commit c59fd2cb841827c8181d5fc3c1bbcae0f093bc94 · kitten.sh/frag-canvas-element

.gitignore

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       node_modules

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package.json

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       {

     

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         "name": "frag-canvas-element",

     

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         "sideEffects": true,

     

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         "version": "0.1.0",

     

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         "main": "index.js",

     

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         "keywords": [],

     

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         "author": "",

     

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         "license": "ISC",

     

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         "devDependencies": {

     

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         }

     

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       }

+556

pnpm-lock.yaml

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             '@esbuild/openbsd-arm64': 0.25.0

     

       502
       502
       +
             '@esbuild/openbsd-x64': 0.25.0

     

       503
       503
       +
             '@esbuild/sunos-x64': 0.25.0

     

       504
       504
       +
             '@esbuild/win32-arm64': 0.25.0

     

       505
       505
       +
             '@esbuild/win32-ia32': 0.25.0

     

       506
       506
       +
             '@esbuild/win32-x64': 0.25.0

     

       507
       507
       +
       

     

       508
       508
       +
         fsevents@2.3.3:

     

       509
       509
       +
           optional: true

     

       510
       510
       +
       

     

       511
       511
       +
         nanoid@3.3.8: {}

     

       512
       512
       +
       

     

       513
       513
       +
         picocolors@1.1.1: {}

     

       514
       514
       +
       

     

       515
       515
       +
         postcss@8.5.3:

     

       516
       516
       +
           dependencies:

     

       517
       517
       +
             nanoid: 3.3.8

     

       518
       518
       +
             picocolors: 1.1.1

     

       519
       519
       +
             source-map-js: 1.2.1

     

       520
       520
       +
       

     

       521
       521
       +
         rollup@4.34.8:

     

       522
       522
       +
           dependencies:

     

       523
       523
       +
             '@types/estree': 1.0.6

     

       524
       524
       +
           optionalDependencies:

     

       525
       525
       +
             '@rollup/rollup-android-arm-eabi': 4.34.8

     

       526
       526
       +
             '@rollup/rollup-android-arm64': 4.34.8

     

       527
       527
       +
             '@rollup/rollup-darwin-arm64': 4.34.8

     

       528
       528
       +
             '@rollup/rollup-darwin-x64': 4.34.8

     

       529
       529
       +
             '@rollup/rollup-freebsd-arm64': 4.34.8

     

       530
       530
       +
             '@rollup/rollup-freebsd-x64': 4.34.8

     

       531
       531
       +
             '@rollup/rollup-linux-arm-gnueabihf': 4.34.8

     

       532
       532
       +
             '@rollup/rollup-linux-arm-musleabihf': 4.34.8

     

       533
       533
       +
             '@rollup/rollup-linux-arm64-gnu': 4.34.8

     

       534
       534
       +
             '@rollup/rollup-linux-arm64-musl': 4.34.8

     

       535
       535
       +
             '@rollup/rollup-linux-loongarch64-gnu': 4.34.8

     

       536
       536
       +
             '@rollup/rollup-linux-powerpc64le-gnu': 4.34.8

     

       537
       537
       +
             '@rollup/rollup-linux-riscv64-gnu': 4.34.8

     

       538
       538
       +
             '@rollup/rollup-linux-s390x-gnu': 4.34.8

     

       539
       539
       +
             '@rollup/rollup-linux-x64-gnu': 4.34.8

     

       540
       540
       +
             '@rollup/rollup-linux-x64-musl': 4.34.8

     

       541
       541
       +
             '@rollup/rollup-win32-arm64-msvc': 4.34.8

     

       542
       542
       +
             '@rollup/rollup-win32-ia32-msvc': 4.34.8

     

       543
       543
       +
             '@rollup/rollup-win32-x64-msvc': 4.34.8

     

       544
       544
       +
             fsevents: 2.3.3

     

       545
       545
       +
       

     

       546
       546
       +
         source-map-js@1.2.1: {}

     

       547
       547
       +
       

     

       548
       548
       +
         typescript@5.7.3: {}

     

