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32 lines
1019 B
32 lines
1019 B
ps.1.1 |
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;------------------------------------------------------------------------------ |
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; Environment mapping on a bumped surface |
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; t0 - Normalmap |
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; t3 - Cube environment map (*must* be a cube map!) |
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; |
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; c0 - color to multiply the results by |
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; Input texture coords required here are a little wonky. |
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; tc0.uv <- U,V into the normal map |
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; tc1.uvw, tc2.uvw, tc3.uvw <- 3x3 matrix transform |
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; from tangent space->env map space |
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; tc1.q, tc2.q, tc3.q <- eye vector in env map space |
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;------------------------------------------------------------------------------ |
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; Get the 3-vector from the normal map |
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tex t0 |
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; Perform matrix multiply to get a local normal bump. Then |
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; reflect the eye vector through the normal and sample from |
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; a cubic environment map. |
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texm3x3pad t1, t0_bx2 |
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texm3x3pad t2, t0_bx2 |
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texm3x3vspec t3, t0_bx2 |
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; result goes in output color (multiply by constant color c0) |
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mul r0, t3, c0 |
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; The output alpha comes from the normal map. |
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mov r0.w, t0.a ; don't need this if we aren't alpha blending! |
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