dom/canvas/test/webgl-conf/checkout/conformance/manual/canvas-no-clear-on-unsuccessful-draw.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 the canvas is NOT recomposited after unsucessful draw call</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 a canvas is NOT cleared
  30 when a draw call fails.
  31
  32 You should see two <span class="correct">green rectangles</span>
  33 with black outlines on success.
  34 </pre>
  35 <canvas id='c1'></canvas>
  36 <canvas id='c2'></canvas>
  37 <div id="console"></div>
  38 <script>
  39 "use strict";
  40 var wtu = WebGLTestUtils;
  41 var c1 = document.getElementById("c1");
  42 var c2 = document.getElementById("c2");
  43 var gl1 = wtu.create3DContext(c1);
  44 var gl2 = wtu.create3DContext(c2);
  45 gl1.clearColor(0,1,0,1);
  46 gl1.clear(gl1.COLOR_BUFFER_BIT);
  47 gl2.clearColor(0,1,0,1);
  48 gl2.clear(gl2.COLOR_BUFFER_BIT);
  49 wtu.waitForComposite(function() {
  50   gl1.drawArrays(gl1.BLEND, 0, 0);
  51   wtu.glErrorShouldBe(gl1, gl1.INVALID_ENUM, "no errors");
  52 });
  53
  54 wtu.waitForComposite(function() {
  55   var buf = gl2.createBuffer();
  56   gl2.bindBuffer(gl2.ELEMENT_ARRAY_BUFFER, buf);
  57   gl2.bufferData(gl2.ELEMENT_ARRAY_BUFFER, new Uint8Array(1), gl2.STATIC_DRAW);
  58   gl2.drawElements(gl2.BLEND, 0, gl2.UNSIGNED_SHORT, 0);
  59   wtu.glErrorShouldBe(gl2, gl2.INVALID_ENUM, "no errors");
  60 });
  61 </script>
  62 </body>
  63 </html>