       549
       549
       +
       

     

       550
       550
       +
         vite@6.2.0:

     

       551
       551
       +
           dependencies:

     

       552
       552
       +
             esbuild: 0.25.0

     

       553
       553
       +
             postcss: 8.5.3

     

       554
       554
       +
             rollup: 4.34.8

     

       555
       555
       +
           optionalDependencies:

     

       556
       556
       +
             fsevents: 2.3.3

+324

src/frag-canvas-element.ts

···

       1
       1
       +
       const VS_SOURCE_100 =

     

       2
       2
       +
         'attribute vec2 vPos;\n'

     

       3
       3
       +
           + 'void main() {\n'

     

       4
       4
       +
           + '  gl_Position = vec4(vPos, 0.0, 1.0);\n'

     

       5
       5
       +
           + '}';

     

       6
       6
       +
       const VS_SOURCE_300 =

     

       7
       7
       +
         '#version 300 es\n'

     

       8
       8
       +
           + 'in vec4 vPos;\n'

     

       9
       9
       +
           + 'void main() {\n'

     

       10
       10
       +
           + '  gl_Position = vPos;\n'

     

       11
       11
       +
           + '}';

     

       12
       12
       +
       

     

       13
       13
       +
       const makeDateVector = () => {

     

       14
       14
       +
         const DATE = new Date();

     

       15
       15
       +
         const year = DATE.getFullYear();

     

       16
       16
       +
         const month = DATE.getMonth() + 1;

     

       17
       17
       +
         const day = DATE.getDate();

     

       18
       18
       +
         const time = DATE.getHours() * 60 * 60 + DATE.getMinutes() * 60 + DATE.getSeconds() + DATE.getMilliseconds() * 0.001;

     

       19
       19
       +
         return [year, month, day, time] as const;

     

       20
       20
       +
       };

     

       21
       21
       +
       

     

       22
       22
       +
       interface InitState {

     

       23
       23
       +
         width: number;

     

       24
       24
       +
         height: number;

     

       25
       25
       +
         fragSource: string;

     

       26
       26
       +
       }

     

       27
       27
       +
       

     

       28
       28
       +
       function createState(gl: WebGL2RenderingContext, init: InitState) {

     

       29
       29
       +
         const program = gl.createProgram();

     

       30
       30
       +
       

     

       31
       31
       +
         const vertShader300 = gl.createShader(gl.VERTEX_SHADER);

     

       32
       32
       +
         const vertShader100 = gl.createShader(gl.VERTEX_SHADER);

     

       33
       33
       +
       

     

       34
       34
       +
         const fragShader = gl.createShader(gl.FRAGMENT_SHADER);

     

       35
       35
       +
         if (!vertShader100 || !vertShader300 || !fragShader) {

     

       36
       36
       +
           return null;

     

       37
       37
       +
         }

     

       38
       38
       +
       

     

       39
       39
       +
         gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);

     

       40
       40
       +
       

     

       41
       41
       +
         gl.shaderSource(vertShader100, VS_SOURCE_100);

     

       42
       42
       +
         gl.compileShader(vertShader100);

     

       43
       43
       +
         gl.shaderSource(vertShader300, VS_SOURCE_300);

     

       44
       44
       +
         gl.compileShader(vertShader300);

     

       45
       45
       +
       

     

       46
       46
       +
         const screenVertex = new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]);

     

       47
       47
       +
         const vertexBuffer = gl.createBuffer();

     

       48
       48
       +
         gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);

     

       49
       49
       +
         gl.bufferData(gl.ARRAY_BUFFER, screenVertex, gl.STATIC_DRAW);

     

       50
       50
       +
       

     

       51
       51
       +
         const texture = gl.createTexture();

     

       52
       52
       +
         gl.activeTexture(gl['TEXTURE0']);

     

       53
       53
       +
         gl.bindTexture(gl.TEXTURE_2D, texture);

     

       54
       54
       +
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

     

       55
       55
       +
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);

     

       56
       56
       +
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);

     

       57
       57
       +
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

     

       58
       58
       +
       

     

