mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-23 14:46:53 +00:00
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
|
ps.1.1
|
||
|
|
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
; Sphere-lit particle pixel shader.
|
||
|
|
;
|
||
|
|
; The ParticleSphere lighting equation is:
|
||
|
|
; A + [[N dot |L - P|] * 0.5 + 0.5] * C * r / ||L - P||
|
||
|
|
;
|
||
|
|
; where:
|
||
|
|
; A = ambient light color
|
||
|
|
; N = particle normal (stored in the texture)
|
||
|
|
; L = light position
|
||
|
|
; P = point on surface
|
||
|
|
; C = directional light color
|
||
|
|
; r = directional light intensity
|
||
|
|
;
|
||
|
|
; This shader takes as input:
|
||
|
|
; t0 = Normal map texture coordinates (N)
|
||
|
|
; t1 = Light vector Normalize(L - P) * 0.5 in range [0,1]
|
||
|
|
; v0 = Directional color (C * r / ||L - P||^2) * 0.5
|
||
|
|
; t2 = Ambient light color (A)
|
||
|
|
; c0 = 0.5
|
||
|
|
;
|
||
|
|
; and outputs [v1 + (sample(t0) dot t1) * 0.5f + 0.5f]
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
tex t0 ; Get the 3-vector from the normal map
|
||
|
|
texcoord t1 ; Interpret tcoord t1 as color data.
|
||
|
|
texcoord t2 ; Ambient light color
|
||
|
|
|
||
|
|
dp3 r1, t0_bx2, t1_bx2 ; r0 = sample(t0) dot t1
|
||
|
|
add r0, r1, c0 ; + 0.5
|
||
|
|
|
||
|
|
mul r1, v0, r0 ; scale the dot product by the dirlight's actual color
|
||
|
|
add r0.rgb, r1, t2 ; add the ambient color in v1
|
||
|
|
|
||
|
|
mul r0.a, t0, v0 ; Alpha = normal map alpha * vertex alpha
|
||
|
|
|
||
|
|
|