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Scene shader: Improve and document SH evaluation for light probes

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BlueCube3310 2025-04-18 16:45:28 +02:00
parent 215acd52e8
commit 5640ddd0a5
4 changed files with 58 additions and 46 deletions
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33
drivers/gles3/shaders/scene.glsl
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@ -2059,22 +2059,25 @@ void main() {
#ifndef DISABLE_LIGHTMAP
#ifdef USE_LIGHTMAP_CAPTURE
{
// The world normal.
vec3 wnormal = mat3(scene_data.inv_view_matrix) * normal;
const float c1 = 0.429043;
const float c2 = 0.511664;
const float c3 = 0.743125;
const float c4 = 0.886227;
const float c5 = 0.247708;
ambient_light += (c1 * lightmap_captures[8].rgb * (wnormal.x * wnormal.x - wnormal.y * wnormal.y) +
c3 * lightmap_captures[6].rgb * wnormal.z * wnormal.z +
c4 * lightmap_captures[0].rgb -
c5 * lightmap_captures[6].rgb +
2.0 * c1 * lightmap_captures[4].rgb * wnormal.x * wnormal.y +
2.0 * c1 * lightmap_captures[7].rgb * wnormal.x * wnormal.z +
2.0 * c1 * lightmap_captures[5].rgb * wnormal.y * wnormal.z +
2.0 * c2 * lightmap_captures[3].rgb * wnormal.x +
2.0 * c2 * lightmap_captures[1].rgb * wnormal.y +
2.0 * c2 * lightmap_captures[2].rgb * wnormal.z) *
// The SH coefficients used for evaluating diffuse data from SH probes.
const float c0 = 0.886227; // l0 sqrt(1.0/(4.0*PI)) * PI
const float c1 = 1.023327; // l1 sqrt(3.0/(4.0*PI)) * PI*2.0/3.0
const float c2 = 0.858086; // l2n2, l2n1, l2p1 sqrt(15.0/(4.0*PI)) * PI*1.0/4.0
const float c3 = 0.247708; // l20 sqrt(5.0/(16.0*PI)) * PI*1.0/4.0
const float c4 = 0.429043; // l2p2 sqrt(15.0/(16.0*PI))* PI*1.0/4.0
ambient_light += (c0 * lightmap_captures[0].rgb +
c1 * lightmap_captures[1].rgb * wnormal.y +
c1 * lightmap_captures[2].rgb * wnormal.z +
c1 * lightmap_captures[3].rgb * wnormal.x +
c2 * lightmap_captures[4].rgb * wnormal.x * wnormal.y +
c2 * lightmap_captures[5].rgb * wnormal.y * wnormal.z +
c3 * lightmap_captures[6].rgb * (3.0 * wnormal.z * wnormal.z - 1.0) +
c2 * lightmap_captures[7].rgb * wnormal.x * wnormal.z +
c4 * lightmap_captures[8].rgb * (wnormal.x * wnormal.x - wnormal.y * wnormal.y)) *
scene_data.emissive_exposure_normalization;
}
#else