tolelom
6c938999e4
- Add hdr.rs with HdrTarget (Rgba16Float render target) and HDR_FORMAT constant - Add bloom.rs with BloomResources (5-level mip chain), BloomUniform, and mip_sizes() - Add tonemap.rs with TonemapUniform and CPU-side aces_tonemap() for testing - Export all new types from lib.rs - 33 tests passing (26 existing + 3 bloom + 4 tonemap) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
72 lines
2.0 KiB
Rust
72 lines
2.0 KiB
Rust
use bytemuck::{Pod, Zeroable};
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/// Uniform buffer for the tonemap pass.
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#[repr(C)]
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#[derive(Copy, Clone, Debug, Pod, Zeroable)]
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pub struct TonemapUniform {
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/// Bloom contribution weight.
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pub bloom_intensity: f32,
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/// Pre-tonemap exposure multiplier.
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pub exposure: f32,
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pub _padding: [f32; 2],
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}
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impl Default for TonemapUniform {
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fn default() -> Self {
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Self {
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bloom_intensity: 0.5,
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exposure: 1.0,
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_padding: [0.0; 2],
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}
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}
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}
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/// CPU implementation of the ACES filmic tonemap curve (for testing / CPU-side work).
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///
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/// Formula: clamp((x*(2.51*x+0.03))/(x*(2.43*x+0.59)+0.14), 0, 1)
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pub fn aces_tonemap(x: f32) -> f32 {
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let num = x * (2.51 * x + 0.03);
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let den = x * (2.43 * x + 0.59) + 0.14;
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(num / den).clamp(0.0, 1.0)
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}
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// ── Tests ─────────────────────────────────────────────────────────────────────
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn aces_zero() {
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// aces(0) should be ≈ 0
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assert!(aces_tonemap(0.0).abs() < 1e-5, "aces(0) = {}", aces_tonemap(0.0));
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}
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#[test]
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fn aces_one() {
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// aces(1) ≈ 0.80 with the standard formula
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// clamp((1*(2.51+0.03))/(1*(2.43+0.59)+0.14), 0, 1) = 2.54/3.16 ≈ 0.8038
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let v = aces_tonemap(1.0);
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assert!(
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(v - 0.8038).abs() < 0.001,
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"aces(1) = {}, expected ≈ 0.8038",
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v
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);
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}
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#[test]
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fn aces_large() {
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// aces(10) should be very close to 1.0 (saturated)
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let v = aces_tonemap(10.0);
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assert!(v > 0.999, "aces(10) = {}, expected ≈ 1.0", v);
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}
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#[test]
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fn tonemap_uniform_default() {
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let u = TonemapUniform::default();
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assert!((u.bloom_intensity - 0.5).abs() < f32::EPSILON);
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assert!((u.exposure - 1.0).abs() < f32::EPSILON);
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assert_eq!(u._padding, [0.0f32; 2]);
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}
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}
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