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>
16 lines
741 B
Metal
16 lines
741 B
Metal
// Feedback trails: the previous output is zoomed, turned and faded, so bright things leave streaks.
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// "push" smears the trails in the direction things are moving.
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// order 40
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// on
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// slider fade 0.5 0.995 0.92
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// slider zoom -0.04 0.04 0.012
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// slider spin -0.05 0.05 0.005
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// slider push 0.0 4.0 0.0
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float4 effect(float2 uv, Inputs in) {
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float2 c = uv - 0.5;
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float2 turned = float2(c.x * cos(in.p.spin) - c.y * sin(in.p.spin), c.x * sin(in.p.spin) + c.y * cos(in.p.spin));
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float2 from = turned * (1.0 - in.p.zoom) + 0.5 - in.flow.sample(in.smp, uv).xy * in.p.push;
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float3 trail = in.prev.sample(in.smp, from).rgb * in.p.fade;
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float3 live = in.image.sample(in.smp, uv).rgb;
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return float4(max(live, trail), 1.0);
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}
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