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SoftGPU: Normalize 0,0,0 as 0,0,1 for shade map.

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Takes care of #4155 for software rendering.
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Unknown W. Brackets 2018-11-17 18:16:54 -08:00
parent 6600896312
commit 986371c633
1 changed files with 2 additions and 1 deletions
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3
GPU/Software/Lighting.cpp
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@ -38,7 +38,8 @@ void Process(VertexData& vertex, bool hasColor)
// TODO: Not sure if this really should be done even if lighting is disabled altogether
if (gstate.getUVGenMode() == GE_TEXMAP_ENVIRONMENT_MAP) {
Vec3<float> L = Vec3<float>(getFloat24(gstate.lpos[3 * light]), getFloat24(gstate.lpos[3 * light + 1]),getFloat24(gstate.lpos[3 * light + 2]));
float diffuse_factor = Dot(L.Normalized(), vertex.worldnormal);
// In other words, L.Length() == 0.0f means Dot({0, 0, 1}, worldnormal).
float diffuse_factor = L.Length() == 0.0f ? vertex.worldnormal.z : Dot(L.Normalized(), vertex.worldnormal);
if (gstate.getUVLS0() == (int)light)
vertex.texturecoords.s() = (diffuse_factor + 1.f) / 2.f;