Cleaned up config by moving its responsibilities into the passes

TODO.txt

@@ -1,34 +1,11 @@
 TODO:
 
-Clean up config.js
-  Too many responsibilities
-    Pass-specific properties should be made into uniforms in the passes
+Deja vu effect: flashing rows
+  Make them flash all the time
+  Then use a thunder-like pattern to show and hide the flash
 
-Reach out to someone about producing sounds
+Sounds
   Raindrop sound
-    https://youtu.be/bPhu01wpf0k?t=34
-    https://youtu.be/Yt2-h13XK7Y?t=33
   Deja vu sound
-    https://youtu.be/XfEuxRDYiyc?t=17
-  Square sound
-    https://youtu.be/ngnlBZNuVb8?t=204
-    https://youtu.be/-al0i3zSyj0?t=68
-    https://youtu.be/d8My5jIaXoY?t=191
-  Neo flying, apparently
-    https://youtu.be/gZzTVJ-NLYQ?t=230
+  ripple sound
   And some kind of ambient sound that they play over
-
-Much later:
-  Deluxe compute variables
-    Flashing row effect
-    Neo flying
-      Staticky julia set looking silhouette
-  More patterns?
-    Symbol duplication is common
-
-
-
-
-Also interesting:
-  The Matrix code for the Zion Control construct is sparser, slower, bluer, and annotated
-    https://www.youtube.com/watch?v=Jt5z3OEjDzU

js/bloomPass.js

@@ -1,4 +1,10 @@
-import { makePassFBO, makePyramid, resizePyramid, makePass } from "./utils.js";
+import {
+  extractEntries,
+  makePassFBO,
+  makePyramid,
+  resizePyramid,
+  makePass
+} from "./utils.js";
 
 // The bloom pass is basically an added high-pass blur.
 
@@ -10,7 +16,14 @@ const levelStrengths = Array(pyramidHeight)
   )
   .reverse();
 
-export default (regl, { bloomSize }, input) => {
+export default (regl, config, input) => {
+  const uniforms = extractEntries(config, [
+    "bloomRadius",
+    "bloomSize",
+    "bloomStrength",
+    "highPassThreshold"
+  ]);
+
   const highPassPyramid = makePyramid(regl, pyramidHeight);
   const hBlurPyramid = makePyramid(regl, pyramidHeight);
   const vBlurPyramid = makePyramid(regl, pyramidHeight);
@@ -34,6 +47,7 @@ export default (regl, { bloomSize }, input) => {
       }
     `,
     uniforms: {
+      ...uniforms,
       tex: regl.prop("tex")
     },
     framebuffer: regl.prop("fbo")
@@ -45,10 +59,10 @@ export default (regl, { bloomSize }, input) => {
   const blur = regl({
     frag: `
       precision mediump float;
-      varying vec2 vUV;
+      uniform float width, height;
       uniform sampler2D tex;
       uniform vec2 direction;
-      uniform float width, height;
+      varying vec2 vUV;
       void main() {
         vec2 size = width > height ? vec2(width / height, 1.) : vec2(1., height / width);
         gl_FragColor =
@@ -60,6 +74,7 @@ export default (regl, { bloomSize }, input) => {
       }
     `,
     uniforms: {
+      ...uniforms,
       tex: regl.prop("tex"),
       direction: regl.prop("direction"),
       height: regl.context("viewportWidth"),
@@ -90,6 +105,7 @@ export default (regl, { bloomSize }, input) => {
       }
     `,
     uniforms: {
+      ...uniforms,
       tex: input,
       ...Object.fromEntries(
         vBlurPyramid.map((fbo, index) => [`pyr_${index}`, fbo])
@@ -98,8 +114,6 @@ export default (regl, { bloomSize }, input) => {
     framebuffer: output
   });
 
