Feature & Fix: Feature Docking layout, Fix ImGUI & glfw submodule

.gitmodules

@@ -1,3 +1,7 @@
 [submodule "external/gtest"]
 	path = external/gtest
 	url = https://github.com/google/googletest.git
+[submodule "external/imgui"]
+	path = external/imgui
+	url = https://github.com/ocornut/imgui.git
+	branch = docking

CMakeLists.txt

@@ -24,7 +24,14 @@ file(GLOB_RECURSE SRC_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
 file(GLOB IMGUI_SRC_FILES "${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/*.cpp")
 
 add_executable(emulator ${SRC_FILES}
-			${CMAKE_CURRENT_SOURCE_DIR}/external/glad/src/glad.c ${IMGUI_SRC_FILES})
+			${CMAKE_CURRENT_SOURCE_DIR}/external/glad/src/glad.c
+			${IMGUI_SRC_FILES}
+			"${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/backends/imgui_impl_glfw.cpp"
+			"${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/backends/imgui_impl_glfw.h"
+			"${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/backends/imgui_impl_opengl3.cpp"
+			"${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/backends/imgui_impl_opengl3.h"
+			"${CMAKE_CURRENT_SOURCE_DIR}/external/imgui/backends/imgui_impl_opengl3_loader.h"
+)
 
 target_link_libraries(emulator PRIVATE glfw OpenGL::GL)
 target_include_directories(emulator PRIVATE external/glfw/include

src/GUI.cpp

@@ -1,8 +1,9 @@
 #include "GUI.h"
 
 #include <imgui.h>
-#include <imgui_impl_glfw.h>
-#include <imgui_impl_opengl3.h>
+#include <imgui_internal.h>
+#include <backends/imgui_impl_glfw.h>
+#include <backends/imgui_impl_opengl3.h>
 #include <imgui_memory_editor.h>
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
@@ -48,17 +49,19 @@ void GUI::CreateWindow() {
   ImGui_ImplOpenGL3_Init("#version 460");
 
   ImGuiIO& io = ImGui::GetIO();
-  io.FontGlobalScale = 2.0f;
+  io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+  io.FontGlobalScale = 1.5f;
 }
 
 void GUI::Run() {
-  while (!glfwWindowShouldClose(m_Window))
-  {
+  while (!glfwWindowShouldClose(m_Window)) {
     glfwPollEvents();
     
     ImGui_ImplOpenGL3_NewFrame();
     ImGui_ImplGlfw_NewFrame();
     ImGui::NewFrame();
+    
+    DockingSetup();
 
     ControlGUI();
     DebugInfoGUI();
@@ -85,6 +88,30 @@ void GUI::Terminate() {
   glfwTerminate();
 }
 
+void GUI::DockingSetup() {
+  ImGuiID dockspace_id = ImGui::GetID("Dockspace");
+  ImGuiViewport* viewport = ImGui::GetMainViewport();
+
+  if (ImGui::DockBuilderGetNode(dockspace_id) == nullptr) {
+    ImGui::DockBuilderAddNode(dockspace_id, ImGuiDockNodeFlags_DockSpace);
+    ImGui::DockBuilderSetNodeSize(dockspace_id, viewport->Size);
+    ImGuiID dock_id_left = 0;
+    ImGuiID dock_id_main = dockspace_id;
+    ImGui::DockBuilderSplitNode(dock_id_main, ImGuiDir_Left, 0.40f, &dock_id_left, &dock_id_main);
+    ImGuiID dock_id_right = 0;
+    ImGui::DockBuilderSplitNode(dock_id_main, ImGuiDir_Right, 0.40f, &dock_id_right, &dock_id_main);
+    // ImGuiID dock_id_left_top = 0;
+    // ImGuiID dock_id_left_bottom = 0;
+    // ImGui::DockBuilderSplitNode(dock_id_left, ImGuiDir_Up, 0.50f, &dock_id_left_top, &dock_id_left_bottom);
+    ImGui::DockBuilderDockWindow("Process Memory", dock_id_main);
+    ImGui::DockBuilderDockWindow("Debug Information", dock_id_left);
+    ImGui::DockBuilderDockWindow("Emulator Control", dock_id_right);
+    ImGui::DockBuilderFinish(dockspace_id);
+  }
+
+  ImGui::DockSpaceOverViewport(dockspace_id, viewport, ImGuiDockNodeFlags_PassthruCentralNode);
+}
+
 void GUI::ControlGUI() {
   ImGui::Begin("Emulator Control");
   ImGui::Text("Current State: %s", m_Userspace.IsRunning() ? "Running" : "Stopped");

src/GUI.h

@@ -14,6 +14,8 @@ private:
   void CreateWindow();
   void Terminate();
 
+  void DockingSetup();
+  
   void ControlGUI();
   void DebugInfoGUI();