vs_2_0
dcl_position	v0
dcl_normal		v1
dcl_texcoord0	v3
#include "..\..\VertexShader.h"

;------------------------------------------------------------------------------
; Geometry transform
;------------------------------------------------------------------------------

; Copy model-space geometry to pipeline registers
mov		pPos, vPos
mov		pNormal, vNormal

; Transform position to projection space
m4x4	OPOS, vPos, C_PROJECTION_MATRIX
FIXUP_OPOS
#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
sub     rLightCoeff.x, C_ONE, rLightCoeff.x

; Square the coefficient to emphasize the effect (needed?)
mul     rLightCoeff.x, rLightCoeff.x, rLightCoeff.x

; Modulate with constant diffuse alpha
mov     oD0.rgb, C_MATERIAL_COLOR
mul		oD0.a, rLightCoeff.x, C_MATERIAL_COLOR
#include "..\..\VertexShader.h"

;------------------------------------------------------------------------------
; Fog calculation
;------------------------------------------------------------------------------
#include "..\..\VertexShader.h"

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

; Scale and offset the base texture coordinates
mov		r0, c12
mul		r0, r0, C_TEXCOORD_DECOMPRESS
mad		oT0, vTexCoords, r0, c13