if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})

  message(FATAL_ERROR "Prevented in-tree built. Please create a build directory outside of the SDL source code and call cmake from there")

endif()

cmake_minimum_required(VERSION 2.6)

project(SDL2 C)

include(CheckFunctionExists)

include(CheckLibraryExists)

include(CheckIncludeFiles)

include(CheckIncludeFile)

include(CheckSymbolExists)

include(CheckCSourceRuns)

include(CheckCCompilerFlag)

include(CheckTypeSize)

include(CheckStructHasMember)

include(CMakeDependentOption)

include(FindPkgConfig)

set(CMAKE_MODULE_PATH "${SDL2_SOURCE_DIR}/cmake")

include(${SDL2_SOURCE_DIR}/cmake/macros.cmake)

include(${SDL2_SOURCE_DIR}/cmake/sdlchecks.cmake)

# General settings

# Edit include/SDL_version.h and change the version, then:

#   SDL_MICRO_VERSION += 1;

#   SDL_INTERFACE_AGE += 1;

#   SDL_BINARY_AGE += 1;

# if any functions have been added, set SDL_INTERFACE_AGE to 0.

# if backwards compatibility has been broken,

# set SDL_BINARY_AGE and SDL_INTERFACE_AGE to 0.

set(SDL_MAJOR_VERSION 2)

set(SDL_MINOR_VERSION 0)

set(SDL_MICRO_VERSION 3)

set(SDL_INTERFACE_AGE 1)

set(SDL_BINARY_AGE 3)

set(SDL_VERSION "${SDL_MAJOR_VERSION}.${SDL_MINOR_VERSION}.${SDL_MICRO_VERSION}")

# Calculate a libtool-like version number

math(EXPR LT_CURRENT "${SDL_MICRO_VERSION} - ${SDL_INTERFACE_AGE}")

math(EXPR LT_AGE "${SDL_BINARY_AGE} - ${SDL_INTERFACE_AGE}")

math(EXPR LT_MAJOR "${LT_CURRENT}- ${LT_AGE}")

set(LT_REVISION "${SDL_INTERFACE_AGE}")

set(LT_RELEASE "${SDL_MAJOR_VERSION}.${SDL_MINOR_VERSION}")

set(LT_VERSION "${LT_MAJOR}.${LT_AGE}.${LT_REVISION}")

message(STATUS "${LT_VERSION} :: ${LT_AGE} :: ${LT_REVISION} :: ${LT_CURRENT} :: ${LT_RELEASE}")

# General settings & flags

set(LIBRARY_OUTPUT_DIRECTORY "build")

# Check for 64 or 32 bit

set(SIZEOF_VOIDP ${CMAKE_SIZEOF_VOID_P})

if(CMAKE_SIZEOF_VOID_P EQUAL 8)

  set(ARCH_64 TRUE)

  set(PROCESSOR_ARCH "x64")

else()

  set(ARCH_64 FALSE)

  set(PROCESSOR_ARCH "x86")

endif()

set(LIBNAME SDL2)

if(NOT LIBTYPE)

  set(LIBTYPE SHARED)

endif()

# Get the platform

if(WIN32)

  if(NOT WINDOWS)

    set(WINDOWS TRUE)

  endif()

elseif(UNIX AND NOT APPLE)

  if(CMAKE_SYSTEM_NAME MATCHES ".*Linux")

    set(LINUX TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "kFreeBSD.*")

    set(FREEBSD TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "kNetBSD.*|NetBSD.*")

    set(NETBSD TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "kOpenBSD.*|OpenBSD.*")

    set(OPENBSD TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES ".*GNU.*")

    set(GNU TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES ".*BSDI.*")

    set(BSDI TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "DragonFly.*|FreeBSD")

    set(FREEBSD TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "SYSV5.*")

    set(SYSV5 TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "Solaris.*")

    set(SOLARIS TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "HP-UX.*")

    set(HPUX TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "AIX.*")

    set(AIX TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES "Minix.*")

    set(MINIX TRUE)

  endif()

elseif(APPLE)

  if(CMAKE_SYSTEM_NAME MATCHES ".*Darwin.*")

    set(DARWIN TRUE)

  elseif(CMAKE_SYSTEM_NAME MATCHES ".*MacOS.*")

    set(MACOSX TRUE)

  endif()

