ch24p3_teapot.vs

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

vs.1.0

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

// compute world space position
dp4 r1.x, v1, c[11]
dp4 r1.y, v1, c[12]
dp4 r1.z, v1, c[13]
dp4 r1.w, v1, c[14]

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

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

dp3 r3, v0, r2
mul oD0, r3, c[5]

mov oT0.xy, v3