-  const scale = bloomSize;
-
   return makePass(
     output,
     () => {
@@ -114,9 +128,9 @@ export default (regl, { bloomSize }, input) => {
     },
     (w, h) => {
       // The blur pyramids can be lower resolution than the screen.
-      resizePyramid(highPassPyramid, w, h, scale);
-      resizePyramid(hBlurPyramid, w, h, scale);
-      resizePyramid(vBlurPyramid, w, h, scale);
+      resizePyramid(highPassPyramid, w, h, config.bloomSize);
+      resizePyramid(hBlurPyramid, w, h, config.bloomSize);
+      resizePyramid(vBlurPyramid, w, h, config.bloomSize);
       output.resize(w, h);
     }
   );

js/config.js

@@ -17,8 +17,10 @@ const fonts = {
 };
 
 const defaults = {
+  animationSpeed: 1,
   bloomRadius: 0.5,
   bloomStrength: 1,
+  bloomSize: 0.5,
   highPassThreshold: 0.3,
   cycleSpeed: 1,
   cycleStyleName: "cycleFasterWhenDimmed",
@@ -107,7 +109,7 @@ const versions = {
       { rgb: [1.0, 1.0, 0.9], at: 1.0 }
     ],
     raindropLength: 0.6,
-    slant: 360 / 16
+    slant: (22.5 * Math.PI) / 180
   },
   paradise: {
     ...defaults,
@@ -136,146 +138,56 @@ const versions = {
 versions.throwback = versions.operator;
 versions["1999"] = versions.classic;
 
-export default (searchString, make1DTexture) => {
-  const urlParams = new URLSearchParams(searchString);
-  const getParam = (keyOrKeys, defaultValue) => {
-    if (Array.isArray(keyOrKeys)) {
-      const keys = keyOrKeys;
-      const key = keys.find(key => urlParams.has(key));
-      return key != null ? urlParams.get(key) : defaultValue;
-    } else {
-      const key = keyOrKeys;
-      return urlParams.has(key) ? urlParams.get(key) : defaultValue;
-    }
-  };
+const range = (f, min = -Infinity, max = Infinity) =>
+  Math.max(min, Math.min(max, f));
+const nullNaN = f => (isNaN(f) ? null : f);
 
