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DolphinTween.vsh
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Text File
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2001-10-08
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2KB
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74 lines
;------------------------------------------------------------------------------
; Constants specified by the app
; c0 = ( 0, 0, 0, 0 )
; c1 = ( 1, 0.5, 2, 4 )
; c2 = ( fWeight1, fWeight2, fWeight3, 0 )
; c4-c7 = matWorldViewProjection
; c8-c11 = matWorldView
; c19 = light direction (in model space)
; c21 = material diffuse color * light diffuse color
; c22 = material ambient color
;
; Vertex components (as specified in the vertex DECL)
; v0 = Position
; v3 = Normal
; v6 = Texcoords
;------------------------------------------------------------------------------
vs.1.1
;------------------------------------------------------------------------------
; Vertex transformation
;------------------------------------------------------------------------------
; Tween the 3 positions (v0,v1,v2) into one position
mul r0, v0, c2.x
mul r1, v1, c2.y
mul r2, v2, c2.z
add r3, r0, r1
add r3, r3, r2
; Transform position to the clipping space
m4x4 oPos, r3, c4
; Transform position to the camera space
m4x4 r9, r3, c8
;------------------------------------------------------------------------------
; Lighting calculation
;------------------------------------------------------------------------------
; Tween the 3 normals (v3,v4,v5) into one normal
mul r0, v3, c2.x
mul r1, v4, c2.y
mul r2, v5, c2.z
add r3, r0, r1
add r3, r3, r2
; Do the lighting calculation
dp3 r1.x, r3, c19 ; r1 = normal dot light
max r1.x, r1.x, c0.x ; if dot < 0 then dot = 0
mul r0, r1.x, c21 ; Multiply with diffuse
add r0, r0, c22 ; Add in ambient
min oD0, r0, c1.x ; clamp if > 1
;------------------------------------------------------------------------------
; Texture coordinates
;------------------------------------------------------------------------------
; Copy tex coords
mov oT0.xy, v6
;------------------------------------------------------------------------------
; Fog calculation
;------------------------------------------------------------------------------
; compute fog factor f = (fog_end - dist)*(1/(fog_end-fog_start))
add r0.x, -r9.z, c23.y
mul r0.x, r0.x, c23.z
max r0.x, r0.x, c0.x ; clamp fog to > 0.0
min oFog.x, r0.x, c1.x ; clamp fog to < 1.0