core/StelTexture.hpp

/*
 * Stellarium
 * Copyright (C) 2006 Fabien Chereau
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335, USA.
 */

#ifndef _STELTEXTURE_HPP_
#define _STELTEXTURE_HPP_

#include "StelTextureTypes.hpp"

#include <QObject>
#include <QImage>
#include <QtOpenGL>
//FIXME: After fully migrate to Qt 4.8 this condition need drop
#if QT_VERSION>=0x040800
#include <QGLFunctions>
#endif

class QFile;
class StelTextureMgr;
class QNetworkReply;

#ifndef GL_CLAMP_TO_EDGE
#define GL_CLAMP_TO_EDGE 0x812F
#endif

// This class is just used internally to load the texture data.
class ImageLoader : QObject
{
    Q_OBJECT

private:
    friend class StelTextureMgr;
    friend class StelTexture;

    ImageLoader(const QString& path, int delay);
    void abort();

signals:
    void finished(QImage);
    void error(const QString& errorMsg);

public slots:
    void start();

private slots:
    void onNetworkReply();
    void directLoad();

private:
    QString path;
    QNetworkReply* networkReply;
};

class StelTexture
//FIXME: After fully migrate to Qt 4.8 this condition need drop
#if QT_VERSION>=0x040800
        : public QObject, protected QGLFunctions
#else
        : public QObject
#endif
{
    Q_OBJECT

public:
    struct StelTextureParams
    {
        StelTextureParams(bool qgenerateMipmaps=false, GLint afiltering=GL_LINEAR, GLint awrapMode=GL_CLAMP_TO_EDGE) :
                generateMipmaps(qgenerateMipmaps),
                filtering(afiltering),
                wrapMode(awrapMode) {;}
        bool generateMipmaps;
        GLint filtering;
        GLint wrapMode;
    };

    virtual ~StelTexture();

    
    bool bind();

    bool canBind() const {return id!=0;}

    bool getDimensions(int &width, int &height);

    const QString& getErrorMessage() const {return errorMessage;}

    const QString& getFullPath() const {return fullPath;}

    bool isLoading() const {return isLoadingImage && !canBind();}

    bool glLoad();

signals:
    void loadingProcessFinished(bool error);

private slots:
    void onImageLoaded(QImage image);
    void onLoadingError(const QString& errorMessage) {reportError(errorMessage);}

private:
    friend class StelTextureMgr;
    friend class TextureLoader;

    StelTexture();

    void reportError(const QString& errorMessage);

    StelTextureParams loadParams;

    ImageLoader* loader;

    bool downloaded;
    bool isLoadingImage;

    QString fullPath;

    QImage qImage;

    QString fileExtension;

    bool errorOccured;

    QString errorMessage;

    GLuint id;

    float avgLuminance;

    GLsizei width;  
    GLsizei height; 
};


#endif // _STELTEXTURE_HPP_