-  const versionName = getParam("version", "classic");
-  const version =
-    versions[versionName] == null ? versions.classic : versions[versionName];
-
-  const config = { ...version };
-
-  config.animationSpeed = parseFloat(getParam("animationSpeed", 1));
-  config.fallSpeed *= parseFloat(getParam("fallSpeed", 1));
-  config.cycleSpeed *= parseFloat(getParam("cycleSpeed", 1));
-  config.numColumns = parseInt(getParam("width", config.numColumns));
-  config.raindropLength = parseFloat(
-    getParam(["raindropLength", "dropLength"], config.raindropLength)
-  );
-  config.glyphSequenceLength = config.glyphSequenceLength;
-  config.slant =
-    (parseFloat(getParam(["slant", "angle"], config.slant)) * Math.PI) / 180;
-  config.slantVec = [Math.cos(config.slant), Math.sin(config.slant)];
-  config.slantScale =
-    1 / (Math.abs(Math.sin(2 * config.slant)) * (Math.sqrt(2) - 1) + 1);
-  config.glyphEdgeCrop = parseFloat(getParam("encroach", config.glyphEdgeCrop));
-  config.glyphHeightToWidth = parseFloat(
-    getParam("stretch", config.glyphHeightToWidth)
-  );
-  config.cursorEffectThreshold = getParam(
-    "cursorEffectThreshold",
-    config.cursorEffectThreshold
-  );
-  config.bloomSize = Math.max(
-    0.01,
-    Math.min(1, parseFloat(getParam("bloomSize", 0.5)))
-  );
-  config.effect = getParam("effect", "plain");
-  config.bgURL = getParam(
-    "url",
-    "https://upload.wikimedia.org/wikipedia/commons/0/0a/Flammarion_Colored.jpg"
-  );
-  config.customStripes = getParam(
-    "colors",
-    "0.4,0.15,0.1,0.4,0.15,0.1,0.8,0.8,0.6,0.8,0.8,0.6,1.0,0.7,0.8,1.0,0.7,0.8,"
-  )
-    .split(",")
-    .map(parseFloat);
-  config.showComputationTexture = config.effect === "none";
-
-  switch (config.cycleStyleName) {
-    case "cycleFasterWhenDimmed":
-      config.cycleStyle = 0;
-      break;
-    case "cycleRandomly":
-    default:
-      config.cycleStyle = 1;
-      break;
-  }
-
-  switch (config.rippleTypeName) {
-    case "box":
-      config.rippleType = 0;
-      break;
-    case "circle":
-      config.rippleType = 1;
-      break;
-    default:
-      config.rippleType = -1;
-  }
-
-  const PALETTE_SIZE = 2048;
-  const paletteColors = Array(PALETTE_SIZE);
-  const sortedEntries = version.paletteEntries
-    .slice()
-    .sort((e1, e2) => e1.at - e2.at)
-    .map(entry => ({
-      rgb: entry.rgb,
-      arrayIndex: Math.floor(
-        Math.max(Math.min(1, entry.at), 0) * (PALETTE_SIZE - 1)
-      )
-    }));
-  sortedEntries.unshift({ rgb: sortedEntries[0].rgb, arrayIndex: 0 });
-  sortedEntries.push({
-    rgb: sortedEntries[sortedEntries.length - 1].rgb,
-    arrayIndex: PALETTE_SIZE - 1
-  });
-  sortedEntries.forEach((entry, index) => {
-    paletteColors[entry.arrayIndex] = entry.rgb.slice();
-    if (index + 1 < sortedEntries.length) {
-      const nextEntry = sortedEntries[index + 1];
-      const diff = nextEntry.arrayIndex - entry.arrayIndex;
-      for (let i = 0; i < diff; i++) {
-        const ratio = i / diff;
-        paletteColors[entry.arrayIndex + i] = [
-          entry.rgb[0] * (1 - ratio) + nextEntry.rgb[0] * ratio,
-          entry.rgb[1] * (1 - ratio) + nextEntry.rgb[1] * ratio,
-          entry.rgb[2] * (1 - ratio) + nextEntry.rgb[2] * ratio
-        ];
-      }
-    }
-  });
-
-  config.palette = make1DTexture(paletteColors.flat().map(i => i * 0xff));
-
-  let stripeColors = [0, 0, 0];
-
-  if (config.effect === "pride") {
-    config.effect = "stripes";
-    config.stripeColors = [
-      [1, 0, 0],
-      [1, 0.5, 0],
-      [1, 1, 0],
-      [0, 1, 0],
-      [0, 0, 1],
-      [0.8, 0, 1]
-    ].flat();
-  }
-
-  if (config.effect === "customStripes" || config.effect === "stripes") {
-    config.effect = "stripes";
-    const numStripeColors = Math.floor(config.stripeColors.length / 3);
-    stripeColors = config.stripeColors.slice(0, numStripeColors * 3);
-  }
-
-  config.stripes = make1DTexture(stripeColors.map(f => Math.floor(f * 0xff)));
-
-  const uniforms = Object.fromEntries(
-    Object.entries(config).filter(([key, value]) => {
-      const type = typeof (Array.isArray(value) ? value[0] : value);
-      return type !== "string" && type !== "object";
-    })
-  );
-
-  return [config, uniforms];
+const paramMapping = {
+  version: { key: "version", parser: s => s },
+  effect: { key: "effect", parser: s => s },
+  width: { key: "numColumns", parser: s => nullNaN(parseInt(s)) },
+  animationSpeed: {
+    key: "animationSpeed",
+    parser: s => nullNaN(parseFloat(s))
+  },
+  cycleSpeed: { key: "cycleSpeed", parser: s => nullNaN(parseFloat(s)) },
+  fallSpeed: { key: "fallSpeed", parser: s => nullNaN(parseFloat(s)) },
+  raindropLength: {
+    key: "raindropLength",
+    parser: s => nullNaN(parseFloat(s))
+  },
+  slant: {
+    key: "slant",
+    parser: s => nullNaN((parseFloat(s) * Math.PI) / 180)
+  },
+  bloomSize: {
+    key: "bloomSize",
+    parser: s => nullNaN(range(parseFloat(s), 0.01, 1))
+  },
+  url: { key: "bgURL", parser: s => s },
+  colors: { key: "stripeColors", parser: s => s }
+};
+paramMapping.dropLength = paramMapping.raindropLength;
+paramMapping.angle = paramMapping.slant;
+
+export default (searchString, make1DTexture) => {
+  const urlParams = Object.fromEntries(
+    Array.from(new URLSearchParams(searchString).entries())
+      .filter(([key]) => key in paramMapping)
+      .map(([key, value]) => [
+        paramMapping[key].key,
+        paramMapping[key].parser(value)
+      ])
+      .filter(([_, value]) => value != null)
+  );
+
+  const version =
+    urlParams.version in versions
+      ? versions[urlParams.version]
+      : versions.classic;
+
+  return {
+    ...version,
+    ...urlParams
+  };
 };

