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
87 lines
3.6 KiB
Text
87 lines
3.6 KiB
Text
// SPECTRUM BAR FIELD — the plainest possible reading of the live sound,
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// and the reference for how a document uses the AUDIO PICTURE.
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//
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// Everything here comes from two shader helpers every family carries:
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// self.audio_fft(f, age) spectrum 0..1; f = log frequency 0..1
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// (0 = 30 Hz, 1 = 16 kHz), age = how far back
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// in time 0..1 (0 = now, 1 ~ 5.5 s ago)
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// self.audio_wave(t) waveform -1..1; t = 0..1 across ~1.4 s
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// plus self.audio_env = (bass, mid, high, rms), already smoothed.
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//
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// THE IDLE LAW: with nothing playing every helper reads 0. A look that
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// simply drew the reading would go black on a silent rig, so each preset
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// here floors its level with a small figure off the free-running beat
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// clock — loud audio always wins, silence still performs.
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{
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name: "Spectrum Bar Field"
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engine: "screen"
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seed: 11
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speed: 1.0
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beat_pulse: 0.7
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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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p0: 0.5 p1: 0.5 p2: 0.5
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dials: [
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{name: "GAIN", bind: "p0", default: 0.5},
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{name: "BARS", bind: "p1", default: 0.5},
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{name: "TRAIL", bind: "p2", default: 0.5}
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]
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color_bg: #x04050c
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color_a: #x2af0d0
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color_b: #xff3d7f
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color_c: #xfff2c8
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stages: [
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{kind: "bloom", threshold: 0.5, strength: 1.2, levels: 3}
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]
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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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// BARS quantises the 256 log bins into readable columns.
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let bars = floor(20.0 + 76.0 * clamp(self.user.y, 0.0, 1.0))
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let col = floor(uv.x * bars)
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let f = (col + 0.5) / bars
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let inbar = fract(uv.x * bars)
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// The live reading, floored by an idle figure (see the header).
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let idle = 0.05
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+ 0.045 * sin(f * 11.0 + self.time_beat.x * 1.3)
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+ 0.055 * self.time_beat.w
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let gain = 0.55 + 1.1 * clamp(self.user.x, 0.0, 1.0)
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let lvl = clamp(max(self.audio_fft(f, 0.0), idle) * gain, 0.0, 1.0)
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// TRAIL: the same column a few hops back, drawn dim behind it —
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// a decay that is a TEXTURE READ, never an accumulator.
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let back = 0.015 + 0.16 * clamp(self.user.z, 0.0, 1.0)
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let gh = clamp(max(self.audio_fft(f, back), idle * 0.7) * gain, 0.0, 1.0)
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// uv.y is 0 at the top; height is measured from the floor.
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let h = 1.0 - uv.y
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let gap = smoothstep(0.0, 0.07, inbar) * smoothstep(0.0, 0.07, 1.0 - inbar)
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let fill = smoothstep(0.0, 0.012, lvl - h) * gap
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let ghost = smoothstep(0.0, 0.02, gh - h) * gap * 0.28
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// The cap: a bright lid riding the top of each bar.
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let cap = exp(0.0 - abs(h - lvl) * 110.0) * gap
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// A dim mirrored copy hanging from the ceiling.
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let mirror = smoothstep(0.0, 0.02, lvl * 0.40 - uv.y) * gap * 0.22
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// Colour runs cold at the floor to hot at the cap.
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let t = clamp(h / max(lvl, 0.06), 0.0, 1.0)
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let body = self.col_a.xyz.mix(self.col_b.xyz, t)
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let mut rgb = self.col_bg.xyz
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rgb = rgb + body * (ghost + mirror)
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rgb = rgb + body * fill
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rgb = rgb + self.col_c.xyz * (cap * 1.25)
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// A floor glow that reads the broadband level (audio_env.w),
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// so even a look with no bars alive still shows the room.
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let floorglow = exp(0.0 - h * 14.0) * (0.10 + 0.55 * self.audio_env.w)
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rgb = rgb + self.col_a.xyz * floorglow
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return vec4(rgb * self.fog.y, 1.0)
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}
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}
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}
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