qt-everywhere-src-5.15.1/qtquick3d/src/runtimerender/qssgrendergpuprofiler_p.h

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#ifndef QSSG_RENDER_PROFILER_H
#define QSSG_RENDER_PROFILER_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtQuick3DRender/private/qssgrenderbasetypes_p.h>

QT_BEGIN_NAMESPACE

/**
 *	Opaque profiling system for rendering.
 */

class QSSGRenderContextInterface;
class QSSGRenderContext;
struct QSSGGpuTimerInfo;

class QSSGRenderGPUProfiler
{
private:
    QSSGRef<QSSGRenderContext> m_renderContext;
    QSSGRef<QSSGRenderContextInterface> m_context;

    typedef QHash<QString, QSSGRef<QSSGGpuTimerInfo>> TStrGpuTimerInfoMap;

    TStrGpuTimerInfoMap m_strToGpuTimerMap;
    QVector<QString> m_timerIds;
    mutable quint32 m_vertexCount;

    QSSGRef<QSSGGpuTimerInfo> getOrCreateGpuTimerInfo(QString &nameID);
    QSSGRef<QSSGGpuTimerInfo> getGpuTimerInfo(const QString &nameID) const;

public:

    QSSGRenderGPUProfiler(const QSSGRef<QSSGRenderContextInterface> &inContext, const QSSGRef<QSSGRenderContext> &inRenderContext);
    ~QSSGRenderGPUProfiler();

    /**
     * @brief start a timer query
     *
     * @param[in] nameID			Timer ID for tracking
     * @param[in] absoluteTime		If true the absolute GPU is queried
     * @param[in] sync				Do a sync before starting the timer
     *
     * @return no return
     */
    void startTimer(QString &nameID, bool absoluteTime, bool sync);

    /**
     * @brief stop a timer query
     *
     * @param[in] nameID			Timer ID for tracking
     *
     * @return no return
     */
    void endTimer(QString &nameID);

    /**
     * @brief Get elapsed timer value. Not this is an averaged time over several frames
     *
     * @param[in] nameID			Timer ID for tracking
     *
     * @return no return
     */
    double elapsed(const QString &nameID) const;

    /**
     * @brief Get ID list of tracked timers
     *
     * @return ID list
     */
    const QVector<QString> &timerIDs() const;

    /**
     * @brief add vertex count to current counter
     *
     * @return
     */
    void addVertexCount(quint32 count);

    /**
     * @brief get current vertex count and reset
     *
     * @return
     */
    quint32 getAndResetVertexCount() const;
};
QT_END_NAMESPACE

#endif