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LightmapGI: Pack L1 SH coefficients before denoising

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This commit is contained in:
BlueCube3310
2025-08-26 00:28:43 +02:00
parent b79fe2e020
commit de9b22625e
3 changed files with 26 additions and 31 deletions
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37
modules/lightmapper_rd/lm_compute.glsl
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@ -82,6 +82,7 @@ layout(set = 1, binding = 4) uniform DenoiseParams {
int half_search_window;
float filter_strength;
uint slice_count;
}
denoise_params;
#endif
@ -1193,13 +1194,9 @@ void main() {
const float FILTER_SQUARE_TWO_SIGMA_LIGHT_SQUARE = FILTER_VALUE * FILTER_VALUE * TWO_SIGMA_LIGHT_SQUARE;
const float EPSILON = 1e-6f;
#ifdef USE_SH_LIGHTMAPS
const uint slice_count = 4;
const uint slice_count = denoise_params.slice_count;
const uint slice_base = params.atlas_slice * slice_count;
#else
const uint slice_count = 1;
const uint slice_base = params.atlas_slice;
#endif
const bool is_directional = (slice_count == 4);
for (uint i = 0; i < slice_count; i++) {
uint lightmap_slice = slice_base + i;
@ -1223,9 +1220,16 @@ void main() {
for (int offset_x = -HALF_PATCH_WINDOW; offset_x <= HALF_PATCH_WINDOW; offset_x++) {
ivec2 offset_input_pos = atlas_pos + ivec2(offset_x, offset_y);
ivec2 offset_search_pos = search_pos + ivec2(offset_x, offset_y);
vec3 offset_input_rgb = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(offset_input_pos, lightmap_slice), 0).rgb;
vec3 offset_search_rgb = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(offset_search_pos, lightmap_slice), 0).rgb;
vec3 offset_input_rgb = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(offset_input_pos, slice_base), 0).rgb;
vec3 offset_search_rgb = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(offset_search_pos, slice_base), 0).rgb;
vec3 offset_delta_rgb = offset_input_rgb - offset_search_rgb;
if (is_directional) {
// Since L0 data is 1/4 the value of a regular lightmap,
// we have to multiply it by 4.
offset_delta_rgb *= 4.0;
}
patch_square_dist += dot(offset_delta_rgb, offset_delta_rgb) - TWO_SIGMA_LIGHT_SQUARE;
}
}
@ -1280,24 +1284,13 @@ void main() {
#ifdef MODE_PACK_L1_COEFFS
vec4 base_coeff = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(atlas_pos, params.atlas_slice * 4), 0);
imageStore(dest_light, ivec3(atlas_pos, params.atlas_slice * 4), base_coeff);
for (int i = 1; i < 4; i++) {
vec4 c = texelFetch(sampler2DArray(source_light, linear_sampler), ivec3(atlas_pos, params.atlas_slice * 4 + i), 0);
c.rgb /= (base_coeff.rgb * 8.0 + vec3(1e-6f));
c.rgb = clamp(c.rgb + vec3(0.5), vec3(0.0), vec3(1.0));
if (abs(base_coeff.r) > 0.0) {
c.r /= (base_coeff.r * 8);
}
if (abs(base_coeff.g) > 0.0) {
c.g /= (base_coeff.g * 8);
}
if (abs(base_coeff.b) > 0.0) {
c.b /= (base_coeff.b * 8);
}
c.rgb += vec3(0.5);
c.rgb = clamp(c.rgb, vec3(0.0), vec3(1.0));
imageStore(dest_light, ivec3(atlas_pos, params.atlas_slice * 4 + i), c);
}
#endif