blur.nvv

游戏编程精华02－含有几十个游戏编程例子

/************************************************************************
Blur.nvv

This file implementes a simple vertex-shader to blur textures.  It 
first transforms the vertex position to clip-space and then replicates
texture coordinates to all four stages from v1 while adding an offset 
from constant memory.  The texture coordinate-offsets to use are selected 
with the "Offset" constant from constant memory.  Texture 
coordinate-offsets are either set-up to be zero (no offset) or to enable 
blur-filtering.

Copyright (C) 1999, 2000 NVIDIA Corporation
*************************************************************************/

#include "Constants.h"

vs.1.1

; Transform vertex position to clip space
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]

mov a0.x, c[CV_UV_OFFSET_TO_USE].x

add oT0, v1, c[a0.x + CV_T0_BASE]
add oT1, v1, c[a0.x + CV_T1_BASE]
add oT2, v1, c[a0.x + CV_T2_BASE]
add oT3, v1, c[a0.x + CV_T3_BASE]