec4 cryptomatte_false_color(float hash)
{
uint m3hash = floatBitsToUint(hash);
return vec4(hash,
float(m3hash << 8) / float(0xFFFFFFFFu),
float(m3hash << 16) / float(0xFFFFFFFFu),
1.0);
}
void cryptomatte_clear_samples(FilmSample dst)
{
int layer_len = imageSize(cryptomatte_img).z;
for (int i = 0; i < layer_len; i++) {
imageStore(cryptomatte_img, ivec3(dst.texel, i), vec4(0.0));
}
}
void cryptomatte_store_film_sample(FilmSample dst,
int cryptomatte_layer_id,
vec2 crypto_sample,
out vec4 out_color)
{
if (crypto_sample.y == 0.0) {
return;
}
for (int i = 0; i < film_buf.cryptomatte_samples_len / 2; i++) {
ivec3 img_co = ivec3(dst.texel, cryptomatte_layer_id + i);
vec4 sample_pair = imageLoad(cryptomatte_img, img_co);
if (cryptomatte_can_merge_sample(sample_pair.xy, crypto_sample)) {
sample_pair.xy = cryptomatte_merge_sample(sample_pair.xy, crypto_sample);
/* In viewport only one layer is active. */
/* TODO(jbakker): we are displaying the first sample, but we should display the highest
* weighted one. */
if (cryptomatte_layer_id + i == 0) {
out_color = cryptomatte_false_color(sample_pair.x);
}
}
else if (cryptomatte_can_merge_sample(sample_pair.zw, crypto_sample)) {
sample_pair.zw = cryptomatte_merge_sample(sample_pair.zw, crypto_sample);
}
else if (i == film_buf.cryptomatte_samples_len / 2 - 1) {
/* TODO(jbakker): New hash detected, but there is no space left to store it. Currently we
* will ignore this sample, but ideally we could replace a sample with a lowest weight. */
continue;
}
else {
continue;
}
// sample_pair = vec4(1.0, 2.0, 3.0, 4.0);
imageStore(cryptomatte_img, img_co, sample_pair);
break;
}
}
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