js/imagePass.js

@@ -1,7 +1,11 @@
 import { loadImage, makePassFBO, makePass } from "./utils.js";
 
-export default (regl, { bgURL }, input) => {
+const defaultBGURL =
+  "https://upload.wikimedia.org/wikipedia/commons/0/0a/Flammarion_Colored.jpg";
+
+export default (regl, config, input) => {
   const output = makePassFBO(regl);
+  const bgURL = "bgURL" in config ? config.bgURL : defaultBGURL;
   const bgLoader = loadImage(regl, bgURL);
   return makePass(
     output,

js/main.js

@@ -1,4 +1,4 @@
-import { makeFullScreenQuad, make1DTexture, makePipeline } from "./utils.js";
+import { makeFullScreenQuad, makePipeline } from "./utils.js";
 import makeConfig from "./config.js";
 import makeMatrixRenderer from "./renderer.js";
 import makeBloomPass from "./bloomPass.js";
@@ -26,13 +26,13 @@ const regl = createREGL({
 const effects = {
   none: null,
   plain: makePalettePass,
+  customStripes: makeStripePass,
   stripes: makeStripePass,
+  pride: makeStripePass,
   image: makeImagePass
 };
 
-const [config, uniforms] = makeConfig(window.location.search, data =>
-  make1DTexture(regl, data)
-);
+const config = makeConfig(window.location.search);
 const effect = config.effect in effects ? config.effect : "plain";
 
 const resize = () => {
@@ -44,7 +44,7 @@ resize();
 
 document.body.onload = async () => {
   // All this takes place in a full screen quad.
-  const fullScreenQuad = makeFullScreenQuad(regl, uniforms);
+  const fullScreenQuad = makeFullScreenQuad(regl);
   const pipeline = makePipeline(
     [
       makeMatrixRenderer,
@@ -61,7 +61,8 @@ document.body.onload = async () => {
     }
   });
   await Promise.all(pipeline.map(({ ready }) => ready));
-  regl.frame(({ viewportWidth, viewportHeight }) => {
+  const tick = regl.frame(({ viewportWidth, viewportHeight }) => {
+    // tick.cancel();
     pipeline.forEach(({ resize }) => resize(viewportWidth, viewportHeight));
     fullScreenQuad(() => {
       pipeline.forEach(({ render }) => render());

js/palettePass.js

@@ -1,4 +1,4 @@
-import { makePassFBO, makePass } from "./utils.js";
+import { make1DTexture, makePassFBO, makePass } from "./utils.js";
 
 // The rendered texture's values are mapped to colors in a palette texture.
 // A little noise is introduced, to hide the banding that appears
@@ -6,8 +6,43 @@ import { makePassFBO, makePass } from "./utils.js";
 // won't persist across subsequent frames. This is a safe trick
 // in screen space.
 
