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 
14 class GrGLGpu;
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  */
20 class GrGLBufferImpl : SkNoncopyable {
21 public:
22     struct Desc {
23         GrGLuint    fID;            // set to 0 to indicate buffer is CPU-backed and not a VBO.
24         size_t      fSizeInBytes;
25         bool        fDynamic;
26     };
27 
28     GrGLBufferImpl(GrGLGpu*, const Desc&, GrGLenum bufferType);
~GrGLBufferImpl()29     ~GrGLBufferImpl() {
30         // either release or abandon should have been called by the owner of this object.
31         SkASSERT(0 == fDesc.fID);
32     }
33 
34     void abandon();
35     void release(GrGLGpu* gpu);
36 
bufferID()37     GrGLuint bufferID() const { return fDesc.fID; }
baseOffset()38     size_t baseOffset() const { return reinterpret_cast<size_t>(fCPUData); }
39 
40     void bind(GrGLGpu* gpu) const;
41 
42     void* map(GrGLGpu* gpu);
43     void unmap(GrGLGpu* gpu);
44     bool isMapped() const;
45     bool updateData(GrGLGpu* gpu, const void* src, size_t srcSizeInBytes);
46 
47 private:
48     void validate() const;
49 
50     Desc         fDesc;
51     GrGLenum     fBufferType; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER
52     void*        fCPUData;
53     void*        fMapPtr;
54     size_t       fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
55                                      // smaller or larger than the size in fDesc.
56 
57     typedef SkNoncopyable INHERITED;
58 };
59 
60 #endif
61