4 ** Copyright (c) 2014 The Khronos Group Inc.
6 ** Permission is hereby granted, free of charge, to any person obtaining a
7 ** copy of this software and/or associated documentation files (the
8 ** "Materials"), to deal in the Materials without restriction, including
9 ** without limitation the rights to use, copy, modify, merge, publish,
10 ** distribute, sublicense, and/or sell copies of the Materials, and to
11 ** permit persons to whom the Materials are furnished to do so, subject to
12 ** the following conditions:
14 ** The above copyright notice and this permission notice shall be included
15 ** in all copies or substantial portions of the Materials.
17 ** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
21 ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
31 <meta charset="utf-8">
32 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
33 <script src="../../resources/js-test-pre.js"></script>
34 <script src="../resources/webgl-test-utils.js"></script>
38 <canvas id="example"></canvas>
39 <div id="description"></div>
40 <div id="console"></div>
44 // Regression test for http://crbug.com/368582
45 description('Tests to ensure that a 2D canvas is still usable after being used as the source for a texImage2D');
47 var wtu = WebGLTestUtils;
48 var canvas = document.getElementById("example");
51 var ctx = canvas.getContext("2d");
53 var image = new Image();
54 image.src = '../resources/blue-1x1.jpg';
56 var gl = wtu.create3DContext();
57 var texture = gl.createTexture();
59 function checkPixels() {
60 // Read back the frame buffer
61 var imgData = ctx.getImageData(0,0,canvas.width,canvas.height);
62 var buf = imgData.data;
64 var expected = [0, 0, 255, 255];
67 // Verify the frame buffer's contents
69 for (var y = 0; y < canvas.height; y++) {
70 for (var x = 0; x < canvas.width; x++) {
71 var i = y * canvas.width + x;
72 if (Math.abs(buf[4 * i + 0] - expected[0]) > tolerance ||
73 Math.abs(buf[4 * i + 1] - expected[1]) > tolerance ||
74 Math.abs(buf[4 * i + 2] - expected[2]) > tolerance ||
75 Math.abs(buf[4 * i + 3] - expected[3]) > tolerance) {
76 testFailed("pixel at (" + x + ", " + y +") was (" +
77 buf[4 * i + 0] + ", " +
78 buf[4 * i + 1] + ", " +
79 buf[4 * i + 2] + ", " +
80 buf[4 * i + 3] + "), should be (" +
96 testPassed("All pixels matched expected values");
99 function renderToCanvas() {
100 // Clear the 2d canvas then draw the image to it (a blue pixel)
101 ctx.clearRect(0, 0, canvas.width, canvas.height);
102 ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
104 // Upload the results to a WebGL texture
105 gl.bindTexture(gl.TEXTURE_2D, texture);
106 gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA,
107 gl.UNSIGNED_BYTE, canvas);
110 image.onload = function() {
119 var successfullyParsed = true;