       59
       59
       +
         let width = init.width;

     

       60
       60
       +
         let height = init.height;

     

       61
       61
       +
       

     

       62
       62
       +
         let vertexPos: GLint = 0;

     

       63
       63
       +
         let iResolution: WebGLUniformLocation | null = null;

     

       64
       64
       +
         let iChannelResolution: WebGLUniformLocation | null = null;

     

       65
       65
       +
         let iTime: WebGLUniformLocation | null = null;

     

       66
       66
       +
         let iTimeDelta: WebGLUniformLocation | null = null;

     

       67
       67
       +
         let iFrame: WebGLUniformLocation | null = null;

     

       68
       68
       +
         let iChannel: WebGLUniformLocation | null = null;

     

       69
       69
       +
         let iDate: WebGLUniformLocation | null = null;

     

       70
       70
       +
       

     

       71
       71
       +
         let frameCount = 0;

     

       72
       72
       +
         let prevTimestamp: DOMHighResTimeStamp;

     

       73
       73
       +
       

     

       74
       74
       +
         const state = {

     

       75
       75
       +
           draw(source: TexImageSource, timestamp: DOMHighResTimeStamp) {

     

       76
       76
       +
             prevTimestamp = timestamp;

     

       77
       77
       +
       

     

       78
       78
       +
             gl.useProgram(program);

     

       79
       79
       +
       

     

       80
       80
       +
             if (source) {

     

       81
       81
       +
               gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, source);

     

       82
       82
       +
               if (iChannelResolution)

     

       83
       83
       +
                 gl.uniform3fv(iChannelResolution, [width, height, 0]);

     

       84
       84
       +
             } else {

     

       85
       85
       +
               if (iChannelResolution)

     

       86
       86
       +
                 gl.uniform3fv(iChannelResolution, [0, 0, 0]);

     

       87
       87
       +
             }

     

       88
       88
       +
       

     

       89
       89
       +
             if (iResolution)

     

       90
       90
       +
               gl.uniform2f(iResolution, width, height);

     

       91
       91
       +
             if (iTime)

     

       92
       92
       +
               gl.uniform1f(iTime, timestamp / 1000);

     

       93
       93
       +
             if (iTimeDelta)

     

       94
       94
       +
               gl.uniform1f(iTime, (timestamp - prevTimestamp) / 1000);

     

       95
       95
       +
             if (iFrame)

     

       96
       96
       +
               gl.uniform1f(iFrame, frameCount++);

     

       97
       97
       +
             if (iChannel)

     

       98
       98
       +
               gl.uniform1i(iChannel, 0);

     

       99
       99
       +
             if (iDate)

     

       100
       100
       +
               gl.uniform4f(iDate, ...makeDateVector());

     

       101
       101
       +
       

     

       102
       102
       +
             gl.enableVertexAttribArray(vertexPos);

     

       103
       103
       +
             gl.vertexAttribPointer(vertexPos, 2, gl.FLOAT, false, 0, 0);

     

       104
       104
       +
             gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);

     

       105
       105
       +
           },

     

       106
       106
       +
       

     

       107
       107
       +
           updateViewport(newWidth: number, newHeight: number) {

     

       108
       108
       +
             gl.canvas.width = (width = newWidth);

     

       109
       109
       +
             gl.canvas.height = (height = newHeight);

     

       110
       110
       +
             gl.viewport(0, 0, width, height);

     

       111
       111
       +
           },

     

       112
       112
       +
       

     

       113
       113
       +
           updateFragShader(fragSource: string) {

     

       114
       114
       +
             fragSource = fragSource.trim();

     

       115
       115
       +
             gl.shaderSource(fragShader, fragSource);

     

       116
       116
       +
             gl.compileShader(fragShader);

     

       117
       117
       +
       

     

       118
       118
       +
             const vertShader = /\s+#version 300/i.test(fragSource) ? vertShader300 : vertShader100;

     

       119
       119
       +
             gl.attachShader(program, vertShader);

     

       120
       120
       +
             gl.attachShader(program, fragShader);

     

