Mouse picking boilerplate

scwx-qt/source/scwx/qt/gl/draw/draw_item.cpp

@@ -53,6 +53,13 @@ void DrawItem::Render(const QMapLibreGL::CustomLayerRenderParameters& params,
    Render(params);
 }
 
+bool DrawItem::RunMousePicking(
+   const QMapLibreGL::CustomLayerRenderParameters& /* params */)
+{
+   // By default, the draw item is not picked
+   return false;
+}
+
 void DrawItem::UseDefaultProjection(
    const QMapLibreGL::CustomLayerRenderParameters& params,
    GLint                                           uMVPMatrixLocation)

scwx-qt/source/scwx/qt/gl/draw/draw_item.hpp

@@ -33,6 +33,16 @@ public:
                        bool textureAtlasChanged);
    virtual void Deinitialize() = 0;
 
+   /**
+    * @brief Run mouse picking on the draw item.
+    *
+    * @param [in] params Custom layer render parameters
+    *
+    * @return true if the draw item was picked, otherwise false
+    */
+   virtual bool
+   RunMousePicking(const QMapLibreGL::CustomLayerRenderParameters& params);
+
 protected:
    void
    UseDefaultProjection(const QMapLibreGL::CustomLayerRenderParameters& params,

scwx-qt/source/scwx/qt/map/draw_layer.cpp

@@ -76,6 +76,26 @@ void DrawLayer::Deinitialize()
    }
 }
 
+bool DrawLayer::RunMousePicking(
+   const QMapLibreGL::CustomLayerRenderParameters& params)
+{
+   bool itemPicked = false;
+
+   // For each draw item in the draw list in reverse
+   for (auto it = p->drawList_.rbegin(); it != p->drawList_.rend(); ++it)
+   {
+      // Run mouse picking on each draw item
+      if ((*it)->RunMousePicking(params))
+      {
+         // If a draw item was picked, don't process additional items
+         itemPicked = true;
+         break;
+      }
+   }
+
+   return itemPicked;
+}
+
 void DrawLayer::AddDrawItem(const std::shared_ptr<gl::draw::DrawItem>& drawItem)
 {
    p->drawList_.push_back(drawItem);

scwx-qt/source/scwx/qt/map/draw_layer.hpp

@@ -18,9 +18,13 @@ public:
    explicit DrawLayer(const std::shared_ptr<MapContext>& context);
    virtual ~DrawLayer();
 
-   virtual void Initialize();
+   virtual void Initialize() override;
-   virtual void Render(const QMapLibreGL::CustomLayerRenderParameters&);
+   virtual void
-   virtual void Deinitialize();
+   Render(const QMapLibreGL::CustomLayerRenderParameters&) override;
+   virtual void Deinitialize() override;
+
+   virtual bool RunMousePicking(
+      const QMapLibreGL::CustomLayerRenderParameters& params) override;
 
 protected:
    void AddDrawItem(const std::shared_ptr<gl::draw::DrawItem>& drawItem);

scwx-qt/source/scwx/qt/map/generic_layer.cpp

@@ -26,6 +26,13 @@ GenericLayer::GenericLayer(std::shared_ptr<MapContext> context) :
 }
 GenericLayer::~GenericLayer() = default;
 
+bool GenericLayer::RunMousePicking(
+   const QMapLibreGL::CustomLayerRenderParameters& /* params */)
+{
+   // By default, the layer has nothing to pick
+   return false;
+}
+
 std::shared_ptr<MapContext> GenericLayer::context() const
 {
    return p->context_;

scwx-qt/source/scwx/qt/map/generic_layer.hpp

@@ -28,6 +28,16 @@ public:
    virtual void Render(const QMapLibreGL::CustomLayerRenderParameters&) = 0;
    virtual void Deinitialize()                                          = 0;
 
