content/test/data/gpu/functional_files/context.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Global variable.
   6 var gl_context;
   7
   8 initializeWebGL = function(canvas) {
   9   gl_context = null;
  10   // Try to grab the standard context.
  11   gl_context = canvas.getContext("webgl") ||
  12                canvas.getContext("experimental-webgl");
  13   // If we don't have a GL context, give up now
  14   if (!gl_context) {
  15     alert("Unable to initialize WebGL. Your browser may not support it.");
  16   }
  17 }
  18
  19 startWebGLContext = function() {
  20   var canvas = document.getElementById("glcanvas");
  21   // Initialize the GL context.
  22   initializeWebGL(canvas);
  23
  24   // Only continue if WebGL is available and working.
  25   if (gl_context) {
  26     gl_context.clearColor(0.0, 0.0, 0.0, 1.0);
  27     gl_context.enable(gl_context.DEPTH_TEST);
  28     gl_context.depthFunc(gl_context.LEQUAL);
  29     gl_context.clearDepth(1);
  30     gl_context.clear(gl_context.COLOR_BUFFER_BIT |
  31                      gl_context.DEPTH_BUFFER_BIT);
  32   }
  33 }