-export default (regl, {}, input) => {
+export default (regl, config, input) => {
   const output = makePassFBO(regl);
+
+  const PALETTE_SIZE = 2048;
+  const paletteColors = Array(PALETTE_SIZE);
+  const sortedEntries = config.paletteEntries
+    .slice()
+    .sort((e1, e2) => e1.at - e2.at)
+    .map(entry => ({
+      rgb: entry.rgb,
+      arrayIndex: Math.floor(
+        Math.max(Math.min(1, entry.at), 0) * (PALETTE_SIZE - 1)
+      )
+    }));
+  sortedEntries.unshift({ rgb: sortedEntries[0].rgb, arrayIndex: 0 });
+  sortedEntries.push({
+    rgb: sortedEntries[sortedEntries.length - 1].rgb,
+    arrayIndex: PALETTE_SIZE - 1
+  });
+  sortedEntries.forEach((entry, index) => {
+    paletteColors[entry.arrayIndex] = entry.rgb.slice();
+    if (index + 1 < sortedEntries.length) {
+      const nextEntry = sortedEntries[index + 1];
+      const diff = nextEntry.arrayIndex - entry.arrayIndex;
+      for (let i = 0; i < diff; i++) {
+        const ratio = i / diff;
+        paletteColors[entry.arrayIndex + i] = [
+          entry.rgb[0] * (1 - ratio) + nextEntry.rgb[0] * ratio,
+          entry.rgb[1] * (1 - ratio) + nextEntry.rgb[1] * ratio,
+          entry.rgb[2] * (1 - ratio) + nextEntry.rgb[2] * ratio
+        ];
+      }
+    }
+  });
+
+  const palette = make1DTexture(regl, paletteColors.flat().map(i => i * 0xff));
+
   return makePass(
     output,
     regl({
@@ -35,6 +70,7 @@ export default (regl, {}, input) => {
 
       uniforms: {
         tex: input,
+        palette,
         ditherMagnitude: 0.05
       },
       framebuffer: output

js/renderer.js

@@ -1,4 +1,20 @@
-import { loadImage, makePassFBO, makeDoubleBuffer, makePass } from "./utils.js";
+import {
+  extractEntries,
+  loadImage,
+  makePassFBO,
+  makeDoubleBuffer,
+  makePass
+} from "./utils.js";
+
+const rippleTypes = {
+  box: 0,
+  circle: 1
+};
+
+const cycleStyles = {
+  cycleFasterWhenDimmed: 0,
+  cycleRandomly: 1
+};
 
 export default (regl, config) => {
   // These two framebuffers are used to compute the raining code.
@@ -16,6 +32,47 @@ export default (regl, config) => {
 
   const output = makePassFBO(regl);
 
