SDL

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function(SDL_DetectCMakePlatform)
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  set(sdl_cmake_platform )
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  if(WIN32)
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    set(sdl_cmake_platform Windows)
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  elseif(PSP)
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    set(sdl_cmake_platform psp)
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  elseif(APPLE)
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    if(CMAKE_SYSTEM_NAME MATCHES ".*(Darwin|MacOS).*")
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      set(sdl_cmake_platform macOS)
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    elseif(CMAKE_SYSTEM_NAME MATCHES ".*tvOS.*")
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      set(sdl_cmake_platform tvOS)
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    elseif(CMAKE_SYSTEM_NAME MATCHES ".*iOS.*")
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      set(sdl_cmake_platform iOS)
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    elseif(CMAKE_SYSTEM_NAME MATCHES ".*watchOS.*")
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      set(sdl_cmake_platform watchOS)
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    elseif (CMAKE_SYSTEM_NAME MATCHES "visionOS")
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      set(sdl_cmake_platform visionOS)
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    else()
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      message(WARNING "Unknown Apple platform: \"${CMAKE_SYSTEM_NAME}\"")
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    endif()
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  elseif(CMAKE_SYSTEM_NAME MATCHES "Haiku.*")
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    set(sdl_cmake_platform Haiku)
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  elseif(NINTENDO_3DS)
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    set(sdl_cmake_platform n3ds)
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  elseif(PS2)
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    set(sdl_cmake_platform ps2)
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  elseif(VITA)
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    set(sdl_cmake_platform Vita)
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  elseif(CMAKE_SYSTEM_NAME MATCHES ".*Linux")
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    set(sdl_cmake_platform Linux)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "kFreeBSD.*")
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    set(sdl_cmake_platform FreeBSD)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "kNetBSD.*|NetBSD.*")
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    set(sdl_cmake_platform NetBSD)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*")
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    set(sdl_cmake_platform OpenBSD)
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  elseif(CMAKE_SYSTEM_NAME MATCHES ".*GNU.*")
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    set(sdl_cmake_platform GNU)
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  elseif(CMAKE_SYSTEM_NAME MATCHES ".*BSDI.*")
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    set(sdl_cmake_platform BSDi)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "DragonFly.*|FreeBSD")
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    set(sdl_cmake_platform FreeBSD)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "SYSV5.*")
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    set(sdl_cmake_platform SYSV5)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "Solaris.*|SunOS.*")
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    set(sdl_cmake_platform Solaris)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "HP-UX.*")
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    set(sdl_cmake_platform HPUX)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "AIX.*")
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    set(sdl_cmake_platform AIX)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "Minix.*")
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    set(sdl_cmake_platform Minix)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "Android.*")
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    set(sdl_cmake_platform Android)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "Emscripten.*")
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    set(sdl_cmake_platform Emscripten)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "QNX.*")
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    set(sdl_cmake_platform QNX)
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  elseif(CMAKE_SYSTEM_NAME MATCHES "BeOS.*")
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    message(FATAL_ERROR "BeOS support has been removed as of SDL 2.0.2.")
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  endif()
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  if(sdl_cmake_platform)
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    string(TOUPPER "${sdl_cmake_platform}" _upper_platform)
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    set("${_upper_platform}" TRUE PARENT_SCOPE)
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  else()
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    set(sdl_cmake_platform "unknown")
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  endif()
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  set(SDL_CMAKE_PLATFORM "${sdl_cmake_platform}" PARENT_SCOPE)
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endfunction()
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