d8d5ea8b6a
Restore missing required asset/flow packages from the pinned nigig revision; retain upstream script isolation, X11 hover, and widget-core fixes. Validated makepad-widgets data feature with Rust 1.97.1.
49 lines
1.8 KiB
Text
49 lines
1.8 KiB
Text
// CHROMA KEY — green-screen over the program: deck B replaces deck A
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// wherever B is NEAR THE KEY COLOR… inverted logic from the luma key:
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// the KEYED color becomes transparent, the rest of B rides over A. HUE
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// picks the key color (0 = green, sweep for blue), TOL the tolerance,
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// SOFT the matte edge. Ridden like every MX50 mode: the fader holds it.
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{
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name: "Chroma Key"
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engine: "transition"
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// Overlay semantics: ridden to the fader's end the key STAYS fully
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// applied (the composite is the destination) — never a snap to
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// plain B. Zero only at the A end.
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engage: "ramp"
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dials: [
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{name: "HUE", bind: "p0", default: 0.33},
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{name: "TOL", bind: "p1", default: 0.35},
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{name: "SOFT", bind: "p2", default: 0.2}
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]
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shader: draw.DrawVjFxDuo {
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hue_of: fn(c: vec3) -> float {
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let hi = max(c.x, max(c.y, c.z))
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let lo = min(c.x, min(c.y, c.z))
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let d = hi - lo
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if d < 0.0001 {
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return 0.0
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}
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let mut h = 0.0
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if hi == c.x {
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h = modf((c.y - c.z) / d + 6.0, 6.0)
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} else if hi == c.y {
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h = (c.z - c.x) / d + 2.0
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} else {
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h = (c.x - c.y) / d + 4.0
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}
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return h / 6.0
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}
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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 h = self.hue_of(b.xyz)
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let d0 = abs(h - self.user.x)
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let dist = min(d0, 1.0 - d0)
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let tol = 0.02 + self.user.y * 0.2
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let soft = 0.005 + self.user.z * 0.1
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// Inside the tolerance = the matte (transparent); outside = B.
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let matte = smoothstep(tol - soft, tol + soft, dist)
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return a.mix(b, matte * t)
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}
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}
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}
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