Introduce ImGui Unity build

main.cpp

@@ -6,6 +6,16 @@
 #include <GLFW/glfw3.h>
 #include "glad.c"
 
+#define IMGUI_IMPL_OPENGL_LOADER_CUSTOM
+
+#include "imgui/imgui.cpp"
+#include "imgui/imgui_demo.cpp"
+#include "imgui/imgui_draw.cpp"
+#include "imgui/imgui_tables.cpp"
+#include "imgui/imgui_widgets.cpp"
+
+#include "imgui/backends/imgui_impl_opengl3.cpp"
+#include "imgui/backends/imgui_impl_glfw.cpp"
 
 // fonts
 #include <ft2build.h>
@@ -362,6 +372,15 @@ int main([[maybe_unused]]int argc, [[maybe_unused]]char **argv)
       }
 
     hex_program = make_gl_program("shaders/hex.vert", "shaders/hex.frag");
+
+    /* IMGui initalization */
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    static ImGuiIO& io = ImGui::GetIO(); (void)io;
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+    ImGui::StyleColorsDark();
+    ImGui_ImplGlfw_InitForOpenGL(window, true);
+    ImGui_ImplOpenGL3_Init("#version 330 core"); // same as shader version
  
     double cursor_x;
     double cursor_y;
@@ -513,9 +532,23 @@ int main([[maybe_unused]]int argc, [[maybe_unused]]char **argv)
               
         glDisable(GL_BLEND);
         glfwPollEvents();
+
+        // Start the Dear ImGui frame
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+        ImGui::Begin("Hi there");
+        ImGui::End();
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+        
         glfwSwapBuffers(window);
     }
 
+    // Cleanup
+    ImGui_ImplOpenGL3_Shutdown();
+    ImGui_ImplGlfw_Shutdown();
+    ImGui::DestroyContext();
     
     return 0;
  exit_main_with_error: