kc3-lang/SDL/cmake/sdlchecks.cmake

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• Hash : a81fe272
  Author :
  Date : 2021-04-04T00:16:30
  

  configure/cmake: Hook up Emscripten threads (disabled by default). Fixes #3795.

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• cmake/sdlchecks.cmake

• macro(FindLibraryAndSONAME _LIB)
    string(TOUPPER ${_LIB} _UPPERLNAME)
    string(REGEX REPLACE "\\-" "_" _LNAME "${_UPPERLNAME}")
  
    find_library(${_LNAME}_LIB ${_LIB})
    if(${_LNAME}_LIB)
      # reduce the library name for shared linking
  
      get_filename_component(_LIB_REALPATH ${${_LNAME}_LIB} REALPATH)  # resolves symlinks
      get_filename_component(_LIB_JUSTNAME ${_LIB_REALPATH} NAME)
  
      if(APPLE)
        string(REGEX REPLACE "(\\.[0-9]*)\\.[0-9\\.]*dylib$" "\\1.dylib" _LIB_REGEXD "${_LIB_JUSTNAME}")
      else()
        string(REGEX REPLACE "(\\.[0-9]*)\\.[0-9\\.]*$" "\\1" _LIB_REGEXD "${_LIB_JUSTNAME}")
      endif()
  
      SET(_DEBUG_FindSONAME FALSE)
      if(_DEBUG_FindSONAME)
        message_warn("DYNLIB OUTPUTVAR: ${_LIB} ... ${_LNAME}_LIB")
        message_warn("DYNLIB ORIGINAL LIB: ${_LIB} ... ${${_LNAME}_LIB}")
        message_warn("DYNLIB REALPATH LIB: ${_LIB} ... ${_LIB_REALPATH}")
        message_warn("DYNLIB JUSTNAME LIB: ${_LIB} ... ${_LIB_JUSTNAME}")
        message_warn("DYNLIB REGEX'd LIB: ${_LIB} ... ${_LIB_REGEXD}")
      endif()
  
      message(STATUS "dynamic lib${_LIB} -> ${_LIB_REGEXD}")
      set(${_LNAME}_LIB_SONAME ${_LIB_REGEXD})
    endif()
  endmacro()
  
  macro(CheckDLOPEN)
    check_symbol_exists(dlopen "dlfcn.h" HAVE_DLOPEN)
    if(NOT HAVE_DLOPEN)
      foreach(_LIBNAME dl tdl)
        check_library_exists("${_LIBNAME}" "dlopen" "" DLOPEN_LIB)
        if(DLOPEN_LIB)
          list(APPEND EXTRA_LIBS ${_LIBNAME})
          set(_DLLIB ${_LIBNAME})
          set(HAVE_DLOPEN TRUE)
          break()
        endif()
      endforeach()
    endif()
  
    if(HAVE_DLOPEN)
      if(_DLLIB)
        set(CMAKE_REQUIRED_LIBRARIES ${_DLLIB})
      endif()
      check_c_source_compiles("
         #include <dlfcn.h>
         int main(int argc, char **argv) {
           void *handle = dlopen(\"\", RTLD_NOW);
           const char *loaderror = (char *) dlerror();
         }" HAVE_DLOPEN)
      set(CMAKE_REQUIRED_LIBRARIES)
    endif()
  
    if (HAVE_DLOPEN)
      set(SDL_LOADSO_DLOPEN 1)
      set(HAVE_SDL_DLOPEN TRUE)
      file(GLOB DLOPEN_SOURCES ${SDL2_SOURCE_DIR}/src/loadso/dlopen/*.c)
      set(SOURCE_FILES ${SOURCE_FILES} ${DLOPEN_SOURCES})
      set(HAVE_SDL_LOADSO TRUE)
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  macro(CheckOSS)
    if(OSS)
      set(OSS_HEADER_FILE "sys/soundcard.h")
      check_c_source_compiles("
          #include <sys/soundcard.h>
          int main() { int arg = SNDCTL_DSP_SETFRAGMENT; }" OSS_FOUND)
      if(NOT OSS_FOUND)
        set(OSS_HEADER_FILE "soundcard.h")
        check_c_source_compiles("
            #include <soundcard.h>
            int main() { int arg = SNDCTL_DSP_SETFRAGMENT; }" OSS_FOUND)
      endif()
  
      if(OSS_FOUND)
        set(HAVE_OSS TRUE)
        file(GLOB OSS_SOURCES ${SDL2_SOURCE_DIR}/src/audio/dsp/*.c)
        if(OSS_HEADER_FILE STREQUAL "soundcard.h")
          set(SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H 1)
        endif()
        set(SDL_AUDIO_DRIVER_OSS 1)
        set(SOURCE_FILES ${SOURCE_FILES} ${OSS_SOURCES})
        if(NETBSD OR OPENBSD)
          list(APPEND EXTRA_LIBS ossaudio)
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  # Optional:
  # - ALSA_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckALSA)
    if(ALSA)
      CHECK_INCLUDE_FILE(alsa/asoundlib.h HAVE_ASOUNDLIB_H)
      if(HAVE_ASOUNDLIB_H)
        CHECK_LIBRARY_EXISTS(asound snd_pcm_recover "" HAVE_LIBASOUND)
      endif()
      if(HAVE_LIBASOUND)
        set(HAVE_ALSA TRUE)
        file(GLOB ALSA_SOURCES ${SDL2_SOURCE_DIR}/src/audio/alsa/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${ALSA_SOURCES})
        set(SDL_AUDIO_DRIVER_ALSA 1)
        if(ALSA_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic ALSA loading")
          else()
            FindLibraryAndSONAME("asound")
            set(SDL_AUDIO_DRIVER_ALSA_DYNAMIC "\"${ASOUND_LIB_SONAME}\"")
            set(HAVE_ALSA_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LIBS asound)
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - PIPEWIRE_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckPipewire)
      if(PIPEWIRE)
          pkg_check_modules(PKG_PIPEWIRE libpipewire-0.3>=0.3.20)
          if(PKG_PIPEWIRE_FOUND)
              set(HAVE_PIPEWIRE TRUE)
              file(GLOB PIPEWIRE_SOURCES ${SDL2_SOURCE_DIR}/src/audio/pipewire/*.c)
              set(SOURCE_FILES ${SOURCE_FILES} ${PIPEWIRE_SOURCES})
              set(SDL_AUDIO_DRIVER_PIPEWIRE 1)
              list(APPEND EXTRA_CFLAGS ${PKG_PIPEWIRE_CFLAGS})
              if(PIPEWIRE_SHARED)
                  if(NOT HAVE_DLOPEN)
                      message_warn("You must have SDL_LoadObject() support for dynamic Pipewire loading")
                  else()
                      FindLibraryAndSONAME("pipewire-0.3")
                      set(SDL_AUDIO_DRIVER_PIPEWIRE_DYNAMIC "\"${PIPEWIRE_0.3_LIB_SONAME}\"")
                      set(HAVE_PIPEWIRE_SHARED TRUE)
                  endif()
              else()
                  list(APPEND EXTRA_LDFLAGS ${PKG_PIPEWIRE_LDFLAGS})
              endif()
              set(HAVE_SDL_AUDIO TRUE)
          endif()
      endif()
  endmacro()
  
