0xrsydn
a20d3310db
Adds --check (compile every effect without camera or window), EFFECTS.md (the contract for writing effects) and AGENTS.md. The POC stays available at the 'poc' tag. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
20 lines
897 B
Metal
20 lines
897 B
Metal
// Whatever moves lights up and the glow lingers. The heat is carried from frame to frame
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// in the alpha channel of this effect's own previous output.
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// order 50
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// slider sensitivity 1.0 30.0 10.0
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// slider linger 0.5 0.99 0.93
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// slider dim 0.0 1.0 0.45
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// slider hue 0.0 1.0 0.07
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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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float4 effect(float2 uv, Inputs in) {
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float moved = length(in.camera.sample(in.smp, uv).rgb - in.last.sample(in.smp, uv).rgb);
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float fresh = smoothstep(0.3, 1.0, moved * in.p.sensitivity);
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float heat = max(in.prev.sample(in.smp, uv).a * in.p.linger, fresh);
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float3 glow = hueColor(in.p.hue);
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return float4(in.image.sample(in.smp, uv).rgb * in.p.dim + glow * heat, heat);
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}
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