The Tor Browser / file comparison
comparison: browser/devtools/shadereditor/test/doc_simple-canvas.html
browser/devtools/shadereditor/test/doc_simple-canvas.html
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
equal
deleted
inserted
replaced
| -1:000000000000 | 0:58494fd645fa |
|---|---|
| 1 <!-- Any copyright is dedicated to the Public Domain. | |
| 2 http://creativecommons.org/publicdomain/zero/1.0/ --> | |
| 3 <!doctype html> | |
| 4 | |
| 5 <html> | |
| 6 <head> | |
| 7 <meta charset="utf-8"/> | |
| 8 <title>WebGL editor test page</title> | |
| 9 | |
| 10 <script id="shader-vs" type="x-shader/x-vertex"> | |
| 11 precision lowp float; | |
| 12 attribute vec3 aVertexPosition; | |
| 13 attribute vec3 aVertexColor; | |
| 14 varying vec3 vFragmentColor; | |
| 15 | |
| 16 void main(void) { | |
| 17 gl_Position = vec4(aVertexPosition, 1.0); | |
| 18 vFragmentColor = aVertexColor; // I'm special! | |
| 19 } | |
| 20 </script> | |
| 21 | |
| 22 <script id="shader-fs" type="x-shader/x-fragment"> | |
| 23 precision lowp float; | |
| 24 varying vec3 vFragmentColor; | |
| 25 | |
| 26 void main(void) { | |
| 27 gl_FragColor = vec4(vFragmentColor, 1.0); // I'm also special! | |
| 28 } | |
| 29 </script> | |
| 30 </head> | |
| 31 | |
| 32 <body> | |
| 33 <canvas width="512" height="512"></canvas> | |
| 34 | |
| 35 <script type="text/javascript;version=1.8"> | |
| 36 "use strict"; | |
| 37 | |
| 38 let canvas, gl; | |
| 39 let program; | |
| 40 let squareVerticesPositionBuffer; | |
| 41 let squareVerticesColorBuffer; | |
| 42 let vertexPositionAttribute; | |
| 43 let vertexColorAttribute; | |
| 44 | |
| 45 window.onload = function() { | |
| 46 canvas = document.querySelector("canvas"); | |
| 47 gl = canvas.getContext("webgl", { preserveDrawingBuffer: true }); | |
| 48 gl.clearColor(0.0, 0.0, 0.0, 1.0); | |
| 49 | |
| 50 initProgram(); | |
| 51 initBuffers(); | |
| 52 drawScene(); | |
| 53 } | |
| 54 | |
| 55 function initProgram() { | |
| 56 let vertexShader = getShader(gl, "shader-vs"); | |
| 57 let fragmentShader = getShader(gl, "shader-fs"); | |
| 58 | |
| 59 program = gl.createProgram(); | |
| 60 gl.attachShader(program, vertexShader); | |
| 61 gl.attachShader(program, fragmentShader); | |
| 62 gl.linkProgram(program); | |
| 63 | |
| 64 vertexPositionAttribute = gl.getAttribLocation(program, "aVertexPosition"); | |
| 65 gl.enableVertexAttribArray(vertexPositionAttribute); | |
| 66 | |
| 67 vertexColorAttribute = gl.getAttribLocation(program, "aVertexColor"); | |
| 68 gl.enableVertexAttribArray(vertexColorAttribute); | |
| 69 } | |
| 70 | |
| 71 function getShader(gl, id) { | |
| 72 let script = document.getElementById(id); | |
| 73 let source = script.textContent; | |
| 74 let shader; | |
| 75 | |
| 76 if (script.type == "x-shader/x-fragment") { | |
| 77 shader = gl.createShader(gl.FRAGMENT_SHADER); | |
| 78 } else if (script.type == "x-shader/x-vertex") { | |
| 79 shader = gl.createShader(gl.VERTEX_SHADER); | |
| 80 } | |
| 81 | |
| 82 gl.shaderSource(shader, source); | |
| 83 gl.compileShader(shader); | |
| 84 | |
| 85 return shader; | |
| 86 } | |
| 87 | |
| 88 function initBuffers() { | |
| 89 squareVerticesPositionBuffer = gl.createBuffer(); | |
| 90 gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesPositionBuffer); | |
| 91 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ | |
| 92 1.0, 1.0, 0.0, | |
| 93 -1.0, 1.0, 0.0, | |
| 94 1.0, -1.0, 0.0, | |
| 95 -1.0, -1.0, 0.0 | |
| 96 ]), gl.STATIC_DRAW); | |
| 97 | |
| 98 squareVerticesColorBuffer = gl.createBuffer(); | |
| 99 gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesColorBuffer); | |
| 100 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ | |
| 101 1.0, 1.0, 1.0, 1.0, | |
| 102 1.0, 0.0, 0.0, 1.0, | |
| 103 0.0, 1.0, 0.0, 1.0, | |
| 104 0.0, 0.0, 1.0, 1.0 | |
| 105 ]), gl.STATIC_DRAW); | |
| 106 } | |
| 107 | |
| 108 function drawScene() { | |
| 109 gl.clear(gl.COLOR_BUFFER_BIT); | |
| 110 | |
| 111 gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesPositionBuffer); | |
| 112 gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0); | |
| 113 | |
| 114 gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesColorBuffer); | |
| 115 gl.vertexAttribPointer(vertexColorAttribute, 4, gl.FLOAT, false, 0, 0); | |
| 116 | |
| 117 gl.useProgram(program); | |
| 118 gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); | |
| 119 | |
| 120 window.requestAnimationFrame(drawScene); | |
| 121 } | |
| 122 </script> | |
| 123 </body> | |
| 124 | |
| 125 </html> |
