glc_meshdata.cpp

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 Version 2.0.0 Beta 1, packaged on April 2010.

 http://glc-lib.sourceforge.net

 GLC-lib 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.

 GLC-lib 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 GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*****************************************************************************/


#include "glc_meshdata.h"
#include "../glc_state.h"

// Class chunk id
quint32 GLC_MeshData::m_ChunkId= 0xA704;

// Default constructor
GLC_MeshData::GLC_MeshData()
: m_VboId(0)
, m_Positions()
, m_Normals()
, m_Texels()
, m_Colors()
, m_NormalVboId(0)
, m_TexelVboId(0)
, m_ColorVboId(0)
, m_LodList()
, m_PositionSize(0)
, m_TexelsSize(0)
, m_ColorSize(0)
{

}

// Copy constructor
GLC_MeshData::GLC_MeshData(const GLC_MeshData& meshData)
: m_VboId(0)
, m_Positions(meshData.positionVector())
, m_Normals(meshData.normalVector())
, m_Texels(meshData.texelVector())
, m_Colors(meshData.colorVector())
, m_NormalVboId(0)
, m_TexelVboId(0)
, m_ColorVboId(0)
, m_LodList()
, m_PositionSize(meshData.m_PositionSize)
, m_TexelsSize(meshData.m_TexelsSize)
, m_ColorSize(meshData.m_ColorSize)
{
        // Copy meshData LOD list
        const int size= meshData.m_LodList.size();
        for (int i= 0; i < size; ++i)
        {
                m_LodList.append(new GLC_Lod(*meshData.m_LodList.at(i)));
        }
}

// Overload "=" operator
GLC_MeshData& GLC_MeshData::operator=(const GLC_MeshData& meshData)
{
        if (this != &meshData)
        {
                // Clear the content of the mesh Data
                clear();

                // Copy mesh Data members
                m_Positions= meshData.positionVector();
                m_Normals= meshData.normalVector();
                m_Texels= meshData.texelVector();
                m_Colors= meshData.colorVector();
                m_PositionSize= meshData.m_PositionSize;
                m_TexelsSize= meshData.m_TexelsSize;
                m_ColorSize= meshData.m_ColorSize;

                // Copy meshData LOD list
                const int size= meshData.m_LodList.size();
                for (int i= 0; i < size; ++i)
                {
                        m_LodList.append(new GLC_Lod(*meshData.m_LodList.at(i)));
                }
        }
        return *this;
}

GLC_MeshData::~GLC_MeshData()
{
        clear();
}
// Get Functions
// Return the class Chunk ID
quint32 GLC_MeshData::chunckID()
{
        return m_ChunkId;
}

// Return the Position Vector
GLfloatVector GLC_MeshData::positionVector() const
{
        if (0 != m_VboId)
        {
                // VBO created get data from VBO
                const int sizeOfVbo= m_PositionSize;
                const GLsizeiptr dataSize= sizeOfVbo * sizeof(float);
                GLfloatVector positionVector(sizeOfVbo);

                glBindBuffer(GL_ARRAY_BUFFER, m_VboId);
                GLvoid* pVbo = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
                memcpy(positionVector.data(), pVbo, dataSize);
                glUnmapBuffer(GL_ARRAY_BUFFER);
                glBindBuffer(GL_ARRAY_BUFFER, 0);
                return positionVector;
        }
        else
        {
                return m_Positions;
        }
}

// Return the normal Vector
GLfloatVector GLC_MeshData::normalVector() const
{
        if (0 != m_NormalVboId)
        {
                // VBO created get data from VBO
                const int sizeOfVbo= m_PositionSize;
                const GLsizeiptr dataSize= sizeOfVbo * sizeof(GLfloat);
                GLfloatVector normalVector(sizeOfVbo);

                glBindBuffer(GL_ARRAY_BUFFER, m_NormalVboId);
                GLvoid* pVbo = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
                memcpy(normalVector.data(), pVbo, dataSize);
                glUnmapBuffer(GL_ARRAY_BUFFER);
                glBindBuffer(GL_ARRAY_BUFFER, 0);
                return normalVector;
        }
        else
        {
                return m_Normals;
        }
}

// Return the texel Vector
GLfloatVector GLC_MeshData::texelVector() const
{
        if (0 != m_TexelVboId)
        {
                // VBO created get data from VBO
                const int sizeOfVbo= m_TexelsSize;
                const GLsizeiptr dataSize= sizeOfVbo * sizeof(GLfloat);
                GLfloatVector texelVector(sizeOfVbo);

                glBindBuffer(GL_ARRAY_BUFFER, m_TexelVboId);
                GLvoid* pVbo = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
                memcpy(texelVector.data(), pVbo, dataSize);
                glUnmapBuffer(GL_ARRAY_BUFFER);
                glBindBuffer(GL_ARRAY_BUFFER, 0);
                return texelVector;
        }
        else
        {
                return m_Texels;
        }
}

// Return the color Vector
GLfloatVector GLC_MeshData::colorVector() const
{
        if (0 != m_ColorVboId)
        {
                // VBO created get data from VBO
                const int sizeOfVbo= m_ColorSize;
                const GLsizeiptr dataSize= sizeOfVbo * sizeof(GLfloat);
                GLfloatVector normalVector(sizeOfVbo);

                glBindBuffer(GL_ARRAY_BUFFER, m_ColorVboId);
                GLvoid* pVbo = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_ONLY);
                memcpy(normalVector.data(), pVbo, dataSize);
                glUnmapBuffer(GL_ARRAY_BUFFER);
                glBindBuffer(GL_ARRAY_BUFFER, 0);
                return normalVector;
        }
        else
        {
                return m_Colors;
        }
}

