/**************************************************
 * File:        TandL.txt Vertex Shader
 *
 * Author:      Ben Cohen (02/11/2000)
 *
 * Description: Standard transformation and
 *              lighting vertex shader
 *
 *************************************************/
/*************************************************
 * Constants:
 *
 * c0     - constants vector {0,1.0,0.5,256}
 * c1     - screen offsets {0.53125, 0.53125, 0.03125, 0.0}
 * c2-c5  - World->screen transformation matrix.
 * c6     - Light direction
 * c7     - Directional light colour
 * c8     - Ambient light Colour
 *
 * Streams:
 * v0     - Position vector {x,y,z,w}
 * v1     - Normal {x,y,z,w}
 * v2     - S Basis vector
 * v3     - T Basis vector
 * v4     - colour
 * v5     - Texture co-ords {u,v}
 *
 ************************************************/

xvs.1.0
#define S_VECTOR	v2
#define T_VECTOR	v3
#define SxT_VECTOR	v4

#define LIGHT_LOCAL	r3

#include "Shader_def.h"

/* Transform position */
dp4 oPos.x, v0, c[CV_WORLDVIEWPROJ_0]
dp4 oPos.y, v0, c[CV_WORLDVIEWPROJ_1]
dp4 oPos.z, v0, c[CV_WORLDVIEWPROJ_2]
dp4 oPos.w, v0, c[CV_WORLDVIEWPROJ_3]


; transform light by basis vectors to put it
; into texture space
dp3 LIGHT_LOCAL.x, S_VECTOR.xyz, c[CV_LIGHT_START + 1] ; quick hack
dp3 LIGHT_LOCAL.y, T_VECTOR.xyz, c[CV_LIGHT_START + 1] ; quick hack
dp3 LIGHT_LOCAL.z, SxT_VECTOR.xyz, c[CV_LIGHT_START + 1] ; quick hack

; Normalize the light vector
dp3 LIGHT_LOCAL.w, LIGHT_LOCAL, LIGHT_LOCAL
rsq LIGHT_LOCAL.w, LIGHT_LOCAL.w
mul LIGHT_LOCAL, LIGHT_LOCAL, LIGHT_LOCAL.w

add LIGHT_LOCAL, LIGHT_LOCAL, c[CV_CONSTANT].y
mul LIGHT_LOCAL, LIGHT_LOCAL, c[CV_CONSTANT].z

mul LIGHT_LOCAL, LIGHT_LOCAL, c[CV_LIGHT_START]
add oD0, LIGHT_LOCAL, c[CV_AMBLIGHT_COLOUR]

; Set alpha to 1
mov oD0.w, c[CV_CONSTANT].y

/* Copy texture coordinates across */
mov oT0, v6
mov oT1, v6

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