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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLBufferImpl_DEFINED
#define GrGLBufferImpl_DEFINED
#include "SkTypes.h"
#include "gl/GrGLTypes.h"
class GrGLGpu;
/**
* This class serves as the implementation of GrGL*Buffer classes. It was written to avoid code
* duplication in those classes.
*/
class GrGLBufferImpl : SkNoncopyable {
public:
enum Usage {
kStaticDraw_Usage = 0,
kDynamicDraw_Usage,
kStreamDraw_Usage,
kStreamRead_Usage,
kLast_Usage = kStreamRead_Usage
};
static const int kUsageCount = kLast_Usage + 1;
struct Desc {
GrGLuint fID; // set to 0 to indicate buffer is CPU-backed and not a VBO.
size_t fSizeInBytes;
Usage fUsage;
};
GrGLBufferImpl(GrGLGpu*, const Desc&, GrGLenum bufferType);
~GrGLBufferImpl() {
// either release or abandon should have been called by the owner of this object.
SkASSERT(0 == fDesc.fID);
}
void abandon();
void release(GrGLGpu* gpu);
GrGLuint bufferID() const { return fDesc.fID; }
size_t baseOffset() const { return reinterpret_cast<size_t>(fCPUData); }
GrGLenum bufferType() const { return fBufferType; }
void* map(GrGLGpu* gpu);
void unmap(GrGLGpu* gpu);
bool isMapped() const;
bool updateData(GrGLGpu* gpu, const void* src, size_t srcSizeInBytes);
private:
void validate() const;
Desc fDesc;
GrGLenum fBufferType; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER, e.g.
void* fCPUData;
void* fMapPtr;
size_t fGLSizeInBytes; // In certain cases we make the size of the GL buffer object
// smaller or larger than the size in fDesc.
typedef SkNoncopyable INHERITED;
};
#endif
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