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Properly remap roughness when reading from radiance map

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This ensures that we consistently use perceptual roughness which matches the behaviour of most other PBR renderers like Blender, Ue4 and Godot 3
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clayjohn 2022-12-02 15:39:20 -08:00
parent cdd99e9bec
commit b2b89d7294
5 changed files with 10 additions and 19 deletions
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drivers/gles3/shaders/scene.glsl
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@ -1100,7 +1100,7 @@ void main() {
ref_vec = mix(ref_vec, normal, roughness * roughness);
float horizon = min(1.0 + dot(ref_vec, normal), 1.0);
ref_vec = scene_data.radiance_inverse_xform * ref_vec;
specular_light = textureLod(radiance_map, ref_vec, roughness * RADIANCE_MAX_LOD).rgb;
specular_light = textureLod(radiance_map, ref_vec, sqrt(roughness) * RADIANCE_MAX_LOD).rgb;
specular_light = srgb_to_linear(specular_light);
specular_light *= horizon * horizon;
specular_light *= scene_data.ambient_light_color_energy.a;