  # TODO: iOS?

elseif(CMAKE_SYSTEM_NAME MATCHES "BeOS.*")

  message_error("BeOS support has been removed as of SDL 2.0.2.")

elseif(CMAKE_SYSTEM_NAME MATCHES "Haiku.*")

  set(HAIKU TRUE)

endif()

# Don't mistake osx for unix

if(UNIX AND NOT APPLE)

  set(UNIX_SYS ON)

else()

  set(UNIX_SYS OFF)

endif()

if(UNIX OR APPLE)

  set(UNIX_OR_MAC_SYS ON)

else()

  set(UNIX_OR_MAC_SYS OFF)

endif()

# Default option knobs

if(APPLE OR ARCH_64)

  set(OPT_DEF_SSEMATH ON)

endif()

if(UNIX OR MINGW OR MSYS)

  set(OPT_DEF_LIBC ON)

endif()

# Compiler info

if(CMAKE_COMPILER_IS_GNUCC)

  set(USE_GCC TRUE)

  set(OPT_DEF_ASM TRUE)

elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")

  set(USE_CLANG TRUE)

  set(OPT_DEF_ASM TRUE)

elseif(MSVC_VERSION GREATER 1400) # VisualStudio 8.0+

  set(OPT_DEF_ASM TRUE)

  #set(CMAKE_C_FLAGS "/ZI /WX- /

else()

  set(OPT_DEF_ASM FALSE)

endif()

# Default flags, if not set otherwise

if("$ENV{CFLAGS}" STREQUAL "")

  if(USE_GCC OR USE_CLANG)

    set(CMAKE_C_FLAGS "-g -O3")

  endif()

else("$ENV{CFLAGS}" STREQUAL "")

  set(CMAKE_C_FLAGS "$ENV{CFLAGS}")

  list(APPEND EXTRA_CFLAGS "$ENV{CFLAGS}")

endif()

if(NOT ("$ENV{CFLAGS}" STREQUAL "")) # Hackish, but does the trick on Win32

  list(APPEND EXTRA_LDFLAGS "$ENV{LDFLAGS}")

endif()

if(MSVC)

  option(FORCE_STATIC_VCRT "Force /MT for static VC runtimes" OFF)

  if(FORCE_STATIC_VCRT)

    foreach(flag_var

        CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE

        CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO)

      if(${flag_var} MATCHES "/MD")

        string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")

      endif()

    endforeach(flag_var)

  endif()

endif()

# Those are used for pkg-config and friends, so that the SDL2.pc, sdl2-config,

# etc. are created correctly.

set(SDL_LIBS "-lSDL2")

set(SDL_CFLAGS "")

if(CYGWIN)

  # We build SDL on cygwin without the UNIX emulation layer

  include_directories("-I/usr/include/mingw")

  set(CMAKE_REQUIRED_FLAGS "-mno-cygwin")

  check_c_source_compiles("int main(int argc, char **argv) {}"

    HAVE_GCC_NO_CYGWIN)

  set(CMAKE_REQUIRED_FLAGS)

  if(HAVE_GCC_NO_CYGWIN)

    list(APPEND EXTRA_LDFLAGS "-mno-cygwin")

    list(APPEND SDL_LIBS "-mno-cygwin")

  endif()

  set(SDL_CFLAGS "${SDL_CFLAGS} -I/usr/include/mingw")

endif()

add_definitions(-DUSING_GENERATED_CONFIG_H)

# General includes

include_directories(${SDL2_BINARY_DIR}/include ${SDL2_SOURCE_DIR}/include)

set(SDL_SUBSYSTEMS

    Atomic Audio Video Render Events Joystick Haptic Power Threads Timers

    File Loadso CPUinfo Filesystem)

foreach(_SUB ${SDL_SUBSYSTEMS})

  string(TOUPPER ${_SUB} _OPT)

  option(SDL_${_OPT} "Enable the ${_SUB} subsystem" ON)

endforeach()

option_string(ASSERTIONS "Enable internal sanity checks (auto/disabled/release/enabled/paranoid)" "auto")

