Test webgl2 vs. webgl canvas context modes. (#2701)

This test covers the following HTML spec pull request: whatwg/html#3971
KhronosGroup · Aug 30, 2018 · fba3728 · fba3728
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diff --git a/sdk/tests/conformance2/context/00_test_list.txt b/sdk/tests/conformance2/context/00_test_list.txt
@@ -1,5 +1,6 @@
 constants-and-properties-2.html
 context-attributes-depth-stencil-antialias-obeyed.html
+--min-version 2.0.1 context-mode.html
 --min-version 2.0.1 context-sharing-texture2darray-texture3d-data-bug.html
 context-type-test-2.html
 --min-version 2.0.1 context-resize-changes-buffer-binding-bug.html

diff --git a/sdk/tests/conformance2/context/context-mode.html b/sdk/tests/conformance2/context/context-mode.html
@@ -0,0 +1,77 @@
+<!--
+
+/*
+** Copyright (c) 2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+-->
+
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>WebGL2 Canvas Context Mode Conformance Tests</title>
+<link rel="stylesheet" href="../../resources/js-test-style.css"/>
+<script src="../../js/js-test-pre.js"></script>
+<script src="../../js/webgl-test-utils.js"></script>
+</head>
+<body>
+<div id="description"></div>
+<div id="console"></div>
+<script>
+"use strict";
+description("This test ensures WebGL 2.0 implementations respect the canvas's context mode.");
+
+debug("");
+
+assertMsg(window.WebGLRenderingContext,
+          "WebGL2RenderingContext should be a member of window");
+assertMsg('WebGL2RenderingContext' in window,
+          "WebGL2RenderingContext should be 'in' window");
+
+function testContextMode(mode, altMode) {
+  debug("Testing " + mode + " context type");
+
+  let c = document.createElement('canvas');
+  c.width = 2;
+  c.height = 2;
+  let gl = c.getContext(mode);
+  assertMsg(c.getContext(mode) == gl,
+            "Canvas.getContext('" + mode + "') should return the same value every time");
+  try {
+    assertMsg(c.getContext(altMode) == null,
+              "Canvas.getContext('" + altMode + "') after getContext('" + mode + "') should return null");
+  } catch (e) {
+    testFailed("Canvas.getContext('" + altMode + "') after getContext('" + mode + "') should not throw an exception");
+  }
+}
+
+testContextMode('webgl2', 'webgl');
+testContextMode('webgl', 'webgl2');
+
+debug("");
+var successfullyParsed = true;
+</script>
+<script src="../../js/js-test-post.js"></script>
+
+</body>
+</html>