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rt: sample all polygon light sources in cluster

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This commit is contained in:
Ivan Avdeev 2022-01-19 20:23:38 -08:00
parent 460b839a64
commit c73f3d0dab
1 changed files with 41 additions and 4 deletions
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45
ref_vk/shaders/light_polygon.glsl
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@ -214,27 +214,63 @@ void sampleEmissiveSurfaces(vec3 P, vec3 N, vec3 throughput, vec3 view_dir, Mate
}
#endif
// FIXME this is a quick test that reading new lights is possible
void sampleEmissiveSurfaces(vec3 P, vec3 N, vec3 throughput, vec3 view_dir, MaterialProperties material, uint cluster_index, inout vec3 diffuse, inout vec3 specular) {
#define DO_ALL_IN_CLUSTER 1
#if DO_ALL_IN_CLUSTER
const SampleContext ctx = buildSampleContext(P, N, view_dir);
const uint num_polygons = min(128, uint(light_grid.clusters[cluster_index].num_polygons));
for (uint i = 0; i < num_polygons; ++i) {
const uint index = uint(light_grid.clusters[cluster_index].polygons[i]);
const PolygonLight poly = lights.polygons[index];
if (false)
{
const vec3 dir = poly.center - P;
const vec3 light_dir = normalize(dir);
if (dot(-light_dir, poly.plane.xyz) <= 0.f)
continue;
}
const vec4 light_sample_dir = getPolygonLightSample(P, N, view_dir, ctx, poly);
if (light_sample_dir.w <= 0.)
continue;
const float dist = - dot(vec4(P, 1.f), poly.plane) / dot(light_sample_dir.xyz, poly.plane.xyz);
const vec3 emissive = poly.emissive;
//if (true) {//!shadowed(P, light_sample_dir.xyz, dist)) {
if (!shadowed(P, light_sample_dir.xyz, dist)) {
//const float estimate = total_contrib;
const float estimate = light_sample_dir.w / 10; // FIXME WTF is this fudge
vec3 poly_diffuse = vec3(0.), poly_specular = vec3(0.);
evalSplitBRDF(N, light_sample_dir.xyz, view_dir, material, poly_diffuse, poly_specular);
diffuse += throughput * emissive * estimate;
specular += throughput * emissive * estimate;
}
}
#else
// TODO move this to pickPolygonLight function
const uint num_polygons = uint(light_grid.clusters[cluster_index].num_polygons);
//const uint num_polygons = uint(light_grid.clusters[cluster_index].num_polygons);
const uint num_polygons = lights.num_polygons;
uint selected = 0;
float total_contrib = 0.;
float eps1 = rand01();
for (uint i = 0; i < num_polygons; ++i) {
const uint index = uint(light_grid.clusters[cluster_index].polygons[i]);
//const uint index = uint(light_grid.clusters[cluster_index].polygons[i]);
const uint index = i;
const PolygonLight poly = lights.polygons[index];
const vec3 dir = poly.center - P;
const vec3 light_dir = normalize(dir);
const float contrib_estimate = poly.area * dot(-light_dir, poly.plane.xyz) / dot(dir, dir);
float contrib_estimate = poly.area * dot(-light_dir, poly.plane.xyz) / (1e-3 + dot(dir, dir));
if (contrib_estimate < 1e-6)
continue;
contrib_estimate = 1.f;
const float tau = total_contrib / (total_contrib + contrib_estimate);
total_contrib += contrib_estimate;
@ -278,4 +314,5 @@ void sampleEmissiveSurfaces(vec3 P, vec3 N, vec3 throughput, vec3 view_dir, Mate
specular += throughput * emissive * estimate;
}
#endif
#endif
}