27847dedd9
git-svn-id: http://skia.googlecode.com/svn/trunk@832 2bbb7eff-a529-9590-31e7-b0007b416f81
117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrGeometryBuffer_DEFINED
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#define GrGeometryBuffer_DEFINED
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#include "GrRefCnt.h"
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/**
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* Parent class for vertex and index buffers
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*/
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class GrGeometryBuffer : public GrRefCnt {
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public:
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virtual ~GrGeometryBuffer() {}
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/**
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* Retrieves the size of the buffer
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*
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* @return the size of the buffer in bytes
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*/
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size_t size() const { return fSizeInBytes; }
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/**
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*Retrieves whether the buffer was created with the dynamic flag
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*
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* @return true if the buffer was created with the dynamic flag
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*/
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bool dynamic() const { return fDynamic; }
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/**
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* Indicates that GPU context in which this veretx buffer was created is
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* destroyed and that Ganesh should not attempt to free the buffer in the
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* underlying API.
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*/
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virtual void abandon() = 0;
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/**
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* Locks the buffer to be written by the CPU.
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*
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* The previous content of the buffer is invalidated. It is an error
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* to draw from the buffer while it is locked. It is an error to call lock
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* on an already locked buffer.
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*
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* @return a pointer to the data or NULL if the lock fails.
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*/
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virtual void* lock() = 0;
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/**
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* Returns the same ptr that lock() returned at time of lock or NULL if the
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* is not locked.
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*
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* @return ptr to locked buffer data or undefined if buffer is not locked.
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*/
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virtual void* lockPtr() const = 0;
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/**
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* Unlocks the buffer.
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*
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* The pointer returned by the previous lock call will no longer be valid.
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*/
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virtual void unlock() = 0;
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/**
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Queries whether the buffer has been locked.
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@return true if the buffer is locked, false otherwise.
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*/
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virtual bool isLocked() const = 0;
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/**
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* Updates the buffer data.
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*
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* The size of the buffer will be preserved. The src data will be
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* placed at the begining of the buffer and any remaining contents will
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* be undefined.
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*
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* @return returns true if the update succeeds, false otherwise.
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*/
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virtual bool updateData(const void* src, size_t srcSizeInBytes) = 0;
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/**
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* Updates a portion of the buffer data.
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*
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* The contents of the buffer outside the update region are preserved.
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*
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* @return returns true if the update succeeds, false otherwise.
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*/
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virtual bool updateSubData(const void* src,
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size_t srcSizeInBytes,
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size_t offset) = 0;
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protected:
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GrGeometryBuffer(size_t sizeInBytes, bool dynamic) :
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fSizeInBytes(sizeInBytes),
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fDynamic(dynamic) {}
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private:
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size_t fSizeInBytes;
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bool fDynamic;
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typedef GrRefCnt INHERITED;
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};
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#endif
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