// Set Functions

// The mesh wich use the data is finished
void GLC_MeshData::finishVbo()
{
        m_PositionSize= m_Positions.size();
        m_Positions.clear();
        m_Normals.clear();
        m_TexelsSize= m_Texels.size();
        m_Texels.clear();
        m_ColorSize= m_Colors.size();
        m_Colors.clear();

        // Finish the LOD
        const int size= m_LodList.size();
        for (int i= 0; i < size; ++i)
        {
                m_LodList[i]->finishVbo();
        }
}

// If the there is more than 2 LOD Swap the first and last
void GLC_MeshData::finishLod()
{
        // PLace the master LOD at the beginning of the list
        const int size= m_LodList.size();
        if (size > 1)
        {
                GLC_Lod* PMasterLod= m_LodList.at(size - 1);
                m_LodList.removeAt(size - 1);
                m_LodList.prepend(PMasterLod);
        }
}

// Clear the content of the meshData and makes it empty
void GLC_MeshData::clear()
{
        m_Positions.clear();
        m_Normals.clear();
        m_Texels.clear();
        m_PositionSize= 0;
        m_TexelsSize= 0;

        // Delete Main Vbo ID
        if (0 != m_VboId)
        {
                glDeleteBuffers(1, &m_VboId);
                m_VboId= 0;
        }

        // Delete Normal VBO
        if (0 != m_NormalVboId)
        {
                glDeleteBuffers(1, &m_NormalVboId);
                m_NormalVboId= 0;
        }

        // Delete Texel VBO
        if (0 != m_TexelVboId)
        {
                glDeleteBuffers(1, &m_TexelVboId);
                m_TexelVboId= 0;
        }

        const int size= m_LodList.size();
        for (int i= 0; i < size; ++i)
        {
                delete m_LodList.at(i);
        }
        m_LodList.clear();
}

// OpenGL Functions
// Vbo creation
void GLC_MeshData::createVBOs()
{
        // Create position VBO
        if (0 == m_VboId)
        {
                glGenBuffers(1, &m_VboId);
                glGenBuffers(1, &m_NormalVboId);

                // Create Texel VBO
                if (0 == m_TexelVboId && !m_Texels.isEmpty())
                {
                        glGenBuffers(1, &m_TexelVboId);
                }

                // Create Color VBO
                if (0 == m_ColorVboId && !m_Colors.isEmpty())
                {
                        glGenBuffers(1, &m_ColorVboId);
                }

                const int size= m_LodList.size();
                for (int i= 0; i < size; ++i)
                {
                        m_LodList.at(i)->createIBO();
                }
        }
}

// Ibo Usage
bool GLC_MeshData::useVBO(bool use, GLC_MeshData::VboType type)
{
        bool result= true;
        if (use)
        {
                // Chose the right VBO
                if (type == GLC_MeshData::GLC_Vertex)
                {
                        glBindBuffer(GL_ARRAY_BUFFER, m_VboId);
                }
                else if (type == GLC_MeshData::GLC_Normal)
                {
                        glBindBuffer(GL_ARRAY_BUFFER, m_NormalVboId);
                }
                else if ((type == GLC_MeshData::GLC_Texel) && (0 != m_TexelVboId))
                {
                        glBindBuffer(GL_ARRAY_BUFFER, m_TexelVboId);
                }
                else if ((type == GLC_MeshData::GLC_Color) && (0 != m_ColorVboId))
                {
                        glBindBuffer(GL_ARRAY_BUFFER, m_ColorVboId);
                }

                else result= false;
        }
        else
        {
                // Unbind VBO
                glBindBuffer(GL_ARRAY_BUFFER, 0);
        }
        return result;

}
// Non Member methods
// Non-member stream operator
QDataStream &operator<<(QDataStream &stream, const GLC_MeshData &meshData)
{
        quint32 chunckId= GLC_MeshData::m_ChunkId;
        stream << chunckId;

        stream << meshData.positionVector();
        stream << meshData.normalVector();
        stream << meshData.texelVector();
        stream << meshData.colorVector();

        // List of lod serialisation
        const int lodCount= meshData.m_LodList.size();
        QList<GLC_Lod> lodsList;
        for (int i= 0; i < lodCount; ++i)
        {
                lodsList.append(*(meshData.m_LodList[i]));
        }
        stream << lodsList;

        return stream;
}

QDataStream &operator>>(QDataStream &stream, GLC_MeshData &meshData)
{
        quint32 chunckId;
        stream >> chunckId;
        Q_ASSERT(chunckId == GLC_MeshData::m_ChunkId);

        meshData.clear();

        GLfloatVector position, normal, texel, color;

        stream >> *(meshData.positionVectorHandle());
        stream >> *(meshData.normalVectorHandle());
        stream >> *(meshData.texelVectorHandle());
        stream >> *(meshData.colorVectorHandle());

        // List of lod serialisation
        QList<GLC_Lod> lodsList;
        stream >> lodsList;
        const int lodCount= lodsList.size();
        for (int i= 0; i < lodCount; ++i)
        {
                meshData.m_LodList.append(new GLC_Lod(lodsList.at(i)));
        }

        return stream;
}