       121
       121
       +
       

     

       122
       122
       +
             gl.linkProgram(program);

     

       123
       123
       +
       

     

       124
       124
       +
             vertexPos = gl.getAttribLocation(program, 'vPos');

     

       125
       125
       +
             iResolution = gl.getUniformLocation(program, 'iResolution');

     

       126
       126
       +
             iChannelResolution = gl.getUniformLocation(program, 'iChannelResolution');

     

       127
       127
       +
             iTime = gl.getUniformLocation(program, 'iTime');

     

       128
       128
       +
             iTimeDelta = gl.getUniformLocation(program, 'iTimeDelta');

     

       129
       129
       +
             iFrame = gl.getUniformLocation(program, 'iFrame');

     

       130
       130
       +
             iChannel = gl.getUniformLocation(program, 'iChannel');

     

       131
       131
       +
             iDate = gl.getUniformLocation(program, 'iDate');

     

       132
       132
       +
           },

     

       133
       133
       +
       

     

       134
       134
       +
           drawImmediate() {

     

       135
       135
       +
             gl.useProgram(program);

     

       136
       136
       +
             gl.enableVertexAttribArray(vertexPos);

     

       137
       137
       +
             gl.vertexAttribPointer(vertexPos, 2, gl.FLOAT, false, 0, 0);

     

       138
       138
       +
             gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);

     

       139
       139
       +
           },

     

       140
       140
       +
         };

     

       141
       141
       +
       

     

       142
       142
       +
         state.updateViewport(width, height);

     

       143
       143
       +
         state.updateFragShader(init.fragSource);

     

       144
       144
       +
         return state;

     

       145
       145
       +
       }

     

       146
       146
       +
       

     

       147
       147
       +
       class FragCanvas extends HTMLElement implements HTMLCanvasElement {

     

       148
       148
       +
         static observedAttributes = [];

     

       149
       149
       +
       

     

       150
       150
       +
         private state: ReturnType<typeof createState> | null;

     

       151
       151
       +
         private input: HTMLCanvasElement | HTMLImageElement | HTMLVideoElement;

     

       152
       152
       +
         private output: HTMLCanvasElement;

     

       153
       153
       +
       

     

       154
       154
       +
         #mutationObserver = new MutationObserver(() => {

     

       155
       155
       +
           if (this.state) {

     

       156
       156
       +
             this.state.updateFragShader(this.source);

     

       157
       157
       +
           }

     

       158
       158
       +
         });

     

       159
       159
       +
       

     

       160
       160
       +
         #resizeObserver = new ResizeObserver((entries) => {

     

       161
       161
       +
           const entry = entries[0];

     

       162
       162
       +
           if (this.state && entry) {

     

       163
       163
       +
             const width = entry.devicePixelContentBoxSize[0].inlineSize;

     

       164
       164
       +
             const height = entry.devicePixelContentBoxSize[0].blockSize;

     

       165
       165
       +
             if (this.autoresize) {

     

       166
       166
       +
               this.input.width = width;

     

       167
       167
       +
               this.input.height = height;

     

       168
       168
       +
             }

     

       169
       169
       +
             this.state.updateViewport(width, height);

     

       170
       170
       +
             this.state.drawImmediate();

     

       171
       171
       +
             this.#rescheduleDraw();

     

       172
       172
       +
           }

     

       173
       173
       +
         });

     

       174
       174
       +
       

     

       175
       175
       +
         constructor() {

     

       176
       176
       +
           super();

     

       177
       177
       +
       

     

       178
       178
       +
           const sheet = new CSSStyleSheet();

     

       179
       179
       +
           sheet.insertRule(':host([hidden]) { display: none; }');

     

       180
       180
       +
           sheet.insertRule(':host { display: block; position: relative; }');

     

       181
       181
       +
           sheet.insertRule(':host * { position: absolute; width: 100%; height: 100%; }');

     

       182
       182
       +
           sheet.insertRule(':host *:not(:last-child) { visibility: hidden; }');

     

       183
       183
       +
       

     

       184
       184
       +
           const shadow = this.attachShadow({ mode: 'closed' });

