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Use proper wrapping arithmetic in the golden ratio sampler.

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Nathan Vegdahl 2020-03-15 18:10:03 +09:00
parent ffc77ee1d5
commit 42a6c1e9cd
1 changed files with 1 additions and 1 deletions
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src/renderer.rs
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@ -701,7 +701,7 @@ fn get_sample(dimension: u32, i: u32, pixel_co: (u32, u32), seed: u32) -> f32 {
// being crazily more efficient than pretty much any other sampler, // being crazily more efficient than pretty much any other sampler,
// and reduces variance by a huge amount. // and reduces variance by a huge amount.
let scramble = hash_u32(pixel_id, seed); let scramble = hash_u32(pixel_id, seed);
let n = (i + scramble) * 2654435769; let n = i.wrapping_add(scramble).wrapping_mul(2654435769);
n as f32 * (1.0 / (1u64 << 32) as f32) n as f32 * (1.0 / (1u64 << 32) as f32)
} }
n if (n - 1) < sobol::NUM_DIMENSIONS as u32 => { n if (n - 1) < sobol::NUM_DIMENSIONS as u32 => {