dom/canvas/test/webgl-conf/checkout/conformance/manual/angle-instanced-arrays-state-leakage.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>Check that ANGLE_instanced_arrays state does not leak to browser</title>
  12 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
  13 <script src="../../js/js-test-pre.js"></script>
  14 <script src="../../js/webgl-test-utils.js"></script>
  15 <style>
  16 canvas {
  17     border: 1px solid black;
  18 }
  19 .correct {
  20     border: 1px solid black;
  21     background-color: #00ff00;
  22 }
  23 </style>
  24 </head>
  25 <body>
  26 <pre>
  27 This test must be run manually.
  28
  29 This test tests that leaving state for ANGLE_instanced_arrays with non-default values at the
  30 end of rendering does not interfere with proper compositing of results.
  31 Failures seen on Linux and Mac with Chrome 32.
  32 See http://crbug.com/304927 for more info.
  33
  34 You should see a <span class="correct">green rectangle</span>
  35 with black a outline on success.  Briefly flashing red is normal.
  36 </pre>
  37 <canvas id='c'></canvas>
  38 <div id="console"></div>
  39 <script>
  40 "use strict";
  41 var wtu = WebGLTestUtils;
  42 var c = document.getElementById("c");
  43 // The bug has only been seen with preserveDrawingBuffer=true.
  44 var gl = wtu.create3DContext(c, { preserveDrawingBuffer: true });
  45 var ext = wtu.getExtensionWithKnownPrefixes(gl, "ANGLE_instanced_arrays");
  46 var frame = 0;
  47 function render() {
  48   var RED_FRAMES = 3;
  49   if (frame < RED_FRAMES) {
  50     // Draw N frames red, leaving the vertex divisor to 0 after each call.
  51     gl.clearColor(1,0,0,1);
  52     gl.clear(gl.COLOR_BUFFER_BIT);
  53     wtu.requestAnimFrame(render);
  54   } else {
  55     // Draw 2 more times in green, setting the divisor to 1 afterward.
  56     gl.clearColor(0,1,0,1);
  57     gl.clear(gl.COLOR_BUFFER_BIT);
  58     if (frame - RED_FRAMES < 2) {
  59       wtu.requestAnimFrame(render);
  60     } else {
  61       finishTest();
  62     }
  63     // Leave attrib 0 set with a divisor of 1 before returning to browser.
  64     if (ext) {
  65        ext.vertexAttribDivisorANGLE(0, 1);
  66     }
  67   }
  68   frame++;
  69 }
  70
  71 if (!ext) {
  72   testPassed("No ANGLE_instanced_arrays support -- this is legal");
  73 }
  74 wtu.requestAnimFrame(render);
  75 var successfullyParsed = true;
  76 </script>
  77 </body>
  78 </html>