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      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/GrGLTypes.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     enum Usage {
     23         kStaticDraw_Usage = 0,
     24         kDynamicDraw_Usage,
     25         kStreamDraw_Usage,
     26         kStreamRead_Usage,
     27 
     28         kLast_Usage = kStreamRead_Usage
     29     };
     30     static const int kUsageCount = kLast_Usage + 1;
     31 
     32     struct Desc {
     33         GrGLuint    fID;            // set to 0 to indicate buffer is CPU-backed and not a VBO.
     34         size_t      fSizeInBytes;
     35         Usage       fUsage;
     36     };
     37 
     38     GrGLBufferImpl(GrGLGpu*, const Desc&, GrGLenum bufferType);
     39     ~GrGLBufferImpl() {
     40         // either release or abandon should have been called by the owner of this object.
     41         SkASSERT(0 == fDesc.fID);
     42     }
     43 
     44     void abandon();
     45     void release(GrGLGpu* gpu);
     46 
     47     GrGLuint bufferID() const { return fDesc.fID; }
     48     size_t baseOffset() const { return reinterpret_cast<size_t>(fCPUData); }
     49     GrGLenum bufferType() const { return fBufferType; }
     50 
     51     void* map(GrGLGpu* gpu);
     52     void unmap(GrGLGpu* gpu);
     53     bool isMapped() const;
     54     bool updateData(GrGLGpu* gpu, const void* src, size_t srcSizeInBytes);
     55 
     56 private:
     57     void validate() const;
     58 
     59     Desc         fDesc;
     60     GrGLenum     fBufferType; // GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER, e.g.
     61     void*        fCPUData;
     62     void*        fMapPtr;
     63     size_t       fGLSizeInBytes;     // In certain cases we make the size of the GL buffer object
     64                                      // smaller or larger than the size in fDesc.
     65 
     66     typedef SkNoncopyable INHERITED;
     67 };
     68 
     69 #endif
     70