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Spped up SSAO

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Avoid using cos/sin too much, use sum of cos/sin formula instead.
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vlj 2014-06-03 03:14:39 +02:00
parent 783464ee81
commit 164ffa2b4f
1 changed files with 6 additions and 2 deletions
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data/shaders/ssao.frag
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@ -59,11 +59,15 @@ void main(void)
float phi = 30. * (x ^ y) + 10. * x * y;
float bl = 0.0;
float theta = 2. * 3.14 * tau * .5 * invSamples + phi;
vec2 rotations = vec2(cos(theta), sin(theta)) * screen;
vec2 offset = vec2(cos(invSamples), sin(invSamples));
for(int i = 0; i < SAMPLES; ++i) {
float alpha = (i + .5) * invSamples;
float theta = 2. * 3.14 * tau * alpha + phi;
rotations = vec2(rotations.x * offset.x - rotations.y * offset.y, rotations.x * offset.y + rotations.y * offset.x);
float h = r * alpha;
vec2 offset = h * vec2(cos(theta), sin(theta)) * screen;
vec2 offset = h * rotations;
float m = round(log2(h) + 6);
ivec2 ioccluder_uv = ivec2(x, y) + ivec2(offset);