#set_option(DEPENDENCY_TRACKING "Use gcc -MMD -MT dependency tracking" ON)

set_option(LIBC                "Use the system C library" ${OPT_DEF_LIBC})

set_option(GCC_ATOMICS         "Use gcc builtin atomics" ${USE_GCC})

set_option(ASSEMBLY            "Enable assembly routines" ${OPT_DEF_ASM})

set_option(SSEMATH             "Allow GCC to use SSE floating point math" ${OPT_DEF_SSEMATH})

set_option(MMX                 "Use MMX assembly routines" ${OPT_DEF_ASM})

set_option(3DNOW               "Use 3Dnow! MMX assembly routines" ${OPT_DEF_ASM})

set_option(SSE                 "Use SSE assembly routines" ${OPT_DEF_ASM})

set_option(SSE2                "Use SSE2 assembly routines" ${OPT_DEF_SSEMATH})

set_option(ALTIVEC             "Use Altivec assembly routines" ${OPT_DEF_ASM})

set_option(DISKAUDIO           "Support the disk writer audio driver" ON)

set_option(DUMMYAUDIO          "Support the dummy audio driver" ON)

set_option(VIDEO_DIRECTFB      "Use DirectFB video driver" OFF)

dep_option(DIRECTFB_SHARED     "Dynamically load directfb support" ON "VIDEO_DIRECTFB" OFF)

set_option(FUSIONSOUND         "Use FusionSound audio driver" OFF)

dep_option(FUSIONSOUND_SHARED  "Dynamically load fusionsound audio support" ON "FUSIONSOUND_SHARED" OFF)

set_option(VIDEO_DUMMY         "Use dummy video driver" ON)

set_option(VIDEO_OPENGL        "Include OpenGL support" ON)

set_option(VIDEO_OPENGLES      "Include OpenGL ES support" ON)

set_option(PTHREADS            "Use POSIX threads for multi-threading" ${UNIX_OR_MAC_SYS})

dep_option(PTHREADS_SEM        "Use pthread semaphores" ON "PTHREADS" OFF)

set_option(SDL_DLOPEN          "Use dlopen for shared object loading" ON)

set_option(OSS                 "Support the OSS audio API" ${UNIX_SYS})

set_option(ALSA                "Support the ALSA audio API" ${UNIX_SYS})

dep_option(ALSA_SHARED         "Dynamically load ALSA audio support" ON "ALSA" OFF)

set_option(ESD                 "Support the Enlightened Sound Daemon" ${UNIX_SYS})

dep_option(ESD_SHARED          "Dynamically load ESD audio support" ON "ESD" OFF)

set_option(PULSEAUDIO          "Use PulseAudio" ${UNIX_SYS})

dep_option(PULSEAUDIO_SHARED   "Dynamically load PulseAudio support" ON "PULSEAUDIO" OFF)

set_option(ARTS                "Support the Analog Real Time Synthesizer" ${UNIX_SYS})

dep_option(ARTS_SHARED         "Dynamically load aRts audio support" ON "ARTS" OFF)

set_option(NAS                 "Support the NAS audio API" ${UNIX_SYS})

set_option(NAS_SHARED          "Dynamically load NAS audio API" ${UNIX_SYS})

set_option(SNDIO               "Support the sndio audio API" ${UNIX_SYS})

set_option(RPATH               "Use an rpath when linking SDL" ${UNIX_SYS})

set_option(CLOCK_GETTIME       "Use clock_gettime() instead of gettimeofday()" OFF)

set_option(INPUT_TSLIB         "Use the Touchscreen library for input" ${UNIX_SYS})

set_option(VIDEO_X11           "Use X11 video driver" ${UNIX_SYS})

set_option(VIDEO_WAYLAND       "Use Wayland video driver" OFF) #${UNIX_SYS})

set_option(VIDEO_MIR           "Use Mir video driver" OFF) #${UNIX_SYS})

dep_option(X11_SHARED          "Dynamically load X11 support" ON "VIDEO_X11" OFF)

set(SDL_X11_OPTIONS Xcursor Xinerama XInput Xrandr Xscrnsaver XShape Xvm)

foreach(_SUB ${SDL_X11_OPTIONS})

  string(TOUPPER "VIDEO_X11_${_SUB}" _OPT)

  dep_option(${_OPT}           "Enable ${_SUB} support" ON "VIDEO_X11" OFF)

endforeach()

set_option(VIDEO_COCOA         "Use Cocoa video driver" ${APPLE})

set_option(DIRECTX             "Use DirectX for Windows audio/video" ${WINDOWS})

set_option(RENDER_D3D          "Enable the Direct3D render driver" ${WINDOWS})

