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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Allocate and destroy CVertexBuffers
*/
#ifndef INCLUDED_VERTEXBUFFERMANAGER
#define INCLUDED_VERTEXBUFFERMANAGER
#include "VertexBuffer.h"
///////////////////////////////////////////////////////////////////////////////
// CVertexBufferManager: owner object for CVertexBuffer objects; acts as
// 'front end' for their allocation and destruction
class CVertexBufferManager
{
public:
/**
* Try to allocate a vertex buffer of the given size and type.
*
* @param vertexSize size of each vertex in the buffer
* @param numVertices number of vertices in the buffer
* @param usage GL_STATIC_DRAW, GL_DYNAMIC_DRAW, GL_STREAM_DRAW
* @param target typically GL_ARRAY_BUFFER or GL_ELEMENT_ARRAY_BUFFER
* @param backingStore if usage is STATIC, this is NULL; else for DYNAMIC/STREAM,
* this must be a copy of the vertex data that remains valid for the
* lifetime of the VBChunk
* @return chunk, or NULL if no free chunks available
*/
CVertexBuffer::VBChunk* Allocate(size_t vertexSize, size_t numVertices, GLenum usage, GLenum target, void* backingStore = NULL);
/// Returns the given @p chunk to its owning buffer
void Release(CVertexBuffer::VBChunk* chunk);
/// Returns a list of all buffers
const std::list<CVertexBuffer*>& GetBufferList() const { return m_Buffers; }
size_t GetBytesReserved();
size_t GetBytesAllocated();
/// Explicit shutdown of the vertex buffer subsystem; releases all currently-allocated buffers.
void Shutdown();
private:
/// List of all known vertex buffers
std::list<CVertexBuffer*> m_Buffers;
};
extern CVertexBufferManager g_VBMan;
#endif
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