Use ImGui Manager to create contexts

scwx-qt/source/scwx/qt/manager/resource_manager.cpp

@@ -4,12 +4,6 @@
 #include <scwx/qt/util/texture_atlas.hpp>
 #include <scwx/util/logger.hpp>
 
-#include <backends/imgui_impl_opengl3.h>
-#include <backends/imgui_impl_qt.hpp>
-#include <imgui.h>
-#include <QOffscreenSurface>
-#include <QOpenGLContext>
-
 namespace scwx
 {
 namespace qt
@@ -18,58 +12,21 @@ namespace manager
 {
 namespace ResourceManager
 {
-static const std::string logPrefix_ = "scwx::qt::manager::ResourceManager";
+static const std::string logPrefix_ = "scwx::qt::manager::resource_manager";
 static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
 
-static void InitializeImGui();
 static void LoadFonts();
 static void LoadTextures();
-static void ShutdownImGui();
-
-static std::unique_ptr<QOffscreenSurface> surface_ {};
-static ImGuiContext*                      imGuiContext_ {};
 
 void Initialize()
 {
    config::CountyDatabase::Initialize();
 
-   InitializeImGui();
    LoadFonts();
    LoadTextures();
 }
 
-void Shutdown()
+void Shutdown() {}
-{
-   ShutdownImGui();
-}
-
-static void InitializeImGui()
-{
-   // Create OpenGL Offscreen Surface
-   surface_ = std::make_unique<QOffscreenSurface>();
-   surface_->create();
-   if (!QOpenGLContext::globalShareContext()->makeCurrent(surface_.get()))
-   {
-      logger_->warn("Failed to initialize offscreen surface");
-   }
-
-   // Initialize ImGui
-   imGuiContext_ = ImGui::CreateContext();
-   ImGui_ImplQt_Init();
-   ImGui_ImplOpenGL3_Init();
-   QOpenGLContext::globalShareContext()->doneCurrent();
-
-   // ImGui Configuration
-   auto& io = ImGui::GetIO();
-
-   // Disable automatic configuration loading/saving
-   io.IniFilename = nullptr;
-
-   // Style
-   auto& style = ImGui::GetStyle();
-
-   style.WindowMinSize = {10.0f, 10.0f};
-}
 
 static void LoadFonts()
 {
@@ -87,16 +44,6 @@ static void LoadTextures()
    textureAtlas.BuildAtlas(8, 8);
 }
 
-static void ShutdownImGui()
-{
-   QOpenGLContext::globalShareContext()->makeCurrent(surface_.get());
-   ImGui::SetCurrentContext(imGuiContext_);
-   ImGui_ImplOpenGL3_Shutdown();
-   ImGui_ImplQt_Shutdown();
-   ImGui::DestroyContext();
-   QOpenGLContext::globalShareContext()->doneCurrent();
-}
-
 } // namespace ResourceManager
 } // namespace manager
 } // namespace qt

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

@@ -1,5 +1,6 @@
 #include <scwx/qt/map/map_widget.hpp>
 #include <scwx/qt/gl/gl.hpp>
+#include <scwx/qt/manager/imgui_manager.hpp>
 #include <scwx/qt/manager/radar_product_manager.hpp>
 #include <scwx/qt/manager/settings_manager.hpp>
 #include <scwx/qt/map/alert_layer.hpp>
@@ -61,7 +62,7 @@ public:
        settings_(settings),
        map_(),
        layerList_ {},
-       imGuiContext_ {ImGui::CreateContext()},
+       imGuiRendererInitialized_ {false},
        radarProductManager_ {nullptr},
        radarProductLayer_ {nullptr},
        alertLayer_ {std::make_shared<AlertLayer>(context_)},
@@ -82,14 +83,11 @@ public:
       SetRadarSite(scwx::qt::manager::SettingsManager::general_settings()
                       ->default_radar_site());
 
-      // Set ImGui Context
+      // Create ImGui Context
-      ImGui::SetCurrentContext(imGuiContext_);
+      static size_t currentMapId_ {0u};
-
+      imGuiContextName_ = std::format("Map {}", ++currentMapId_);
-      // ImGui Configuration
+      imGuiContext_ =
-      auto& io = ImGui::GetIO();
+         manager::ImGuiManager::Instance().CreateContext(imGuiContextName_);
-
-      // Disable automatic configuration loading/saving
-      io.IniFilename = nullptr;
 
       // Initialize ImGui Qt backend
       ImGui_ImplQt_Init();
@@ -102,9 +100,14 @@ public:
       ImGui::SetCurrentContext(imGuiContext_);
 
