swmmlayerqsgrenderer.h File Reference

#include "map/mapextent.h"
#include <QPointer>
#include <QQuickItem>
#include <QVector>
#include <limits>

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Classes
class	SWMMLayerQSGRenderer

Detailed Description

Author

Caleb Buahin caleb.nosp@m..bua.nosp@m.hin@g.nosp@m.mail.nosp@m..com

Date

2026

Phase B.RHI of docs/RENDERING_5M_PLAN.md — Qt Quick Scene Graph renderer for SWMMModelLayer. Hosted in a QQuickWidget overlay on MapCanvas. Replaces the abandoned OpenGL renderer (SWMMLayerGLRenderer) which couldn't fill polygons via Qt's GL paint engine on macOS Apple Silicon.

Rendering architecture (see docs/QSG_PAN_ZOOM_OPTIMIZATIONS.md):

Stage 1–3: fixed anchor + m_contentDirty flag — pan costs one matrix write, geometry only rebuilt on model change or zoom. Stage 4: subcatchment tri cache keyed off geomRevision — O(n²) ear-clip runs once per geometry change, reused on zoom/selection/symbology. Stage 5: view-frustum culling — off-screen features skipped entirely. Stage 6: LOD — sub-pixel node/gage glyphs suppressed.

NOTE: Stage 7 (async build) was reverted. MapCanvas drives rendering via repaint() + grabFramebuffer() synchronously, so async building races with the grab and produces empty frames. All geometry is built synchronously inside updatePaintNode (on the render thread, which is the main thread for QQuickWidget). Stage 1-6 optimisations still eliminate the O(N) cost for pan and reduce rebuild cost significantly.