The Tor Browser: content/canvas/test/webgl-conformance/extra/slow-shader-example.html@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 <!--

     2 Copyright (c) 2009 The Chromium Authors. All rights reserved.

     3 Use of this source code is governed by a BSD-style license that can be

     4 found in the LICENSE file.

     5  -->

     6 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

     7   "http://www.w3.org/TR/html4/loose.dtd">

     8 <html>

     9 <head>

    10 <meta charset="utf-8">

    11 <title>WebGL Slow Shader example.</title>

    12 <link rel="stylesheet" href="../resources/js-test-style.css"/>

    13 <script src="../resources/js-test-pre.js"></script>

    14 <script src="../conformance/resources/webgl-test-utils.js"> </script>

    15 </head>

    16 <body>

    17 <canvas id="example" width="1024" height="1024" style="width: 40px; height: 40px;">

    18 </canvas>

    19 <div id="description"></div>

    20 <div id="console"></div>

    21 <script id="slow" type="text/something-not-javascript">

    22 precision mediump float;

    23 uniform sampler2D tex;

    24 varying vec2 texCoord;

    25 void main() {

    26   gl_FragColor = texture2D(tex, texture2D(tex, texture2D(tex, texCoord).xy).xy);

    27 }

    28 </script>

    29 <script>

    30 window.onload = main;

    32 debug("Tests drawing a very slow shader.");

    33 var wtu = WebGLTestUtils;

    34 var canvas = document.getElementById("example");

    35 canvas.addEventListener("webglcontextlost", function(e) { e.preventDefault(); }, false);

    36 canvas.addEventListener("webglcontextrestored", function(e) { }, false);

    37 var gl = wtu.create3DContext(canvas);

    38 var maxTexSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);

    39 var texSize = Math.min(maxTexSize, 4096);

    40 debug("Max Texture size: " + maxTexSize);

    41 debug("Texture size: " + texSize);

    42 var shaderSource =

    43     document.getElementById("slow").text.replace(/\$size/g, texSize + ".0");

    44 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after getting a context");

    45 var vs = wtu.setupSimpleTextureVertexShader(gl);

    46 var fs = wtu.loadShader(

    47     gl,

    48     shaderSource,

    49     gl.FRAGMENT_SHADER)

    50 var program = wtu.setupProgram(

    51     gl,

    52     [vs, fs],

    53     ['vPosition', 'texCoord0'],

    54     [0, 1]);

    55 wtu.setupUnitQuad(gl, 0, 1);

    56 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after program setup");

    57 var tex = gl.createTexture();

    58 gl.enable(gl.BLEND);

    59 gl.disable(gl.DEPTH_TEST);

    61 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after creating texture");

    62 debug("preparing...");

    63 var numBytes = texSize * texSize * 4;

    64 var pixelBuf = new ArrayBuffer(numBytes);

    65 var pixels = new Uint8Array(pixelBuf);

    66 for (var ii = 0; ii < numBytes; ++ii) {

    67   pixels[ii] = Math.random() * 255;

    68 }

    69 gl.bindTexture(gl.TEXTURE_2D, tex);

    70 gl.texImage2D(

    71       gl.TEXTURE_2D, 0, gl.RGBA, texSize, texSize, 0,

    72       gl.RGBA, gl.UNSIGNED_BYTE, pixels);

    73 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture setup");

    75 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

    76 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);

    77 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);

    78 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);

    79 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after texture param setting");

    81 var loc = gl.getUniformLocation(program, "tex");

    82 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after getting tex location");

    83 gl.uniform1i(loc, 0);

    84 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting tex uniform");

    86 var numQuads = 1000;

    87 var indexBuf = new ArrayBuffer(numQuads * 6);

    88 var indices = new Uint8Array(indexBuf);

    89 for (var ii = 0; ii < numQuads; ++ii) {

    90   var offset = ii * 6;

    91   indices[offset + 0] = 0;

    92   indices[offset + 1] = 1;

    93   indices[offset + 2] = 2;

    94   indices[offset + 3] = 3;

    95   indices[offset + 4] = 4;

    96   indices[offset + 5] = 5;

    97 }

    98 var indexBuffer = gl.createBuffer();

    99 gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);

   100 gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);

   101 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after setting up indices");

   103 function main () {

   104   if (confirm(

   105       "after clicking ok your machine may be come unresponsive or crash")) {

   106     gl.drawElements(gl.TRIANGLES, numQuads * 6, gl.UNSIGNED_BYTE, 0);

   107     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "after drawing");

   108   } else {

   109     debug("cancelled");

   110   }

   111 }

   113 successfullyParsed = true;

   114 </script>

   115 </body>

   116 </html>

The Tor Browser / file revision