//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// Buffer.h: Defines the gl::Buffer class, representing storage of vertex and/or
// index data. Implements GL buffer objects and related functionality.
// [OpenGL ES 2.0.24] section 2.9 page 21.

#ifndef LIBGLESV2_BUFFER_H_
#define LIBGLESV2_BUFFER_H_

#include "common/angleutils.h"
#include "common/RefCountObject.h"
#include "libGLESv2/renderer/IndexRangeCache.h"

namespace rx
{
class Renderer;
class BufferStorage;
class StaticIndexBufferInterface;
class StaticVertexBufferInterface;
};

namespace gl
{

class Buffer : public RefCountObject
{
  public:
    Buffer(rx::Renderer *renderer, GLuint id);

    virtual ~Buffer();

    void bufferData(const void *data, GLsizeiptr size, GLenum usage);
    void bufferSubData(const void *data, GLsizeiptr size, GLintptr offset);
    void copyBufferSubData(Buffer* source, GLintptr sourceOffset, GLintptr destOffset, GLsizeiptr size);
    GLvoid *mapRange(GLintptr offset, GLsizeiptr length, GLbitfield access);
    void unmap();

    GLenum usage() const;
    GLint accessFlags() const;
    GLboolean mapped() const;
    GLvoid *mapPointer() const;
    GLint64 mapOffset() const;
    GLint64 mapLength() const;

    rx::BufferStorage *getStorage() const;
    GLint64 size() const;

    void markTransformFeedbackUsage();

    rx::StaticVertexBufferInterface *getStaticVertexBuffer();
    rx::StaticIndexBufferInterface *getStaticIndexBuffer();
    void invalidateStaticData();
    void promoteStaticUsage(int dataSize);

    rx::IndexRangeCache *getIndexRangeCache();

  private:
    DISALLOW_COPY_AND_ASSIGN(Buffer);

    rx::Renderer *mRenderer;
    GLenum mUsage;
    GLint mAccessFlags;
    GLboolean mMapped;
    GLvoid *mMapPointer;
    GLint64 mMapOffset;
    GLint64 mMapLength;

    rx::BufferStorage *mBufferStorage;

    rx::IndexRangeCache mIndexRangeCache;

    rx::StaticVertexBufferInterface *mStaticVertexBuffer;
    rx::StaticIndexBufferInterface *mStaticIndexBuffer;
    unsigned int mUnmodifiedDataUse;
};

}

#endif   // LIBGLESV2_BUFFER_H_