dom/canvas/test/webgl-conf/checkout/conformance2/rendering/canvas-resizing-with-pbo-bound.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 2 Resizing With PBO Bound Test</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 </head>
  16 <body>
  17 <div id="description"></div>
  18 <canvas id="canvas1" style="width: 256px; height: 256px;"> </canvas>
  19 <canvas id="canvas2" style="width: 256px; height: 256px;"> </canvas>
  20 <div id="console"></div>
  21 <script>
  22 "use strict";
  23
  24 description("Verifies that resizing the canvas (recreating the backing framebuffer) works correctly while a PBO is bound.");
  25
  26 debug("");
  27 debug("Regression test for Chromium <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=644572'>Issue 644572</a>");
  28 debug("");
  29
  30 var wtu = WebGLTestUtils;
  31 var canvas;
  32 var largeSize = 256;
  33 var smallSize = 128;
  34 var currentSize;
  35 var gl;
  36 var numFrames = 0;
  37 var testNumber = 0;
  38 var pbo;
  39
  40 function nextTest() {
  41   ++testNumber;
  42   numFrames = 0;
  43   currentSize = largeSize;
  44   if (testNumber > 2) {
  45     finishTest();
  46     return;
  47   }
  48
  49   canvas = document.getElementById("canvas" + testNumber);
  50   canvas.width = currentSize;
  51   canvas.height = currentSize;
  52   var usePreserveDrawingBuffer = (testNumber == 1) ? true : false;
  53   debug("Testing preserveDrawingBuffer = " + usePreserveDrawingBuffer);
  54   gl = wtu.create3DContext(canvas, { preserveDrawingBuffer: usePreserveDrawingBuffer }, 2);
  55
  56   if (!gl) {
  57     testFailed("context does not exist");
  58
  59     wtu.requestAnimFrame(nextTest);
  60   } else {
  61     testPassed("context exists");
  62
  63     gl.clearColor(0, 1, 0, 1);
  64
  65     pbo = gl.createBuffer();
  66     gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, pbo);
  67
  68     wtu.requestAnimFrame(render);
  69   }
  70 }
  71
  72 function render() {
  73   if (++numFrames < 4) {
  74     if (currentSize == largeSize) {
  75       canvas.height = smallSize;
  76       currentSize = smallSize;
  77     } else {
  78       canvas.height = largeSize;
  79       currentSize = largeSize;
  80     }
  81   }
  82
  83   gl.viewport(0, 0, largeSize, currentSize);
  84   gl.clear(gl.COLOR_BUFFER_BIT);
  85
  86   // Check the four corners
  87   var green = [ 0, 255, 0, 255 ];
  88   var inset = 3;
  89   wtu.checkCanvasRect(gl, inset, inset, 1, 1, green, "lower left should be green", 1);
  90   wtu.checkCanvasRect(gl, largeSize - inset, inset, 1, 1, green, "lower right should be green", 1);
  91   wtu.checkCanvasRect(gl, inset, currentSize - inset, 1, 1, green, "upper left should be green", 1);
  92   wtu.checkCanvasRect(gl, largeSize - inset, currentSize - inset, 1, 1, green, "upper right should be green", 1);
  93
  94   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No GL error");
  95   if (gl.getParameter(gl.PIXEL_UNPACK_BUFFER_BINDING) != pbo) {
  96     testFailed("Pixel unpack buffer binding was lost");
  97   }
  98
  99   if (numFrames < 4) {
 100     wtu.requestAnimFrame(render);
 101   } else {
 102     wtu.requestAnimFrame(nextTest);
 103   }
 104 }
 105
 106 wtu.requestAnimFrame(nextTest);
 107
 108 </script>
 109
 110 </body>
 111 </html>