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G1: preserve GPU Posterize threshold parity

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Use an explicit FMA for the final quotient correction at Posterize
boundaries. Align the kinetic motion-blur QA comparison with export
settings and credit sanyamsingh001.

Co-authored-by: Codex <codex@openai.com>
This commit is contained in:
sanyamsingh001
2026-10-09 23:03:05 +10:00
co-authored by Codex
parent cae67546dd
commit 6d99f68330
3 changed files with 7 additions and 1 deletions
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crates/gpu/src/shaders/fx_stylize.wgsl
+1 -1
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@@ -40,7 +40,7 @@ fn fxs_smoothstep(e0: f32, e1: f32, x: f32) -> f32 {
fn fxs_qdiv(x: vec3<f32>, a: f32) -> vec3<f32> {
let q = x / a;
let r = fma(-q, vec3<f32>(a), x);
return q + r / a;
return fma(r / a, vec3<f32>(1.0), q);
}
fn fxs_rem2(i: i32) -> i32 {