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read-pixels-from-rgb8-into-pbo-bug.html (2622B)

      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>