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Blend gradient backgrounds linearly; two colours over twice the view

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Measured against the reference: a two-colour gradient reaches its end
colours a viewport beyond the edges, and the bands blend linearly.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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ramox81andClaude Opus 5.5 committed 2026-10-12 11:51:39 +03:00
1 parent 46daf03bc9
commit bd4029fb50
1 file changed
+6 -4
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src/shaders/background.wgsl
+6 -4
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@@ -120,11 +120,13 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
let horizon = clamp(u.background_params.y, 0.0, 1.0);
let half_height = abs(u.background_params.z) * 0.5;
if half_height <= 1e-6 {
// Two colours: one blend from the bottom to the top.
color = mix(u.background_bottom.rgb, u.background_top.rgb, coordinate);
// Two colours: one blend from the bottom to the top, over twice
// the viewport (the reference's two-colour gradient reaches the
// end colours a viewport beyond the edges).
color = mix(u.background_bottom.rgb, u.background_top.rgb, 0.25 + 0.5 * coordinate);
} else {
let lower = smoothstep(horizon - half_height, horizon, coordinate);
let upper = smoothstep(horizon, horizon + half_height, coordinate);
let lower = clamp((coordinate - (horizon - half_height)) / half_height, 0.0, 1.0);
let upper = clamp((coordinate - horizon) / half_height, 0.0, 1.0);
let low_color = mix(u.background_bottom.rgb, u.background_middle.rgb, lower);
color = mix(low_color, u.background_top.rgb, upper);
}