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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrResource_DEFINED
#define GrResource_DEFINED
#include "GrRefCnt.h"
class GrGpu;
class GrContext;
/**
* Base class for the GPU resources created by a GrContext.
*/
class GrResource : public GrRefCnt {
public:
/**
* Frees the resource in the underlying 3D API. It must be safe to call this
* when the resource has been previously abandoned.
*/
void release();
/**
* Removes references to objects in the underlying 3D API without freeing
* them. Used when the API context has been torn down before the GrContext.
*/
void abandon();
/**
* Tests whether a resource has been abandoned or released. All resources
* will be in this state after their creating GrContext is destroyed or has
* contextLost called. It's up to the client to test isValid() before
* attempting to use a resource if it holds refs on resources across
* ~GrContext, freeResources with the force flag, or contextLost.
*
* @return true if the resource has been released or abandoned,
* false otherwise.
*/
bool isValid() const { return NULL != fGpu; }
/**
* Retrieves the size of the object in GPU memory. This is approximate since
* we aren't aware of additional padding or copies made by the driver.
*
* @return the size of the buffer in bytes
*/
virtual size_t sizeInBytes() const = 0;
/**
* Retrieves the context that owns the resource. Note that it is possible
* for this to return NULL. When resources have been release()ed or
* abandon()ed they no longer have an owning context. Destroying a
* GrContext automatically releases all its resources.
*/
const GrContext* getContext() const;
GrContext* getContext();
protected:
explicit GrResource(GrGpu* gpu);
virtual ~GrResource();
GrGpu* getGpu() const { return fGpu; }
virtual void onRelease() = 0;
virtual void onAbandon() = 0;
private:
friend class GrGpu; // GrGpu manages list of resources.
GrGpu* fGpu; // not reffed. The GrGpu can be deleted while there
// are still live GrResources. It will call
// release() on all such resources in its
// destructor.
GrResource* fNext; // dl-list of resources per-GrGpu
GrResource* fPrevious;
typedef GrRefCnt INHERITED;
};
#endif
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