1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef GrGLBufferImpl_DEFINED
9#define GrGLBufferImpl_DEFINED
10
11#include "SkTypes.h"
12#include "gl/GrGLFunctions.h"
13
14class GrGpuGL;
15
16/**
17 * This class serves as the implementation of GrGL*Buffer classes. It was written to avoid code
18 * duplication in those classes.
19 */
20class GrGLBufferImpl : SkNoncopyable {
21public:
22    struct Desc {
23        bool        fIsWrapped;
24        GrGLuint    fID;            // set to 0 to indicate buffer is CPU-backed and not a VBO.
25        size_t      fSizeInBytes;
26        bool        fDynamic;
27    };
28
29    GrGLBufferImpl(GrGpuGL*, const Desc&, GrGLenum bufferType);
30    ~GrGLBufferImpl() {
31        // either release or abandon should have been called by the owner of this object.
32        SkASSERT(0 == fDesc.fID);
33    }
34
35    void abandon();
36    void release(GrGpuGL* gpu);
37
38    GrGLuint bufferID() const { return fDesc.fID; }
39    size_t baseOffset() const { return reinterpret_cast<size_t>(fCPUData); }
40
41    void bind(GrGpuGL* gpu) const;
42
43    void* map(GrGpuGL* gpu);
44    void unmap(GrGpuGL* gpu);
45    bool isMapped() const;
46    bool updateData(GrGpuGL* gpu, const void* src, size_t srcSizeInBytes);
47
48private:
49    void validate() const;
50
51    Desc         fDesc;
52    GrGLenum     fBufferType; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER
53    void*        fCPUData;
54    void*        fMapPtr;
55    size_t       fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
56                                     // smaller or larger than the size in fDesc.
57
58    typedef SkNoncopyable INHERITED;
59};
60
61#endif
62