browser/devtools/shadereditor/test/doc_simple-canvas.html@6474c204b198 (annotated)
browser/devtools/shadereditor/test/doc_simple-canvas.html
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | <!-- Any copyright is dedicated to the Public Domain. |
| michael@0 | 2 | http://creativecommons.org/publicdomain/zero/1.0/ --> |
| michael@0 | 3 | <!doctype html> |
| michael@0 | 4 | |
| michael@0 | 5 | <html> |
| michael@0 | 6 | <head> |
| michael@0 | 7 | <meta charset="utf-8"/> |
| michael@0 | 8 | <title>WebGL editor test page</title> |
| michael@0 | 9 | |
| michael@0 | 10 | <script id="shader-vs" type="x-shader/x-vertex"> |
| michael@0 | 11 | precision lowp float; |
| michael@0 | 12 | attribute vec3 aVertexPosition; |
| michael@0 | 13 | attribute vec3 aVertexColor; |
| michael@0 | 14 | varying vec3 vFragmentColor; |
| michael@0 | 15 | |
| michael@0 | 16 | void main(void) { |
| michael@0 | 17 | gl_Position = vec4(aVertexPosition, 1.0); |
| michael@0 | 18 | vFragmentColor = aVertexColor; // I'm special! |
| michael@0 | 19 | } |
| michael@0 | 20 | </script> |
| michael@0 | 21 | |
| michael@0 | 22 | <script id="shader-fs" type="x-shader/x-fragment"> |
| michael@0 | 23 | precision lowp float; |
| michael@0 | 24 | varying vec3 vFragmentColor; |
| michael@0 | 25 | |
| michael@0 | 26 | void main(void) { |
| michael@0 | 27 | gl_FragColor = vec4(vFragmentColor, 1.0); // I'm also special! |
| michael@0 | 28 | } |
| michael@0 | 29 | </script> |
| michael@0 | 30 | </head> |
| michael@0 | 31 | |
| michael@0 | 32 | <body> |
| michael@0 | 33 | <canvas width="512" height="512"></canvas> |
| michael@0 | 34 | |
| michael@0 | 35 | <script type="text/javascript;version=1.8"> |
| michael@0 | 36 | "use strict"; |
| michael@0 | 37 | |
| michael@0 | 38 | let canvas, gl; |
| michael@0 | 39 | let program; |
| michael@0 | 40 | let squareVerticesPositionBuffer; |
| michael@0 | 41 | let squareVerticesColorBuffer; |
| michael@0 | 42 | let vertexPositionAttribute; |
| michael@0 | 43 | let vertexColorAttribute; |
| michael@0 | 44 | |
| michael@0 | 45 | window.onload = function() { |
| michael@0 | 46 | canvas = document.querySelector("canvas"); |
| michael@0 | 47 | gl = canvas.getContext("webgl", { preserveDrawingBuffer: true }); |
| michael@0 | 48 | gl.clearColor(0.0, 0.0, 0.0, 1.0); |
| michael@0 | 49 | |
| michael@0 | 50 | initProgram(); |
| michael@0 | 51 | initBuffers(); |
| michael@0 | 52 | drawScene(); |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | function initProgram() { |
| michael@0 | 56 | let vertexShader = getShader(gl, "shader-vs"); |
| michael@0 | 57 | let fragmentShader = getShader(gl, "shader-fs"); |
| michael@0 | 58 | |
| michael@0 | 59 | program = gl.createProgram(); |
| michael@0 | 60 | gl.attachShader(program, vertexShader); |
| michael@0 | 61 | gl.attachShader(program, fragmentShader); |
| michael@0 | 62 | gl.linkProgram(program); |
| michael@0 | 63 | |
| michael@0 | 64 | vertexPositionAttribute = gl.getAttribLocation(program, "aVertexPosition"); |
| michael@0 | 65 | gl.enableVertexAttribArray(vertexPositionAttribute); |
| michael@0 | 66 | |
| michael@0 | 67 | vertexColorAttribute = gl.getAttribLocation(program, "aVertexColor"); |
| michael@0 | 68 | gl.enableVertexAttribArray(vertexColorAttribute); |
| michael@0 | 69 | } |
| michael@0 | 70 | |
| michael@0 | 71 | function getShader(gl, id) { |
| michael@0 | 72 | let script = document.getElementById(id); |
| michael@0 | 73 | let source = script.textContent; |
| michael@0 | 74 | let shader; |
| michael@0 | 75 | |
| michael@0 | 76 | if (script.type == "x-shader/x-fragment") { |
| michael@0 | 77 | shader = gl.createShader(gl.FRAGMENT_SHADER); |
| michael@0 | 78 | } else if (script.type == "x-shader/x-vertex") { |
| michael@0 | 79 | shader = gl.createShader(gl.VERTEX_SHADER); |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | gl.shaderSource(shader, source); |
| michael@0 | 83 | gl.compileShader(shader); |
| michael@0 | 84 | |
| michael@0 | 85 | return shader; |
| michael@0 | 86 | } |
| michael@0 | 87 | |
| michael@0 | 88 | function initBuffers() { |
| michael@0 | 89 | squareVerticesPositionBuffer = gl.createBuffer(); |
| michael@0 | 90 | gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesPositionBuffer); |
| michael@0 | 91 | gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
| michael@0 | 92 | 1.0, 1.0, 0.0, |
| michael@0 | 93 | -1.0, 1.0, 0.0, |
| michael@0 | 94 | 1.0, -1.0, 0.0, |
| michael@0 | 95 | -1.0, -1.0, 0.0 |
| michael@0 | 96 | ]), gl.STATIC_DRAW); |
| michael@0 | 97 | |
| michael@0 | 98 | squareVerticesColorBuffer = gl.createBuffer(); |
| michael@0 | 99 | gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesColorBuffer); |
| michael@0 | 100 | gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
| michael@0 | 101 | 1.0, 1.0, 1.0, 1.0, |
| michael@0 | 102 | 1.0, 0.0, 0.0, 1.0, |
| michael@0 | 103 | 0.0, 1.0, 0.0, 1.0, |
| michael@0 | 104 | 0.0, 0.0, 1.0, 1.0 |
| michael@0 | 105 | ]), gl.STATIC_DRAW); |
| michael@0 | 106 | } |
| michael@0 | 107 | |
| michael@0 | 108 | function drawScene() { |
| michael@0 | 109 | gl.clear(gl.COLOR_BUFFER_BIT); |
| michael@0 | 110 | |
| michael@0 | 111 | gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesPositionBuffer); |
| michael@0 | 112 | gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0); |
| michael@0 | 113 | |
| michael@0 | 114 | gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesColorBuffer); |
| michael@0 | 115 | gl.vertexAttribPointer(vertexColorAttribute, 4, gl.FLOAT, false, 0, 0); |
| michael@0 | 116 | |
| michael@0 | 117 | gl.useProgram(program); |
| michael@0 | 118 | gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); |
| michael@0 | 119 | |
| michael@0 | 120 | window.requestAnimationFrame(drawScene); |
| michael@0 | 121 | } |
| michael@0 | 122 | </script> |
| michael@0 | 123 | </body> |
| michael@0 | 124 | |
| michael@0 | 125 | </html> |
