vbo.cpp 3.34 KB
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/*******************************************************************************
* CGoGN: Combinatorial and Geometric modeling with Generic N-dimensional Maps  *
* version 0.1                                                                  *
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* Copyright (C) 2009-2011, IGG Team, LSIIT, University of Strasbourg           *
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*                                                                              *
* This library is free software; you can redistribute it and/or modify it      *
* under the terms of the GNU Lesser General Public License as published by the *
* Free Software Foundation; either version 2.1 of the License, or (at your     *
* option) any later version.                                                   *
*                                                                              *
* This library 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 Lesser General Public License  *
* for more details.                                                            *
*                                                                              *
* You should have received a copy of the GNU Lesser General Public License     *
* along with this library; if not, write to the Free Software Foundation,      *
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.           *
*                                                                              *
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* Web site: http://cgogn.u-strasbg.fr/                                         *
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* Contact information: cgogn@unistra.fr                                        *
*                                                                              *
*******************************************************************************/

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#include "Utils/vbo.h"
#include "Utils/GLSLShader.h"
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#include <stdio.h>
#include <string.h>
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namespace CGoGN
{
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namespace Utils
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{

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VBO::VBO() : m_nbElts(0), m_lock(false)
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{
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	glGenBuffers(1, &m_id);
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	m_refs.reserve(4);
}
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VBO::VBO(const VBO& vbo) :
	m_data_size(vbo.m_data_size),
	m_nbElts(vbo.m_nbElts),
	m_lock(false)
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{
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	unsigned int nbbytes =  sizeof(float) * m_data_size * m_nbElts;
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	glGenBuffers(1, &m_id);
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	vbo.bind();
	void* src = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);

	bind();
	glBufferData(GL_ARRAY_BUFFER, nbbytes, src, GL_STREAM_DRAW);

	vbo.bind();
	glUnmapBuffer(GL_ARRAY_BUFFER);
}

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VBO::~VBO()
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{
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	if (m_lock)
		releasePtr();
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	glDeleteBuffers(1, &m_id);
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}

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void VBO::sameAllocSameBufferSize(const VBO& vbo)
{
	m_data_size = vbo.m_data_size;
	m_nbElts = vbo.m_nbElts;
	unsigned int nbbytes =  sizeof(float) * m_data_size * m_nbElts;
	bind();
	glBufferData(GL_ARRAY_BUFFER, nbbytes, NULL, GL_STREAM_DRAW);
}

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void* VBO::lockPtr()
{
	if (m_lock)
	{
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		CGoGNerr <<" Error already locked VBO"<< CGoGNendl;
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		return NULL;
	}

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	m_lock = true;
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	glBindBuffer(GL_ARRAY_BUFFER, m_id);
	return glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
}

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const void* VBO::lockPtr() const
{
	if (m_lock)
	{
		CGoGNerr <<" Error already locked VBO"<< CGoGNendl;
		return NULL;
	}

	m_lock = true;
	glBindBuffer(GL_ARRAY_BUFFER, m_id);
	return glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
}

void VBO::releasePtr() const
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{
	glBindBuffer(GL_ARRAY_BUFFER, m_id);
	glUnmapBuffer(GL_ARRAY_BUFFER);
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	m_lock = false;
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}

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} // namespace Utils
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} // namespace CGoGN