dirlight.nvv

游戏编程精华02－含有几十个游戏编程例子

; Transforms a vertex to homogenoeous clip space
; and lights it with a single directional light in
; world space, then outputs a texture coordinate.
; - 7 instructions
; Note that negative output colors will be clamped
; by the implicit 0-1 clamp after the shader

#include "constants.h"

#define srcPosition v0
#define srcNormal	v1
#define srcTexCoord	v2

#define destTexCoord oT0

	vs.1.0


;transform position
	dp4 oPos.x, srcPosition, c[CV_WORLDVIEWPROJ_0]
	dp4 oPos.y, srcPosition, c[CV_WORLDVIEWPROJ_1]
	dp4 oPos.z, srcPosition, c[CV_WORLDVIEWPROJ_2]
	dp4 oPos.w, srcPosition, c[CV_WORLDVIEWPROJ_3]


	// get directional lighting at vertex
	dp3	r0, srcNormal, c[CVP_LIGHT_DIRECTION]
	mul	oD0, r0, c[CV_MATERIAL_COLOR]

; Output texture coordinates
	mov destTexCoord, srcTexCoord