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - PULSEAUDIO_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckPulseAudio)
    if(PULSEAUDIO)
      pkg_check_modules(PKG_PULSEAUDIO libpulse-simple)
      if(PKG_PULSEAUDIO_FOUND)
        set(HAVE_PULSEAUDIO TRUE)
        file(GLOB PULSEAUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/pulseaudio/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${PULSEAUDIO_SOURCES})
        set(SDL_AUDIO_DRIVER_PULSEAUDIO 1)
        list(APPEND EXTRA_CFLAGS ${PKG_PULSEAUDIO_CFLAGS})
        if(PULSEAUDIO_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic PulseAudio loading")
          else()
            FindLibraryAndSONAME("pulse-simple")
            set(SDL_AUDIO_DRIVER_PULSEAUDIO_DYNAMIC "\"${PULSE_SIMPLE_LIB_SONAME}\"")
            set(HAVE_PULSEAUDIO_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${PKG_PULSEAUDIO_LDFLAGS})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - JACK_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckJACK)
    if(JACK)
      pkg_check_modules(PKG_JACK jack)
      if(PKG_JACK_FOUND)
        set(HAVE_JACK TRUE)
        file(GLOB JACK_SOURCES ${SDL2_SOURCE_DIR}/src/audio/jack/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${JACK_SOURCES})
        set(SDL_AUDIO_DRIVER_JACK 1)
        list(APPEND EXTRA_CFLAGS ${PKG_JACK_CFLAGS})
        if(JACK_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic JACK audio loading")
          else()
            FindLibraryAndSONAME("jack")
            set(SDL_AUDIO_DRIVER_JACK_DYNAMIC "\"${JACK_LIB_SONAME}\"")
            set(HAVE_JACK_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${PKG_JACK_LDFLAGS})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - ESD_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckESD)
    if(ESD)
      pkg_check_modules(PKG_ESD esound)
      if(PKG_ESD_FOUND)
        set(HAVE_ESD TRUE)
        file(GLOB ESD_SOURCES ${SDL2_SOURCE_DIR}/src/audio/esd/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${ESD_SOURCES})
        set(SDL_AUDIO_DRIVER_ESD 1)
        list(APPEND EXTRA_CFLAGS ${PKG_ESD_CFLAGS})
        if(ESD_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic ESD loading")
          else()
            FindLibraryAndSONAME(esd)
            set(SDL_AUDIO_DRIVER_ESD_DYNAMIC "\"${ESD_LIB_SONAME}\"")
            set(HAVE_ESD_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${PKG_ESD_LDFLAGS})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  # Optional:
  # - ARTS_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckARTS)
    if(ARTS)
      find_program(ARTS_CONFIG arts-config)
      if(ARTS_CONFIG)
        execute_process(CMD_ARTSCFLAGS ${ARTS_CONFIG} --cflags
          OUTPUT_VARIABLE ARTS_CFLAGS OUTPUT_STRIP_TRAILING_WHITESPACE)
        list(APPEND EXTRA_CFLAGS ${ARTS_CFLAGS})
        execute_process(CMD_ARTSLIBS ${ARTS_CONFIG} --libs
          OUTPUT_VARIABLE ARTS_LIBS OUTPUT_STRIP_TRAILING_WHITESPACE)
        file(GLOB ARTS_SOURCES ${SDL2_SOURCE_DIR}/src/audio/arts/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${ARTS_SOURCES})
        set(SDL_AUDIO_DRIVER_ARTS 1)
        set(HAVE_ARTS TRUE)
        if(ARTS_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic ARTS loading")
          else()
            # TODO
            FindLibraryAndSONAME(artsc)
            set(SDL_AUDIO_DRIVER_ARTS_DYNAMIC "\"${ARTSC_LIB_SONAME}\"")
            set(HAVE_ARTS_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${ARTS_LIBS})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  # Optional:
  # - NAS_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckNAS)
    if(NAS)
      # TODO: set include paths properly, so the NAS headers are found
      check_include_file(audio/audiolib.h HAVE_NAS_H)
      find_library(D_NAS_LIB audio)
      if(HAVE_NAS_H AND D_NAS_LIB)
        set(HAVE_NAS TRUE)
        file(GLOB NAS_SOURCES ${SDL2_SOURCE_DIR}/src/audio/nas/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${NAS_SOURCES})
        set(SDL_AUDIO_DRIVER_NAS 1)
        if(NAS_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic NAS loading")
          else()
            FindLibraryAndSONAME("audio")
            set(SDL_AUDIO_DRIVER_NAS_DYNAMIC "\"${AUDIO_LIB_SONAME}\"")
            set(HAVE_NAS_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LIBS ${D_NAS_LIB})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  # Optional:
  # - SNDIO_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckSNDIO)
    if(SNDIO)
      # TODO: set include paths properly, so the sndio headers are found
      check_include_file(sndio.h HAVE_SNDIO_H)
      find_library(D_SNDIO_LIB sndio)
      if(HAVE_SNDIO_H AND D_SNDIO_LIB)
        set(HAVE_SNDIO TRUE)
        file(GLOB SNDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/sndio/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${SNDIO_SOURCES})
        set(SDL_AUDIO_DRIVER_SNDIO 1)
        if(SNDIO_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic sndio loading")
          else()
            FindLibraryAndSONAME("sndio")
            set(SDL_AUDIO_DRIVER_SNDIO_DYNAMIC "\"${SNDIO_LIB_SONAME}\"")
            set(HAVE_SNDIO_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LIBS ${D_SNDIO_LIB})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - FUSIONSOUND_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckFusionSound)
    if(FUSIONSOUND)
      pkg_check_modules(PKG_FUSIONSOUND fusionsound>=1.0.0)
      if(PKG_FUSIONSOUND_FOUND)
        set(HAVE_FUSIONSOUND TRUE)
        file(GLOB FUSIONSOUND_SOURCES ${SDL2_SOURCE_DIR}/src/audio/fusionsound/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${FUSIONSOUND_SOURCES})
        set(SDL_AUDIO_DRIVER_FUSIONSOUND 1)
        list(APPEND EXTRA_CFLAGS ${PKG_FUSIONSOUND_CFLAGS})
        if(FUSIONSOUND_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic FusionSound loading")
          else()
            FindLibraryAndSONAME("fusionsound")
            set(SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC "\"${FUSIONSOUND_LIB_SONAME}\"")
            set(HAVE_FUSIONSOUND_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${PKG_FUSIONSOUND_LDFLAGS})
        endif()
        set(HAVE_SDL_AUDIO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - LIBSAMPLERATE
  # Optional:
  # - LIBSAMPLERATE_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckLibSampleRate)
    if(LIBSAMPLERATE)
      check_include_file(samplerate.h HAVE_LIBSAMPLERATE_H)
      if(HAVE_LIBSAMPLERATE_H)
        set(HAVE_LIBSAMPLERATE TRUE)
        if(LIBSAMPLERATE_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic libsamplerate loading")
          else()
            FindLibraryAndSONAME("samplerate")
            set(SDL_LIBSAMPLERATE_DYNAMIC "\"${SAMPLERATE_LIB_SONAME}\"")
            set(HAVE_LIBSAMPLERATE_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS -lsamplerate)
        endif()
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  # Optional:
  # - X11_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckX11)
    if(VIDEO_X11)
      foreach(_LIB X11 Xext Xcursor Xinerama Xi Xrandr Xrender Xss Xxf86vm)
          FindLibraryAndSONAME("${_LIB}")
      endforeach()
  
