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.
91 lines
4.3 KiB
Text
91 lines
4.3 KiB
Text
// SCAN SERMON — the pure-document effect: NO engine geometry at all, the
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// whole frame is the fragment function in this file.
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//
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// This is the pattern to copy when an author wants a look no engine has:
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// pick `engine: "screen"`, declare a `shader: draw.DrawVjFxScreen` block,
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// and write `fx_color(uv, content, cmix)`. The engine contributes nothing
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// but the quad and the clock — every pixel below is doc-authored. The
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// stage chain still runs on top, so bloom/feedback/warps compose with it.
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//
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// The look: a broadcast scan head sweeping down the frame, tearing the
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// video into bands that lag behind it, with the beat driving the tear and
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// a phosphor rgb-split on the leading edge.
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{
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name: "Scan Sermon"
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engine: "screen"
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seed: 5
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input0: "test"
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speed: 1.0
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beat_pulse: 0.6
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beat_rate: 1.0
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bar_beats: 4
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glow: 1.0
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// PERFORMANCE DIALS — each default reproduces the stock look exactly
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// (mid-knob multipliers are 1.0 at 0.5).
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p0: 0.5 p1: 0.5 p2: 0.5
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dials: [
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{name: "TEAR", bind: "p0", default: 0.5},
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{name: "BANDS", bind: "p1", default: 0.5},
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{name: "SPLIT", bind: "p2", default: 0.5}
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]
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color_bg: #x03040a
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color_a: #x30ffd0
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color_b: #xff3a86
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color_c: #xfff0d0
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stages: [
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{kind: "bloom", threshold: 0.55, strength: 1.15, levels: 3}
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]
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// THE LOOK LIVES HERE. There is no engine shading under this at all:
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// whatever this function returns IS the frame.
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// Inputs: uv = screen uv (0,0 top-left), content = input0 at uv,
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// cmix = the pre-gated content strength (0 without real channel video,
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// so a look can tell the fallback pattern from a live clip).
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// Signals: self.time_beat (time, beat, phase, pulse),
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// self.sig (bar, bpm, energy, dt), self.user (p0..p3),
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// self.col_a/b/c/bg, self.fog (density, glow, content, -).
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shader: draw.DrawVjFxScreen {
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fx_color: fn(uv: vec2, content: vec4, cmix: float) -> vec4 {
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// The scan head: one sweep per bar, wrapping.
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let head = fract(self.sig.x)
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// Horizontal bands; more of them as BANDS opens.
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let bands = 6.0 + 26.0 * clamp(self.user.y, 0.0, 1.0)
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let band = floor(uv.y * bands)
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let band01 = fract(uv.y * bands)
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// Distance BELOW the head, wrapped: a band the head just
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// crossed is hot and displaced, and it settles as it ages.
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let age = fract(uv.y - head + 1.0)
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let hot = pow(1.0 - age, 9.0)
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// Tear: each band slides by its own hash, hardest right after
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// the head passes and on the beat pulse.
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let hash = fract(sin(band * 12.9898 + 3.0) * 43758.5453)
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let drive = (0.30 + 1.7 * clamp(self.user.x, 0.0, 1.0))
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* (0.25 + self.time_beat.w)
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let slide = (hash - 0.5) * hot * drive * 0.35
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let suv = clamp(vec2(fract(uv.x + slide), uv.y), vec2(0.0, 0.0), vec2(1.0, 1.0))
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// Phosphor split: the channels separate along the tear.
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let sp = (0.002 + 0.03 * clamp(self.user.z, 0.0, 1.0)) * (0.2 + hot)
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let r = self.tex0.sample_as_bgra(clamp(suv + vec2(sp, 0.0), vec2(0.0, 0.0), vec2(1.0, 1.0)))
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let g = self.tex0.sample_as_bgra(suv)
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let b = self.tex0.sample_as_bgra(clamp(suv - vec2(sp, 0.0), vec2(0.0, 0.0), vec2(1.0, 1.0)))
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let mut rgb = vec3(r.x, g.y, b.z)
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// Scanline gate inside each band + a dark seam between bands.
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let line = 0.86 + 0.14 * sin(uv.y * 900.0)
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let seam = smoothstep(0.0, 0.06, band01) * smoothstep(0.0, 0.06, 1.0 - band01)
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rgb = rgb * (line * (0.35 + 0.65 * seam))
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// The head itself: a bar of col_a with a col_c core.
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let edge = pow(1.0 - age, 60.0)
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rgb = rgb + self.col_a.xyz * (hot * 0.35) + self.col_c.xyz * (edge * 0.9)
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// A band that has not been scanned yet sits in col_b's dark.
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rgb = rgb.mix(self.col_bg.xyz + self.col_b.xyz * 0.06, (1.0 - hot) * 0.22)
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// Without real content (cmix 0) the fallback pattern is all
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// there is, so lift it a little to keep the frame alive.
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let lift = 1.0 + (1.0 - clamp(cmix, 0.0, 1.0)) * 0.25
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return vec4(rgb * (self.fog.y * lift), 1.0)
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}
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}
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}
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