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Simplify hammersley function with reverseBits

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Máté Homolya 2025-07-17 00:31:51 -07:00
parent 884ab40049
commit 9c56874b24
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1 changed files with 3 additions and 9 deletions
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crates/bevy_pbr/src/light_probe/environment_filter.wgsl
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@ -94,15 +94,9 @@ fn sample_environment(dir: vec3f, level: f32) -> vec4f {
// Hammersley sequence for quasi-random points
fn hammersley_2d(i: u32, n: u32) -> vec2f {
// Van der Corput sequence
var bits = i;
bits = (bits << 16u) | (bits >> 16u);
bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
let vdc = f32(bits) * 2.3283064365386963e-10; // 1 / 0x100000000
return vec2f(f32(i) / f32(n), vdc);
let inv_n = 1.0 / f32(n);
let vdc = f32(reverseBits(i)) * 2.3283064365386963e-10; // 1/2^32
return vec2f(f32(i) * inv_n, vdc);
}
// Blue noise randomization