      find_path(X_INCLUDEDIR X11/Xlib.h
          /usr/pkg/xorg/include
          /usr/X11R6/include
          /usr/X11R7/include
          /usr/local/include/X11
          /usr/include/X11
          /usr/openwin/include
          /usr/openwin/share/include
          /opt/graphics/OpenGL/include
          /opt/X11/include
      )
  
      if(X_INCLUDEDIR)
        list(APPEND EXTRA_CFLAGS "-I${X_INCLUDEDIR}")
        list(APPEND CMAKE_REQUIRED_INCLUDES "${X_INCLUDEDIR}")
      endif()
  
      check_include_file(X11/Xcursor/Xcursor.h HAVE_XCURSOR_H)
      check_include_file(X11/extensions/Xinerama.h HAVE_XINERAMA_H)
      check_include_file(X11/extensions/XInput2.h HAVE_XINPUT2_H)
      check_include_file(X11/extensions/Xrandr.h HAVE_XRANDR_H)
      check_include_file(X11/extensions/Xrender.h HAVE_XRENDER_H)
      check_include_file(X11/extensions/scrnsaver.h HAVE_XSS_H)
      check_include_file(X11/extensions/shape.h HAVE_XSHAPE_H)
      check_include_files("X11/Xlib.h;X11/extensions/xf86vmode.h" HAVE_XF86VM_H)
      check_include_files("X11/Xlib.h;X11/Xproto.h;X11/extensions/Xext.h" HAVE_XEXT_H)
  
      if(X11_LIB)
        if(NOT HAVE_XEXT_H)
          message_error("Missing Xext.h, maybe you need to install the libxext-dev package?")
        endif()
  
        set(HAVE_VIDEO_X11 TRUE)
        set(HAVE_SDL_VIDEO TRUE)
  
        file(GLOB X11_SOURCES ${SDL2_SOURCE_DIR}/src/video/x11/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${X11_SOURCES})
        set(SDL_VIDEO_DRIVER_X11 1)
  
        if(APPLE)
          set(X11_SHARED OFF)
        endif()
  
        check_symbol_exists(shmat "sys/shm.h" HAVE_SHMAT)
        if(NOT HAVE_SHMAT)
          check_library_exists(ipc shmat "" HAVE_SHMAT)
          if(HAVE_SHMAT)
            list(APPEND EXTRA_LIBS ipc)
          endif()
          if(NOT HAVE_SHMAT)
            add_definitions(-DNO_SHARED_MEMORY)
            list(APPEND EXTRA_CFLAGS "-DNO_SHARED_MEMORY")
          endif()
        endif()
  
        if(X11_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic X11 loading")
            set(HAVE_X11_SHARED FALSE)
          else()
            set(HAVE_X11_SHARED TRUE)
          endif()
          if(HAVE_X11_SHARED)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC "\"${X11_LIB_SONAME}\"")
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT "\"${XEXT_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${X11_LIB} ${XEXT_LIB})
          endif()
        endif()
  
        set(CMAKE_REQUIRED_LIBRARIES ${X11_LIB} ${X11_LIB})
        check_c_source_compiles("
            #include <X11/Xlib.h>
            #include <X11/Xproto.h>
            #include <X11/extensions/Xext.h>
            #include <X11/extensions/extutil.h>
            extern XExtDisplayInfo* XextAddDisplay(XExtensionInfo* a,Display* b,_Xconst char* c,XExtensionHooks* d,int e,XPointer f);
            int main(int argc, char **argv) {}" HAVE_CONST_XEXT_ADDDISPLAY)
        if(HAVE_CONST_XEXT_ADDDISPLAY)
          set(SDL_VIDEO_DRIVER_X11_CONST_PARAM_XEXTADDDISPLAY 1)
        endif()
  
        check_c_source_compiles("
            #include <X11/Xlib.h>
            int main(int argc, char **argv) {
              Display *display;
              XEvent event;
              XGenericEventCookie *cookie = &event.xcookie;
              XNextEvent(display, &event);
              XGetEventData(display, cookie);
              XFreeEventData(display, cookie); }" HAVE_XGENERICEVENT)
        if(HAVE_XGENERICEVENT)
          set(SDL_VIDEO_DRIVER_X11_SUPPORTS_GENERIC_EVENTS 1)
        endif()
  
