glc_texture.cpp

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

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 http://glc-lib.sourceforge.net

 GLC-lib 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 3 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 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser 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_texture.h"
#include "../glc_exception.h"
#include "../glc_global.h"

// Quazip library
#include "../quazip/quazip.h"
#include "../quazip/quazipfile.h"

#include <QtDebug>

// The default maximum texture size
QSize GLC_Texture::m_MaxTextureSize(676, 676);

// The Minimum texture size
const QSize GLC_Texture::m_MinTextureSize(10, 10);

QHash<GLuint, int> GLC_Texture::m_TextureIdUsage;

// Constructor Destructor

GLC_Texture::GLC_Texture()
: m_pQGLContext(NULL)
, m_FileName()
, m_GlTextureID(0)
, m_textureImage()
, m_TextureSize()
, m_HasAlphaChannel(false)
{

}

// Constructor with fileName
GLC_Texture::GLC_Texture(const QString &Filename)
: m_pQGLContext(NULL)
, m_FileName(Filename)
, m_GlTextureID(0)
, m_textureImage(loadFromFile(m_FileName))
, m_TextureSize()
, m_HasAlphaChannel(m_textureImage.hasAlphaChannel())
{
        if (m_textureImage.isNull())
        {
                QString ErrorMess("GLC_Texture::GLC_Texture open image : ");
                ErrorMess.append(m_FileName).append(" Failed");
                qDebug() << ErrorMess;
                GLC_Exception e(ErrorMess);
                throw(e);
        }
}
// Constructor with QFile
GLC_Texture::GLC_Texture(const QFile &file)
: m_pQGLContext(NULL)
, m_FileName(file.fileName())
, m_GlTextureID(0)
, m_textureImage()
, m_TextureSize()
, m_HasAlphaChannel(m_textureImage.hasAlphaChannel())
{
        m_textureImage.load(const_cast<QFile*>(&file), QFileInfo(m_FileName).suffix().toLocal8Bit());
        if (m_textureImage.isNull())
        {
                QString ErrorMess("GLC_Texture::GLC_Texture open image : ");
                ErrorMess.append(m_FileName).append(" Failed");
                qDebug() << ErrorMess;
                GLC_Exception e(ErrorMess);
                throw(e);
        }
}

// Constructor with QImage
GLC_Texture::GLC_Texture(const QImage& image, const QString& fileName)
: m_pQGLContext(NULL)
, m_FileName(fileName)
, m_GlTextureID(0)
, m_textureImage(image)
, m_TextureSize()
, m_HasAlphaChannel(m_textureImage.hasAlphaChannel())
{
        Q_ASSERT(!m_textureImage.isNull());
}

GLC_Texture::GLC_Texture(const GLC_Texture &TextureToCopy)
: m_pQGLContext(TextureToCopy.m_pQGLContext)
, m_FileName(TextureToCopy.m_FileName)
, m_GlTextureID(TextureToCopy.m_GlTextureID)
, m_textureImage(TextureToCopy.m_textureImage)
, m_TextureSize(TextureToCopy.m_TextureSize)
, m_HasAlphaChannel(m_textureImage.hasAlphaChannel())
{
        if (m_textureImage.isNull())
        {
                QString ErrorMess("GLC_Texture::GLC_Texture open image : ");
                ErrorMess.append(m_FileName).append(" Failed");
                qDebug() << ErrorMess;
                GLC_Exception e(ErrorMess);
                throw(e);
        }
        addThisOpenGLTextureId();

}

// Overload "=" operator
GLC_Texture& GLC_Texture::operator=(const GLC_Texture& texture)
{
        if (!(*this == texture))
        {
                removeThisOpenGLTextureId();
                m_pQGLContext= texture.m_pQGLContext;
                m_FileName= texture.m_FileName;
                m_GlTextureID= texture.m_GlTextureID;
                addThisOpenGLTextureId();
                m_textureImage= texture.m_textureImage;
                m_TextureSize= texture.m_TextureSize;
                m_HasAlphaChannel= m_textureImage.hasAlphaChannel();
        }

        return *this;
}

GLC_Texture::~GLC_Texture()
{
        //qDebug() << "GLC_Texture::~GLC_Texture Texture ID : " << m_GlTextureID;
        removeThisOpenGLTextureId();
}
// Get Functions

// Return true if texture are the same
bool GLC_Texture::operator==(const GLC_Texture& texture) const
{
        bool result;
        if (this == &texture)
        {
                result= true;
        }
        else
        {
                result= (m_FileName == texture.m_FileName) && (m_textureImage == texture.m_textureImage);
        }
        return result;
}

