ch24p3_imgmanip.vs

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

vs.1.0

// transform position
m4x4 oPos, v0, c[0]

// normalize normal
dp3 r0.w, r0, r0
rsq r0.w, r0.w
mul r0, r0, r0.w

// compute world space position
dp4 r1.x, v0, c[11]
dp4 r1.y, v0, c[12]
dp4 r1.z, v0, c[13]
dp4 r1.w, v0, c[14]

// vector from point to eye
add r2, c[10], -r1
//mov r2, -r1

// normalize e
dp3 r2.w, r2, r2
rsq r2.w, r2.w
mul r2, r2, r2.w

mov oT0.xy, r2