refactor example + adding imgui and imtui submodules

examples/third-party/imgui/CMakeLists.txt

@@ -0,0 +1,67 @@
+if (GGWAVE_ALL_WARNINGS_3RD_PARTY)
+    if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic")
+    else()
+        # todo : windows
+    endif()
+endif()
+
+if (APPLE)
+    set(ADDITIONAL_LIBRARIES "-framework Cocoa")
+else (APPLE)
+    unset(ADDITIONAL_LIBRARIES)
+endif (APPLE)
+
+add_library(imgui SHARED
+    imgui/imgui.cpp
+    imgui/imgui_draw.cpp
+    imgui/imgui_demo.cpp
+    imgui/imgui_widgets.cpp
+    )
+
+target_include_directories(imgui INTERFACE
+    .
+    )
+
+target_include_directories(imgui PRIVATE
+    imgui
+    )
+
+target_link_libraries(imgui PRIVATE
+    ${ADDITIONAL_LIBRARIES}
+    )
+
+if (GGWAVE_SUPPORT_SDL2)
+    find_package(OpenGL REQUIRED)
+    find_package(SDL2 REQUIRED)
+    string(STRIP "${SDL2_LIBRARIES}" SDL2_LIBRARIES)
+
+    add_library(imgui-sdl2 SHARED
+        imgui/examples/libs/gl3w/GL/gl3w.c
+        imgui-extra/imgui_impl.cpp
+        imgui-extra/imgui_impl_sdl.cpp
+        imgui-extra/imgui_impl_opengl3.cpp
+        )
+
+    target_include_directories(imgui-sdl2 PUBLIC
+        imgui/examples/libs/gl3w
+        ${SDL2_INCLUDE_DIRS}
+        )
+
+    target_include_directories(imgui-sdl2 PRIVATE
+        imgui
+        imgui-extra
+        )
+
+    target_link_libraries(imgui-sdl2 PUBLIC
+        imgui
+        ${OPENGL_LIBRARIES}
+        ${SDL2_LIBRARIES}
+        )
+
+    target_link_libraries(imgui-sdl2 PRIVATE
+        ${CMAKE_DL_LIBS}
+        ${CMAKE_THREAD_LIBS_INIT}
+        ${ADDITIONAL_LIBRARIES}
+        )
+endif()