dom/canvas/test/webgl-conf/checkout/conformance/limits/gl-line-width.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>Verify that line width limits are enforced.</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" style="width: 40px; height: 30px;"></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");
  25
  26 // Query the line width range
  27 var lineWidthRange = gl.getParameter(gl.ALIASED_LINE_WIDTH_RANGE);
  28 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be no errors.");
  29
  30 if (lineWidthRange[0] > 1 || lineWidthRange[1] < 1)
  31   testFailed("Line width range must include width 1");
  32
  33 // Zero, negative, or NaN values should cause an error and leave the value unchanged.
  34 var curLineWidth = gl.getParameter(gl.LINE_WIDTH);
  35 gl.lineWidth(0);
  36 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to zero");
  37 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved
  38
  39 gl.lineWidth(-1);
  40 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to a negative value");
  41 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved
  42
  43 gl.lineWidth(NaN);
  44 wtu.glErrorShouldBe(gl, gl.INVALID_VALUE, "Should not be able to set lineWidth to NaN");
  45 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'curLineWidth'); // Previous value should be preserved
  46
  47 // Check that the line width can be set to the valid range.
  48 gl.lineWidth(lineWidthRange[1]);
  49 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the max supported value");
  50 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[1]');
  51
  52 gl.lineWidth(lineWidthRange[0]);
  53 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the min supported value");
  54 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[0]');
  55
  56 // Checks that the line width can be set outside the supported range without error,
  57 // and the unclamped value can be queried back.
  58 // Yes, this is actually what the spec says should happen.
  59 // See: https://www.khronos.org/opengles/sdk/docs/man3/html/glLineWidth.xhtml
  60 gl.lineWidth(lineWidthRange[1]+1);
  61 wtu.glErrorShouldBe(gl, gl.NO_ERROR, "Should be able to set lineWidth to the above max supported value");
  62 shouldBe('gl.getParameter(gl.LINE_WIDTH)', 'lineWidthRange[1]+1');
  63
  64 var successfullyParsed = true;
  65
  66 </script>
  67 <script src="../../js/js-test-post.js"></script>
  68
  69 </body>
  70 </html>
  71
  72