The Tor Browser: browser/devtools/shadereditor/test/doc

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 <!-- Any copyright is dedicated to the Public Domain.

     2      http://creativecommons.org/publicdomain/zero/1.0/ -->

     3 <!doctype html>

     5 <html>

     6   <head>

     7     <meta charset="utf-8"/>

     8     <title>WebGL editor test page</title>

    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;

    16       void main(void) {

    17         gl_Position = vec4(aVertexPosition, 1.0);

    18         vFragmentColor = aVertexColor; // I'm special!

    19       }

    20     </script>

    22     <script id="shader-fs" type="x-shader/x-fragment">

    23       precision lowp float;

    24       varying vec3 vFragmentColor;

    26       void main(void) {

    27         gl_FragColor = vec4(vFragmentColor, 1.0); // I'm also special!

    28       }

    29     </script>

    30   </head>

    32   <body>

    33     <canvas width="512" height="512"></canvas>

    35     <script type="text/javascript;version=1.8">

    36       "use strict";

    38       let canvas, gl;

    39       let program;

    40       let squareVerticesPositionBuffer;

    41       let squareVerticesColorBuffer;

    42       let vertexPositionAttribute;

    43       let vertexColorAttribute;

    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);

    50         initProgram();

    51         initBuffers();

    52         drawScene();

    53       }

    55       function initProgram() {

    56         let vertexShader = getShader(gl, "shader-vs");

    57         let fragmentShader = getShader(gl, "shader-fs");

    59         program = gl.createProgram();

    60         gl.attachShader(program, vertexShader);

    61         gl.attachShader(program, fragmentShader);

    62         gl.linkProgram(program);

    64         vertexPositionAttribute = gl.getAttribLocation(program, "aVertexPosition");

    65         gl.enableVertexAttribArray(vertexPositionAttribute);

    67         vertexColorAttribute = gl.getAttribLocation(program, "aVertexColor");

    68         gl.enableVertexAttribArray(vertexColorAttribute);

    69       }

    71       function getShader(gl, id) {

    72         let script = document.getElementById(id);

    73         let source = script.textContent;

    74         let shader;

    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         }

    82         gl.shaderSource(shader, source);

    83         gl.compileShader(shader);

    85         return shader;

    86       }

    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);

    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       }

   108       function drawScene() {

   109         gl.clear(gl.COLOR_BUFFER_BIT);

   111         gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesPositionBuffer);

   112         gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0);

   114         gl.bindBuffer(gl.ARRAY_BUFFER, squareVerticesColorBuffer);

   115         gl.vertexAttribPointer(vertexColorAttribute, 4, gl.FLOAT, false, 0, 0);

   117         gl.useProgram(program);

   118         gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);

   120         window.requestAnimationFrame(drawScene);

   121       }

   122     </script>

   123   </body>

   125 </html>

The Tor Browser / file revision