dom/canvas/test/webgl-conf/checkout/conformance2/reading/read-pixels-from-rgb8-into-pbo-bug.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 Conformance Test: readPixels from RGB8 Buffer Into Pixel Pack Buffer.</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 <canvas id="example" width="4" height="4"></canvas>
  18 <div id="description"></div>
  19 <div id="console"></div>
  20 <script>
  21 "use strict";
  22
  23 debug("");
  24 description("Verifies readPixels from RGB8 buffer into PIXEL_PACK buffer works");
  25
  26 debug("On MacOSX with AMD GPUs, the alpha channel is readback as 0 instead of 255");
  27
  28 var wtu = WebGLTestUtils;
  29 var pixel = [0, 0, 0, 0];
  30 var expectedColor = [255, 102, 0, 255];
  31
  32 var canvas = document.getElementById("example");
  33 var gl = wtu.create3DContext(canvas, undefined, 2);
  34
  35 if (!gl) {
  36   testFailed("context does not exist");
  37 } else {
  38   testPassed("context exists");
  39
  40   var width = 4;
  41   var height = 4;
  42
  43   var renderbuffer = gl.createRenderbuffer();
  44   gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
  45   gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGB8, width, height);
  46
  47   var fbo = gl.createFramebuffer();
  48   gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
  49   gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, renderbuffer);
  50
  51   if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE) {
  52     testFailed("framebuffer with RGB8 color buffer is incomplete");
  53   } else {
  54     gl.clearColor(1.0, 0.0, 0.0, 1.0);
  55     gl.clear(gl.COLOR_BUFFER_BIT);
  56
  57     var pbo = gl.createBuffer();
  58     gl.bindBuffer(gl.PIXEL_PACK_BUFFER, pbo);
  59     gl.bufferData(gl.PIXEL_PACK_BUFFER, width * height * 4, gl.STATIC_COPY);
  60
  61     gl.readPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, 0);
  62
  63     var data = new Uint8Array(width * height * 4);
  64     gl.getBufferSubData(gl.PIXEL_PACK_BUFFER, 0, data);
  65
  66     for (var ii = 0; ii < width * height; ++ii) {
  67       if (data[ii * 4] != 255 ||
  68           data[ii * 4 + 1] != 0 ||
  69           data[ii * 4 + 2] != 0 ||
  70           data[ii * 4 + 3] != 255) {
  71         testFailed("Expected in pixel " + ii + ": [255,0,0,255], got: " +
  72                    [data[ii * 4], data[ii * 4 + 1], data[ii * 4 + 2], data[ii * 4 + 3]]);
  73         break;
  74       }
  75     }
  76   }
  77   wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Tests should complete without gl errors");
  78 }
  79
  80 debug("");
  81 var successfullyParsed = true;
  82 </script>
  83 <script src="../../js/js-test-post.js"></script>
  84 </body>
  85 </html>