Team Fortress 2 Source Code as on 22/4/2020
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ps.1.1
;------------------------------------------------------------------------------; Environment mapping on a bumped surface; t0 - Normalmap; t3 - Cube environment map (*must* be a cube map!);; c0 - color to multiply the results by; Input texture coords required here are a little wonky.; tc0.uv <- U,V into the normal map; tc1.uvw, tc2.uvw, tc3.uvw <- 3x3 matrix transform ; from tangent space->env map space; tc1.q, tc2.q, tc3.q <- eye vector in env map space;------------------------------------------------------------------------------; This version doesn't multiply by lighting.
; Get the 3-vector from the normal maptex t0
; Perform matrix multiply to get a local normal bump. Then; reflect the eye vector through the normal and sample from ; a cubic environment map.texm3x3pad t1, t0_bx2texm3x3pad t2, t0_bx2 texm3x3vspec t3, t0_bx2
; result goes in output color (multiply by constant color c0)mul r0, t3, c0
; Multiply the output color by the alpha channel of the normal map.mul r0.rgb, t0.a, r0
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