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SSAO: Improve the initial sampling values.

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This commit is contained in:
Vincent Lejeune 2014-01-25 21:43:12 +01:00
parent 724aed6609
commit e6c419e695
1 changed files with 12 additions and 3 deletions
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15
src/graphics/shaders.cpp
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@ -1159,17 +1159,26 @@ namespace FullScreenShader
vao = createVAO(Program);
for (unsigned i = 0; i < 16; i++) {
// Generate x/y component between -1 and 1
// Use double to avoid denorm and get a true uniform distribution
// Generate z component between [0.1; 1] to avoid being too close from surface
double z = rand();
z /= RAND_MAX;
z = 0.1 + 0.9 * z;
// Now generate x,y on the unit circle
double x = rand();
x /= RAND_MAX;
x = 2 * x - 1;
double y = rand();
y /= RAND_MAX;
y = 2 * y - 1;
double xynorm = sqrt(x * x + y * y);
x /= xynorm;
y /= xynorm;
// Now resize x,y so that norm(x,y,z) is one
x *= sqrt(1. - z * z);
y *= sqrt(1. - z * z);
// compute z so that norm (x,y,z) is one
double z = sqrt(x * x + y * y);
// Norm factor
double w = rand();
w /= RAND_MAX;