vs_2_0
dcl_position	v0
dcl_color		v2
dcl_texcoord0	v3
dcl_texcoord5	v13
#include "VertexShader.h"

#define C_BILLBOARD_X c10
#define C_BILLBOARD_Y c14
#define C_ASPECT c15

;------------------------------------------------------------------------------
; Vertex transformation
;------------------------------------------------------------------------------

; Transform to projection space
m4x4	r0, vPos, C_PROJECTION_MATRIX

; Adjust for aspect ratio
mul     r4, vScale, C_ASPECT
; Add in the appropriate billboard vectors
; (These are already transformed into projection space)

mad     r0, r4.x, C_BILLBOARD_X, r0
mad     OPOS, r4.y, C_BILLBOARD_Y, r0
FIXUP_OPOS

;------------------------------------------------------------------------------
; Lighting calculation
;------------------------------------------------------------------------------

; Combine vertex color and material color
mul		oD0, vDiffuse, C_MATERIAL_COLOR

; Calculate fog factor
CalculateLayeredFog(vPos, oFog)


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

; Copy base tex coords
mov		oT0.xy, vTexCoords