set(IMGUI_SOURCES
	imgui.h
	imgui.cpp
	imconfig.h
	imgui_internal.h
	imgui_demo.cpp
	imgui_draw.cpp
	imgui_tables.cpp
	imgui_widgets.cpp
	imstb_rectpack.h
	imstb_textedit.h
	imstb_truetype.h

	# Since we only use GLFW to manage windows, application can't be built without GLFW
	backend/imgui_impl_glfw.h
	backend/imgui_impl_glfw.cpp
)

option(IMGUI_INCLUDE_OPENGL2_BACKEND ON)
if(IMGUI_INCLUDE_OPENGL2_BACKEND)
	message("ImGui: - building with OpenGL2 backend")
	list(APPEND IMGUI_SOURCES
		backend/imgui_impl_opengl2.h
		backend/imgui_impl_opengl2.cpp
	)
endif()

option(IMGUI_INCLUDE_OPENGL3_BACKEND ON)
if(IMGUI_INCLUDE_OPENGL3_BACKEND)
	message("ImGui: - building with OpenGL3 backend")
	list(APPEND IMGUI_SOURCES
		backend/imgui_impl_opengl3.h
		backend/imgui_impl_opengl3.cpp
	)
endif()

option(IMGUI_INCLUDE_VULKAN_BACKEND ON)
if(IMGUI_INCLUDE_VULKAN_BACKEND)
	message("ImGui: - building with Vulkan backend")
	list(APPEND IMGUI_SOURCES
		backend/imgui_impl_vulkan.h
		backend/imgui_impl_vulkan.cpp
	)
endif()

if(WIN32)
	option(IMGUI_INCLUDE_DX11_BACKEND ON)
	if(IMGUI_INCLUDE_DX11_BACKEND)
		message("ImGui: - building with DirectX11 backend")
		list(APPEND IMGUI_SOURCES
		backend/imgui_impl_dx11.h
		backend/imgui_impl_dx11.cpp
		)
	endif()

	option(IMGUI_INCLUDE_DX12_BACKEND ON)
	if(IMGUI_INCLUDE_DX12_BACKEND)
		message("ImGui: - building with DirectX12 backend")
		list(APPEND IMGUI_SOURCES
		backend/imgui_impl_dx12.h
		backend/imgui_impl_dx12.cpp
		)
	endif()
elseif(APPLE)
	option(IMGUI_INCLUDE_METAL_BACKEND ON)
	if(IMGUI_INCLUDE_METAL_BACKEND)
		message("ImGui: - building with Metal backend")
		list(APPEND IMGUI_SOURCES
			backend/imgui_impl_metal.h
			backend/imgui_impl_metal.mm
		)
	endif()
endif()

add_library(imgui ${IMGUI_SOURCES})
target_compile_definitions(imgui
PRIVATE
	IMGUI_IMPL_OPENGL_LOADER_GLAD=1
)
target_include_directories(imgui
PRIVATE
	${CMAKE_SOURCE_DIR}/3rdparty/imgui
)