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

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

#define C_EYE_POSITION			c10


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

; Compute the normalized vertex to eye vector
add		rVertexToEye, C_EYE_POSITION, -pPos
NormalizeVector(rVertexToEye)

; Dot with vertex normal and take absolute value
dp3		rLightCoeff.x, pNormal, rVertexToEye
max		rLightCoeff.x, rLightCoeff.x, -rLightCoeff.x
max		rLightCoeff.x, rLightCoeff.x, C_ZERO.x

; Modulate with constant diffuse alpha
mov     oD0.rgb, C_MATERIAL_COLOR
mul		oD0.a, rLightCoeff.x, C_MATERIAL_COLOR