Implement WEBGL_shared_resources

Source/core/html/canvas/WebGLSharedResources.cpp

Index: Source/core/html/canvas/WebGLSharedResources.cpp
diff --git a/Source/core/html/canvas/WebGLSharedResources.cpp b/Source/core/html/canvas/WebGLSharedResources.cpp
new file mode 100644
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+++ b/Source/core/html/canvas/WebGLSharedResources.cpp
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+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "core/html/canvas/WebGLSharedResources.h"
+
+#include "core/html/canvas/WebGLAcquireSharedResourceCallback.h"
+#include "core/html/canvas/WebGLContextGroup.h"
+#include "core/html/canvas/WebGLRenderingContext.h"
+#include "core/html/canvas/WebGLShareGroup.h"
+#include "core/platform/graphics/Extensions3D.h"
+
+namespace WebCore {
+
+WebGLSharedResources::WebGLSharedResources(WebGLRenderingContext* context)
+    : WebGLExtension(context)
+    , m_shareGroup(WebGLShareGroup::create(context->contextGroup()))
+{
+}
+
+WebGLSharedResources::~WebGLSharedResources()
+{
+}
+
+bool WebGLSharedResources::intToAcquireMode(unsigned value, WebGLSharedObject::AcquireMode* mode)
+{
+    switch (value) {
+    case 0:
+        *mode = WebGLSharedObject::Unacquired;
+        return true;
+    case 1:
+        *mode = WebGLSharedObject::ReadOnly;
+        return true;
+    case 4:
+        *mode = WebGLSharedObject::Exclusive;
+        return true;
+    default:
+        return false;
+    }
+}
+
+WebGLExtension::ExtensionName WebGLSharedResources::getName() const
+{
+    return WebGLSharedResourcesName;
+}
+
+void WebGLSharedResources::lose(bool force)
+{
+    // WebGLSharedResouces is not lost because it would cause too many hard to work around race considtions.
+    // It is not actually manipulating GL resources. It is just passing references.
+    if (force)
+        WebGLExtension::lose(true);
+}
+
+PassRefPtr<WebGLSharedResources> WebGLSharedResources::create(WebGLRenderingContext* context)
+{
+    return adoptRef(new WebGLSharedResources(context));
+}
+
+long WebGLSharedResources::acquireSharedResource(WebGLSharedObject* object, unsigned desiredMode, PassRefPtr<WebGLAcquireSharedResourceCallback> callback, ExceptionCode& ec)
+{
+    WebGLSharedObject::AcquireMode mode;
+    if (!intToAcquireMode(desiredMode, &mode)) {
+        m_context->synthesizeGLError(GraphicsContext3D::INVALID_ENUM, "acquireSharedResource", "unknown mode");
+        return 0;
+    }
+    return m_context->acquireSharedResource(object, mode, callback, ec);
+}
+
+void WebGLSharedResources::releaseSharedResource(WebGLSharedObject* object, ExceptionCode& ec)
+{
+    m_context->releaseSharedResource(object, ec);
+}
+
+void WebGLSharedResources::cancelAcquireSharedResource(long id)
+{
+    m_context->cancelAcquireSharedResource(id);
+}
+
+bool WebGLSharedResources::supported(WebGLRenderingContext*)
+{
+    return true;
+}
+
+PassRefPtr<WebGLShareGroup> WebGLSharedResources::group() const
+{
+    return m_shareGroup;
+}
+
+const char* WebGLSharedResources::getExtensionName()
+{
+    return "WEBGL_shared_resources";
+}
+
+} // namespace WebCore