Team Fortress 2 Source Code as on 22/4/2020
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ps.1.1
; 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
mul r0, t3, c1 ; envmap color * envmaptint
dp3_sat t2, v0_bx2, t0_bx2 ; dot eye-vector with per-pixel normal from t0
; run Fresnel approx. on it: R0 + (1-R0) (1-cos(q))^5 in alpha channel; NOTE: This is not perspective-correct and results in strange artifactsmul r1.a, 1-t2.a, 1-t2.a ; squaredmul r1.a, r1.a, r1.a ; quarticmul_sat r1.a, r1.a, 1-t2.a ; quintic
; t1.a is now the fresnel factorlrp r0.rgb, r1.a, r0, c0 ; blend between reflected color and fog color based on fresnel
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