;/**************************************************
; * File:        Transform.txt Vertex Shader
; *
; * Author:      Ben Cohen (01/06/2001)
; *				 modified by Ben Weston to compute the correct fog value for table fog
; *
; * Description: Standard transformation vertex shader
; *
; *************************************************/
;/*************************************************
; * Constants:
; *
; * c0     - constants vector {0,1.0,0.5,0.25}
; * c2-c5  - World->screen transformation matrix.
; *
; * Streams:
; * v0     - Position vector {x,y,z,w}
; * v1     - Vertex colour
; * v2     - Texture co-ords {u,v}
; *
; ************************************************/
xvs.1.0

#pragma screenspace

#define R_EYE_POSITION	r0
#define R_EYE_DISTANCE	r2

#include "Shader_def.h"

/* Fog calculation */
//BenW..dp4 R_EYE_POSITION.x, v0, c[CV_WORLDVIEW_0]
//BenW..dp4 R_EYE_POSITION.y, v0, c[CV_WORLDVIEW_1]
//BenW..dp4 R_EYE_DISTANCE.z, v0, c[CV_WORLDVIEW_2]
//BenW..dp4 R_EYE_POSITION.w, v0, c[CV_WORLDVIEW_3]

; transform position
dp4 oPos.x, v0, c[CV_WORLDVIEWPROJ_0]
//BenW..dp3 R_EYE_DISTANCE, R_EYE_POSITION, R_EYE_POSITION
dp4 oPos.y, v0, c[CV_WORLDVIEWPROJ_1]
//BenW..rsq R_EYE_DISTANCE, R_EYE_DISTANCE
dp4 oPos.z, v0, c[CV_WORLDVIEWPROJ_2]
//BenW..rcp R_EYE_DISTANCE, R_EYE_DISTANCE
dp4 oPos.w, v0, c[CV_WORLDVIEWPROJ_3]

; Copy vertex colour
mov oD0, v1

; Copy texture co-ords across
;mov oT0, v2
add oT0, v2, c[CV_TEXTURETRANS_20]

mul oPos.xyz, r12, c-38
+rcc r1.x, r12.w

/* Fog */
//BenW..mad oFog.x, -R_EYE_DISTANCE.y, c[CV_FOG_DATA].z, c[CV_FOG_DATA].y
dp4 oFog.x, v0, c[CV_WORLDVIEW_2]

mad oPos.xyz, r12, r1.x, c-37

;/***************/
;/* END OF FILE */
;/***************/