     

       185
       185
       +
           const output = (this.output = document.createElement('canvas'));

     

       186
       186
       +
           const input = (this.input = (this.querySelector(':not(canvas, script)') || document.createElement('canvas')));

     

       187
       187
       +
       

     

       188
       188
       +
           shadow.adoptedStyleSheets = [sheet];

     

       189
       189
       +
           shadow.appendChild(input);

     

       190
       190
       +
           shadow.appendChild(output);

     

       191
       191
       +
         }

     

       192
       192
       +
       

     

       193
       193
       +
         getContext(contextId: '2d', options?: CanvasRenderingContext2DSettings): CanvasRenderingContext2D | null;

     

       194
       194
       +
         getContext(contextId: 'bitmaprenderer', options?: ImageBitmapRenderingContextSettings): ImageBitmapRenderingContext | null;

     

       195
       195
       +
         getContext(contextId: 'webgl', options?: WebGLContextAttributes): WebGLRenderingContext | null;

     

       196
       196
       +
         getContext(contextId: 'webgl2', options?: WebGLContextAttributes): WebGL2RenderingContext | null;

     

       197
       197
       +
       

     

       198
       198
       +
         getContext(contextId: string, options?: any) {

     

       199
       199
       +
           if (!(this.input instanceof HTMLCanvasElement)) {

     

       200
       200
       +
             return null;

     

       201
       201
       +
           }

     

       202
       202
       +
           this.input.width = this.width;

     

       203
       203
       +
           this.input.height = this.height;

     

       204
       204
       +
           return this.input.getContext(contextId, {

     

       205
       205
       +
             alpha: true,

     

       206
       206
       +
             desynchronized: true,

     

       207
       207
       +
             preserveDrawingBuffer: true,

     

       208
       208
       +
             ...options,

     

       209
       209
       +
           });

     

       210
       210
       +
         }

     

       211
       211
       +
       

     

       212
       212
       +
         toBlob(callback: BlobCallback, type?: string, quality?: any): void {

     

       213
       213
       +
           return this.output.toBlob(callback, type, quality);

     

       214
       214
       +
         }

     

       215
       215
       +
       

     

       216
       216
       +
         toDataURL(type?: string, quality?: any): string {

     

       217
       217
       +
           return this.output.toDataURL(type, quality);

     

       218
       218
       +
         }

     

       219
       219
       +
       

     

       220
       220
       +
         captureStream(frameRequestRate?: number): MediaStream {

     

       221
       221
       +
           return this.output.captureStream(frameRequestRate);

     

       222
       222
       +
         }

     

       223
       223
       +
       

     

       224
       224
       +
         transferControlToOffscreen(): OffscreenCanvas {

     

       225
       225
       +
           return (this.input instanceof HTMLCanvasElement ? this.input : this.output).transferControlToOffscreen();

     

       226
       226
       +
         }

     

       227
       227
       +
       

     

       228
       228
       +
         get autoresize() {

     

       229
       229
       +
           return this.hasAttribute('autoresize');

     

       230
       230
       +
         }

     

       231
       231
       +
       

     

       232
       232
       +
         set autoresize(autoresize: boolean) {

     

       233
       233
       +
           if (autoresize) {

     

       234
       234
       +
             this.setAttribute('autoresize', '');

     

       235
       235
       +
           } else {

     

       236
       236
       +
             this.removeAttribute('autoresize');

     

       237
       237
       +
           }

     

       238
       238
       +
         }

     

       239
       239
       +
       

     

       240
       240
       +
         get source() {

     

       241
       241
       +
           let text = '';

     

       242
       242
       +
           for (const child of this.childNodes) {

     

       243
       243
       +
             if (child.nodeType === Node.TEXT_NODE) {

     

       244
       244
       +
               text += child.textContent || '';

     

       245
       245
       +
             } else if (child instanceof HTMLScriptElement) {

     

       246
       246
       +
               text = child.textContent || '';

     

       247
       247
       +
               break;

     

       248
       248
       +
             }

     

       249
       249
       +
           }

     

