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https://github.com/nillerusr/source-engine.git
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31 lines
731 B
Plaintext
31 lines
731 B
Plaintext
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ps.1.4
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; Get the 3-vector from the normal map
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texld r0, t0
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; Get environment matrix
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texcrd r1.rgb, t1
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texcrd r2.rgb, t2
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texcrd r3.rgb, t3
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; Normalize eye-ray vector through normalizer cube map
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texld r4, t4 ; <---- CUBE MAP here!!!
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; Transform normal
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dp3 r5.r, r1, r0_bx2
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dp3 r5.g, r2, r0_bx2
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dp3 r5.b, r3, r0_bx2
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; Reflection calculatiom
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dp3_x2 r3.rgb, r5, r4_bx2 ; 2(N.Eye)
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mul r3.rgb, r5, r3 ; 2N(N.Eye)
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dp3 r2.rgb, r5, r5 ; N.N
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mad r2.rgb, -r4_bx2, r2, r3 ; 2N(N.Eye) - Eye(N.N)
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phase
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; Sample environment map
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texld r3, r2
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; multiply color by reflecttint
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mul r0.rgb, r3, c1
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+mov_sat r0.a, v0.a ; Necessary since v0.a may be negative
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add_sat r0.a, c1.a, r0.a
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