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

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#ifndef QSSG_RENDER_GRAPH_OBJECT_PICK_QUERY_H
#define QSSG_RENDER_GRAPH_OBJECT_PICK_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 <QtGui/QVector2D>
#include <QtGui/QMatrix4x4>

#include <QtQuick3DUtils/private/qssgdataref_p.h>

#include <QtQuick3DRender/private/qssgrenderbasetypes_p.h>

#include <QtQuick3DRuntimeRender/private/qssgrendergraphobject_p.h>

#include <limits>

QT_BEGIN_NAMESPACE

struct QSSGRenderPickResult
{
    const QSSGRenderGraphObject *m_hitObject = nullptr;
    float m_cameraDistanceSq = std::numeric_limits<float>::max();
    // The local coordinates in X,Y UV space where the hit occured
    QVector2D m_localUVCoords;
    // The position in world coordinates
    QVector3D m_scenePosition;

    QSSGRenderPickResult(const QSSGRenderGraphObject &inHitObject,
                         float inCameraDistance,
                         const QVector2D &inLocalUVCoords,
                         const QVector3D &inScenePosition);
    QSSGRenderPickResult() = default;
};

Q_STATIC_ASSERT(std::is_trivially_destructible<QSSGRenderPickResult>::value);

class QSSGGraphObjectPickQueryInterface
{
protected:
    virtual ~QSSGGraphObjectPickQueryInterface() {}

public:
    // Implementors have the option of batching the results to allow fewer virtual calls
    // or returning one item each pick.
    // Results are guaranteed to be returned nearest to furthest
    // If the return value has size of zero then we assume nothing more can be picked and the
    // pick
    // is finished.
    virtual QSSGRenderPickResult pick(const QVector2D &inMouseCoords,
                                      const QVector2D &inViewportDimensions,
                                      bool inPickEverything) = 0;
};
QT_END_NAMESPACE
#endif