OGLTextureManager.cpp

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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/>.
 */
 
#include "gui/tools/OGLTextureManager.h"
#include "gui/app/TYPreferenceDialog.h"
#include <cstddef>
#include <memory>
#include <qcolor.h>
#include <qdebug.h>
#include <qimage.h>
#include <qnamespace.h>
#include <qobject.h>
#include <qoffscreensurface.h>
#include <qopenglcontext.h>
#include <qopengltexture.h>
#include <qopenglversionfunctions.h>
#include <qsurface.h>
#include <qsurfaceformat.h>
 
QMap<QOpenGLContext*, OGLTextureManager*> OGLTextureManager::instances;
 
OGLTextureManager* OGLTextureManager::instance(QOpenGLContext* context)
{
    if (!instances.contains(context))
    {
        QObject::connect(context, &QOpenGLContext::destroyed, [=]() { instances.remove(context); });
        instances[context] = new OGLTextureManager(context);
    }
 
    return instances[context];
}
 
OGLTextureManager::OGLTextureManager(QOpenGLContext* sourceContext)
    : _fallbackTexture(QOpenGLTexture::Target2D), _whiteTexture(QOpenGLTexture::Target2D)
{
    initializeTextures();
}
 
void OGLTextureManager::initializeTextures()
{
    QImage fallbackImage(QSize(404, 404), QImage::Format_RGBA8888);
    fallbackImage.fill(QColor(255, 0, 255));
 
    // Pink fallback texture
    _fallbackTexture.setMinificationFilter(QOpenGLTexture::Nearest);
    _fallbackTexture.setMagnificationFilter(QOpenGLTexture::Nearest);
    _fallbackTexture.setWrapMode(QOpenGLTexture::Repeat);
    _fallbackTexture.setData(fallbackImage, QOpenGLTexture::GenerateMipMaps);
 
    QImage whiteImage(QSize(1, 1), QImage::Format_RGBA8888);
    whiteImage.fill(Qt::white);
 
    // White texture
    _whiteTexture.setMinificationFilter(QOpenGLTexture::Nearest);
    _whiteTexture.setMagnificationFilter(QOpenGLTexture::Nearest);
    _whiteTexture.setWrapMode(QOpenGLTexture::Repeat);
    _whiteTexture.setData(whiteImage, QOpenGLTexture::GenerateMipMaps);
}
 
QOpenGLTexture* OGLTextureManager::whiteTexture()
{
    return &_whiteTexture;
}
 
QOpenGLTexture* OGLTextureManager::fallbackTexture()
{
    return &_fallbackTexture;
}
 
QOpenGLTexture* OGLTextureManager::getTexture(const std::shared_ptr<QImage>& image)
{
    if (image->isNull())
    {
        return &_fallbackTexture;
    }
    std::weak_ptr<QImage> key(image);
    auto textureIterator = imageTextures.find(key);
    if (textureIterator == imageTextures.end())
    {
        auto textureIt =
            imageTextures.emplace(key, std::make_unique<QOpenGLTexture>(QOpenGLTexture::Target2D)).first;
 
        QOpenGLTexture* glTexture = textureIt->second.get();
        glTexture->setMinificationFilter(QOpenGLTexture::Nearest);
        glTexture->setMagnificationFilter(QOpenGLTexture::Nearest);
        glTexture->setWrapMode(QOpenGLTexture::Repeat);
        glTexture->setData(*image, QOpenGLTexture::GenerateMipMaps);
        return glTexture;
    }
    return &*textureIterator->second;
}