split cmakelists

cmake/ImGui.cmake

@@ -0,0 +1,32 @@
+set(IMGUI_SOURCE_DIR ${CMAKE_SOURCE_DIR}/lib/imgui)
+
+add_library(imgui STATIC
+    ${IMGUI_SOURCE_DIR}/imgui.cpp
+    ${IMGUI_SOURCE_DIR}/imgui_draw.cpp
+    ${IMGUI_SOURCE_DIR}/imgui_widgets.cpp
+    ${IMGUI_SOURCE_DIR}/imgui_tables.cpp
+    ${IMGUI_SOURCE_DIR}/backends/imgui_impl_glfw.cpp
+    ${IMGUI_SOURCE_DIR}/backends/imgui_impl_opengl3.cpp
+    ${IMGUI_SOURCE_DIR}/misc/freetype/imgui_freetype.cpp
+)
+
+target_include_directories(imgui PUBLIC SYSTEM
+    ${IMGUI_SOURCE_DIR}
+    ${IMGUI_SOURCE_DIR}/backends
+)
+
+target_compile_definitions(imgui PUBLIC IMGUI_ENABLE_FREETYPE)
+
+if(WIN32)
+    target_include_directories(imgui PUBLIC ${GLFW_INCLUDE_DIRS} ${freetype_SOURCE_DIR}/include)
+    target_link_libraries(imgui PUBLIC freetype)
+else()
+    target_include_directories(imgui PUBLIC ${GLFW_INCLUDE_DIRS} ${FREETYPE_INCLUDE_DIRS})
+    target_link_libraries(imgui PRIVATE 
+        Freetype::Freetype 
+        ${FREETYPE_EXTRA_LIBS}
+        ZLIB::ZLIB 
+        BZip2::BZip2 
+        PNG::PNG
+    )
+endif()