tf2/tf2_src/materialsystem/stdshaders/LightmappedGeneric_Decal.psh

ps.1.1

;------------------------------------------------------------------------------
; Computes the diffuse component of lighting using lightmap + bumpmap
; t0 - decal texture
; t1 - Lightmap1
; t2 - Lightmap2
; t3 - Lightmap3
;
; The texture coordinates need to be defined as follows:
; tc0 - Normalmap and lightmap texture coordinates
; c0, c1, c2 - ( ( N dot basis[0] )^2 ), ( ( N dot basis[1] )^2 ), ( ( N dot basis[2] )^2 ) 
;------------------------------------------------------------------------------

; Get the decal color
tex t0

; Sample the lightmaps
tex t1 
tex t2 
tex t3 

; output = lightmapColor[0] * ( ( N dot basis[0] )^2 ) + 
;	       lightmapColor[1] * ( ( N dot basis[1] )^2 ) +
;	       lightmapColor[2] * ( ( N dot basis[2] )^2 ) +

; r0 = lightmapColor[0] * ( ( N dot basis[0] )^2 )
mul r0, t1, c0

; r0 = lightmapColor[0] * ( ( N dot basis[0] )^2 ) + lightmapColor[1] * ( ( N dot basis[1] )^2 )
mad r0, t2, c1, r0

; r0 =	lightmapColor[0] * ( ( N dot basis[0] )^2 ) + 
;		lightmapColor[1] * ( ( N dot basis[1] )^2 ) +
;		lightmapColor[2] * ( ( N dot basis[2] )^2 )
mad r0, t3, c2, r0

; Modulate by decal texture
mul r0.rgb, r0, t0
+ mov r0.a, t0.a

; Modulate by constant color
mul r0, r0, c3

; Modulate by per-vertex factor
mul r0, r0, v0