qt-everywhere-src-5.14.1/qtdeclarative/src/quick/scenegraph/adaptations/software/qsgsoftwareadaptation.cpp

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#include "qsgsoftwareadaptation_p.h"
#include "qsgsoftwarecontext_p.h"
#include "qsgsoftwarerenderloop_p.h"
#include "qsgsoftwarethreadedrenderloop_p.h"

#include <private/qguiapplication_p.h>
#include <qpa/qplatformintegration.h>

QT_BEGIN_NAMESPACE

QSGSoftwareAdaptation::QSGSoftwareAdaptation(QObject *parent)
    : QSGContextPlugin(parent)
{
}

QStringList QSGSoftwareAdaptation::keys() const
{
    return QStringList() << QLatin1String("software") << QLatin1String("softwarecontext");
}

QSGContext *QSGSoftwareAdaptation::create(const QString &) const
{
    if (!instance)
        instance = new QSGSoftwareContext();
    return instance;
}

QSGContextFactoryInterface::Flags QSGSoftwareAdaptation::flags(const QString &) const
{
    // Claim we support adaptable shader effects, then return null for the
    // shader effect node. The result is shader effects not being rendered,
    // with the application working fine in all other respects.
    return QSGContextFactoryInterface::SupportsShaderEffectNode;
}

QSGRenderLoop *QSGSoftwareAdaptation::createWindowManager()
{
#if QT_CONFIG(thread)
    static bool threaded = false;
    static bool envChecked = false;
    if (!envChecked) {
        envChecked = true;
        threaded = qgetenv("QSG_RENDER_LOOP") == "threaded";
    }

    if (threaded)
        return new QSGSoftwareThreadedRenderLoop;
#endif

    return new QSGSoftwareRenderLoop();
}

QSGSoftwareContext *QSGSoftwareAdaptation::instance = nullptr;

QT_END_NAMESPACE