qt-everywhere-src-5.15.1/qtquick3d/src/render/qssgrendersync_p.h

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#ifndef QSSG_RENDER_SYNC_H
#define QSSG_RENDER_SYNC_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>
#include <QtQuick3DRender/private/qssgrenderbackend_p.h>

QT_BEGIN_NAMESPACE

// forward declaration
class QSSGRenderContext;
class QSSGRenderBackend;

///< Base class
class Q_QUICK3DRENDER_EXPORT QSSGRenderSync
{
public:
    QAtomicInt ref;

private:
    QSSGRef<QSSGRenderBackend> m_backend; ///< pointer to backend
    QSSGRenderBackend::QSSGRenderBackendSyncObject m_handle; ///< opaque backend handle

    explicit QSSGRenderSync(const QSSGRef<QSSGRenderContext> &context);
public:
    ~QSSGRenderSync();

    /**
     * @brief Get sync type
     *
     * @return Return query type
     */
    QSSGRenderSyncType syncType() const { return QSSGRenderSyncType::GpuCommandsComplete; }

    /**
     * @brief Create a sync object and place it in command stream.
     *		  Note every syncobject can only be used once.
     *		  This function creates a new sync object on ever call
     *		  and deletes the previous one
     *
     * @return no return.
     */
    void sync();

    /**
     * @brief Wait for a sync to be signaled
     *		  Note this blocks until the sync is signaled
     *
     * @return no return.
     */
    void wait();

    /**
     * @brief get the backend object handle
     *
     * @return the backend object handle.
     */
    QSSGRenderBackend::QSSGRenderBackendSyncObject handle() const { return m_handle; }

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

QT_END_NAMESPACE

#endif