        check_symbol_exists(XkbKeycodeToKeysym "X11/Xlib.h;X11/XKBlib.h" SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM)
  
        if(VIDEO_X11_XCURSOR AND HAVE_XCURSOR_H)
          set(HAVE_VIDEO_X11_XCURSOR TRUE)
          if(HAVE_X11_SHARED AND XCURSOR_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR "\"${XCURSOR_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XCURSOR_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XCURSOR 1)
        endif()
  
        if(VIDEO_X11_XINERAMA AND HAVE_XINERAMA_H)
          set(HAVE_VIDEO_X11_XINERAMA TRUE)
          if(HAVE_X11_SHARED AND XINERAMA_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA "\"${XINERAMA_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XINERAMA_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XINERAMA 1)
        endif()
  
        if(VIDEO_X11_XINPUT AND HAVE_XINPUT2_H)
          set(HAVE_VIDEO_X11_XINPUT TRUE)
          if(HAVE_X11_SHARED AND XI_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 "\"${XI_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XI_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XINPUT2 1)
  
          # Check for multitouch
          check_c_source_compiles("
              #include <X11/Xlib.h>
              #include <X11/Xproto.h>
              #include <X11/extensions/XInput2.h>
              int event_type = XI_TouchBegin;
              XITouchClassInfo *t;
              Status XIAllowTouchEvents(Display *a,int b,unsigned int c,Window d,int f)
              {
                return (Status)0;
              }
              int main(int argc, char **argv) {}" HAVE_XINPUT2_MULTITOUCH)
          if(HAVE_XINPUT2_MULTITOUCH)
            set(SDL_VIDEO_DRIVER_X11_XINPUT2_SUPPORTS_MULTITOUCH 1)
          endif()
        endif()
  
        if(VIDEO_X11_XRANDR AND HAVE_XRANDR_H)
          if(HAVE_X11_SHARED AND XRANDR_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR "\"${XRANDR_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XRANDR_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XRANDR 1)
          set(HAVE_VIDEO_X11_XRANDR TRUE)
        endif()
  
        if(VIDEO_X11_XSCRNSAVER AND HAVE_XSS_H)
          if(HAVE_X11_SHARED AND XSS_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS "\"${XSS_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XSS_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XSCRNSAVER 1)
          set(HAVE_VIDEO_X11_XSCRNSAVER TRUE)
        endif()
  
        if(VIDEO_X11_XSHAPE AND HAVE_XSHAPE_H)
          set(SDL_VIDEO_DRIVER_X11_XSHAPE 1)
          set(HAVE_VIDEO_X11_XSHAPE TRUE)
        endif()
  
        if(VIDEO_X11_XVM AND HAVE_XF86VM_H)
          if(HAVE_X11_SHARED AND XXF86VM_LIB)
            set(SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE "\"${XXF86VM_LIB_SONAME}\"")
          else()
            list(APPEND EXTRA_LIBS ${XXF86VM_LIB})
          endif()
          set(SDL_VIDEO_DRIVER_X11_XVIDMODE 1)
          set(HAVE_VIDEO_X11_XVM TRUE)
        endif()
  
        set(CMAKE_REQUIRED_LIBRARIES)
      endif()
    endif()
  endmacro()
  
  macro(WaylandProtocolGen _SCANNER _CODE_MODE _XML _PROTL)
      set(_WAYLAND_PROT_C_CODE "${CMAKE_CURRENT_BINARY_DIR}/wayland-generated-protocols/${_PROTL}-protocol.c")
      set(_WAYLAND_PROT_H_CODE "${CMAKE_CURRENT_BINARY_DIR}/wayland-generated-protocols/${_PROTL}-client-protocol.h")
  
      add_custom_command(
          OUTPUT "${_WAYLAND_PROT_H_CODE}"
          DEPENDS "${_XML}"
          COMMAND "${_SCANNER}"
          ARGS client-header "${_XML}" "${_WAYLAND_PROT_H_CODE}"
      )
  
      add_custom_command(
          OUTPUT "${_WAYLAND_PROT_C_CODE}"
          DEPENDS "${_WAYLAND_PROT_H_CODE}"
          COMMAND "${_SCANNER}"
          ARGS "${_CODE_MODE}" "${_XML}" "${_WAYLAND_PROT_C_CODE}"
      )
  
      set(SOURCE_FILES ${SOURCE_FILES} "${_WAYLAND_PROT_C_CODE}")
  endmacro()
  
  # Requires:
  # - EGL
  # - PkgCheckModules
  # Optional:
  # - WAYLAND_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckWayland)
    if(VIDEO_WAYLAND)
      pkg_check_modules(WAYLAND wayland-client wayland-scanner wayland-egl wayland-cursor egl xkbcommon)
      pkg_check_modules(WAYLAND_SCANNER_1_15 "wayland-scanner>=1.15")
  
      if(WAYLAND_FOUND)
        execute_process(
          COMMAND ${PKG_CONFIG_EXECUTABLE} --variable=wayland_scanner wayland-scanner
          WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
          RESULT_VARIABLE WAYLAND_SCANNER_RC
          OUTPUT_VARIABLE WAYLAND_SCANNER
          ERROR_QUIET
          OUTPUT_STRIP_TRAILING_WHITESPACE
        )
        if(NOT WAYLAND_SCANNER_RC EQUAL 0)
          set(WAYLAND_FOUND FALSE)
        endif()
      endif()
  
      if(WAYLAND_FOUND)
        if(WAYLAND_SCANNER_1_15_FOUND)
          set(WAYLAND_SCANNER_CODE_MODE "private-code")
        else()
          set(WAYLAND_SCANNER_CODE_MODE "code")
        endif()
  
        link_directories(
            ${WAYLAND_LIBRARY_DIRS}
        )
        include_directories(
            ${WAYLAND_INCLUDE_DIRS}
        )
        set(HAVE_VIDEO_WAYLAND TRUE)
        set(HAVE_SDL_VIDEO TRUE)
  
        file(GLOB WAYLAND_SOURCES ${SDL2_SOURCE_DIR}/src/video/wayland/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${WAYLAND_SOURCES})
  
