Add imgui debug window, still need to use unique contexts

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

@@ -0,0 +1,56 @@
+#include <scwx/qt/ui/imgui_debug_widget.hpp>
+
+#include <imgui.h>
+#include <backends/imgui_impl_opengl3.h>
+#include <backends/imgui_impl_qt.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace ui
+{
+
+static const std::string logPrefix_ = "scwx::qt::ui::imgui_debug_widget";
+
+class ImGuiDebugWidgetImpl
+{
+public:
+   explicit ImGuiDebugWidgetImpl(ImGuiDebugWidget* self) : self_ {self}
+   {
+      // ImGui Configuration
+      auto& io = ImGui::GetIO();
+
+      // Initialize Qt backend
+      ImGui_ImplQt_RegisterWidget(self_);
+   }
+   ~ImGuiDebugWidgetImpl() {}
+
+   ImGuiDebugWidget* self_;
+};
+
+ImGuiDebugWidget::ImGuiDebugWidget(QWidget* parent) :
+    QOpenGLWidget(parent), p {std::make_unique<ImGuiDebugWidgetImpl>(this)}
+{
+}
+
+void ImGuiDebugWidget::initializeGL() {}
+
+void ImGuiDebugWidget::paintGL()
+{
+   ImGui_ImplQt_NewFrame(this);
+   ImGui_ImplOpenGL3_NewFrame();
+
+   ImGui::NewFrame();
+
+   ImGui::ShowDemoWindow();
+
+   ImGui::Render();
+   ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+}
+
+ImGuiDebugWidget::~ImGuiDebugWidget() {}
+
+} // namespace ui
+} // namespace qt
+} // namespace scwx