e2e5104646
Forty-nine scenes carried their own `glow`, every one of the sixty-five added its own grain, and a handful had bloom, chroma, haze, smear or trail besides — all of which the post chain already does, with an envelope and a threshold no scene can see. Two uncoordinated effect layers is the smaller half of the problem. The larger half is that an effect knob sampled per song makes a scene look varied across parameter draws while its structure never moves, so the gallery and the variety harness were both being told a scene was original when only its halo had changed. Removed in three shapes. Scene grain goes entirely — the post chain owns it. Statements that ADD a falloff term scaled by the effect are bloom by another name and are deleted. What remains is an intensity on something already drawn, so the uniform is pinned to its default and the knob deleted: the picture survives, the fake variety does not. Reactive entries driving those params went too, since an effect modulated by the audio was the most convincing fake of the lot. That broke the style trait, which is the interesting part. Surface treatment had been leaving the scenes for two commits — sigGrain to post, sigEdge to inkStroke — and removing the last of it left `style` with almost nothing to express: a style+shape signature had two eligible scenes in the whole library. The trait is not obsolete, it has moved, so inkStroke and inkMask now read u_sigLine and u_sigSoft alongside the ink's own weight and edge. A scene drawing in the song's hand honours the track's line weight by construction, and the runtime probe confirms it rather than taking it on trust. This reverses a call made two commits ago for a reason that only became true now. One check needed re-aiming rather than fixing. Two independently built shows are two WebGL contexts, and engine/hash.js says at the top that bit-exactness is a same-context guarantee; the check had been demanding it anyway and getting away with it because the scenes it happened to cast were bit-stable. A casting change put smooth-gradient scenes in frame and the last bit moved. Measured before touching the check: three levels out of 255 across 2.6% of pixels, invisible. The cross-context comparison is now a distance with a ceiling of four, and bit-exactness within one show is still demanded by the check below it. 89/89 checks, 11/11 tests, all static gates. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
90 lines
4.0 KiB
JavaScript
90 lines
4.0 KiB
JavaScript
// Minimal family: backlit paper screens in a wooden frame. A few big panels, a
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// lamp somewhere behind them, and the track's signature form showing through
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// one or two as a soft silhouette. The screens slide.
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//
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// Moiré Grid is the other minimal built on a grid, and it is a grid of hundreds
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// of lines existing to interfere. This is a grid of six or eight PANELS: the
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// count is small enough to read as objects, the frame is opaque, and almost the
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// whole image is flat diffuse paper. What changes is which panel the light is
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// behind and how far the screens have slid — not the pattern.
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export const shojiGrid = {
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name: 'Shoji Grid',
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family: 'minimal',
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kind: 'fragment',
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// Paper has a tooth, and this is the one scene that wants it.
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texture: 1.0,
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consumes: ['cast', 'ink'],
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traits: ['shape', 'camera', 'style'],
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params: {
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cols: { type: 'int', range: [2, 7], default: 4, uniform: 'u_cols', bias: 'density' },
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rows: { type: 'int', range: [1, 4], default: 2, uniform: 'u_rows' },
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slide: { type: 'float', range: [-1.2, 1.2], default: 0.0, uniform: 'u_slide' },
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stile: { type: 'float', range: [0.02, 0.16], default: 0.06, uniform: 'u_stile' },
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lamp: { type: 'float', range: [0.15, 1.6], default: 0.7, uniform: 'u_lamp', bias: 'energy', slowAxis: true },
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form: { type: 'float', range: [0, 0.5], default: 0.26, uniform: 'u_form' },
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fibre: { type: 'float', range: [0, 1], default: 0.45, uniform: 'u_fibre' },
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sway: { type: 'float', range: [0.06, 0.5], default: 0.16, uniform: 'u_sway', bias: 'motion', rate: true },
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palette: { type: 'palette', count: 5 },
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},
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reactive: {
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form: { feature: 'loudness', amount: 0.25, response: 'smooth' },
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fibre: { feature: 'bandAir', amount: 0.3, response: 'smooth' },
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},
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shader: `
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vec4 scene(vec2 uv, vec2 p) {
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float t = u_time * u_sway + u_seed;
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p = sigCamera(p);
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// The lamp behind the screens. One soft source, wandering slowly, and the
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// only reason any panel is brighter than another.
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vec2 lampAt = vec2(sin(t * 1.6) * 0.9, cos(t * 1.13) * 0.5);
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float glowField = exp(-length(p - lampAt) * 1.3) * u_lamp;
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// The screen grid. Alternate rows slide in opposite directions, which is
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// what makes it read as panels that MOVE rather than as a printed grid.
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float ry = floor((p.y * 0.5 + 0.5) * float(u_rows));
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float dir = mod(ry, 2.0) < 0.5 ? 1.0 : -1.0;
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float gx = (p.x * 0.5 + 0.5) * float(u_cols) + u_slide * dir;
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float gy = (p.y * 0.5 + 0.5) * float(u_rows);
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vec2 cell = vec2(floor(gx), floor(gy));
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vec2 f = vec2(fract(gx), fract(gy)) - 0.5;
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// Paper: warm, flat, with the light from behind soaking through it.
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float paperN = fbm(vec2(p.x * 40.0, p.y * 6.0) + cell * 3.7, 3);
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vec3 col = pal(1) * (0.12 + glowField * 0.55);
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col += pal(3) * glowField * 0.5;
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col *= 0.85 + 0.3 * paperN * u_fibre;
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// A panel or two is lacquered darker, so the row has a rhythm.
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float shade = hash12(cell + 3.0);
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col *= mix(0.55, 1.0, smoothstep(0.25, 0.4, shade));
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// The signature form, showing through the panel it stands behind.
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if (u_form > 0.01) {
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float which = step(0.62, hash12(cell * 1.7 + 9.0));
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vec2 at = vec2(f.x * 2.0 / float(u_cols), f.y * 2.0 / float(u_rows));
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float d = castMain(at / u_form) * u_form;
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col = mix(col, col * 0.35 + pal(4) * glowField * 0.35,
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smoothstep(0.01, -0.01, d) * which);
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col += pal(4) * inkStroke(d) * which * glowField * 0.7;
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}
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// The frame. Opaque, in front of everything, and the thing that makes the
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// panels objects instead of regions.
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float bar = min(0.5 - abs(f.x), 0.5 - abs(f.y));
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float wood = smoothstep(u_stile, u_stile * 0.4, bar);
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col = mix(col, pal(0) * 0.14, wood);
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col += pal(4) * inkStroke(bar - u_stile) * 0.12;
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return vec4(inkValue(col), 1.0);
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}
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`,
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};
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export default shojiGrid;
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