        # We have to generate some protocol interface code for some unstable Wayland features.
        file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/wayland-generated-protocols")
        include_directories("${CMAKE_CURRENT_BINARY_DIR}/wayland-generated-protocols")
  
        file(GLOB WAYLAND_PROTOCOLS_XML RELATIVE "${SDL2_SOURCE_DIR}/wayland-protocols/" "${SDL2_SOURCE_DIR}/wayland-protocols/*.xml")
        foreach(_XML ${WAYLAND_PROTOCOLS_XML})
          string(REGEX REPLACE "\\.xml$" "" _PROTL "${_XML}")
          WaylandProtocolGen("${WAYLAND_SCANNER}" "${WAYLAND_SCANNER_CODE_MODE}" "${SDL2_SOURCE_DIR}/wayland-protocols/${_XML}" "${_PROTL}")
        endforeach()
  
        if(VIDEO_WAYLAND_QT_TOUCH)
            set(HAVE_VIDEO_WAYLAND_QT_TOUCH TRUE)
            set(SDL_VIDEO_DRIVER_WAYLAND_QT_TOUCH 1)
        endif()
  
        if(WAYLAND_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic Wayland loading")
          else()
            FindLibraryAndSONAME(wayland-client)
            FindLibraryAndSONAME(wayland-egl)
            FindLibraryAndSONAME(wayland-cursor)
            FindLibraryAndSONAME(xkbcommon)
            set(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC "\"${WAYLAND_CLIENT_LIB_SONAME}\"")
            set(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL "\"${WAYLAND_EGL_LIB_SONAME}\"")
            set(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR "\"${WAYLAND_CURSOR_LIB_SONAME}\"")
            set(SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON "\"${XKBCOMMON_LIB_SONAME}\"")
            set(HAVE_WAYLAND_SHARED TRUE)
          endif()
        else()
          set(EXTRA_LIBS ${WAYLAND_LIBRARIES} ${EXTRA_LIBS})
        endif()
  
        set(SDL_VIDEO_DRIVER_WAYLAND 1)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  #
  macro(CheckCOCOA)
    if(VIDEO_COCOA)
      if(APPLE) # Apple always has Cocoa.
        set(HAVE_VIDEO_COCOA TRUE)
      endif()
      if(HAVE_VIDEO_COCOA)
        file(GLOB COCOA_SOURCES ${SDL2_SOURCE_DIR}/src/video/cocoa/*.m)
        set_source_files_properties(${COCOA_SOURCES} PROPERTIES LANGUAGE C)
        set(SOURCE_FILES ${SOURCE_FILES} ${COCOA_SOURCES})
        set(SDL_VIDEO_DRIVER_COCOA 1)
        set(HAVE_SDL_VIDEO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  # Optional:
  # - DIRECTFB_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckDirectFB)
    if(VIDEO_DIRECTFB)
      pkg_check_modules(PKG_DIRECTFB directfb>=1.0.0)
      if(PKG_DIRECTFB_FOUND)
        set(HAVE_VIDEO_DIRECTFB TRUE)
        file(GLOB DIRECTFB_SOURCES ${SDL2_SOURCE_DIR}/src/video/directfb/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${DIRECTFB_SOURCES})
        set(SDL_VIDEO_DRIVER_DIRECTFB 1)
        set(SDL_VIDEO_RENDER_DIRECTFB 1)
        list(APPEND EXTRA_CFLAGS ${PKG_DIRECTFB_CFLAGS})
        if(DIRECTFB_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic DirectFB loading")
          else()
            FindLibraryAndSONAME("directfb")
            set(SDL_VIDEO_DRIVER_DIRECTFB_DYNAMIC "\"${DIRECTFB_LIB_SONAME}\"")
            set(HAVE_DIRECTFB_SHARED TRUE)
          endif()
        else()
          list(APPEND EXTRA_LDFLAGS ${PKG_DIRECTFB_LDFLAGS})
        endif()
        set(HAVE_SDL_VIDEO TRUE)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - n/a
  macro(CheckVivante)
    if(VIDEO_VIVANTE)
      check_c_source_compiles("
          #include <gc_vdk.h>
          int main(int argc, char** argv) {}" HAVE_VIDEO_VIVANTE_VDK)
      check_c_source_compiles("
          #define LINUX
          #define EGL_API_FB
          #include <EGL/eglvivante.h>
          int main(int argc, char** argv) {}" HAVE_VIDEO_VIVANTE_EGL_FB)
      if(HAVE_VIDEO_VIVANTE_VDK OR HAVE_VIDEO_VIVANTE_EGL_FB)
        set(HAVE_VIDEO_VIVANTE TRUE)
        set(HAVE_SDL_VIDEO TRUE)
  
        file(GLOB VIVANTE_SOURCES ${SDL2_SOURCE_DIR}/src/video/vivante/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${VIVANTE_SOURCES})
        set(SDL_VIDEO_DRIVER_VIVANTE 1)
        if(HAVE_VIDEO_VIVANTE_VDK)
          set(SDL_VIDEO_DRIVER_VIVANTE_VDK 1)
          list(APPEND EXTRA_LIBS VDK VIVANTE)
        else()
          set(SDL_CFLAGS "${SDL_CFLAGS} -DLINUX -DEGL_API_FB")
          list(APPEND EXTRA_LIBS EGL)
        endif(HAVE_VIDEO_VIVANTE_VDK)
      endif(HAVE_VIDEO_VIVANTE_VDK OR HAVE_VIDEO_VIVANTE_EGL_FB)
    endif(VIDEO_VIVANTE)
  endmacro(CheckVivante)
  
  # Requires:
  # - libglvnd
  macro(CheckOpenGLKMSDRM)
    if(VIDEO_OPENGL AND HAVE_VIDEO_KMSDRM)
      check_c_source_compiles("
          #include <GL/gl.h>
          int main(int argc, char** argv) {}" HAVE_VIDEO_OPENGL)
  
      if(HAVE_VIDEO_OPENGL)
        set(HAVE_VIDEO_OPENGL TRUE)
        set(SDL_VIDEO_OPENGL 1)
        set(SDL_VIDEO_RENDER_OGL 1)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - nada
  macro(CheckOpenGLX11)
    if(VIDEO_OPENGL)
      check_c_source_compiles("
          #include <GL/gl.h>
          #include <GL/glx.h>
          int main(int argc, char** argv) {}" HAVE_VIDEO_OPENGL)
  
