add_subdirectory(build/hidapi)
add_subdirectory(build/tinkerforge)

if(ENABLE_WS281XPWM)
	add_library(ws281x
		external/rpi_ws281x/mailbox.c external/rpi_ws281x/ws2811.c
		external/rpi_ws281x/pwm.c external/rpi_ws281x/dma.c
		external/rpi_ws281x/pcm.c
		external/rpi_ws281x/rpihw.c)
endif()

set(USE_SYSTEM_FLATBUFFERS_LIBS ${DEFAULT_USE_SYSTEM_FLATBUFFERS_LIBS} CACHE BOOL "use flatbuffers library from system")

if (USE_SYSTEM_FLATBUFFERS_LIBS)
	find_package(flatbuffers REQUIRED)
	include_directories(${FLATBUFFERS_INCLUDE_DIRS})
else ()
	set(BUILD_SHARED_LIBS OFF CACHE BOOL "Build shared flatbuffers library")
	set(FLATBUFFERS_BUILD_TESTS OFF CACHE BOOL "Build Flatbuffers with tests")
	add_subdirectory(external/flatbuffers)

	if(CMAKE_CROSSCOMPILING)
		# when crosscompiling import the flatc executable targets from a file generated by a native build
		option(IMPORT_FLATC "flatc export file (flatc_export.cmake) from a native build" "IMPORT_FLATC-FILE_NOT_FOUND")
		include(${IMPORT_FLATC})
	else()
		# export the flatc compiler so it can be used when cross compiling
		export(TARGETS flatc FILE "${CMAKE_BINARY_DIR}/flatc_export.cmake")
	endif()

	# define the include for the flatbuffers library at the parent scope
	set(FLATBUFFERS_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/external/flatbuffers/include")
	set(FLATBUFFERS_INCLUDE_DIRS ${FLATBUFFERS_INCLUDE_DIRS} PARENT_SCOPE)

	# define the flatc executable at the parent scope
	get_property(FLATBUFFERS_FLATC_EXECUTABLE TARGET flatc PROPERTY LOCATION)
	set(FLATBUFFERS_FLATC_EXECUTABLE ${FLATBUFFERS_FLATC_EXECUTABLE} PARENT_SCOPE)
endif()

message(STATUS "Using flatbuffers compiler: " ${FLATBUFFERS_FLATC_EXECUTABLE})


function(compile_flattbuffer_schema SRC_FBS OUTPUT_DIR)
  string(REGEX REPLACE "\\.fbs$" "_generated.h" GEN_HEADER ${SRC_FBS})
  add_custom_command(
    OUTPUT ${GEN_HEADER}
    COMMAND "${FLATBUFFERS_FLATC_EXECUTABLE}" -c --no-includes --gen-mutable
			--gen-object-api
			-o "${OUTPUT_DIR}"
			"${SRC_FBS}"
    DEPENDS flatc)
endfunction()