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<body class='hmmessage'><div dir='ltr'>Dear All,<br>I have a question, When a glcontext is lost and again restored , what should be the behaviour of associated extensions ?<br>I have a test case http://www.khronos.org/registry/webgl/sdk/tests/conformance/context/context-lost-restored.html,<br>and in it I am confused to see that upon context restoration , test case expects extension 's related API's to be NULL .<br><br>here is the js code snippet from above mentioned link:<br><br><br><pre id="line1"><span>function testOESVertexArrayObject() {
<span id="line258"></span> if (OES_vertex_array_object) {
<span id="line259"></span> // Extension must still be lost.
<span id="line260"></span> shouldBeNull("OES_vertex_array_object.createVertexArrayOES()"); // WHY ????
<span id="line261"></span> // Try re-enabling extension
<span id="line262"></span>
<span id="line263"></span> old_OES_vertex_array_object = OES_vertex_array_object;
<span id="line264"></span> OES_vertex_array_object = reGetExtensionAndTestForProperty(gl, "OES_vertex_array_object", false);
<span id="line265"></span> shouldBeTrue("OES_vertex_array_object.createVertexArrayOES() != null");
<span id="line266"></span> shouldBeTrue("old_OES_vertex_array_object.createVertexArrayOES() == null");
<span id="line267"></span> }
<span id="line268"></span>}
<span id="line269"></span>
<span id="line270"></span>function testExtensions() {
<span id="line271"></span> testOESTextureFloat();
<span id="line272"></span> testOESVertexArrayObject();
<span id="line273"></span> // Only the WEBGL_lose_context extension should be the same object after context lost.
<span id="line274"></span> new_WEBGL_lose_context = reGetExtensionAndTestForProperty(gl, "WEBGL_lose_context", true);
<span id="line275"></span>}
<span id="line276"></span><br><br>/// this function is a callback function , which is attached to addeventlistener in above mention link//<br><br><span id="line277"></span>function testRestoredContext()
<span id="line278"></span>{
<span id="line279"></span> debug("Test restored context");
<span id="line280"></span> shouldBeFalse("contextRestoredEventFired");
<span id="line281"></span> contextRestoredEventFired = true;
<span id="line282"></span> shouldBeFalse("gl.isContextLost()");
<span id="line283"></span> shouldBe("gl.getError()", "gl.NO_ERROR");
<span id="line284"></span>
<span id="line285"></span> // Validate that using old resources fails.
<span id="line286"></span> testResources(gl.INVALID_OPERATION);
<span id="line287"></span>
<span id="line288"></span> testRendering();
<span id="line289"></span>
<span id="line290"></span> // Validate new resources created in testRendering().
<span id="line291"></span> testResources(gl.NO_ERROR);
<span id="line292"></span>
<span id="line293"></span> testExtensions();
<span id="line294"></span>
<span id="line295"></span> debug("");
<span id="line296"></span>}<br><br>Our Webkit Nightly Build fails </span><br><span> shouldBeNull("OES_vertex_array_object.createVertexArrayOES()")</span></pre>which it should fail , however khronous test case suite expects it to PASS , adn i tested this on chrome on windows, that passes :(<br><br><br>Kindly put some light here..<br>regards<br>rsadhu<br><br><div><br></div>regards<br><div>RSadhu</div> </div></body>
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