+  const uniforms = extractEntries(config, [
+    // rain general
+    "glyphHeightToWidth",
+    "glyphTextureColumns",
+    "numColumns",
+    // rain update
+    "animationSpeed",
+    "brightnessMinimum",
+    "brightnessMix",
+    "brightnessMultiplier",
+    "brightnessOffset",
+    "cursorEffectThreshold",
+    "cycleSpeed",
+    "fallSpeed",
+    "glyphSequenceLength",
+    "hasSun",
+    "hasThunder",
+    "raindropLength",
+    "rippleScale",
+    "rippleSpeed",
+    "rippleThickness",
+    // rain render
+    "glyphEdgeCrop",
+    "isPolar"
+  ]);
+
+  uniforms.rippleType =
+    config.rippleTypeName in rippleTypes
+      ? rippleTypes[config.rippleTypeName]
+      : -1;
+  uniforms.cycleStyle =
+    config.cycleStyleName in cycleStyles
+      ? cycleStyles[config.cycleStyleName]
+      : 0;
+  uniforms.slantVec = [Math.cos(config.slant), Math.sin(config.slant)];
+  uniforms.slantScale =
+    1 / (Math.abs(Math.sin(2 * config.slant)) * (Math.sqrt(2) - 1) + 1);
+  uniforms.showComputationTexture = config.effect === "none";
+
+  const msdfLoader = loadImage(regl, config.glyphTexURL);
+
   // This shader is the star of the show.
   // In normal operation, each pixel represents a glyph's:
   //   R: brightness
@@ -30,34 +87,19 @@ export default (regl, config) => {
       #define SQRT_2 1.4142135623730951
       #define SQRT_5 2.23606797749979
 
+      uniform float time;
       uniform float numColumns;
       uniform sampler2D lastState;
-
       uniform bool hasSun;
       uniform bool hasThunder;
       uniform bool showComputationTexture;
-
-      uniform float brightnessMinimum;
-      uniform float brightnessMultiplier;
-      uniform float brightnessOffset;
-      uniform float brightnessMix;
-
-      uniform float time;
-      uniform float animationSpeed;
-      uniform float cycleSpeed;
-      uniform float fallSpeed;
+      uniform float brightnessMinimum, brightnessMultiplier, brightnessOffset, brightnessMix;
+      uniform float animationSpeed, fallSpeed, cycleSpeed;
       uniform float raindropLength;
-
-      uniform float glyphHeightToWidth;
-      uniform float glyphSequenceLength;
-      uniform float glyphTextureColumns;
+      uniform float glyphHeightToWidth, glyphSequenceLength, glyphTextureColumns;
       uniform int cycleStyle;
-
-      uniform float rippleScale;
-      uniform float rippleSpeed;
-      uniform float rippleThickness;
+      uniform float rippleScale, rippleSpeed, rippleThickness;
       uniform int rippleType;
-
       uniform float cursorEffectThreshold;
 
       float max2(vec2 v) {
@@ -88,10 +130,10 @@ export default (regl, config) => {
 
       float getGlyphCycleSpeed(float rainTime, float brightness) {
         float glyphCycleSpeed = 0.0;
-        if (cycleStyle == 1) {
-          glyphCycleSpeed = fract((rainTime + 0.7 * sin(SQRT_2 * rainTime) + 1.1 * sin(SQRT_5 * rainTime))) * 0.75;
-        } else if (cycleStyle == 0 && brightness > 0.0) {
+        if (cycleStyle == 0 && brightness > 0.0) {
           glyphCycleSpeed = pow(1.0 - brightness, 4.0);
+        } else if (cycleStyle == 1) {
+          glyphCycleSpeed = fract((rainTime + 0.7 * sin(SQRT_2 * rainTime) + 1.1 * sin(SQRT_5 * rainTime))) * 0.75;
         }
         return glyphCycleSpeed;
       }
@@ -207,20 +249,18 @@ export default (regl, config) => {
     `,
 
     uniforms: {
+      ...uniforms,
       lastState: doubleBuffer.back
     },
 
     framebuffer: doubleBuffer.front
   });
 
-  const msdfLoader = loadImage(regl, config.glyphTexURL);
-
   // We render the code into an FBO using MSDFs: https://github.com/Chlumsky/msdfgen
   const render = regl({
     vert: `
       attribute vec2 aPosition;
-      uniform float width;
-      uniform float height;
+      uniform float width, height;
       varying vec2 vUV;
       void main() {
         vUV = aPosition / 2.0 + 0.5;
@@ -237,15 +277,11 @@ export default (regl, config) => {
       #endif
       precision lowp float;
 