       // Shutdown ImGui Context
-      ImGui_ImplOpenGL3_Shutdown();
+      if (imGuiRendererInitialized_)
+      {
+         ImGui_ImplOpenGL3_Shutdown();
+      }
       ImGui_ImplQt_Shutdown();
-      ImGui::DestroyContext(imGuiContext_);
+
+      // Destroy ImGui Context
+      manager::ImGuiManager::Instance().DestroyContext(imGuiContextName_);
    }
 
    void AddLayer(const std::string&            id,
@@ -129,6 +132,8 @@ public:
    std::list<std::string>            layerList_;
 
    ImGuiContext* imGuiContext_;
+   std::string   imGuiContextName_;
+   bool          imGuiRendererInitialized_;
 
    std::shared_ptr<manager::RadarProductManager> radarProductManager_;
 
@@ -676,6 +681,7 @@ void MapWidget::initializeGL()
    // Initialize ImGui OpenGL3 backend
    ImGui::SetCurrentContext(p->imGuiContext_);
    ImGui_ImplOpenGL3_Init();
+   p->imGuiRendererInitialized_ = true;
 
    p->map_.reset(
       new QMapLibreGL::Map(nullptr, p->settings_, size(), pixelRatio()));

scwx-qt/source/scwx/qt/ui/imgui_debug_widget.cpp

@@ -1,4 +1,5 @@
 #include <scwx/qt/ui/imgui_debug_widget.hpp>
+#include <scwx/qt/manager/imgui_manager.hpp>
 
 #include <imgui.h>
 #include <backends/imgui_impl_opengl3.h>
@@ -16,17 +17,12 @@ static const std::string logPrefix_ = "scwx::qt::ui::imgui_debug_widget";
 class ImGuiDebugWidgetImpl
 {
 public:
-   explicit ImGuiDebugWidgetImpl(ImGuiDebugWidget* self) :
+   explicit ImGuiDebugWidgetImpl(ImGuiDebugWidget* self) : self_ {self}
-       self_ {self}, context_ {ImGui::CreateContext()}
    {
-      // Set ImGui Context
+      // Create ImGui Context
-      ImGui::SetCurrentContext(context_);
+      static size_t currentIndex_ {0u};
-
+      contextName_ = std::format("ImGui Debug {}", ++currentIndex_);
-      // ImGui Configuration
+      context_ = manager::ImGuiManager::Instance().CreateContext(contextName_);
-      auto& io = ImGui::GetIO();
-
-      // Disable automatic configuration loading/saving
-      io.IniFilename = nullptr;
 
       // Initialize ImGui Qt backend
       ImGui_ImplQt_Init();
@@ -39,15 +35,22 @@ public:
       ImGui::SetCurrentContext(context_);
 
       // Shutdown ImGui Context
-      ImGui_ImplOpenGL3_Shutdown();
+      if (imGuiRendererInitialized_)
+      {
+         ImGui_ImplOpenGL3_Shutdown();
+      }
       ImGui_ImplQt_Shutdown();
-      ImGui::DestroyContext(context_);
+
+      // Destroy ImGui Context
+      manager::ImGuiManager::Instance().DestroyContext(contextName_);
    }
 
    ImGuiDebugWidget* self_;
    ImGuiContext*     context_;
+   std::string       contextName_;
 
    bool firstRender_ {true};
+   bool imGuiRendererInitialized_ {false};
 };
 
 ImGuiDebugWidget::ImGuiDebugWidget(QWidget* parent) :
@@ -57,6 +60,8 @@ ImGuiDebugWidget::ImGuiDebugWidget(QWidget* parent) :
    setFocusPolicy(Qt::StrongFocus);
 }
 
+ImGuiDebugWidget::~ImGuiDebugWidget() {}
+
 void ImGuiDebugWidget::initializeGL()
 {
    makeCurrent();
@@ -64,6 +69,7 @@ void ImGuiDebugWidget::initializeGL()
    // Initialize ImGui OpenGL3 backend
    ImGui::SetCurrentContext(p->context_);
    ImGui_ImplOpenGL3_Init();
+   p->imGuiRendererInitialized_ = true;
 }
 
 void ImGuiDebugWidget::paintGL()
@@ -93,8 +99,6 @@ void ImGuiDebugWidget::paintGL()
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 }
 
-ImGuiDebugWidget::~ImGuiDebugWidget() {}
-
 } // namespace ui
 } // namespace qt
 } // namespace scwx