From e4ed331cea817e55956200c9c116f8d11b54c86b Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Wed, 5 Jun 2024 02:21:00 +0100
Subject: Add imgui init and shutdown to appbase and gamemainwindow

---
 ui/applicationBase.cpp | 22 ++++++++++++++++++++++
 ui/applicationBase.h   |  4 ++++
 ui/gameMainWindow.cpp  | 15 +++++++++++++++
 ui/gameMainWindow.h    |  4 ++++
 ui/imgui_wrap.h        |  6 ++++++
 5 files changed, 51 insertions(+)
 create mode 100644 ui/imgui_wrap.h

(limited to 'ui')

diff --git a/ui/applicationBase.cpp b/ui/applicationBase.cpp
index 2be1f6c..3fa6e2b 100644
--- a/ui/applicationBase.cpp
+++ b/ui/applicationBase.cpp
@@ -1,8 +1,16 @@
 #include "applicationBase.h"
+#include "imgui_wrap.h"
 #include <SDL2/SDL.h>
 #include <stdexcept>
 
 ApplicationBase::ApplicationBase()
+{
+	initSDL();
+	initImGUI();
+}
+
+void
+ApplicationBase::initSDL() const
 {
 	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS) < 0) {
 		throw std::runtime_error(SDL_GetError());
@@ -24,7 +32,21 @@ ApplicationBase::ApplicationBase()
 	setGlAttribute(SDL_GL_SHARE_WITH_CURRENT_CONTEXT, 1);
 }
 
+void
+ApplicationBase::initImGUI() const
+{
+	// Setup Dear ImGui context
+	IMGUI_CHECKVERSION();
+	ImGui::CreateContext();
+	ImGuiIO & io = ImGui::GetIO();
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
+	io.ConfigFlags |= ImGuiConfigFlags_DockingEnable; // Enable docking
+	io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable; // Enable viewports
+}
+
 ApplicationBase::~ApplicationBase()
 {
 	SDL_Quit();
+	ImGui::DestroyContext();
 }
diff --git a/ui/applicationBase.h b/ui/applicationBase.h
index 9d9b66b..082557d 100644
--- a/ui/applicationBase.h
+++ b/ui/applicationBase.h
@@ -9,4 +9,8 @@ public:
 
 	NO_COPY(ApplicationBase);
 	NO_MOVE(ApplicationBase);
+
+private:
+	void initSDL() const;
+	void initImGUI() const;
 };
diff --git a/ui/gameMainWindow.cpp b/ui/gameMainWindow.cpp
index ccbcdba..8e93694 100644
--- a/ui/gameMainWindow.cpp
+++ b/ui/gameMainWindow.cpp
@@ -16,6 +16,12 @@
 #include <glm/glm.hpp>
 #include <memory>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+#include "backends/imgui_impl_opengl3.h"
+#include "backends/imgui_impl_sdl2.h"
+#pragma GCC diagnostic pop
+
 class GameMainToolbar : Mode<decltype(GameMainSelector::target)>, public Toolbar {
 public:
 	explicit GameMainToolbar(GameMainSelector * gms_) :
@@ -30,11 +36,20 @@ public:
 GameMainWindow::GameMainWindow(size_t w, size_t h) :
 	Window {w, h, "I Like Trains", SDL_WINDOW_OPENGL}, SceneRenderer {Window::size, 0}
 {
+	ImGui_ImplSDL2_InitForOpenGL(m_window, glContext.get());
+	ImGui_ImplOpenGL3_Init();
+
 	uiComponents.create<ManualCameraController>(glm::vec2 {310'727'624, 494'018'810});
 	auto gms = uiComponents.create<GameMainSelector>(&camera, ScreenAbsCoord {w, h});
 	uiComponents.create<GameMainToolbar>(gms.get());
 }
 
+GameMainWindow::~GameMainWindow()
+{
+	ImGui_ImplOpenGL3_Shutdown();
+	ImGui_ImplSDL2_Shutdown();
+}
+
 void
 GameMainWindow::tick(TickDuration)
 {
diff --git a/ui/gameMainWindow.h b/ui/gameMainWindow.h
index a4e822e..594843d 100644
--- a/ui/gameMainWindow.h
+++ b/ui/gameMainWindow.h
@@ -8,11 +8,15 @@
 class GameMainWindow : public Window, SceneRenderer, public SceneProvider {
 public:
 	GameMainWindow(size_t w, size_t h);
+	~GameMainWindow() override;
 
 	void tick(TickDuration) override;
 
 	void render() const override;
 
+	NO_MOVE(GameMainWindow);
+	NO_COPY(GameMainWindow);
+
 private:
 	void content(const SceneShader &) const override;
 	void environment(const SceneShader &, const SceneRenderer &) const override;
diff --git a/ui/imgui_wrap.h b/ui/imgui_wrap.h
new file mode 100644
index 0000000..1d619a4
--- /dev/null
+++ b/ui/imgui_wrap.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+#include "imgui.h" // IWYU pragma: export
+#pragma GCC diagnostic pop
-- 
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