+   /**
+    * @brief Run mouse picking on the layer.
+    *
+    * @param [in] params Custom layer render parameters
+    *
+    * @return true if a draw item was picked, otherwise false
+    */
+   virtual bool
+   RunMousePicking(const QMapLibreGL::CustomLayerRenderParameters& params);
+
 protected:
    std::shared_ptr<MapContext> context() const;
 

scwx-qt/source/scwx/qt/map/map_context.cpp

@@ -30,6 +30,7 @@ public:
    common::RadarProductGroup                radarProductGroup_;
    std::string                              radarProduct_;
    int16_t                                  radarProductCode_;
+   QMapLibreGL::CustomLayerRenderParameters renderParameters_ {};
 };
 
 MapContext::MapContext(
@@ -77,6 +78,11 @@ int16_t MapContext::radar_product_code() const
    return p->radarProductCode_;
 }
 
+QMapLibreGL::CustomLayerRenderParameters MapContext::render_parameters() const
+{
+   return p->renderParameters_;
+}
+
 void MapContext::set_map(std::shared_ptr<QMapLibreGL::Map> map)
 {
    p->map_ = map;
@@ -109,6 +115,12 @@ void MapContext::set_radar_product_code(int16_t radarProductCode)
    p->radarProductCode_ = radarProductCode;
 }
 
+void MapContext::set_render_parameters(
+   const QMapLibreGL::CustomLayerRenderParameters& params)
+{
+   p->renderParameters_ = params;
+}
+
 } // namespace map
 } // namespace qt
 } // namespace scwx

scwx-qt/source/scwx/qt/map/map_context.hpp

@@ -33,6 +33,7 @@ public:
    common::RadarProductGroup                radar_product_group() const;
    std::string                              radar_product() const;
    int16_t                                  radar_product_code() const;
+   QMapLibreGL::CustomLayerRenderParameters render_parameters() const;
 
    void set_map(std::shared_ptr<QMapLibreGL::Map> map);
    void set_pixel_ratio(float pixelRatio);
@@ -41,6 +42,8 @@ public:
    void set_radar_product_group(common::RadarProductGroup radarProductGroup);
    void set_radar_product(const std::string& radarProduct);
    void set_radar_product_code(int16_t radarProductCode);
+   void set_render_parameters(
+      const QMapLibreGL::CustomLayerRenderParameters& params);
 
 private:
    class Impl;

scwx-qt/source/scwx/qt/map/map_widget.cpp

@@ -126,6 +126,7 @@ public:
    void RadarProductViewConnect();
    void RadarProductViewDisconnect();
    void RemovePlacefileLayer(const std::string& placefileName);
+   void RunMousePicking();
    void SetRadarSite(const std::string& radarSite);
    void UpdatePlacefileLayers();
    bool UpdateStoredMapParameters();
@@ -1022,6 +1023,9 @@ void MapWidget::paintGL()
                                  size() * pixelRatio());
    p->map_->render();
 
+   // Perform mouse picking
+   p->RunMousePicking();
+
    // Render ImGui Frame
    ImGui::Render();
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
@@ -1030,6 +1034,25 @@ void MapWidget::paintGL()
    Q_EMIT WidgetPainted();
 }
 
+void MapWidgetImpl::RunMousePicking()
+{
+   const QMapLibreGL::CustomLayerRenderParameters params =
+      context_->render_parameters();
+
+   // For each layer in reverse
+   // TODO: All Generic Layers, not just Placefile Layers
+   for (auto it = placefileLayers_.rbegin(); it != placefileLayers_.rend();
+        ++it)
+   {
+      // Run mouse picking for each layer
+      if ((*it)->RunMousePicking(params))
+      {
+         // If a draw item was picked, don't process additional layers
+         break;
+      }
+   }
+}
+
 void MapWidget::mapChanged(QMapLibreGL::Map::MapChange mapChange)
 {
    switch (mapChange)

scwx-qt/source/scwx/qt/map/overlay_layer.cpp

@@ -95,6 +95,8 @@ void OverlayLayer::Render(
    auto&                settings         = context()->settings();
    const float          pixelRatio       = context()->pixel_ratio();
 
+   context()->set_render_parameters(params);
+
    if (p->sweepTimeNeedsUpdate_ && radarProductView != nullptr)
    {
       const scwx::util::time_zone* currentZone;