# TODO: We should (should we?) respect cmake's ${BUILD_SHARED_LIBS} flag here

# The options below are for compatibility to configure's default behaviour.

set(SDL_SHARED ON CACHE BOOL "Build a shared version of the library")

set(SDL_STATIC ON CACHE BOOL "Build a static version of the library")

# General source files

file(GLOB SOURCE_FILES

  ${SDL2_SOURCE_DIR}/src/*.c

  ${SDL2_SOURCE_DIR}/src/atomic/*.c

  ${SDL2_SOURCE_DIR}/src/audio/*.c

  ${SDL2_SOURCE_DIR}/src/cpuinfo/*.c

  ${SDL2_SOURCE_DIR}/src/dynapi/*.c

  ${SDL2_SOURCE_DIR}/src/events/*.c

  ${SDL2_SOURCE_DIR}/src/file/*.c

  ${SDL2_SOURCE_DIR}/src/libm/*.c

  ${SDL2_SOURCE_DIR}/src/render/*.c

  ${SDL2_SOURCE_DIR}/src/render/*/*.c

  ${SDL2_SOURCE_DIR}/src/stdlib/*.c

  ${SDL2_SOURCE_DIR}/src/thread/*.c

  ${SDL2_SOURCE_DIR}/src/timer/*.c

  ${SDL2_SOURCE_DIR}/src/video/*.c)

if(ASSERTIONS STREQUAL "auto")

  # Do nada - use optimization settings to determine the assertion level

elseif(ASSERTIONS STREQUAL "disabled")

  set(SDL_DEFAULT_ASSERT_LEVEL 0)

elseif(ASSERTIONS STREQUAL "release")

  set(SDL_DEFAULT_ASSERT_LEVEL 1)

elseif(ASSERTIONS STREQUAL "enabled")

  set(SDL_DEFAULT_ASSERT_LEVEL 2)

elseif(ASSERTIONS STREQUAL "paranoid")

  set(SDL_DEFAULT_ASSERT_LEVEL 3)

else()

  message_error("unknown assertion level")

endif()

set(HAVE_ASSERTIONS ${ASSERTIONS})

# Compiler option evaluation

if(USE_GCC OR USE_CLANG)

  if(DEPENDENCY_TRACKING)

    check_c_source_compiles("

        #if !defined(__GNUC__) || __GNUC__ < 3

        #error Dependency tracking requires GCC 3.0 or newer

        #endif

        int main(int argc, char **argv) { }" HAVE_DEPENDENCY_TRACKING)

  endif()

  if(GCC_ATOMICS)

    check_c_source_compiles("int main(int argc, char **argv) {

        int a;

        void *x, *y, *z;

        __sync_lock_test_and_set(&a, 4);

        __sync_lock_test_and_set(&x, y);

        __sync_fetch_and_add(&a, 1);

        __sync_bool_compare_and_swap(&a, 5, 10);

        __sync_bool_compare_and_swap(&x, y, z); }" HAVE_GCC_ATOMICS)

    if(NOT HAVE_GCC_ATOMICS)

      check_c_source_compiles("int main(int argc, char **argv) {

          int a;

          __sync_lock_test_and_set(&a, 1);

          __sync_lock_release(&a); }" HAVE_GCC_SYNC_LOCK_TEST_AND_SET)

    endif()

  endif()

  set(CMAKE_REQUIRED_FLAGS "-mpreferred-stack-boundary=2")

  check_c_source_compiles("int x = 0; int main(int argc, char **argv) {}"

    HAVE_GCC_PREFERRED_STACK_BOUNDARY)

  set(CMAKE_REQUIRED_FLAGS)

  set(CMAKE_REQUIRED_FLAGS "-fvisibility=hidden -Werror")

  check_c_source_compiles("

      #if !defined(__GNUC__) || __GNUC__ < 4

      #error SDL only uses visibility attributes in GCC 4 or newer

      #endif

      int main(int argc, char **argv) {}" HAVE_GCC_FVISIBILITY)

  if(HAVE_GCC_FVISIBILITY)

    list(APPEND EXTRA_CFLAGS "-fvisibility=hidden")

  endif()

  set(CMAKE_REQUIRED_FLAGS)

  check_c_compiler_flag(-Wall HAVE_GCC_WALL)

  if(HAVE_GCC_WALL)

    if(HAIKU)

