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# Objective - Fixes #20008 - Preconvert colors before sending them to the UI gradients shader for better performance ## Solution - Modified `prepare_gradient` in `gradient.rs` to convert colors from `LinearRgba` to `Srgba` on the CPU before sending to the GPU - Updated the gradient shader to remove per-pixel color space conversions since colors are now pre-converted - Added documentation to clarify that vertex colors are in sRGB space This optimization reduces the number of power operations per pixel from 3 to 1: - **Before**: Convert start color to sRGB, convert end color to sRGB, mix, convert back to linear (3 pow operations per pixel) - **After**: Colors pre-converted on CPU, mix in sRGB space, convert back to linear (1 pow operation per pixel) ## Testing - Verified that the UI gradient examples (`cargo run --example gradients`) compile and render correctly - The visual output should remain identical while performance improves, especially for large gradient areas - Changes maintain the same color interpolation behavior (mixing in sRGB space) To test: 1. Run `cargo run --example gradients` or `cargo run --example stacked_gradients` 2. Verify gradients render correctly --------- Co-authored-by: ickshonpe <david.curthoys@googlemail.com> |
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Bevy Render UI
