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The Tor Browser
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clearbufferfv-with-alpha-false.html (2498B)

      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>Test clearBufferfv with alpha:false canvas</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 <div id="console"></div>
     19 <canvas id="canvas" width="20" height="20"> </canvas>
     20 <script>
     21 "use strict";
     22 description("This tests the operation of clearBufferfv with the back buffer of an alpha:false canvas.");
     23 
     24 function verifyOnePixel(readFormat, readType, arrayType, expectedColor) {
     25  var buffer = new arrayType(4);
     26  gl.readPixels(0, 0, 1, 1, readFormat, readType, buffer);
     27  if (buffer[0] == expectedColor[0] &&
     28      buffer[1] == expectedColor[1] &&
     29      buffer[2] == expectedColor[2] &&
     30      buffer[3] == expectedColor[3]) {
     31    testPassed("clearBufferfv set the color buffer to the correct value");
     32  } else {
     33    testFailed("clearBufferfv failed to work. Expected: " + expectedColor + ", got: " + buffer);
     34  }
     35 }
     36 
     37 function testClearBuffer(func, format, arrayType, readFormat, readType, readArrayType) {
     38  debug("");
     39  debug("Testing " + func);
     40 
     41  var srcData = new arrayType([0, 1, 0, 0]);
     42  gl[func](gl.COLOR, 0, srcData);
     43  wtu.glErrorShouldBe(gl, gl.NO_ERROR, "clearBuffer with no srcOffset should succeed");
     44  // Back buffer has no alpha channel
     45  verifyOnePixel(readFormat, readType, Uint8Array, [0, 255, 0, 255]);
     46 }
     47 
     48 var wtu = WebGLTestUtils;
     49 var canvas = document.getElementById("canvas");
     50 var gl = wtu.create3DContext(canvas, { alpha:false }, 2);
     51 if (!gl) {
     52  testFailed("context does not exist");
     53 } else {
     54  testPassed("context exists");
     55 
     56  var testCases = [
     57    {
     58      func: "clearBufferfv", format: gl.RGBA, arrayType: Float32Array,
     59      readFormat: gl.RGBA, readType: gl.UNSIGNED_BYTE, readArrayType: Uint8Array,
     60    },
     61  ];
     62 
     63  for (var tt = 0; tt < testCases.length; ++tt) {
     64    var test = testCases[tt];
     65    if (test.extension && !gl.getExtension(test.extension))
     66      continue;
     67    testClearBuffer(test.func, test.format, test.arrayType,
     68                    test.readFormat, test.readType, test.readArrayType);
     69  }
     70 }
     71 
     72 debug("");
     73 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "should be no error");
     74 var successfullyParsed = true;
     75 
     76 </script>
     77 <script src="../../js/js-test-post.js"></script>
     78 
     79 </body>
     80 </html>