dom/canvas/test/webgl-conf/checkout/conformance2/textures/misc/tex-image-10bpc.html

   1 <!--
   2 Copyright (c) 2023 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>Ensure 10bpc image is not crushed to 8bpc in texImage2D</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="24" height="24"></canvas>
  18 <div id="description"></div>
  19 <div id="console"></div>
  20 <script>
  21 "use strict";
  22 description(document.title);
  23 var wtu = WebGLTestUtils;
  24 var gl = wtu.create3DContext("example", undefined, 2);
  25 var uniquePixels;
  26
  27 // This is an 8x1, 10-bit-per-channel PNG (encoded as 16bpc).
  28 // The first pixel is black, and each next pixel is one brighter; approximately:
  29 // (0/1023,0,0), (1/1023,0,0), (2/1023,0,0), ..., (7/1023,0,0)
  30 const imgW = 8, imgH = 1;
  31 const imgURL = "../../../resources/red-gradient-8x1-10bit-untagged.png";
  32
  33 const img = document.createElement("img");
  34 img.onload = () => {
  35   const tex = gl.createTexture();
  36   gl.bindTexture(gl.TEXTURE_2D, tex);
  37   const level = 0;
  38   const internalformat = gl.RGB10_A2;
  39   const border = 0;
  40   const format = gl.RGBA;
  41   const type = gl.UNSIGNED_INT_2_10_10_10_REV;
  42   gl.texImage2D(gl.TEXTURE_2D, level, internalformat, imgW, imgH, border, format, type, img);
  43
  44   const fbo = gl.createFramebuffer();
  45   gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
  46   gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0);
  47
  48   shouldBe("gl.checkFramebufferStatus(gl.FRAMEBUFFER)", "gl.FRAMEBUFFER_COMPLETE");
  49
  50   const pixels = new Uint32Array(imgW * imgH);
  51   gl.readPixels(0, 0, imgW, imgH, format, type, pixels);
  52   uniquePixels = new Set(pixels);
  53   // If the image was crushed to 8bpc, there will be 2-3 distinct values:
  54   // (0/255,0,0), (1/255,0,0), and maybe (2/255,0,0) (depending on truncation vs rounding).
  55   // If it wasn't, there should be 7-8.
  56   // At time of writing, on Mac M1, Chrome gets 2 if it's crushed, and 7 if it's not.
  57   shouldBeGreaterThanOrEqual("uniquePixels.size", "7", "there should be at least 7 distinct color values");
  58
  59   finishTest();
  60 };
  61 img.src = imgURL;
  62
  63 var successfullyParsed = true;
  64 </script>
  65 </body>
  66 </html>