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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTransferBuffer_DEFINED
#define GrTransferBuffer_DEFINED
#include "GrGpuResource.h"
class GrTransferBuffer : public GrGpuResource {
public:
/**
* Maps the buffer to be written by the CPU.
*
* The previous content of the buffer is invalidated. It is an error
* to transfer to or from the buffer while it is mapped. It is an error to
* call map on an already mapped buffer. Must be matched by an unmap() call.
* Currently only one map at a time is supported (no nesting of map/unmap).
*
* Note that buffer mapping does not go through GrContext and therefore is
* not serialized with other operations.
*
* @return a pointer to the data or nullptr if the map fails.
*/
void* map() { return (fMapPtr = this->onMap()); }
/**
* Unmaps the buffer.
*
* The pointer returned by the previous map call will no longer be valid.
*/
void unmap() {
SkASSERT(fMapPtr);
this->onUnmap();
fMapPtr = nullptr;
}
/**
* Returns the same ptr that map() returned at time of map or nullptr if the
* is not mapped.
*
* @return ptr to mapped buffer data or nullptr if buffer is not mapped.
*/
void* mapPtr() const { return fMapPtr; }
/**
Queries whether the buffer has been mapped.
@return true if the buffer is mapped, false otherwise.
*/
bool isMapped() const { return SkToBool(fMapPtr); }
protected:
GrTransferBuffer(GrGpu* gpu, size_t gpuMemorySize)
: INHERITED(gpu, kUncached_LifeCycle)
, fGpuMemorySize(gpuMemorySize) {
}
private:
virtual size_t onGpuMemorySize() const { return fGpuMemorySize; }
virtual void* onMap() = 0;
virtual void onUnmap() = 0;
void* fMapPtr;
size_t fGpuMemorySize;
typedef GrGpuResource INHERITED;
};
#endif
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