third_party/WebKit/LayoutTests/fast/canvas/webgl/offscreenCanvas-context-lost-restored.html - chromium/src - Git at Google

 <!DOCTYPE html>
 <html>
 <head>
 <script src="../../../resources/testharness.js"></script>
 <script src="../../../resources/testharnessreport.js"></script>
 <script src="./resources/webgl-test.js"></script>
 <script src="./resources/webgl-test-utils-full.js"></script>
 </head>
 <body>
 <script>
 var wtu = WebGLTestUtils;
 var canvas;
 var gl;
 var WEBGL_lose_context;
 var new_WEBGL_lose_context;
 var allowRestore;
 var contextLostEventFired;
 var contextRestoredEventFired;
 var OES_vertex_array_object;
 var old_OES_vertex_array_object;
 var OES_texture_float;
 var newExtension;

 async_test(function(t) {
     if (!setupTest()) {
         assert_true(false, 'Cannot initialize test');
         t.done();
     }

     canvas.addEventListener("webglcontextlost", t.step_func(function(e) {
         testLostContext(e);
         // restore the context after this event has exited.
         setTimeout(function() {
             // we didn't call prevent default so we should not be able to restore the context
             compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()");
             testLosingAndRestoringContext(t);
         }, 0);
     }));
     canvas.addEventListener("webglcontextrestored", testShouldNotRestoreContext);
     allowRestore = false;
     contextLostEventFired = false;
     contextRestoredEventFired = false;

     testOriginalContext();
     WEBGL_lose_context.loseContext();
     // The context should be lost immediately.
     assert_true(gl.isContextLost());
     assert_equals(gl.getError(), gl.CONTEXT_LOST_WEBGL);
     assert_equals(gl.getError(), gl.NO_ERROR);
     // gl methods should be no-ops
     compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
     // but the event should not have been fired.
     assert_false(contextLostEventFired);
 }, 'Test WebGL context restoration with OffscreenCanvas');

 function compareGLError(glError, evalStr)
 {
     var exception;
     try {
         eval(evalStr);
     } catch (e) {
         exception = e;
     }
     if (exception) {
         assert_true(false, evalStr + " threw exception " + exception);
     } else {
         assert_equals(gl.getError(), glError);
     }
 }

 function setupTest()
 {
     canvas = new OffscreenCanvas(10, 10);
     gl = canvas.getContext('webgl');
     WEBGL_lose_context = getExtensionAndAddProperty(gl, "WEBGL_lose_context");
     if (!WEBGL_lose_context)
         return false;

     // Try to get a few extensions
     OES_vertex_array_object = getExtensionAndAddProperty(gl, "OES_vertex_array_object");
     OES_texture_float = getExtensionAndAddProperty(gl, "OES_texture_float");

     return true;
 }

 function getExtensionAndAddProperty(gl, name) {
   var ext = wtu.getExtensionWithKnownPrefixes(gl, name);
   if (ext) {
     ext.webglTestProperty = true;
   }
   return ext;
 }

 function reGetExtensionAndTestForProperty(gl, name, expectProperty) {
   newExtension = wtu.getExtensionWithKnownPrefixes(gl, name);
   // NOTE: while getting a extension after context lost/restored is allowed to fail
   // for the purpose the conformance tests it is not.
   //
   // Hypothetically the user can switch GPUs live. For example on Windows, install 2 GPUs,
   // then in the control panen enable 1, disable the others and visa versa. Since the GPUs
   // have different capabilities one or the other may not support a particlar extension.
   //
   // But, for the purpose of the conformance tests the context is expected to restore
   // on the same GPU and therefore the extensions that succeeded previously should
   // succeed on restore.
   assert_true(newExtension != null);
   if (expectProperty) {
     assert_true(newExtension.webglTestProperty === true);
   } else {
     assert_true(newExtension.webglTestProperty === undefined);
   }
   return newExtension;
 }

 function testLosingAndRestoringContext(t)
 {
     if (!setupTest()) {
         assert_true(false, 'Cannot initialize test');
         t.done();
     }

     canvas.addEventListener("webglcontextlost", function(e) {
       testLostContext(e);
       // restore the context after this event has exited.
       setTimeout(function() {
         compareGLError(gl.NO_ERROR, "WEBGL_lose_context.restoreContext()");
         // The context should still be lost. It will not get restored until the
         // webglrestorecontext event is fired.
         assert_true(gl.isContextLost());
         assert_equals(gl.getError(), gl.NO_ERROR);
         // gl methods should still be no-ops
         compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
       }, 0);
     });
     canvas.addEventListener("webglcontextrestored", t.step_func_done(function() {
       testRestoredContext();
     }));
     allowRestore = true;
     contextLostEventFired = false;
     contextRestoredEventFired = false;