      if(HAVE_VIDEO_OPENGL)
        set(HAVE_VIDEO_OPENGL TRUE)
        set(SDL_VIDEO_OPENGL 1)
        set(SDL_VIDEO_OPENGL_GLX 1)
        set(SDL_VIDEO_RENDER_OGL 1)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  macro(CheckEGL)
    pkg_check_modules(EGL egl)
    string(REPLACE "-D_THREAD_SAFE;" "-D_THREAD_SAFE=1;" EGL_CFLAGS "${EGL_CFLAGS}")
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  macro(CheckEGLKMSDRM)
    if (HAVE_VIDEO_OPENGLES OR HAVE_VIDEO_OPENGL)
      CheckEGL()
      set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${EGL_CFLAGS}")
      check_c_source_compiles("
  	#define EGL_API_FB
  	#define MESA_EGL_NO_X11_HEADERS
  	#define EGL_NO_X11
  	#include <EGL/egl.h>
  	#include <EGL/eglext.h>
  	int main (int argc, char** argv) {}" HAVE_VIDEO_OPENGL_EGL)
      if(HAVE_VIDEO_OPENGL_EGL)
  	set(SDL_VIDEO_OPENGL_EGL 1)
      endif()
    endif()
  endmacro()
  
  # Requires:
  # - PkgCheckModules
  macro(CheckOpenGLESX11)
    CheckEGL()
    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${EGL_CFLAGS}")
    if(VIDEO_OPENGLES)
      check_c_source_compiles("
          #define EGL_API_FB
          #include <EGL/egl.h>
          int main (int argc, char** argv) {}" HAVE_VIDEO_OPENGL_EGL)
      if(HAVE_VIDEO_OPENGL_EGL)
          set(SDL_VIDEO_OPENGL_EGL 1)
      endif()
      check_c_source_compiles("
        #include <GLES/gl.h>
        #include <GLES/glext.h>
        int main (int argc, char** argv) {}" HAVE_VIDEO_OPENGLES_V1)
      if(HAVE_VIDEO_OPENGLES_V1)
          set(HAVE_VIDEO_OPENGLES TRUE)
          set(SDL_VIDEO_OPENGL_ES 1)
          set(SDL_VIDEO_RENDER_OGL_ES 1)
      endif()
      check_c_source_compiles("
        #include <GLES2/gl2.h>
        #include <GLES2/gl2ext.h>
        int main (int argc, char** argv) {}" HAVE_VIDEO_OPENGLES_V2)
      if(HAVE_VIDEO_OPENGLES_V2)
          set(HAVE_VIDEO_OPENGLES TRUE)
          set(SDL_VIDEO_OPENGL_ES2 1)
          set(SDL_VIDEO_RENDER_OGL_ES2 1)
      endif()
  
    endif()
  endmacro()
  
  # Requires:
  # - nada
  # Optional:
  # - THREADS opt
  # Sets:
  # PTHREAD_CFLAGS
  # PTHREAD_LIBS
  macro(CheckPTHREAD)
    if(PTHREADS)
      if(ANDROID)
        # the android libc provides built-in support for pthreads, so no
        # additional linking or compile flags are necessary
      elseif(LINUX)
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "-pthread")
      elseif(BSDI)
        set(PTHREAD_CFLAGS "-D_REENTRANT -D_THREAD_SAFE")
        set(PTHREAD_LDFLAGS "")
      elseif(DARWIN)
        set(PTHREAD_CFLAGS "-D_THREAD_SAFE")
        # causes Carbon.p complaints?
        # set(PTHREAD_CFLAGS "-D_REENTRANT -D_THREAD_SAFE")
        set(PTHREAD_LDFLAGS "")
      elseif(FREEBSD)
        set(PTHREAD_CFLAGS "-D_REENTRANT -D_THREAD_SAFE")
        set(PTHREAD_LDFLAGS "-pthread")
      elseif(NETBSD)
        set(PTHREAD_CFLAGS "-D_REENTRANT -D_THREAD_SAFE")
        set(PTHREAD_LDFLAGS "-lpthread")
      elseif(OPENBSD)
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "-pthread")
      elseif(SOLARIS)
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "-pthread -lposix4")
      elseif(SYSV5)
        set(PTHREAD_CFLAGS "-D_REENTRANT -Kthread")
        set(PTHREAD_LDFLAGS "")
      elseif(AIX)
        set(PTHREAD_CFLAGS "-D_REENTRANT -mthreads")
        set(PTHREAD_LDFLAGS "-pthread")
      elseif(HPUX)
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "-L/usr/lib -pthread")
      elseif(HAIKU)
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "")
      elseif(EMSCRIPTEN)
        set(PTHREAD_CFLAGS "-D_REENTRANT -pthread")
        set(PTHREAD_LDFLAGS "-pthread")
      else()
        set(PTHREAD_CFLAGS "-D_REENTRANT")
        set(PTHREAD_LDFLAGS "-lpthread")
      endif()
  
      # Run some tests
      set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
      set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${PTHREAD_CFLAGS} ${PTHREAD_LDFLAGS}")
      if(CMAKE_CROSSCOMPILING)
        set(HAVE_PTHREADS 1)
      else()
        check_c_source_runs("
          #include <pthread.h>
          int main(int argc, char** argv) {
            pthread_attr_t type;
            pthread_attr_init(&type);
            return 0;
          }" HAVE_PTHREADS)
      endif()
      if(HAVE_PTHREADS)
        set(SDL_THREAD_PTHREAD 1)
        list(APPEND EXTRA_CFLAGS ${PTHREAD_CFLAGS})
        list(APPEND EXTRA_LDFLAGS ${PTHREAD_LDFLAGS})
        set(SDL_CFLAGS "${SDL_CFLAGS} ${PTHREAD_CFLAGS}")
        list(APPEND SDL_LIBS ${PTHREAD_LDFLAGS})
  
        check_c_source_compiles("
          #include <pthread.h>
          int main(int argc, char **argv) {
            pthread_mutexattr_t attr;
            pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
            return 0;
          }" HAVE_RECURSIVE_MUTEXES)
        if(HAVE_RECURSIVE_MUTEXES)
          set(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX 1)
        else()
          check_c_source_compiles("
              #include <pthread.h>
              int main(int argc, char **argv) {
                pthread_mutexattr_t attr;
                pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
                return 0;
              }" HAVE_RECURSIVE_MUTEXES_NP)
          if(HAVE_RECURSIVE_MUTEXES_NP)
            set(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP 1)
          endif()
        endif()
  
