ch24p3_blur.ps

游戏开发特殊技巧-special.effects.game.programming

// this pixel shader renders a blurred image.

ps.1.1

def c1, 0.25f, 0.25f, 0.25f, 0.25f

tex t0 
tex t1
tex t2
tex t3

mul r0, c1, t0
mad r0, c1, t1, r0
mad r0, c1, t2, r0
mad r0, c1, t3, r0