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softgpu: Implement environment mapping.

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This commit is contained in:
Tony Wasserka 2013-07-24 14:35:52 +02:00 committed by neobrain
parent d2f30961af
commit 1450157e09
2 changed files with 23 additions and 0 deletions
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14
GPU/Software/Lighting.cpp
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@ -35,6 +35,20 @@ void Process(VertexData& vertex)
Vec3<int> specular_color(0, 0, 0);
for (unsigned int light = 0; light < 4; ++light) {
// Always calculate texture coords from lighting results if environment mapping is active
// TODO: specular lighting should affect this, too!
if (gstate.getUVGenMode() == GE_TEXMAP_ENVIRONMENT_MAP) {
Vec3<float> L = Vec3<float>(getFloat24(gstate.lpos[3*light]&0xFFFFFF), getFloat24(gstate.lpos[3*light+1]&0xFFFFFF),getFloat24(gstate.lpos[3*light+2]&0xFFFFFF));
float diffuse_factor = Dot(L,vertex.worldnormal) / L.Length() / vertex.worldnormal.Length();
if (gstate.getUVLS0() == light)
vertex.texturecoords.s() = (diffuse_factor + 1.f) / 2.f;
if (gstate.getUVLS1() == light)
vertex.texturecoords.t() = (diffuse_factor + 1.f) / 2.f;
}
// Skip other calculations if light chan is disabled
if (!gstate.isLightChanEnabled(light))
continue;

9
GPU/Software/Rasterizer.cpp
View File

@ -472,6 +472,15 @@ void DrawTriangle(const VertexData& v0, const VertexData& v1, const VertexData&
Vec3<float> stq = tgen * source + Vec3<float>(gstate.tgenMatrix[9], gstate.tgenMatrix[10], gstate.tgenMatrix[11]);
uv_map(0, stq.x/stq.z, stq.y/stq.z, u, v);
} else if (gstate.getUVGenMode() == GE_TEXMAP_ENVIRONMENT_MAP) {
// environment mapping - ST coordinates are calculated during Lighting
float q0 = 1.f / v0.clippos.w;
float q1 = 1.f / v1.clippos.w;
float q2 = 1.f / v2.clippos.w;
float q = q0 * w0 + q1 * w1 + q2 * w2;
float s = (v0.texturecoords.s() * q0 * w0 + v1.texturecoords.s() * q1 * w1 + v2.texturecoords.s() * q2 * w2) / q;
float t = (v0.texturecoords.t() * q0 * w0 + v1.texturecoords.t() * q1 * w1 + v2.texturecoords.t() * q2 * w2) / q;
uv_map(0, s, t, u, v);
} else {
ERROR_LOG(G3D, "Unsupported texture mapping mode %x!", gstate.getUVGenMode());
}