dom/canvas/test/webgl-conf/checkout/extra/point-no-attributes-stress.html

   1 <!--
   2 Copyright (c) 2019 The Khronos Group Inc.
   3 Use of this source code is governed by an MIT-style license that can be
   4 found in the LICENSE.txt file.
   5 -->
   6
   7 <!DOCTYPE html>
   8 <html>
   9 <head>
  10 <meta charset="utf-8">
  11 <link rel="stylesheet" href="../resources/js-test-style.css"/>
  12 <script src="../js/js-test-pre.js"></script>
  13 <script src="../js/webgl-test-utils.js"></script>
  14 <script id="vshader" type="x-shader/x-vertex">
  15 void main()
  16 {
  17     gl_PointSize = 1.0;
  18     gl_Position = vec4(0.0, 0.0, 0.0, 1.0);
  19 }
  20 </script>
  21
  22 <script id="fshader" type="x-shader/x-fragment">
  23 precision mediump float;
  24
  25 void main()
  26 {
  27     gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
  28 }
  29 </script>
  30 </head>
  31 <body>
  32 <canvas id="testbed" width="1" height="1" style="width: 100px; height: 100px;"></canvas>
  33 <div id="description"></div>
  34 <div id="console"></div>
  35 <script>
  36 "use strict";
  37 description('Stress test drawing a huge number of points without enabling any attributes');
  38
  39 debug('This test stresses drawing a large number of points and workarounds created to run WebGL with simulated attrib 0');
  40
  41 if (confirm('After clicking OK your machine may become unresponsive or crash.')) {
  42   var wtu = WebGLTestUtils;
  43   var gl = wtu.create3DContext('testbed');
  44
  45   var program1 = wtu.setupProgram(gl, ['vshader', 'fshader']);
  46
  47   gl.enable(gl.BLEND);
  48
  49   debug('Draw 2^31 points with a shader that takes no attributes and verify it fills the whole canvas.');
  50
  51   gl.drawArrays(gl.POINTS, 0, Math.pow(2, 31) - 1);
  52   wtu.glErrorShouldBe(gl, gl.NO_ERROR);
  53   wtu.checkCanvas(gl, [0, 255, 0, 255]);
  54 }
  55
  56 var successfullyParsed = true;
  57 </script>
  58 <script src="../js/js-test-post.js"></script>
  59
  60 </body>
  61 </html>