       250
       250
       +
           return text.trim();

     

       251
       251
       +
         }

     

       252
       252
       +
       

     

       253
       253
       +
         get width() {

     

       254
       254
       +
           if (this.state) {

     

       255
       255
       +
             return this.output.width;

     

       256
       256
       +
           } else {

     

       257
       257
       +
             return this.clientWidth * devicePixelRatio;

     

       258
       258
       +
           }

     

       259
       259
       +
         }

     

       260
       260
       +
       

     

       261
       261
       +
         set width(width) {

     

       262
       262
       +
           this.input.width = width;

     

       263
       263
       +
         }

     

       264
       264
       +
       

     

       265
       265
       +
         get height() {

     

       266
       266
       +
           if (this.state) {

     

       267
       267
       +
             return this.output.height;

     

       268
       268
       +
           } else {

     

       269
       269
       +
             return this.clientHeight * devicePixelRatio;

     

       270
       270
       +
           }

     

       271
       271
       +
         }

     

       272
       272
       +
       

     

       273
       273
       +
         set height(height) {

     

       274
       274
       +
           this.input.height = height;

     

       275
       275
       +
         }

     

       276
       276
       +
       

     

       277
       277
       +
         #frameID: number | undefined;

     

       278
       278
       +
         #rescheduleDraw() {

     

       279
       279
       +
           const self = this;

     

       280
       280
       +
           if (this.#frameID !== undefined) {

     

       281
       281
       +
             cancelAnimationFrame(this.#frameID);

     

       282
       282
       +
             this.#frameID = undefined;

     

       283
       283
       +
           }

     

       284
       284
       +
           this.#frameID = requestAnimationFrame(function draw(timestamp: DOMHighResTimeStamp) {

     

       285
       285
       +
             if (self.state) {

     

       286
       286
       +
               self.state.draw(self.input, timestamp);

     

       287
       287
       +
               self.#frameID = requestAnimationFrame(draw);

     

       288
       288
       +
             }

     

       289
       289
       +
           });

     

       290
       290
       +
         }

     

       291
       291
       +
       

     

       292
       292
       +
         connectedCallback() {

     

       293
       293
       +
           const gl = this.output.getContext('webgl2', {

     

       294
       294
       +
             alpha: true,

     

       295
       295
       +
             desynchronized: true,

     

       296
       296
       +
             preserveDrawingBuffer: true,

     

       297
       297
       +
           });

     

       298
       298
       +
       

     

       299
       299
       +
           const init = {

     

       300
       300
       +
             fragSource: this.source,

     

       301
       301
       +
             width: this.clientWidth * devicePixelRatio,

     

       302
       302
       +
             height: this.clientHeight * devicePixelRatio,

     

       303
       303
       +
           };

     

       304
       304
       +
       

     

       305
       305
       +
           const state = (this.state = gl && createState(gl, init));

     

       306
       306
       +
           if (state) {

     

       307
       307
       +
             this.#mutationObserver.observe(this, { subtree: true, characterData: true });

     

       308
       308
       +
             this.#resizeObserver.observe(this, { box: 'device-pixel-content-box' });

     

       309
       309
       +
             this.#rescheduleDraw();

     

       310
       310
       +
           }

     

       311
       311
       +
         }

     

       312
       312
       +
       

     

       313
       313
       +
         disconnectedCallback() {

     

       314
       314
       +
           this.#mutationObserver.disconnect();

     

       315
       315
       +
           this.#resizeObserver.disconnect();

     

       316
       316
       +
           if (this.#frameID !== undefined) {

     

       317
       317
       +
             cancelAnimationFrame(this.#frameID);

     

       318
       318
       +
             this.#frameID = undefined;

     

       319
       319
       +
           }

     

       320
       320
       +
         }

     

       321
       321
       +
       }

     

       322
       322
       +
       

     

       323
       323
       +
       customElements.define('frag-canvas', FragCanvas);

     

       324
       324
       +
       export { FragCanvas };

src/index.ts

···

       1
       1
       +
       export * from './frag-canvas-element';