Verify that 'webgl' and 'webgl2' context types are distinct. (Khronos…

…Group#3282) Test case for https://bugs.webkit.org/show_bug.cgi?id=222758 . Already passes in Chrome and Firefox.
chcunningham · May 4, 2021 · b027b53 · b027b53
1 parent 1b5a6c9
commit b027b53
Showing 1 changed file with 46 additions and 17 deletions.
diff --git a/sdk/tests/conformance2/context/context-type-test-2.html b/sdk/tests/conformance2/context/context-type-test-2.html
@@ -16,33 +16,62 @@
 <body>
 <div id="description"></div>
 <div id="console"></div>
-<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
-<canvas id="canvas2d" width="40" height="40"> </canvas>
+<canvas id="canvas1" style="width: 50px; height: 50px;"> </canvas>
+<canvas id="canvas2" style="width: 50px; height: 50px;"> </canvas>
 <script>
 "use strict";
 description("This test ensures WebGL2 implementations interact correctly with the canvas tag.");
 
 debug("");
 debug("Canvas.getContext");
 
-assertMsg(window.WebGLRenderingContext,
-          "WebGL2RenderingContext should be a member of window");
-assertMsg('WebGL2RenderingContext' in window,
-          "WebGL2RenderingContext should be 'in' window");
-
-var wtu = WebGLTestUtils;
-var canvas = document.getElementById("canvas");
-var gl = wtu.create3DContext(canvas, null, 2);
-if (!gl) {
-  testFailed("context does not exist");
-} else {
-  testPassed("context exists");
-
-  debug("Checking context type");
-  assertMsg(gl instanceof WebGL2RenderingContext,
+function runTest() {
+  assertMsg(window.WebGL2RenderingContext,
+            "WebGL2RenderingContext should be a member of window");
+  assertMsg('WebGL2RenderingContext' in window,
+            "WebGL2RenderingContext should be 'in' window");
+
+  const wtu = WebGLTestUtils;
+  let canvas2 = document.getElementById("canvas2");
+  let gl2 = wtu.create3DContext(canvas2, null, 2);
+  if (!gl2) {
+    testFailed("Could not fetch WebGL 2.0 context");
+    return;
+  }
+  testPassed("Fetched WebGL2 context successfully");
+
+  debug("Checking WebGL2 context type");
+  assertMsg(gl2 instanceof WebGL2RenderingContext,
             "context type should be WebGL2RenderingContext");
+
+  // WebGL1 contexts do not respond to the WebGL2 context type, and vice versa.
+  let canvas1 = document.getElementById("canvas1");
+  let gl1 = wtu.create3DContext(canvas1, null, 1);
+  if (!gl1) {
+    testFailed("Could not fetch WebGL 1.0 context");
+    return;
+  }
+
+  debug("Checking WebGL1 context type");
+  assertMsg(gl1 instanceof WebGLRenderingContext,
+            "context type should be WebGLRenderingContext");
+
+  let msg1 = "A canvas which has created a WebGL 1.0 context should not return it for a 'webgl2' context request";
+  if (canvas1.getContext("webgl2"))
+    testFailed(msg1);
+  else
+    testPassed(msg1);
+
+  let msg2 = "A canvas which has created a WebGL 2.0 context should not return it for a 'webgl' context request";
+  if (canvas2.getContext("webgl"))
+    testFailed(msg2);
+  else
+    testPassed(msg2);
 }
+
+runTest();
 debug("");
+
 var successfullyParsed = true;
 </script>
 <script src="../../js/js-test-post.js"></script>