0xrsydn
6591138bbf
Snapshot before the Python POC is removed. The POC (main.py, effects.py, panel.py, shaders.py, effects/*.glsl, flake.nix) is the reference for the native app under native/. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
38 lines
1.5 KiB
Metal
38 lines
1.5 KiB
Metal
// Glowing outlines with a slowly cycling colour.
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// order 20
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// slider detail 1.0 12.0 5.0
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// slider glow 0.0 6.0 2.5
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// slider source 0.0 1.0 0.35
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// slider hue 0.0 1.0 0.55
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// slider cycle 0.0 1.0 0.3
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// hue 0..1 -> a fully saturated colour (0 red, 0.08 orange, 0.33 green, 0.66 blue)
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static float3 hueColor(float h) {
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return clamp(abs(fract(h + float3(0.0, 2.0 / 3.0, 1.0 / 3.0)) * 6.0 - 3.0) - 1.0, 0.0, 1.0);
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}
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static float luma(Inputs in, float2 uv) {
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return dot(in.image.sample(in.smp, uv).rgb, float3(0.299, 0.587, 0.114));
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}
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// how strongly brightness changes around this point
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static float edge(Inputs in, float2 uv) {
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float2 t = 1.5 / in.resolution;
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float dx = luma(in, uv + float2(t.x, 0.0)) - luma(in, uv - float2(t.x, 0.0));
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float dy = luma(in, uv + float2(0.0, t.y)) - luma(in, uv - float2(0.0, t.y));
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return length(float2(dx, dy));
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}
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float4 effect(float2 uv, Inputs in) {
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float sharp = smoothstep(0.1, 0.5, edge(in, uv) * in.p.detail);
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float halo = 0.0; // edges found in a ring around this pixel = a cheap glow
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for (int i = 0; i < 12; i++) {
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float a = 6.2832 * float(i) / 12.0;
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float2 dir = float2(cos(a), sin(a)) / in.resolution;
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halo += edge(in, uv + dir * 4.0) + edge(in, uv + dir * 9.0);
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}
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halo = halo / 24.0 * in.p.detail * in.p.glow;
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float3 tint = hueColor(in.p.hue + in.time * in.p.cycle * 0.2);
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float3 base = in.image.sample(in.smp, uv).rgb * in.p.source;
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return float4(base + tint * (sharp + halo), 1.0);
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}
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