qt-everywhere-src-5.14.1/qtquick3d/src/render/qssgrendertimerquery_p.h

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#ifndef QSSG_RENDER_TIMER_QUERY_H
#define QSSG_RENDER_TIMER_QUERY_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/qssgrenderquerybase_p.h>

QT_BEGIN_NAMESPACE

// forward declaration
class QSSGRenderContext;

class Q_QUICK3DRENDER_EXPORT QSSGRenderTimerQuery : public QSSGRenderQueryBase
{
    /**
     * @brief constructor
     *
     * @param[in] context		Pointer to context
     * @param[in] fnd			Pointer to foundation
     *
     * @return No return.
     */
    explicit QSSGRenderTimerQuery(const QSSGRef<QSSGRenderContext> &context);

public:
    ~QSSGRenderTimerQuery() override;

    /**
     * @brief Get query type
     *
     * @return Return query type
     */
    QSSGRenderQueryType queryType() const override { return QSSGRenderQueryType::Timer; }

    /**
     * @brief begin a query
     *
     * @return no return.
     */
    void begin() override;

    /**
     * @brief end a query
     *
     * @return no return.
     */
    void end() override;

    /**
     * @brief Get the result of a query
     *
     * @param[out] params	Contains result of query regarding query type
     *
     * @return no return.
     */
    void result(quint32 *params) override;

    /**
     * @brief Get the result of a query
     *
     * @param[out] params	Contains result of query regarding query type
     *
     * @return no return.
     */
    virtual void result(quint64 *params);

    /**
     * @brief Places an absolute timer query into the render queue
     *		  The result can be queried with GetResult
     *
     * @return no return.
     */
    virtual void setTimerQuery();

    /*
     * @brief static creation function
     *
     * * @return a timer query object on success
     */
    static QSSGRef<QSSGRenderTimerQuery> create(const QSSGRef<QSSGRenderContext> &context);
};

QT_END_NAMESPACE

#endif