     testOriginalContext();
     WEBGL_lose_context.loseContext();
     // The context should be lost immediately.
     assert_true(gl.isContextLost());
     assert_equals(gl.getError(), gl.CONTEXT_LOST_WEBGL);
     assert_equals(gl.getError(), gl.NO_ERROR);
     // gl methods should be no-ops
     compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
     // but the event should not have been fired.
     assert_false(contextLostEventFired);
 }

 function testOriginalContext()
 {
     assert_false(gl.isContextLost());
     assert_equals(gl.getError(), gl.NO_ERROR);
 }

 function testLostContext(e)
 {
     assert_false(contextLostEventFired);
     contextLostEventFired = true;
     assert_true(gl.isContextLost());
     assert_equals(gl.getError(), gl.NO_ERROR);
     if (allowRestore)
       e.preventDefault();
 }

 function testShouldNotRestoreContext(e)
 {
     assert_true(false, "Should not restore the context unless preventDefault is called on the context lost event");
 }

 function testOESTextureFloat() {
   if (OES_texture_float) {
     // Extension must still be lost.
     var tex = gl.createTexture();
     gl.bindTexture(gl.TEXTURE_2D, tex);
     compareGLError(gl.INVALID_ENUM, "gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, null)");
     // Try re-enabling extension
     OES_texture_float = reGetExtensionAndTestForProperty(gl, "OES_texture_float", false);
     compareGLError(gl, gl.NO_ERROR, "gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, null)");
   }
 }

 function testOESVertexArrayObject() {
   if (OES_vertex_array_object) {
     // Extension must still be lost.
     assert_equals(OES_vertex_array_object.createVertexArrayOES(), null);
     // Try re-enabling extension

     old_OES_vertex_array_object = OES_vertex_array_object;
     OES_vertex_array_object = reGetExtensionAndTestForProperty(gl, "OES_vertex_array_object", false);
     assert_true(OES_vertex_array_object.createVertexArrayOES() != null);
     assert_true(old_OES_vertex_array_object.createVertexArrayOES() == null);
   }
 }

 function testExtensions() {
   testOESTextureFloat();
   testOESVertexArrayObject();
   // Only the WEBGL_lose_context extension should be the same object after context lost.
   new_WEBGL_lose_context = reGetExtensionAndTestForProperty(gl, "WEBGL_lose_context", true);
 }

 function testRestoredContext()
 {
     assert_false(contextRestoredEventFired);
     contextRestoredEventFired = true;
     assert_false(gl.isContextLost());
     assert_equals(gl.getError(), gl.NO_ERROR);
     testExtensions();
 }
 </script>
 </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	<script src="../../../resources/testharness.js"></script>
	<script src="../../../resources/testharnessreport.js"></script>
	<script src="./resources/webgl-test.js"></script>
	<script src="./resources/webgl-test-utils-full.js"></script>
	</head>
	<body>
	<script>
	var wtu = WebGLTestUtils;
	var canvas;
	var gl;
	var WEBGL_lose_context;
	var new_WEBGL_lose_context;
	var allowRestore;
	var contextLostEventFired;
	var contextRestoredEventFired;
	var OES_vertex_array_object;
	var old_OES_vertex_array_object;
	var OES_texture_float;
	var newExtension;

	async_test(function(t) {
	if (!setupTest()) {
	assert_true(false, 'Cannot initialize test');
	t.done();
	}

	canvas.addEventListener("webglcontextlost", t.step_func(function(e) {
	testLostContext(e);
	// restore the context after this event has exited.
	setTimeout(function() {
	// we didn't call prevent default so we should not be able to restore the context
	compareGLError(gl.INVALID_OPERATION, "WEBGL_lose_context.restoreContext()");
	testLosingAndRestoringContext(t);
	}, 0);
	}));
	canvas.addEventListener("webglcontextrestored", testShouldNotRestoreContext);
	allowRestore = false;
	contextLostEventFired = false;
	contextRestoredEventFired = false;

	testOriginalContext();
	WEBGL_lose_context.loseContext();
	// The context should be lost immediately.
	assert_true(gl.isContextLost());
	assert_equals(gl.getError(), gl.CONTEXT_LOST_WEBGL);
	assert_equals(gl.getError(), gl.NO_ERROR);
	// gl methods should be no-ops
	compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
	// but the event should not have been fired.
	assert_false(contextLostEventFired);
	}, 'Test WebGL context restoration with OffscreenCanvas');

	function compareGLError(glError, evalStr)
	{
	var exception;
	try {
	eval(evalStr);
	} catch (e) {
	exception = e;
	}
	if (exception) {
	assert_true(false, evalStr + " threw exception " + exception);
	} else {
	assert_equals(gl.getError(), glError);
	}
	}

	function setupTest()
	{
	canvas = new OffscreenCanvas(10, 10);
	gl = canvas.getContext('webgl');
	WEBGL_lose_context = getExtensionAndAddProperty(gl, "WEBGL_lose_context");
	if (!WEBGL_lose_context)
	return false;

