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

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

#define C_LIGHT_POSITION		c10
#define C_INVERSE_RADIUS		c11
#define C_HALF					c12


;------------------------------------------------------------------------------
; Texture coordinates
;------------------------------------------------------------------------------

; Calculate the vertex-to-light vector
add		rVertexToLight, C_LIGHT_POSITION, -pPos

; For light attenuation, store scaled and biased vertex-to-light vector in texture stages
mul		rTemp, rVertexToLight, C_INVERSE_RADIUS
mad		oT0.xy, rTemp.xy, C_HALF, C_HALF
mad		oT1.x, rTemp.z, C_HALF, C_HALF
mov		oT1.y, C_HALF

; Transform L vector into texture space and store as a texture stage
dp3		oT2.x, rVertexToLight, pBasisU
dp3		oT2.y, rVertexToLight, pBasisV
dp3		oT2.z, rVertexToLight, pNormal

; Last texture stage is the normal map
mul		oT3.xy, vTexCoords, C_TEXCOORD_DECOMPRESS