      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-multichar")

    endif()

  endif()

endif()

if(ASSEMBLY)

  if(USE_GCC OR USE_CLANG)

    set(SDL_ASSEMBLY_ROUTINES 1)

    # TODO: Those all seem to be quite GCC specific - needs to be

    # reworked for better compiler support

    set(HAVE_ASSEMBLY TRUE)

    if(MMX)

      set(CMAKE_REQUIRED_FLAGS "-mmmx")

      check_c_source_compiles("

          #ifdef __MINGW32__

          #include <_mingw.h>

          #ifdef __MINGW64_VERSION_MAJOR

          #include <intrin.h>

          #else

          #include <mmintrin.h>

          #endif

          #else

          #include <mmintrin.h>

          #endif

          #ifndef __MMX__

          #error Assembler CPP flag not enabled

          #endif

          int main(int argc, char **argv) { }" HAVE_MMX)

      if(HAVE_MMX)

        list(APPEND EXTRA_CFLAGS "-mmmx")

      endif()

      set(CMAKE_REQUIRED_FLAGS)

    endif()

    if(3DNOW)

      set(CMAKE_REQUIRED_FLAGS "-m3dnow")

      check_c_source_compiles("

          #include <mm3dnow.h>

          #ifndef __3dNOW__

          #error Assembler CPP flag not enabled

          #endif

          int main(int argc, char **argv) {

            void *p = 0;

            _m_prefetch(p);

          }" HAVE_3DNOW)

      if(HAVE_3DNOW)

        list(APPEND EXTRA_CFLAGS "-m3dnow")

      endif()

      set(CMAKE_REQUIRED_FLAGS)

    endif()

    if(SSE)

      set(CMAKE_REQUIRED_FLAGS "-msse")

      check_c_source_compiles("

          #ifdef __MINGW32__

          #include <_mingw.h>

          #ifdef __MINGW64_VERSION_MAJOR

          #include <intrin.h>

          #else

          #include <xmmintrin.h>

          #endif

          #else

          #include <xmmintrin.h>

          #endif

          #ifndef __SSE__

          #error Assembler CPP flag not enabled

          #endif

          int main(int argc, char **argv) { }" HAVE_SSE)

      if(HAVE_SSE)

        list(APPEND EXTRA_CFLAGS "-msse")

      endif()

      set(CMAKE_REQUIRED_FLAGS)

    endif()

    if(SSE2)

      set(CMAKE_REQUIRED_FLAGS "-msse2")

      check_c_source_compiles("

          #ifdef __MINGW32__

          #include <_mingw.h>

          #ifdef __MINGW64_VERSION_MAJOR

          #include <intrin.h>

          #else

          #include <emmintrin.h>

          #endif

          #else

          #include <emmintrin.h>

          #endif

          #ifndef __SSE2__

          #error Assembler CPP flag not enabled

          #endif

          int main(int argc, char **argv) { }" HAVE_SSE2)

      if(HAVE_SSE2)

        list(APPEND EXTRA_CFLAGS "-msse2")

      endif()

      set(CMAKE_REQUIRED_FLAGS)

    endif()

    if(SSEMATH)

      if(SSE OR SSE2)

        if(USE_GCC)

          list(APPEND EXTRA_CFLAGS "-mfpmath=387")

        endif()

        set(HAVE_SSEMATH TRUE)

      endif()

    endif()

    if(ALTIVEC)

      set(CMAKE_REQUIRED_FLAGS "-maltivec")

      check_c_source_compiles("

          #include <altivec.h>

          vector unsigned int vzero() {

              return vec_splat_u32(0);

          }

          int main(int argc, char **argv) { }" HAVE_ALTIVEC_H_HDR)

      check_c_source_compiles("

          vector unsigned int vzero() {

              return vec_splat_u32(0);

