feat: sine filter

packages/filters/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

packages/filters/build/.flecksrc.js

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+module.exports = {
+  stubs: {
+    server: [
+      /\.(frag|glsl|vert)$/,
+    ],
+  },
+};

packages/filters/build/fleck.neutrinorc.js

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+module.exports = async (flecks) => {
+  // eslint-disable-next-line import/no-extraneous-dependencies, global-require
+  const config = await require('@flecks/fleck/server/build/fleck.neutrinorc')(flecks);
+  config.use.push(({config}) => {
+    config.module
+      .rule('glsl')
+      .test(/\.(frag|glsl|vert)$/)
+      .use('glsl')
+      .loader(require.resolve('webpack-glsl-loader'));
+  });
+  return config;
+};

packages/filters/package.json

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+{
+  "name": "@avocado/filters",
+  "version": "1.0.0",
+  "scripts": {
+    "build": "flecks build",
+    "clean": "flecks clean",
+    "lint": "flecks lint",
+    "postversion": "cp package.json dist",
+    "test": "flecks test"
+  },
+  "files": [
+    "build",
+    "client.js",
+    "client.js.map",
+    "server.js",
+    "server.js.map",
+    "src",
+    "test"
+  ],
+  "dependencies": {
+    "@flecks/core": "^1.0.0",
+    "@pixi/core": "^5.3.9",
+    "webpack-glsl-loader": "^1.0.1"
+  },
+  "devDependencies": {
+    "@flecks/fleck": "^1.0.0"
+  }
+}

packages/filters/src/client.js

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+// eslint-disable-next-line import/prefer-default-export
+export {default as HorizontalSine} from './horizontal-sine';

packages/filters/src/horizontal-sine/index.frag

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+precision highp float;
+
+#define PI_D3 1.047197551
+
+varying vec2 vTextureCoord;
+uniform vec4 filterArea;
+uniform sampler2D uSampler;
+
+uniform float frequency;
+uniform bool isPixelated;
+uniform float magnitude;
+uniform float offset;
+uniform float scale;
+
+vec2 denormalizeCoordinates(vec2 coord) {
+  return coord * filterArea.xy + filterArea.zw;
+}
+
+vec2 normalizeCoordinates( vec2 coord ) {
+  return (coord - filterArea.zw) / filterArea.xy;
+}
+
+void main(void) {
+  // Denormalize coordinates.
+  vec2 coord = denormalizeCoordinates(vTextureCoord);
+  // Calculate rotation radians.
+  float rads = mod(
+    frequency * ((((isPixelated ? floor(offset) : offset) * scale) + coord.y) / scale),
+    6.
+  );
+  if (isPixelated) {
+    rads = floor(rads / frequency) * frequency;
+  }
+  // Apply horizontal shift.
+  float xOff = scale * magnitude * cos(PI_D3 * rads);
+  if (isPixelated) {
+    xOff = floor(xOff / scale) * scale;
+  }
+  coord.x += xOff;
+  // Normalize and apply coordinates.
+  coord = normalizeCoordinates(coord);
+  gl_FragColor = texture2D(uSampler, coord);
+}

packages/filters/src/horizontal-sine/index.js

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+import {defaultVertex, Filter} from '../imports';
+import frag from './index.frag';
+
+export default class HorizontalSine extends Filter {
+
+  constructor() {
+    super(defaultVertex, frag);
+    this.frequency = 1;
+    this.isPixelated = false;
+    this.magnitude = 0;
+    this.offset = 0;
+    this.scale = 1;
+  }
+
+  get frequency() {
+    return this.uniforms.frequency;
+  }
+
+  set frequency(frequency) {
+    this.uniforms.frequency = frequency;
+  }
+
+  get isPixelated() {
+    return this.uniforms.isPixelated;
+  }
+
+  set isPixelated(isPixelated) {
+    this.uniforms.isPixelated = isPixelated;
+  }
+
+  get magnitude() {
+    return this.uniforms.magnitude;
+  }
+
+  set magnitude(magnitude) {
+    this.uniforms.magnitude = magnitude;
+  }
+
+  get offset() {
+    return this.uniforms.offset;
+  }
+
+  set offset(offset) {
+    this.uniforms.offset = offset;
+  }
+
+  get scale() {
+    return this.uniforms.scale;
+  }
+
+  set scale(scale) {
+    this.uniforms.scale = scale;
+  }
+
+}

packages/filters/src/imports.js

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+let defaultVertex;
+let Filter;
+if ('web' === process.env.FLECKS_CORE_BUILD_TARGET) {
+  // eslint-disable-next-line global-require
+  ({defaultVertex, Filter} = require('@pixi/core'));
+}
+else {
+  Filter = class {};
+}
+
+exports.defaultVertex = defaultVertex;
+exports.Filter = Filter;

packages/filters/src/server.js

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+import {Hooks} from '@flecks/core';
+
+export default {
+  [Hooks]: {
+    '@flecks/core.build': (target, config) => {
+      config.use.push(({config}) => {
+        config.module
+          .rule('glsl')
+          .test(/\.(frag|glsl|vert)$/)
+          .use('glsl')
+          .loader(require.resolve('webpack-glsl-loader'));
+      });
+    },
+  },
+};