webgpu_compute_texture_pingpong.html 6.0 KB

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  1. <html lang="en">
  2. <head>
  3. <title>three.js - WebGPU - Compute Ping/Pong Texture</title>
  4. <meta charset="utf-8">
  5. <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
  6. <link type="text/css" rel="stylesheet" href="main.css">
  7. </head>
  8. <body>
  9. <div id="info">
  10. <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> WebGPU - Compute Ping/Pong Texture
  11. </div>
  12. <script type="importmap">
  13. {
  14. "imports": {
  15. "three": "../build/three.module.js",
  16. "three/addons/": "./jsm/",
  17. "three/nodes": "./jsm/nodes/Nodes.js"
  18. }
  19. }
  20. </script>
  21. <script type="module">
  22. import * as THREE from 'three';
  23. import { storageTexture, wgslFn, code, instanceIndex, uniform } from 'three/nodes';
  24. import WebGPU from 'three/addons/capabilities/WebGPU.js';
  25. import WebGPURenderer from 'three/addons/renderers/webgpu/WebGPURenderer.js';
  26. import StorageTexture from 'three/addons/renderers/common/StorageTexture.js';
  27. let camera, scene, renderer;
  28. let computeInitNode, computeToPing, computeToPong;
  29. let pingTexture, pongTexture;
  30. let material;
  31. let phase = true;
  32. let lastUpdate = - 1;
  33. const seed = uniform( new THREE.Vector2() );
  34. init();
  35. function init() {
  36. if ( WebGPU.isAvailable() === false ) {
  37. document.body.appendChild( WebGPU.getErrorMessage() );
  38. throw new Error( 'No WebGPU support' );
  39. }
  40. const aspect = window.innerWidth / window.innerHeight;
  41. camera = new THREE.OrthographicCamera( - aspect, aspect, 1, - 1, 0, 2 );
  42. camera.position.z = 1;
  43. scene = new THREE.Scene();
  44. // texture
  45. const hdr = true;
  46. const width = 512, height = 512;
  47. pingTexture = new StorageTexture( width, height );
  48. pongTexture = new StorageTexture( width, height );
  49. if ( hdr ) {
  50. pingTexture.type = THREE.HalfFloatType;
  51. pongTexture.type = THREE.HalfFloatType;
  52. }
  53. const wgslFormat = hdr ? 'rgba16float' : 'rgba8unorm';
  54. const readPing = storageTexture( pingTexture ).setAccess( 'read-only' );
  55. const writePing = storageTexture( pingTexture ).setAccess( 'write-only' );
  56. const readPong = storageTexture( pongTexture ).setAccess( 'read-only' );
  57. const writePong = storageTexture( pongTexture ).setAccess( 'write-only' );
  58. // compute init
  59. const rand2 = code( `
  60. fn rand2( n: vec2f ) -> f32 {
  61. return fract( sin( dot( n, vec2f( 12.9898, 4.1414 ) ) ) * 43758.5453 );
  62. }
  63. fn blur( image : texture_storage_2d<${wgslFormat}, read>, uv : vec2i ) -> vec4f {
  64. var color = vec4f( 0.0 );
  65. color += textureLoad( image, uv + vec2i( - 1, 1 ));
  66. color += textureLoad( image, uv + vec2i( - 1, - 1 ));
  67. color += textureLoad( image, uv + vec2i( 0, 0 ));
  68. color += textureLoad( image, uv + vec2i( 1, - 1 ));
  69. color += textureLoad( image, uv + vec2i( 1, 1 ));
  70. return color / 5.0;
  71. }
  72. fn getUV( posX: u32, posY: u32 ) -> vec2f {
  73. let uv = vec2f( f32( posX ) / ${ width }.0, f32( posY ) / ${ height }.0 );
  74. return uv;
  75. }
  76. ` );
  77. const computeInitWGSL = wgslFn( `
  78. fn computeInitWGSL( writeTex: texture_storage_2d<${ wgslFormat }, write>, index: u32, seed: vec2f ) -> void {
  79. let posX = index % ${ width };
  80. let posY = index / ${ width };
  81. let indexUV = vec2u( posX, posY );
  82. let uv = getUV( posX, posY );
  83. let r = rand2( uv + seed * 100 ) - rand2( uv + seed * 300 );
  84. let g = rand2( uv + seed * 200 ) - rand2( uv + seed * 300 );
  85. let b = rand2( uv + seed * 200 ) - rand2( uv + seed * 100 );
  86. textureStore( writeTex, indexUV, vec4( r, g, b, 1 ) );
  87. }
  88. `, [ rand2 ] );
  89. computeInitNode = computeInitWGSL( { writeTex: storageTexture( pingTexture ), index: instanceIndex, seed } ).compute( width * height );
  90. // compute loop
  91. const computePingPongWGSL = wgslFn( `
  92. fn computePingPongWGSL( readTex: texture_storage_2d<${wgslFormat}, read>, writeTex: texture_storage_2d<${ wgslFormat }, write>, index: u32 ) -> void {
  93. let posX = index % ${ width };
  94. let posY = index / ${ width };
  95. let indexUV = vec2i( i32( posX ), i32( posY ) );
  96. let color = blur( readTex, indexUV ).rgb;
  97. textureStore( writeTex, indexUV, vec4f( color * 1.05, 1 ) );
  98. }
  99. `, [ rand2 ] );
  100. //
  101. computeToPong = computePingPongWGSL( { readTex: readPing, writeTex: writePong, index: instanceIndex } ).compute( width * height );
  102. computeToPing = computePingPongWGSL( { readTex: readPong, writeTex: writePing, index: instanceIndex } ).compute( width * height );
  103. //
  104. material = new THREE.MeshBasicMaterial( { color: 0xffffff, map: pongTexture } );
  105. const plane = new THREE.Mesh( new THREE.PlaneGeometry( 1, 1 ), material );
  106. scene.add( plane );
  107. renderer = new WebGPURenderer( { antialias: true } );
  108. renderer.setPixelRatio( window.devicePixelRatio );
  109. renderer.setSize( window.innerWidth, window.innerHeight );
  110. renderer.setAnimationLoop( render );
  111. document.body.appendChild( renderer.domElement );
  112. window.addEventListener( 'resize', onWindowResize );
  113. // compute init
  114. renderer.computeAsync( computeInitNode );
  115. }
  116. function onWindowResize() {
  117. renderer.setSize( window.innerWidth, window.innerHeight );
  118. const aspect = window.innerWidth / window.innerHeight;
  119. const frustumHeight = camera.top - camera.bottom;
  120. camera.left = - frustumHeight * aspect / 2;
  121. camera.right = frustumHeight * aspect / 2;
  122. camera.updateProjectionMatrix();
  123. }
  124. function render() {
  125. const time = performance.now();
  126. const seconds = Math.floor( time / 1000 );
  127. // reset every second
  128. if ( phase && seconds !== lastUpdate ) {
  129. seed.value.set( Math.random(), Math.random() );
  130. renderer.compute( computeInitNode );
  131. lastUpdate = seconds;
  132. }
  133. // compute step
  134. renderer.compute( phase ? computeToPong : computeToPing );
  135. material.map = phase ? pongTexture : pingTexture;
  136. phase = ! phase;
  137. // render step
  138. // update material texture node
  139. renderer.render( scene, camera );
  140. }
  141. </script>
  142. </body>
  143. </html>