Adjusted project organization

src/main.cpp

@@ -1,41 +1,52 @@
 #include "imgui.h"
 #include "imgui-SFML.h"
 
+#include <SFML/Window.hpp>
 #include <SFML/Graphics.hpp>
 
-int main() {
-    sf::RenderWindow window;
+static sf::RenderWindow window{};
+static sf::Clock deltaClock{};
+
+void initialize_window() {
     window.create(sf::VideoMode({ 1280, 720 }), "My window");
     window.setFramerateLimit(60);
     window.setVerticalSyncEnabled(true);
+}
 
+void initialize_imgui() {
     if (!ImGui::SFML::Init(window))
-        return -1;
+        exit(-1);
+}
 
-    sf::Clock deltaClock;
-    while (window.isOpen())
+void poll_events() {
+    while (const std::optional event = window.pollEvent())
     {
+        ImGui::SFML::ProcessEvent(window, *event);
+        // "close requested" event: we close the window
+        if (event->is<sf::Event::Closed>())
+            window.close();
+    }
+}
+
+extern void setup();
+extern void loop();
+extern void draw_gui();
+
+int main() {
+    initialize_window();
+    initialize_imgui();
+    setup();
+    while (window.isOpen()) {
         // Event Polling
-        while (const std::optional event = window.pollEvent())
-        {
-            ImGui::SFML::ProcessEvent(window, *event);
-
-            // "close requested" event: we close the window
-            if (event->is<sf::Event::Closed>())
-                window.close();
-        }
-
+        poll_events();
         // Update
+        loop();
         ImGui::SFML::Update(window, deltaClock.restart());
-        // ImGui::ShowDemoWindow();
-
+        draw_gui();
         // Render
         window.clear();
-
         ImGui::SFML::Render(window);
-
         window.display();
     }
-
-	return 0;
+    return 0;
 }

src/project.cpp

@@ -0,0 +1,13 @@
+#include <imgui.h>
+#include <imgui-SFML.h>
+
+void setup() {
+}
+
+void loop() {
+}
+
+void draw_gui() {
+    // draw your GUI
+    ImGui::ShowDemoWindow();
+}