mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 14:46:53 +00:00
40 lines
1.0 KiB
Plaintext
40 lines
1.0 KiB
Plaintext
|
ps.1.4
|
||
|
|
|
||
|
|
; Get the 3-vector from the normal map
|
||
|
|
texld r0, t0
|
||
|
|
; Get environment matrix
|
||
|
|
texcrd r1.rgb, t1
|
||
|
|
texcrd r2.rgb, t2
|
||
|
|
texcrd r3.rgb, t3
|
||
|
|
; Normalize eye-ray vector through normalizer cube map
|
||
|
|
texld r4, t4 ; <---- CUBE MAP here!!!
|
||
|
|
|
||
|
|
; Transform normal
|
||
|
|
dp3 r5.r, r1, r0_bx2
|
||
|
|
dp3 r5.g, r2, r0_bx2
|
||
|
|
dp3 r5.b, r3, r0_bx2
|
||
|
|
; Reflection calculatiom
|
||
|
|
dp3_x2 r3.rgb, r5, r4_bx2 ; 2(N.Eye)
|
||
|
|
mul r3.rgb, r5, r3 ; 2N(N.Eye)
|
||
|
|
dp3 r2.rgb, r5, r5 ; N.N
|
||
|
|
mad r2.rgb, -r4_bx2, r2, r3 ; 2N(N.Eye) - Eye(N.N)
|
||
|
|
|
||
|
|
phase
|
||
|
|
|
||
|
|
; Sample environment map
|
||
|
|
texld r3, r2
|
||
|
|
texld r4, t5 ; Normalize the tangent-space eye vector
|
||
|
|
|
||
|
|
; dot eye-vector with per-pixel normal from r0
|
||
|
|
dp3_sat r1, r4_bx2, r0_bx2
|
||
|
|
|
||
|
|
; run Fresnel approx. on it: R0 + (1-R0) (1-cos(q))^5 in alpha channel
|
||
|
|
mul r0.a, 1-r1.a, 1-r1.a ; squared
|
||
|
|
mul r0.a, r0.a, r0.a ; quartic
|
||
|
|
mul_sat r1.a, r0.a, 1-r1.a ; quintic
|
||
|
|
|
||
|
|
; multiply color by reflecttint
|
||
|
|
mul r0, r3, c1
|
||
|
|
|
||
|
|
; blend between reflected color and fog color based on fresnel
|
||
|
|
lrp r0.rgb, r1.a, r0, c0
|