cb49b032df
Squashed from work; the fine-grained history is under tag archive/work-2026-08-26: - vjfx: 104 new presets — the transition lane fills out and the screen family goes wide - vjfx: three lanes land — engine hooks + hold stage, the videomesh engine, and the audio picture - vj: the thumbnail pipeline becomes one honest machine, and effects go livecodable - vj: thumbnails become mp4 — hardware-coded sheets at measured-4K cells, and the bake stops racing the GPU - store: the ceremony dies — batch publish, one transaction, and the engine stops re-reading its own log - store: the ceremony dies — batch publish, one transaction, and the engine stops re-reading its own log - vj: the console grows real transports, and the deck stops lying about reverse - vj: reverse earns a memory, and the effects stop aging - fab: a 3D creation shell and the viewer built on it
30 lines
1.2 KiB
Text
30 lines
1.2 KiB
Text
// ALPHA LAYER — deck B composites over deck A using B's OWN ALPHA
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// channel as the per-pixel key, like laying a clip with real transparency
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// on top of the program instead of a flat crossfade. OPACITY scales the
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// whole layer, GAMMA bends B's alpha curve before it gates, PREMULT
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// un-premultiplies B's colour by its own alpha first (off by default).
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{
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name: "Alpha Layer"
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engine: "transition"
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engage: "ramp"
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p0: 1.0 p1: 0.5
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dials: [
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{name: "OPACITY", bind: "p0", default: 1.0},
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{name: "GAMMA", bind: "p1", default: 0.5},
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{name: "PREMULT", bind: "p2", default: 0.0}
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]
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shader: draw.DrawVjFxDuo {
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trans: fn(uv: vec2, t: float) -> vec4 {
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let a = self.deck_a(uv)
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let b = self.deck_b(uv)
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let curve = pow(4.0, self.user.y * 2.0 - 1.0)
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let ba = pow(clamp(b.w, 0.0, 1.0), curve)
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let opacity = self.user.x * clamp(t, 0.0, 1.0)
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let k = ba * opacity
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let unmult = b.xyz / max(b.w, 0.05)
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let bc = b.xyz.mix(unmult, step(0.5, self.user.z))
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let composite = a.xyz.mix(bc, k)
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return vec4(composite.x, composite.y, composite.z, 1.0)
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}
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}
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}
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