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+ | Better random

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TheRedShip
2025-01-04 18:14:24 +01:00
parent 05387337cf
commit 8f256e5c35
8 changed files with 83 additions and 28 deletions
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29
shaders/random.glsl
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@ -42,3 +42,32 @@ vec3 randomVec3(vec2 uv, float time)
{
return (vec3((random(uv, time) - 0.5) * 2, (random(uv, time) - 0.5) * 2, (random(uv, time) - 0.5) * 2));
}
float randomValue(inout uint rng_state)
{
rng_state = rng_state * 747796405 + 2891336453;
uint result = ((rng_state >> ((rng_state >> 28) + 4)) ^ rng_state) * 277803737;
result = (result >> 22) ^ result;
return (result / 4294967295.0);
}
float randomValueNormalDistribution(inout uint rng_state)
{
float theta = 2.0 * 3.14159265359 * randomValue(rng_state);
float rho = sqrt(-2.0 * log(randomValue(rng_state)));
return (rho * cos(theta));
}
vec3 randomDirection(inout uint rng_state)
{
float x = randomValueNormalDistribution(rng_state);
float y = randomValueNormalDistribution(rng_state);
float z = randomValueNormalDistribution(rng_state);
return normalize(vec3(x, y, z));
}
vec3 randomHemisphereDirection(vec3 normal, inout uint rng_state)
{
vec3 direction = randomDirection(rng_state);
return (direction * sign(dot(normal, direction)));
}