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/*
* Copyright (C) 2010 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 APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS 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.
*/
#ifndef WebGLExtension_h
#define WebGLExtension_h
#include "bindings/core/v8/ScriptWrappable.h"
#include "core/html/HTMLCanvasElement.h"
#include "modules/webgl/WebGLExtensionName.h"
#include "modules/webgl/WebGLRenderingContextBase.h"
#include "platform/heap/Handle.h"
namespace blink {
class WebGLExtensionScopedContext final {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(WebGLExtensionScopedContext);
public:
explicit WebGLExtensionScopedContext(WebGLExtension*);
~WebGLExtensionScopedContext();
bool isLost() const { return !m_context; }
WebGLRenderingContextBase* context() const { return m_context.get(); }
private:
Member<WebGLRenderingContextBase> m_context;
};
class WebGLExtension : public GarbageCollected<WebGLExtension>,
public ScriptWrappable {
WTF_MAKE_NONCOPYABLE(WebGLExtension);
public:
virtual WebGLExtensionName name() const = 0;
// Lose this extension. Passing true = force loss. Some extensions
// like WEBGL_lose_context are not normally lost when the context
// is lost but must be lost when destroying their WebGLRenderingContextBase.
virtual void lose(bool) { m_context = nullptr; }
bool isLost() { return !m_context; }
DECLARE_VIRTUAL_TRACE();
// For use by V8 bindings only.
HTMLCanvasElement* canvas() const {
if (m_context)
return m_context->canvas();
return nullptr;
}
protected:
explicit WebGLExtension(WebGLRenderingContextBase*);
private:
friend WebGLExtensionScopedContext;
WeakMember<WebGLRenderingContextBase> m_context;
};
} // namespace blink
#endif // WebGLExtension_h
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