world.nvp

游戏编程精华02－含有几十个游戏编程例子

/************************************************************************
World.nvp

Use texture coordinates to look up the circle-of-confusion interpolator
and store it in dest-alpha.  Output color is simply tex0 color.

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

ps.1.1

def c0, 1.0f, 0.0f, 0.0f, 0.0f

tex t0      ; get color from first texture stage
tex t1      ; t1 holds the circle-of-confusion interpolator look-up

; select the r (x) component, replicate it across all channels, and 
; store the proper circle-of-confusion interpolator in dest alpha!
dp3_sat r0.rgba, t1, c0

; and use texture 0 as current color
mov_sat r0.rgb, t0