-      uniform sampler2D glyphTex;
-      uniform sampler2D lastState;
       uniform float numColumns;
-      uniform float glyphTextureColumns;
+      uniform sampler2D glyphTex, lastState;
+      uniform float glyphHeightToWidth, glyphTextureColumns, glyphEdgeCrop;
       uniform vec2 slantVec;
       uniform float slantScale;
-      uniform float glyphHeightToWidth;
-      uniform float glyphEdgeCrop;
-
       uniform bool isPolar;
       uniform bool showComputationTexture;
 
@@ -309,6 +345,7 @@ export default (regl, config) => {
     `,
 
     uniforms: {
+      ...uniforms,
       glyphTex: msdfLoader.texture,
       height: regl.context("viewportWidth"),
       width: regl.context("viewportHeight"),

js/stripePass.js

@@ -1,7 +1,38 @@
-import { makePassFBO, makePass } from "./utils.js";
+import { make1DTexture, makePassFBO, makePass } from "./utils.js";
 
-export default (regl, {}, input) => {
+const neapolitanStripeColors = [
+  [0.4, 0.15, 0.1],
+  [0.4, 0.15, 0.1],
+  [0.8, 0.8, 0.6],
+  [0.8, 0.8, 0.6],
+  [1.0, 0.7, 0.8],
+  [1.0, 0.7, 0.8]
+].flat();
+
+const prideStripeColors = [
+  [1, 0, 0],
+  [1, 0.5, 0],
+  [1, 1, 0],
+  [0, 1, 0],
+  [0, 0, 1],
+  [0.8, 0, 1]
+].flat();
+
+export default (regl, config, input) => {
   const output = makePassFBO(regl);
+
+  const stripeColors =
+    "stripeColors" in config
+      ? config.stripeColors.split(",").map(parseFloat)
+      : config.effect === "pride"
+      ? prideStripeColors
+      : neapolitanStripeColors;
+  const numStripeColors = Math.floor(stripeColors.length / 3);
+  const stripes = make1DTexture(
+    regl,
+    stripeColors.slice(0, numStripeColors * 3).map(f => Math.floor(f * 0xff))
+  );
+
   return makePass(
     output,
     regl({
@@ -12,24 +43,26 @@ export default (regl, {}, input) => {
       uniform sampler2D tex;
       uniform sampler2D stripes;
       uniform float ditherMagnitude;
+      uniform float time;
       varying vec2 vUV;
 
-      highp float rand( const in vec2 uv ) {
+      highp float rand( const in vec2 uv, const in float t ) {
         const highp float a = 12.9898, b = 78.233, c = 43758.5453;
         highp float dt = dot( uv.xy, vec2( a,b ) ), sn = mod( dt, PI );
-        return fract(sin(sn) * c);
+        return fract(sin(sn) * c + t);
       }
 
       void main() {
-        vec3 color = texture2D(stripes, vUV).rgb - rand( gl_FragCoord.xy ) * ditherMagnitude;
-        float brightness = texture2D(tex, vUV).r;
+        vec3 color = texture2D(stripes, vUV).rgb;
+        float brightness = texture2D(tex, vUV).r - rand( gl_FragCoord.xy, time ) * ditherMagnitude;
         gl_FragColor = vec4(color * brightness, 1.0);
       }
     `,
 
       uniforms: {
         tex: input,
-        ditherMagnitude: 0.1
+        stripes,
+        ditherMagnitude: 0.05
       },
       framebuffer: output
     })

js/utils.js

@@ -1,3 +1,8 @@
+const extractEntries = (src, keys) =>
+  Object.fromEntries(
+    Array.from(Object.entries(src)).filter(([key]) => keys.includes(key))
+  );
+
 const makePassTexture = regl =>
   regl.texture({
     width: 1,
@@ -167,6 +172,7 @@ const makePipeline = (steps, getInput, ...params) =>
     );
 
 export {
+  extractEntries,
   makePassTexture,
   makePassFBO,
   makeDoubleBuffer,