Demonstrate how to acquire and use ImGui-SFML

CMakeLists.txt

@@ -4,6 +4,7 @@ project(CMakeSFMLProject LANGUAGES CXX)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 
 include(FetchContent)
+
 FetchContent_Declare(SFML
     GIT_REPOSITORY https://github.com/SFML/SFML.git
     GIT_TAG 3.0.0
@@ -12,5 +13,23 @@ FetchContent_Declare(SFML
     SYSTEM)
 FetchContent_MakeAvailable(SFML)
 
+FetchContent_Declare(ImGui
+    GIT_REPOSITORY https://github.com/ocornut/imgui
+    GIT_TAG v1.91.1
+    GIT_SHALLOW ON
+    EXCLUDE_FROM_ALL
+    SYSTEM)
+FetchContent_MakeAvailable(ImGui)
+FetchContent_GetProperties(ImGui SOURCE_DIR IMGUI_DIR)
+
+set(IMGUI_SFML_FIND_SFML OFF)
+FetchContent_Declare(ImGui-SFML
+    GIT_REPOSITORY https://github.com/SFML/imgui-sfml
+    GIT_TAG v3.0
+    GIT_SHALLOW ON
+    EXCLUDE_FROM_ALL
+    SYSTEM)
+FetchContent_MakeAvailable(ImGui-SFML)
+
 add_executable(main src/main.cpp)
-target_link_libraries(main PRIVATE SFML::Graphics)
+target_link_libraries(main PRIVATE SFML::Graphics ImGui-SFML::ImGui-SFML)

src/main.cpp

@@ -1,21 +1,37 @@
 #include <SFML/Graphics.hpp>
+#include <imgui-SFML.h>
+#include <imgui.h>
 
 int main()
 {
     auto window = sf::RenderWindow(sf::VideoMode({1920u, 1080u}), "CMake SFML Project");
     window.setFramerateLimit(144);
+    if (!ImGui::SFML::Init(window))
+        return -1;
 
+    sf::Clock clock;
     while (window.isOpen())
     {
         while (const std::optional event = window.pollEvent())
         {
+            ImGui::SFML::ProcessEvent(window, *event);
+
             if (event->is<sf::Event::Closed>())
             {
                 window.close();
             }
         }
 
+        ImGui::SFML::Update(window, clock.restart());
+
+        ImGui::Begin("Hello, world!");
+        ImGui::Button("Look at this pretty button");
+        ImGui::End();
+
         window.clear();
+        ImGui::SFML::Render(window);
         window.display();
     }
+
+    ImGui::SFML::Shutdown();
 }