The Tor Browser / file comparison
comparison: browser/devtools/shadereditor/test/doc_multiple-contexts.html
browser/devtools/shadereditor/test/doc_multiple-contexts.html
- branch
- TOR_BUG_3246
- changeset 5
- 4ab42b5ab56c
equal
deleted
inserted
replaced
| -1:000000000000 | 0:a358259a320e |
|---|---|
| 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 | |
| 14 void main(void) { | |
| 15 gl_Position = vec4(aVertexPosition, 1); | |
| 16 } | |
| 17 </script> | |
| 18 | |
| 19 <script id="shader-fs" type="x-shader/x-fragment"> | |
| 20 precision lowp float; | |
| 21 uniform vec3 uColor; | |
| 22 | |
| 23 void main(void) { | |
| 24 gl_FragColor = vec4(uColor, 1); | |
| 25 } | |
| 26 </script> | |
| 27 </head> | |
| 28 | |
| 29 <body> | |
| 30 <canvas id="canvas1" width="128" height="128"></canvas> | |
| 31 <canvas id="canvas2" width="128" height="128"></canvas> | |
| 32 | |
| 33 <script type="text/javascript;version=1.8"> | |
| 34 "use strict"; | |
| 35 | |
| 36 let canvas = [], gl = []; | |
| 37 let program = []; | |
| 38 let squareVerticesPositionBuffer = []; | |
| 39 let vertexPositionAttribute = []; | |
| 40 let colorUniform = []; | |
| 41 | |
| 42 window.onload = function() { | |
| 43 for (let i = 0; i < 2; i++) { | |
| 44 canvas[i] = document.querySelector("#canvas" + (i + 1)); | |
| 45 gl[i] = canvas[i].getContext("webgl", { preserveDrawingBuffer: true }); | |
| 46 gl[i].clearColor(0.0, 0.0, 0.0, 1.0); | |
| 47 | |
| 48 initProgram(i); | |
| 49 initBuffers(i); | |
| 50 drawScene(i); | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 function initProgram(i) { | |
| 55 let vertexShader = getShader(gl[i], "shader-vs"); | |
| 56 let fragmentShader = getShader(gl[i], "shader-fs"); | |
| 57 | |
| 58 program[i] = gl[i].createProgram(); | |
| 59 gl[i].attachShader(program[i], vertexShader); | |
| 60 gl[i].attachShader(program[i], fragmentShader); | |
| 61 gl[i].linkProgram(program[i]); | |
| 62 | |
| 63 vertexPositionAttribute[i] = gl[i].getAttribLocation(program[i], "aVertexPosition"); | |
| 64 gl[i].enableVertexAttribArray(vertexPositionAttribute[i]); | |
| 65 | |
| 66 colorUniform[i] = gl[i].getUniformLocation(program[i], "uColor"); | |
| 67 } | |
| 68 | |
| 69 function getShader(gl, id) { | |
| 70 let script = document.getElementById(id); | |
| 71 let source = script.textContent; | |
| 72 let shader; | |
| 73 | |
| 74 if (script.type == "x-shader/x-fragment") { | |
| 75 shader = gl.createShader(gl.FRAGMENT_SHADER); | |
| 76 } else if (script.type == "x-shader/x-vertex") { | |
| 77 shader = gl.createShader(gl.VERTEX_SHADER); | |
| 78 } | |
| 79 | |
| 80 gl.shaderSource(shader, source); | |
| 81 gl.compileShader(shader); | |
| 82 | |
| 83 return shader; | |
| 84 } | |
| 85 | |
| 86 function initBuffers(i) { | |
| 87 squareVerticesPositionBuffer[i] = gl[i].createBuffer(); | |
| 88 gl[i].bindBuffer(gl[i].ARRAY_BUFFER, squareVerticesPositionBuffer[i]); | |
| 89 gl[i].bufferData(gl[i].ARRAY_BUFFER, new Float32Array([ | |
| 90 1.0, 1.0, 0.0, | |
| 91 -1.0, 1.0, 0.0, | |
| 92 1.0, -1.0, 0.0, | |
| 93 -1.0, -1.0, 0.0 | |
| 94 ]), gl[i].STATIC_DRAW); | |
| 95 } | |
| 96 | |
| 97 function drawScene(i) { | |
| 98 gl[i].clear(gl[i].COLOR_BUFFER_BIT); | |
| 99 | |
| 100 gl[i].bindBuffer(gl[i].ARRAY_BUFFER, squareVerticesPositionBuffer[i]); | |
| 101 gl[i].vertexAttribPointer(vertexPositionAttribute[i], 3, gl[i].FLOAT, false, 0, 0); | |
| 102 | |
| 103 gl[i].useProgram(program[i]); | |
| 104 gl[i].uniform3fv(colorUniform[i], i == 0 ? [1, 1, 0] : [0, 1, 1]); | |
| 105 gl[i].drawArrays(gl[i].TRIANGLE_STRIP, 0, 4); | |
| 106 | |
| 107 window.requestAnimationFrame(() => drawScene(i)); | |
| 108 } | |
| 109 </script> | |
| 110 </body> | |
| 111 | |
| 112 </html> |