        if(PTHREADS_SEM)
          check_c_source_compiles("#include <pthread.h>
                                   #include <semaphore.h>
                                   int main(int argc, char **argv) { return 0; }" HAVE_PTHREADS_SEM)
          if(HAVE_PTHREADS_SEM)
            check_c_source_compiles("
                #include <pthread.h>
                #include <semaphore.h>
                int main(int argc, char **argv) {
                    sem_timedwait(NULL, NULL);
                    return 0;
                }" HAVE_SEM_TIMEDWAIT)
          endif()
        endif()
  
        check_include_files("pthread.h" HAVE_PTHREAD_H)
        check_include_files("pthread_np.h" HAVE_PTHREAD_NP_H)
        if (HAVE_PTHREAD_H)
          check_symbol_exists(pthread_setname_np "pthread.h" HAVE_PTHREAD_SETNAME_NP)
          if (HAVE_PTHREAD_NP_H)
            check_symbol_exists(pthread_set_name_np "pthread.h;pthread_np.h" HAVE_PTHREAD_SET_NAME_NP)
          endif()
        endif()
  
        set(SOURCE_FILES ${SOURCE_FILES}
            ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_systhread.c
            ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_sysmutex.c   # Can be faked, if necessary
            ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_syscond.c    # Can be faked, if necessary
            ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_systls.c
            )
        if(HAVE_PTHREADS_SEM)
          set(SOURCE_FILES ${SOURCE_FILES}
              ${SDL2_SOURCE_DIR}/src/thread/pthread/SDL_syssem.c)
        else()
          set(SOURCE_FILES ${SOURCE_FILES}
              ${SDL2_SOURCE_DIR}/src/thread/generic/SDL_syssem.c)
        endif()
        set(HAVE_SDL_THREADS TRUE)
      endif()
      set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
    endif()
  endmacro()
  
  # Requires
  # - nada
  # Optional:
  # Sets:
  # USB_LIBS
  # USB_CFLAGS
  macro(CheckUSBHID)
    check_library_exists(usbhid hid_init "" LIBUSBHID)
    if(LIBUSBHID)
      check_include_file(usbhid.h HAVE_USBHID_H)
      if(HAVE_USBHID_H)
        set(USB_CFLAGS "-DHAVE_USBHID_H")
      endif()
  
      check_include_file(libusbhid.h HAVE_LIBUSBHID_H)
      if(HAVE_LIBUSBHID_H)
        set(USB_CFLAGS "${USB_CFLAGS} -DHAVE_LIBUSBHID_H")
      endif()
      set(USB_LIBS ${USB_LIBS} usbhid)
    else()
      check_include_file(usb.h HAVE_USB_H)
      if(HAVE_USB_H)
        set(USB_CFLAGS "-DHAVE_USB_H")
      endif()
      check_include_file(libusb.h HAVE_LIBUSB_H)
      if(HAVE_LIBUSB_H)
        set(USB_CFLAGS "${USB_CFLAGS} -DHAVE_LIBUSB_H")
      endif()
      check_library_exists(usb hid_init "" LIBUSB)
      if(LIBUSB)
        set(USB_LIBS ${USB_LIBS} usb)
      endif()
    endif()
  
    set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${USB_CFLAGS}")
    set(CMAKE_REQUIRED_LIBRARIES "${USB_LIBS}")
    check_c_source_compiles("
         #include <sys/types.h>
          #if defined(HAVE_USB_H)
          #include <usb.h>
          #endif
          #ifdef __DragonFly__
          # include <bus/u4b/usb.h>
          # include <bus/u4b/usbhid.h>
          #else
          # include <dev/usb/usb.h>
          # include <dev/usb/usbhid.h>
          #endif
          #if defined(HAVE_USBHID_H)
          #include <usbhid.h>
          #elif defined(HAVE_LIBUSB_H)
          #include <libusb.h>
          #elif defined(HAVE_LIBUSBHID_H)
          #include <libusbhid.h>
          #endif
          int main(int argc, char **argv) {
            struct report_desc *repdesc;
            struct usb_ctl_report *repbuf;
            hid_kind_t hidkind;
            return 0;
          }" HAVE_USBHID)
    if(HAVE_USBHID)
      check_c_source_compiles("
            #include <sys/types.h>
            #if defined(HAVE_USB_H)
            #include <usb.h>
            #endif
            #ifdef __DragonFly__
            # include <bus/u4b/usb.h>
            # include <bus/u4b/usbhid.h>
            #else
            # include <dev/usb/usb.h>
            # include <dev/usb/usbhid.h>
            #endif
            #if defined(HAVE_USBHID_H)
            #include <usbhid.h>
            #elif defined(HAVE_LIBUSB_H)
            #include <libusb.h>
            #elif defined(HAVE_LIBUSBHID_H)
            #include <libusbhid.h>
            #endif
            int main(int argc, char** argv) {
              struct usb_ctl_report buf;
              if (buf.ucr_data) { }
              return 0;
            }" HAVE_USBHID_UCR_DATA)
      if(HAVE_USBHID_UCR_DATA)
        set(USB_CFLAGS "${USB_CFLAGS} -DUSBHID_UCR_DATA")
      endif()
  
      check_c_source_compiles("
            #include <sys/types.h>
            #if defined(HAVE_USB_H)
            #include <usb.h>
            #endif
            #ifdef __DragonFly__
            #include <bus/u4b/usb.h>
            #include <bus/u4b/usbhid.h>
            #else
            #include <dev/usb/usb.h>
            #include <dev/usb/usbhid.h>
            #endif
            #if defined(HAVE_USBHID_H)
            #include <usbhid.h>
            #elif defined(HAVE_LIBUSB_H)
            #include <libusb.h>
            #elif defined(HAVE_LIBUSBHID_H)
            #include <libusbhid.h>
            #endif
            int main(int argc, char **argv) {
              report_desc_t d;
              hid_start_parse(d, 1, 1);
              return 0;
            }" HAVE_USBHID_NEW)
      if(HAVE_USBHID_NEW)
        set(USB_CFLAGS "${USB_CFLAGS} -DUSBHID_NEW")
      endif()
  
      check_c_source_compiles("
          #include <machine/joystick.h>
          int main(int argc, char** argv) {
              struct joystick t;
              return 0;
          }" HAVE_MACHINE_JOYSTICK)
      if(HAVE_MACHINE_JOYSTICK)
        set(SDL_HAVE_MACHINE_JOYSTICK_H 1)
      endif()
      set(SDL_JOYSTICK_USBHID 1)
      file(GLOB BSD_JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/bsd/*.c)
      set(SOURCE_FILES ${SOURCE_FILES} ${BSD_JOYSTICK_SOURCES})
      list(APPEND EXTRA_CFLAGS ${USB_CFLAGS})
      list(APPEND EXTRA_LIBS ${USB_LIBS})
      set(HAVE_SDL_JOYSTICK TRUE)
  
      set(CMAKE_REQUIRED_LIBRARIES)
      set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
    endif()
  endmacro()
  
