dom/canvas/test/webgl-conf/checkout/extra/readpixels-after-alert.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 <title>WebGL Behavior After Alert and Read Pixels Test</title>
  12 <link rel="stylesheet" href="../resources/js-test-style.css"/>
  13 <script src="../../devtools/src/debug/webgl-debug.js"></script>
  14 <script src="../js/js-test-pre.js"></script>
  15 <script src="../js/webgl-test-utils.js"></script>
  16 </head>
  17 <body>
  18 <canvas id="canvas" width="100" height="100"> </canvas>
  19 <div id="description">Verify WebGL behavior after an alert and then a readPixels()</div>
  20 <div id="console"></div>
  21 <script>
  22 "use strict";
  23
  24 function checkPixels(buf, width, height, thresh) {
  25   for (var yy = 0; yy < height; ++yy) {
  26     for (var xx = 0; xx < width; ++xx) {
  27       var offset = (yy * width + xx) * 4;
  28       if (Math.abs(buf[offset] - 255) > thresh ||
  29           Math.abs(buf[offset + 1] - 0) > thresh ||
  30           Math.abs(buf[offset + 2] - 0) > thresh) {
  31         testFailed("Checking pixels");
  32         return false;
  33       }
  34     }
  35   }
  36   testPassed("Checking pixels");
  37   return true;
  38 }
  39
  40 var wtu = WebGLTestUtils;
  41 var gl = wtu.create3DContext("canvas");
  42 gl.clearColor(1, 0, 0, 1);
  43 gl.clear(gl.COLOR_BUFFER_BIT);
  44 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");
  45
  46 wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
  47
  48 alert("Click me to continue");
  49
  50 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "setup should succeed");
  51 wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
  52
  53 alert("Click me to continue");
  54
  55 gl.clearColor(1, 0, 0, 1);
  56 gl.clear(gl.COLOR_BUFFER_BIT);
  57 wtu.checkCanvas(gl, [255, 0, 0, 255], undefined, 3);
  58
  59 debug("");
  60 var successfullyParsed = true;
  61 </script>
  62 <script src="../js/js-test-post.js"></script>
  63
  64 </body>
  65 </html>