Get ImGui docking working

imgui.ini

@@ -0,0 +1,26 @@
+[Window][Debug##Default]
+Pos=60,60
+Size=400,400
+Collapsed=0
+
+[Window][Terrain Controls]
+Pos=178,120
+Size=568,264
+Collapsed=0
+
+[Window][DockSpaceViewport_11111111]
+Size=1280,720
+Collapsed=0
+
+[Window][DockSpace Demo]
+Size=1280,720
+Collapsed=0
+
+[Window][TerraVisor]
+Pos=0,0
+Size=1280,720
+Collapsed=0
+
+[Docking][Data]
+DockSpace ID=0x6F42A598 Window=0xE80F322C Pos=0,19 Size=1280,701 CentralNode=1
+

source/main.cpp

@@ -1,19 +1,25 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <iostream>
+#include <chrono>
+#include <thread>
 
+#include <imgui.h>
 #include <imgui_impl_glfw.h>
 #include <imgui_impl_opengl3.h>
 
 #include "scene.h"
 
+const int TARGET_FPS = 60;
+const auto FRAME_DURATION = std::chrono::milliseconds(1000 / TARGET_FPS);
+
 int main(){
   if (!glfwInit()) {
     std::cerr << "Failed to initialize GLFW" << std::endl;
     return -1;
   }
 
-  GLFWwindow* window = glfwCreateWindow(800, 600, "TerraVisor", nullptr, nullptr);
+  GLFWwindow* window = glfwCreateWindow(1280, 720, "TerraVisor", nullptr, nullptr);
   if(!window) {
     std::cerr << "Failed to create GLFW window" << std::endl;
     glfwTerminate();
@@ -34,12 +40,28 @@ int main(){
   ImGui::CreateContext();
   ImGui_ImplGlfw_InitForOpenGL(window, true);
   ImGui_ImplOpenGL3_Init("#version 150");
+
+  auto lastFrameTime = std::chrono::high_resolution_clock::now();
   
   while (!glfwWindowShouldClose(window)) {
+    auto frameStart = std::chrono::high_resolution_clock::now();
+
     Scene::Idle();
     Scene::Display(window);
     
     glfwPollEvents();
+
+    auto frameEnd = std::chrono::high_resolution_clock::now();
+    auto frameDuration = frameEnd - frameStart;
+
+    if (frameDuration < FRAME_DURATION) {
+      std::this_thread::sleep_for(FRAME_DURATION - frameDuration);
+    }
+
+    auto currentFrameTime = std::chrono::high_resolution_clock::now();
+    auto actualFrameDuration = std::chrono::duration_cast<std::chrono::milliseconds>(currentFrameTime - lastFrameTime).count();
+
+    lastFrameTime = currentFrameTime;
   }
 
   // Cleanup ImGui

source/scene.cpp

@@ -1,6 +1,10 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
+#include <imgui.h>
+#include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
+
 #include <iostream>
 #include <fstream>
 #include <sstream>
@@ -9,10 +13,76 @@
 #include "Scene.h"
 
 void Scene::DrawGUI(GLFWwindow* window) {
+    // Begin ImGui frame
+    ImGui_ImplOpenGL3_NewFrame();
+    ImGui_ImplGlfw_NewFrame();
+
+    // Enable docking
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+    ImGui::NewFrame();
+
+    static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;
+
+    // Add menu bar
+    ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
+
+    // Style windows
+    const ImGuiViewport* viewport = ImGui::GetMainViewport();
+    ImGui::SetNextWindowPos(viewport->WorkPos);
+    ImGui::SetNextWindowSize(viewport->WorkSize);
+    ImGui::SetNextWindowViewport(viewport->ID);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
+    window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
+    window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
+    window_flags |= ImGuiWindowFlags_NoBackground;
+
+    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
+    ImGui::Begin("TerraVisor", nullptr, window_flags);
+    ImGui::PopStyleVar(3);
+
+    // Submit the DockSpace
+    if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable)
+    {
+        ImGuiID dockspace_id = ImGui::GetID("MyDockSpace");
+        ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
+    }
+
+    if (ImGui::BeginMenuBar())
+    {
+        if (ImGui::BeginMenu("Options"))
+        {
+            ImGui::Text("Nothing Here Yet, Check Back Later!");
+
+            ImGui::EndMenu();
+        }
+
+        ImGui::EndMenuBar();
+    }
+
+    ImGui::End();
+
+    //Draw Gui
+    ImGui::Begin("Terrain Controls");
+    if (ImGui::Button("Quit"))
+    {
+        glfwSetWindowShouldClose(window, GLFW_TRUE);
+    }
+
+    ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
+    ImGui::End();
+
+    ImGui::Render();
+    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
 }
 
 void Scene::Display(GLFWwindow* window) {
     glClear(GL_COLOR_BUFFER_BIT);
+
+    Scene::DrawGUI(window);
+
     glfwSwapBuffers(window);
 }