	// Try to get a few extensions
	OES_vertex_array_object = getExtensionAndAddProperty(gl, "OES_vertex_array_object");
	OES_texture_float = getExtensionAndAddProperty(gl, "OES_texture_float");

	return true;
	}

	function getExtensionAndAddProperty(gl, name) {
	var ext = wtu.getExtensionWithKnownPrefixes(gl, name);
	if (ext) {
	ext.webglTestProperty = true;
	}
	return ext;
	}

	function reGetExtensionAndTestForProperty(gl, name, expectProperty) {
	newExtension = wtu.getExtensionWithKnownPrefixes(gl, name);
	// NOTE: while getting a extension after context lost/restored is allowed to fail
	// for the purpose the conformance tests it is not.
	//
	// Hypothetically the user can switch GPUs live. For example on Windows, install 2 GPUs,
	// then in the control panen enable 1, disable the others and visa versa. Since the GPUs
	// have different capabilities one or the other may not support a particlar extension.
	//
	// But, for the purpose of the conformance tests the context is expected to restore
	// on the same GPU and therefore the extensions that succeeded previously should
	// succeed on restore.
	assert_true(newExtension != null);
	if (expectProperty) {
	assert_true(newExtension.webglTestProperty === true);
	} else {
	assert_true(newExtension.webglTestProperty === undefined);
	}
	return newExtension;
	}

	function testLosingAndRestoringContext(t)
	{
	if (!setupTest()) {
	assert_true(false, 'Cannot initialize test');
	t.done();
	}

	canvas.addEventListener("webglcontextlost", function(e) {
	testLostContext(e);
	// restore the context after this event has exited.
	setTimeout(function() {
	compareGLError(gl.NO_ERROR, "WEBGL_lose_context.restoreContext()");
	// The context should still be lost. It will not get restored until the
	// webglrestorecontext event is fired.
	assert_true(gl.isContextLost());
	assert_equals(gl.getError(), gl.NO_ERROR);
	// gl methods should still be no-ops
	compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
	}, 0);
	});
	canvas.addEventListener("webglcontextrestored", t.step_func_done(function() {
	testRestoredContext();
	}));
	allowRestore = true;
	contextLostEventFired = false;
	contextRestoredEventFired = false;

	testOriginalContext();
	WEBGL_lose_context.loseContext();
	// The context should be lost immediately.
	assert_true(gl.isContextLost());
	assert_equals(gl.getError(), gl.CONTEXT_LOST_WEBGL);
	assert_equals(gl.getError(), gl.NO_ERROR);
	// gl methods should be no-ops
	compareGLError(gl.NO_ERROR, "gl.blendFunc(gl.TEXTURE_2D, gl.TEXTURE_CUBE_MAP)");
	// but the event should not have been fired.
	assert_false(contextLostEventFired);
	}

	function testOriginalContext()
	{
	assert_false(gl.isContextLost());
	assert_equals(gl.getError(), gl.NO_ERROR);
	}

	function testLostContext(e)
	{
	assert_false(contextLostEventFired);
	contextLostEventFired = true;
	assert_true(gl.isContextLost());
	assert_equals(gl.getError(), gl.NO_ERROR);
	if (allowRestore)
	e.preventDefault();
	}

	function testShouldNotRestoreContext(e)
	{
	assert_true(false, "Should not restore the context unless preventDefault is called on the context lost event");
	}

	function testOESTextureFloat() {
	if (OES_texture_float) {
	// Extension must still be lost.
	var tex = gl.createTexture();
	gl.bindTexture(gl.TEXTURE_2D, tex);
	compareGLError(gl.INVALID_ENUM, "gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, null)");
	// Try re-enabling extension
	OES_texture_float = reGetExtensionAndTestForProperty(gl, "OES_texture_float", false);
	compareGLError(gl, gl.NO_ERROR, "gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.FLOAT, null)");
	}
	}

	function testOESVertexArrayObject() {
	if (OES_vertex_array_object) {
	// Extension must still be lost.
	assert_equals(OES_vertex_array_object.createVertexArrayOES(), null);
	// Try re-enabling extension

	old_OES_vertex_array_object = OES_vertex_array_object;
	OES_vertex_array_object = reGetExtensionAndTestForProperty(gl, "OES_vertex_array_object", false);
	assert_true(OES_vertex_array_object.createVertexArrayOES() != null);
	assert_true(old_OES_vertex_array_object.createVertexArrayOES() == null);
	}
	}

	function testExtensions() {
	testOESTextureFloat();
	testOESVertexArrayObject();
	// Only the WEBGL_lose_context extension should be the same object after context lost.
	new_WEBGL_lose_context = reGetExtensionAndTestForProperty(gl, "WEBGL_lose_context", true);
	}

	function testRestoredContext()
	{
	assert_false(contextRestoredEventFired);
	contextRestoredEventFired = true;
	assert_false(gl.isContextLost());
	assert_equals(gl.getError(), gl.NO_ERROR);
	testExtensions();
	}
	</script>
	</body>
	</html>