Consolidate GPU buffer implementations

src/gpu/gl/GrGLBufferImpl.h

-/*
- * 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