0255a5d2fe
https://codereview.chromium.org/39973004/ git-svn-id: http://skia.googlecode.com/svn/trunk@11940 2bbb7eff-a529-9590-31e7-b0007b416f81
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrResource_DEFINED
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#define GrResource_DEFINED
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#include "SkRefCnt.h"
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#include "SkTInternalLList.h"
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class GrGpu;
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class GrContext;
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class GrResourceEntry;
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/**
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* Base class for the GPU resources created by a GrContext.
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*/
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class GrResource : public SkRefCnt {
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public:
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SK_DECLARE_INST_COUNT(GrResource)
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/**
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* Frees the resource in the underlying 3D API. It must be safe to call this
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* when the resource has been previously abandoned.
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*/
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void release();
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/**
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* Removes references to objects in the underlying 3D API without freeing
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* them. Used when the API context has been torn down before the GrContext.
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*/
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void abandon();
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/**
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* Tests whether a resource has been abandoned or released. All resources
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* will be in this state after their creating GrContext is destroyed or has
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* contextLost called. It's up to the client to test isValid() before
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* attempting to use a resource if it holds refs on resources across
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* ~GrContext, freeResources with the force flag, or contextLost.
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*
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* @return true if the resource has been released or abandoned,
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* false otherwise.
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*/
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bool isValid() const { return NULL != fGpu; }
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/**
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* Retrieves the size of the object in GPU memory. This is approximate since
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* we aren't aware of additional padding or copies made by the driver.
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*
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* @return the size of the buffer in bytes
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*/
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virtual size_t sizeInBytes() const = 0;
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/**
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* Retrieves the context that owns the resource. Note that it is possible
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* for this to return NULL. When resources have been release()ed or
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* abandon()ed they no longer have an owning context. Destroying a
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* GrContext automatically releases all its resources.
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*/
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const GrContext* getContext() const;
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GrContext* getContext();
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void setCacheEntry(GrResourceEntry* cacheEntry) { fCacheEntry = cacheEntry; }
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GrResourceEntry* getCacheEntry() { return fCacheEntry; }
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void incDeferredRefCount() const { SkASSERT(fDeferredRefCount >= 0); ++fDeferredRefCount; }
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void decDeferredRefCount() const { SkASSERT(fDeferredRefCount > 0); --fDeferredRefCount; }
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int getDeferredRefCount() const { return fDeferredRefCount; }
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protected:
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/**
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* isWrapped indicates we have wrapped a client-created backend resource in a GrResource. If it
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* is true then the client is responsible for the lifetime of the underlying backend resource.
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* Otherwise, our onRelease() should free the resource.
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*/
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GrResource(GrGpu* gpu, bool isWrapped);
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virtual ~GrResource();
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GrGpu* getGpu() const { return fGpu; }
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// Derived classes should always call their parent class' onRelease
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// and onAbandon methods in their overrides.
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virtual void onRelease() {};
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virtual void onAbandon() {};
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bool isInCache() const { return NULL != fCacheEntry; }
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bool isWrapped() const { return kWrapped_Flag & fFlags; }
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private:
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#ifdef SK_DEBUG
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friend class GrGpu; // for assert in GrGpu to access getGpu
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#endif
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// We're in an internal doubly linked list
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SK_DECLARE_INTERNAL_LLIST_INTERFACE(GrResource);
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GrGpu* fGpu; // not reffed. The GrGpu can be deleted while there
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// are still live GrResources. It will call
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// release() on all such resources in its
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// destructor.
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GrResourceEntry* fCacheEntry; // NULL if not in cache
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mutable int fDeferredRefCount; // How many references in deferred drawing buffers.
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enum Flags {
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kWrapped_Flag = 0x1,
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};
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uint32_t fFlags;
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typedef SkRefCnt INHERITED;
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};
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#endif
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