OGLTextureManager.h

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/*
 * Copyright (C) <2012-2024> <EDF-DTG> <FRANCE>
 * This file is part of Code_TYMPAN (R).
 * Code_TYMPAN (R) 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 3 of the License, or
 * (at your option) any later version.
 * Code_TYMPAN (R) 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 Code_TYMPAN (R). If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef __O_TEXTURE_MANAGER__
#define __O_TEXTURE_MANAGER__
 
#include <memory>
#include <qobject.h>
#include <qoffscreensurface.h>
#include <qopenglcontext.h>
#include <qopengltexture.h>
 
class OGLTextureManager
{
public:
    static OGLTextureManager* instance(QOpenGLContext* context);
    QOpenGLTexture* getTexture(const std::shared_ptr<QImage>& image);
    QOpenGLTexture* whiteTexture();
    QOpenGLTexture* fallbackTexture();
 
private:
    /*
     * Initialize a new texture manager usable by a given context.
     */
    OGLTextureManager(QOpenGLContext* context);
 
    ~OGLTextureManager() = default;
 
    void initializeTextures();
 
    std::map<std::weak_ptr<QImage>, std::unique_ptr<QOpenGLTexture>, std::owner_less<>> imageTextures;
    QOpenGLTexture _fallbackTexture;
    QOpenGLTexture _whiteTexture;
 
    static QMap<QOpenGLContext*, OGLTextureManager*> instances;
};
 
#endif // __O_TEXTURE_MANAGER__