#include "..\..\VertexShader.h"

;------------------------------------------------------------------------------
; Defines
;------------------------------------------------------------------------------

#define C_EYE_POSITION			c10
#define C_LIGHT_POSITION		c11
#define C_LIGHT_ATTEN			c12
#define C_HALF					c13


;------------------------------------------------------------------------------
; Diffuse color
;------------------------------------------------------------------------------

; Calculate normalized light vector
add		rVertexToLight, C_LIGHT_POSITION, -pPos
NormalizeVector(rVertexToLight)

; Calculate attenuation factor
dst		rTemp, rTemp.wwww, rVertexToLight.wwww
dp3		rTemp.w, rTemp, C_LIGHT_ATTEN
rcp		rAtten.w, rTemp.w

; Calculate normalized eye vector
add		rVertexToEye, C_EYE_POSITION, -pPos
NormalizeVector(rVertexToEye)

; Calculate normalized half vector
add		rHalfVector, rVertexToEye, rVertexToLight
NormalizeVector(rHalfVector)

; Calculate self-shadowing term
dp3		rTemp, pNormal, rHalfVector
sge		rTemp, rTemp, C_ZERO

; Store attenuated material color in diffuse channel
mov		oD0.xyz, C_MATERIAL_COLOR
mul		oD0.w, rAtten.w, rTemp.w

; Transform H vector into texture space and store in the specular channel
dp3		rTemp.x, rHalfVector, pBasisU
dp3		rTemp.y, rHalfVector, pBasisV
dp3		rTemp.z, rHalfVector, pNormal
mad		oD1.xyz, rTemp, C_HALF, C_HALF

#ifdef _PCBUILD
mov		oD1.w, C_ONE
#endif