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Use correct roughness for indirect specular lighting;

This commit is contained in:
bjorn 2022-09-23 23:58:47 -07:00
parent d905b649a4
commit cd04060467
1 changed files with 10 additions and 8 deletions
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18
etc/shaders/lovr.glsl
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@ -185,6 +185,7 @@ struct Surface {
vec3 diffuse;
vec3 emissive;
float metalness;
float roughness;
float roughness2;
float occlusion;
float clearcoat;
@ -248,10 +249,10 @@ void initSurface(out Surface surface) {
surface.emissive = Material.glow.rgb * Material.glow.a;
if (flag_glow && flag_glowTexture) surface.emissive *= getPixel(GlowTexture, UV).rgb;
float roughness = Material.roughness;
if (flag_roughnessTexture) roughness *= getPixel(RoughnessTexture, UV).g;
roughness = max(roughness, .05);
surface.roughness2 = roughness * roughness;
surface.roughness = Material.roughness;
if (flag_roughnessTexture) surface.roughness *= getPixel(RoughnessTexture, UV).g;
surface.roughness = max(surface.roughness, .05);
surface.roughness2 = surface.roughness * surface.roughness;
surface.occlusion = 1.;
if (flag_ambientOcclusion) surface.occlusion *= getPixel(OcclusionTexture, UV).r * Material.occlusionStrength;
@ -265,7 +266,7 @@ void initSurface(out Surface surface) {
}
float D_GGX(const Surface surface, float NoH) {
float alpha2 = surface.roughness2 * surface.roughness2;
float alpha2 = surface.roughness * surface.roughness2;
float denom = (NoH * NoH) * (alpha2 - 1.) + 1.;
return alpha2 / (PI * denom * denom);
}
@ -336,11 +337,12 @@ vec3 evaluateSphericalHarmonics(vec3 sh[9], vec3 n) {
vec3 getIndirectLighting(const Surface surface, textureCube environment, vec3 sphericalHarmonics[9]) {
float NoV = dot(surface.normal, surface.view);
float roughness = surface.roughness2;
vec2 lookup = prefilteredBRDF(NoV, roughness);
vec2 lookup = prefilteredBRDF(NoV, surface.roughness);
int mipmapCount = textureQueryLevels(samplerCube(environment, Sampler));
vec3 specular = (surface.f0 * lookup.r + lookup.g) * textureLod(samplerCube(environment, Sampler), surface.reflection, roughness * mipmapCount).rgb;
vec3 ibl = textureLod(samplerCube(environment, Sampler), surface.reflection, surface.roughness * mipmapCount).rgb;
vec3 specular = (surface.f0 * lookup.r + lookup.g) * ibl;
vec3 sh = evaluateSphericalHarmonics(sphericalHarmonics, surface.normal);
vec3 diffuse = surface.diffuse * surface.occlusion * sh;