swmmlayerqsgrenderer.h

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#ifndef SWMMLAYERQSGRENDERER_H
#define SWMMLAYERQSGRENDERER_H
 
#include "map/mapextent.h"
 
#include <QPointer>
#include <QQuickItem>
#include <QVector>
 
#include <limits>
 
class SWMMModelLayer;
 
class SWMMLayerQSGRenderer : public QQuickItem
{
    Q_OBJECT
 
public:
    explicit SWMMLayerQSGRenderer(QQuickItem *parent = nullptr);
    ~SWMMLayerQSGRenderer() override;
 
    void setLayer(SWMMModelLayer *layer);
 
    void setMapExtent(const MapExtent &extent);
 
    void forceRebuild();
 
    [[nodiscard]] quint64 contentRevision() const noexcept
    { return m_contentRev; }
 
protected:
    QSGNode *updatePaintNode(QSGNode *oldNode,
                             UpdatePaintNodeData *) override;
 
private:
    void noteContentChanged() { ++m_contentRev; update(); }
 
    QPointer<SWMMModelLayer> m_layer;
    quint64                  m_contentRev = 0;
    MapExtent                m_extent;
    // Extent at the last full content rebuild. Used by setMapExtent()
    // to decide pan-only (transform refresh) vs. full rebuild based on
    // how far the viewport has drifted from the cached cull window.
    MapExtent                m_lastBuiltExtent;
 
    // Fixed scene-space centre of the dataset bounding box, recomputed at
    // the start of each content rebuild.  Vertex coords stored as
    // float(sceneCoord - anchor) keep float magnitudes small (UTM precision)
    // and are stable across pans — only the matrix translate changes on pan.
    double m_anchorX = 0.0;
    double m_anchorY = 0.0;
 
    // m_contentDirty — set on geometry / symbology / visibility / zoom changes.
    // Triggers a full rebuild of all 13 geometry buffers in updatePaintNode.
    // Pure pan does NOT set this flag.
    bool m_contentDirty = true;
 
    // m_selDirty — set when only the selection changes (setSelectedElementNames).
    // Triggers a cheap rebuild of the 5 selection-overlay buffers only; the 8
    // base-geometry buffers are left untouched.
    // m_selectionPending absorbs the repaintRequested that always follows
    // selectionChanged so it does not additionally set m_contentDirty.
    bool m_selDirty        = false;
    bool m_selectionPending = false;
 
    // Subcatchment triangulation cache (Stage 4).
    // Ear-clipping O(n²) result cached per geomRevision; reused on every
    // rebuild that does not change subcatchment geometry.
    struct CatchTriCache {
        quint64               revision = std::numeric_limits<quint64>::max();
        QVector<QVector<int>> tris;
    };
    CatchTriCache m_catchTriCache;
};
 
#endif // SWMMLAYERQSGRENDERER_H