  # Check for HIDAPI joystick drivers. This is currently a Unix thing, not Windows or macOS!
  macro(CheckHIDAPI)
    if(HIDAPI)
      if(HIDAPI_SKIP_LIBUSB)
        set(HAVE_HIDAPI TRUE)
      else()
        set(HAVE_HIDAPI FALSE)
        pkg_check_modules(LIBUSB libusb-1.0)
        if (LIBUSB_FOUND)
          check_include_file(libusb.h HAVE_LIBUSB_H ${LIBUSB_CFLAGS})
          if (HAVE_LIBUSB_H)
            set(HAVE_HIDAPI TRUE)
          endif()
        endif()
      endif()
  
      if(HAVE_HIDAPI)
        set(SDL_JOYSTICK_HIDAPI 1)
        set(HAVE_SDL_JOYSTICK TRUE)
        file(GLOB HIDAPI_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/hidapi/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${HIDAPI_SOURCES})
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${LIBUSB_CFLAGS} \"-I${SDL2_SOURCE_DIR}/src/hidapi/hidapi\"")
        if(NOT HIDAPI_SKIP_LIBUSB)
          if(HIDAPI_ONLY_LIBUSB)
            set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/hidapi/libusb/hid.c)
            list(APPEND EXTRA_LIBS ${LIBUSB_LIBS})
          else()
            set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/hidapi/SDL_hidapi.c)
            # libusb is loaded dynamically, so don't add it to EXTRA_LIBS
            FindLibraryAndSONAME("usb-1.0")
            set(SDL_LIBUSB_DYNAMIC "\"${USB_LIB_SONAME}\"")
          endif()
        endif()
      endif()
    endif()
  endmacro()
  
  
  # Requires:
  # - n/a
  macro(CheckRPI)
    if(VIDEO_RPI)
      pkg_check_modules(VIDEO_RPI bcm_host brcmegl)
      if (NOT VIDEO_RPI_FOUND)
        set(VIDEO_RPI_INCLUDE_DIRS "/opt/vc/include" "/opt/vc/include/interface/vcos/pthreads" "/opt/vc/include/interface/vmcs_host/linux/" )
        set(VIDEO_RPI_LIBRARY_DIRS "/opt/vc/lib" )
        set(VIDEO_RPI_LIBRARIES bcm_host )
        set(VIDEO_RPI_LDFLAGS "-Wl,-rpath,/opt/vc/lib")
      endif()
      listtostr(VIDEO_RPI_INCLUDE_DIRS VIDEO_RPI_INCLUDE_FLAGS "-I")
      listtostr(VIDEO_RPI_LIBRARY_DIRS VIDEO_RPI_LIBRARY_FLAGS "-L")
  
      set(ORIG_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
      set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${VIDEO_RPI_INCLUDE_FLAGS} ${VIDEO_RPI_LIBRARY_FLAGS}")
      set(CMAKE_REQUIRED_LIBRARIES "${VIDEO_RPI_LIBRARIES}")
      check_c_source_compiles("
          #include <bcm_host.h>
          int main(int argc, char **argv) {}" HAVE_VIDEO_RPI)
      set(CMAKE_REQUIRED_FLAGS "${ORIG_CMAKE_REQUIRED_FLAGS}")
      set(CMAKE_REQUIRED_LIBRARIES)
  
      if(SDL_VIDEO AND HAVE_VIDEO_RPI)
        set(HAVE_SDL_VIDEO TRUE)
        set(SDL_VIDEO_DRIVER_RPI 1)
        file(GLOB VIDEO_RPI_SOURCES ${SDL2_SOURCE_DIR}/src/video/raspberry/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${VIDEO_RPI_SOURCES})
        list(APPEND EXTRA_LIBS ${VIDEO_RPI_LIBRARIES})
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${VIDEO_RPI_INCLUDE_FLAGS} ${VIDEO_RPI_LIBRARY_FLAGS}")
        list(APPEND EXTRA_LDFLAGS ${VIDEO_RPI_LDFLAGS})
      endif(SDL_VIDEO AND HAVE_VIDEO_RPI)
    endif(VIDEO_RPI)
  endmacro(CheckRPI)
  
  # Requires:
  # - EGL
  # - PkgCheckModules
  # Optional:
  # - KMSDRM_SHARED opt
  # - HAVE_DLOPEN opt
  macro(CheckKMSDRM)
    if(VIDEO_KMSDRM)
      pkg_check_modules(KMSDRM libdrm gbm egl)
      if(KMSDRM_FOUND AND HAVE_VIDEO_OPENGL_EGL)
        link_directories(
          ${KMSDRM_LIBRARY_DIRS}
        )
        include_directories(
          ${KMSDRM_INCLUDE_DIRS}
        )
        set(HAVE_VIDEO_KMSDRM TRUE)
        set(HAVE_SDL_VIDEO TRUE)
  
        file(GLOB KMSDRM_SOURCES ${SDL2_SOURCE_DIR}/src/video/kmsdrm/*.c)
        set(SOURCE_FILES ${SOURCE_FILES} ${KMSDRM_SOURCES})
  
        list(APPEND EXTRA_CFLAGS ${KMSDRM_CFLAGS})
  
        set(SDL_VIDEO_DRIVER_KMSDRM 1)
  
        if(KMSDRM_SHARED)
          if(NOT HAVE_DLOPEN)
            message_warn("You must have SDL_LoadObject() support for dynamic KMS/DRM loading")
          else()
            FindLibraryAndSONAME(drm)
            FindLibraryAndSONAME(gbm)
            set(SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC "\"${DRM_LIB_SONAME}\"")
            set(SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM "\"${GBM_LIB_SONAME}\"")
            set(HAVE_KMSDRM_SHARED TRUE)
          endif()
        else()
          set(EXTRA_LIBS ${KMSDRM_LIBRARIES} ${EXTRA_LIBS})
        endif()
      endif()
    endif()
  endmacro()
  

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