forked from 1b-agent/opencadstudio-upstream
14 lines
811 B
WebGPU Shading Language
14 lines
811 B
WebGPU Shading Language
// Positive order draws in front; zero retains geometric depth. Keep the usual
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// 0.001 NDC offset away from the clipping planes, but reduce it near either
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// plane: perspective depth can be much closer to 1 than this fixed offset.
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//
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// Using order / (1 + abs(order)) for the limited region keeps ordering monotonic
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// (including the paper background's -2). Less than half the remaining depth is
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// consumed, so valid vertices stay valid. Out-of-range/behind-eye vertices get
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// no offset and remain subject to the real near/far clipping planes.
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fn apply_draw_order(clip: vec4<f32>, order: f32) -> vec4<f32> {
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let room = 0.5 * max(0.0, min(clip.z, clip.w - clip.z));
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let scale = min(0.001 * max(clip.w, 0.0), room / (1.0 + abs(order)));
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return vec4<f32>(clip.xy, clip.z - order * scale, clip.w);
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}
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