// Set Functions

// Set the maximum texture size
void GLC_Texture::setMaxTextureSize(const QSize& size)
{
        if ((size.height() > m_MinTextureSize.height()) && (size.width() > m_MinTextureSize.width()))
        {
                m_MaxTextureSize= size;
        }
        else
        {
                qDebug() << "GLC_Texture::setMaxTextureSize m_MaxTextureSize set to m_MinTextureSize";
                m_MaxTextureSize= m_MinTextureSize;
        }
}

// Private OpenGL functions
// Load the texture
void GLC_Texture::glLoadTexture(QGLContext* pContext)
{
        if (m_GlTextureID == 0)
        {
                if (NULL == pContext)
                {
                        m_pQGLContext= const_cast<QGLContext*>(QGLContext::currentContext());
                }
                else
                {
                        m_pQGLContext= pContext;
                }

                // Test image size
                if ((m_textureImage.height() > m_MaxTextureSize.height())
                                || (m_textureImage.width() > m_MaxTextureSize.width()))
                {
                        QImage rescaledImage;
                        if(m_textureImage.height() > m_textureImage.width())
                        {
                                rescaledImage= m_textureImage.scaledToHeight(m_MaxTextureSize.height(), Qt::SmoothTransformation);
                        }
                        else
                        {
                                rescaledImage= m_textureImage.scaledToWidth(m_MaxTextureSize.width(), Qt::SmoothTransformation);
                        }
                        m_textureImage= rescaledImage;
                        m_TextureSize= m_textureImage.size();
                }
                else
                {
                        m_TextureSize= m_textureImage.size();
                }
                m_GlTextureID= m_pQGLContext->bindTexture(m_textureImage);
                addThisOpenGLTextureId();

                //qDebug() << "GLC_Texture::glcBindTexture Texture ID = " << m_GlTextureID;
        }
}

// Bind texture in 2D mode
void GLC_Texture::glcBindTexture(void)
{
        if (m_GlTextureID == 0)
        {
                glLoadTexture();
        }
        glBindTexture(GL_TEXTURE_2D, m_GlTextureID);
}

QImage GLC_Texture::loadFromFile(const QString& fileName)
{
        QImage resultImage;
        if (glc::isArchiveString(fileName))
        {

                // Load the image from a zip archive
                QuaZip* p3dxmlArchive= new QuaZip(glc::archiveFileName(fileName));
                // Trying to load archive
                if(!p3dxmlArchive->open(QuaZip::mdUnzip))
                {
                  delete p3dxmlArchive;
                  return QImage();
                }
                else
                {
                        // Set the file Name Codec
                        p3dxmlArchive->setFileNameCodec("IBM866");
                }
                QString imageFileName= glc::archiveEntryFileName(fileName);

                // Create QuaZip File
                QuaZipFile* p3dxmlFile= new QuaZipFile(p3dxmlArchive);

                // Get the file of the 3dxml
                if (!p3dxmlArchive->setCurrentFile(imageFileName, QuaZip::csInsensitive))
                {
                        delete p3dxmlFile;
                        delete p3dxmlArchive;
                        return QImage();
                }

                // Open the file of the 3dxml
                if(!p3dxmlFile->open(QIODevice::ReadOnly))
            {
                        delete p3dxmlFile;
                        delete p3dxmlArchive;
                        return QImage();
            }
                resultImage.load(p3dxmlFile, QFileInfo(imageFileName).suffix().toLocal8Bit());
                p3dxmlFile->close();
                delete p3dxmlFile;
                delete p3dxmlArchive;
        }
        else
        {
                resultImage.load(fileName);
        }

        return resultImage;
}

void GLC_Texture::removeThisOpenGLTextureId()
{
        if ( 0 != m_GlTextureID)
        {
                Q_ASSERT(m_TextureIdUsage.contains(m_GlTextureID));
                --m_TextureIdUsage[m_GlTextureID];
                if (m_TextureIdUsage.value(m_GlTextureID) == 0)
                {
                        m_pQGLContext->deleteTexture(m_GlTextureID);
                        m_TextureIdUsage.remove(m_GlTextureID);
                        m_GlTextureID= 0;
                }
        }
}

void GLC_Texture::addThisOpenGLTextureId()
{
        if (0 != m_GlTextureID)
        {
                if (m_TextureIdUsage.contains(m_GlTextureID))
                {
                        ++m_TextureIdUsage[m_GlTextureID];
                }
                else
                {
                        m_TextureIdUsage.insert(m_GlTextureID, 1);
                }
        }
}

// Non-member stream operator
QDataStream &operator<<(QDataStream &stream, const GLC_Texture &texture)
{
        stream << texture.fileName();

        return stream;
}
QDataStream &operator>>(QDataStream &stream, GLC_Texture &texture)
{
        QString fileName;
        stream >> fileName;
        texture= GLC_Texture(fileName);

        return stream;
}