Demonstrate how to acquire and use ImGui-SFML

CMakeLists.txt

@@ -5,13 +5,26 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
 option(BUILD_SHARED_LIBS "Build shared libraries" OFF)
 
 include(FetchContent)
+
 FetchContent_Declare(SFML
     GIT_REPOSITORY https://github.com/SFML/SFML.git
     GIT_TAG 2.6.x)
 FetchContent_MakeAvailable(SFML)
 
+FetchContent_Declare(ImGui
+    GIT_REPOSITORY https://github.com/ocornut/imgui
+    GIT_TAG v1.89.9)
+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 2.6.x)
+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)
 target_compile_features(main PRIVATE cxx_std_17)
 
 if(WIN32)

src/main.cpp

@@ -1,21 +1,37 @@
 #include <SFML/Graphics.hpp>
+#include <imgui-SFML.h>
+#include <imgui.h>
 
 int main()
 {
     auto window = sf::RenderWindow{ { 1920u, 1080u }, "CMake SFML Project" };
     window.setFramerateLimit(144);
+    if (!ImGui::SFML::Init(window))
+        return -1;
 
+    sf::Clock clock;
     while (window.isOpen())
     {
         for (auto event = sf::Event{}; window.pollEvent(event);)
         {
+            ImGui::SFML::ProcessEvent(window, event);
+
             if (event.type == 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();
 }