          }

          int main(int argc, char **argv) { }" HAVE_ALTIVEC)

      set(CMAKE_REQUIRED_FLAGS)

      if(HAVE_ALTIVEC OR HAVE_ALTIVEC_H_HDR)

        set(HAVE_ALTIVEC TRUE) # if only HAVE_ALTIVEC_H_HDR is set

        list(APPEND EXTRA_CFLAGS "-maltivec")

        set(SDL_ALTIVEC_BLITTERS 1)

        if(HAVE_ALTIVEC_H_HDR)

          set(HAVE_ALTIVEC_H 1)

        endif()

      endif()

    endif()

  elseif(MSVC_VERSION GREATER 1500)

    # TODO: SDL_cpuinfo.h needs to support the user's configuration wish

    # for MSVC - right now it is always activated

    if(NOT ARCH_64)

      set(HAVE_MMX TRUE)

      set(HAVE_3DNOW TRUE)

    endif()

    set(HAVE_SSE TRUE)

    set(HAVE_SSE2 TRUE)

    set(SDL_ASSEMBLY_ROUTINES 1)

  endif()

# TODO:

#else(ASSEMBLY)

#  if(USE_GCC OR USE_CLANG)

#    list(APPEND EXTRA_CFLAGS "-mno-sse" "-mno-sse2" "-mno-mmx")

#  endif()

endif()

# TODO: Can't deactivate on FreeBSD? w/o LIBC, SDL_stdinc.h can't define

# anything.

if(LIBC)

  if(WINDOWS AND NOT MINGW)

    set(HAVE_LIBC TRUE)

    foreach(_HEADER stdio.h string.h ctype.h math.h)

      string(TOUPPER "HAVE_${_HEADER}" _UPPER)

      string(REPLACE "." "_" _HAVE_H ${_UPPER})

      set(${_HAVE_H} 1)

    endforeach()

    set(HAVE_SIGNAL_H 1)

    foreach(_FN

            malloc calloc realloc free qsort abs memset memcpy memmove memcmp

            strlen _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa

            _ultoa strtol strtoul strtoll strtod atoi atof strcmp strncmp

            _stricmp _strnicmp sscanf atan atan2 acos asin ceil copysign cos

            cosf fabs floor log pow scalbn sin sinf sqrt)

      string(TOUPPER ${_FN} _UPPER)

      set(HAVE_${_UPPER} 1)

    endforeach()

    if(NOT CYGWIN AND NOT MINGW)

      set(HAVE_ALLOCA 1)

    endif()

    set(HAVE_M_PI 1)

    add_definitions(-D_USE_MATH_DEFINES) # needed for M_PI

    set(STDC_HEADERS 1)

  else(WINDOWS AND NOT MINGW)

    set(HAVE_LIBC TRUE)

    check_include_file(sys/types.h HAVE_SYS_TYPES_H)

    foreach(_HEADER

            stdio.h stdlib.h stddef.h stdarg.h malloc.h memory.h string.h

            strings.h inttypes.h stdint.h ctype.h math.h iconv.h signal.h)

      string(TOUPPER "HAVE_${_HEADER}" _UPPER)

      string(REPLACE "." "_" _HAVE_H ${_UPPER})

      check_include_file("${_HEADER}" ${_HAVE_H})

    endforeach()

    check_include_files("dlfcn.h;stdint.h;stddef.h;inttypes.h;stdlib.h;strings.h;string.h;float.h" STDC_HEADERS)

    check_type_size("size_t" SIZEOF_SIZE_T)

    check_symbol_exists(M_PI math.h HAVE_M_PI)

    # TODO: refine the mprotect check

    check_c_source_compiles("#include <sys/types.h>

                             #include <sys/mman.h>

                             int main() { }" HAVE_MPROTECT)

    foreach(_FN

            strtod malloc calloc realloc free getenv setenv putenv unsetenv

            qsort abs bcopy memset memcpy memmove memcmp strlen strlcpy strlcat

            strdup _strrev _strupr _strlwr strchr strrchr strstr itoa _ltoa

            _uitoa _ultoa strtol strtoul _i64toa _ui64toa strtoll strtoull

            atoi atof strcmp strncmp _stricmp strcasecmp _strnicmp strncasecmp

            vsscanf vsnprintf fseeko fseeko64 sigaction setjmp

            nanosleep sysconf sysctlbyname

            )

      string(TOUPPER ${_FN} _UPPER)

      set(_HAVEVAR "HAVE_${_UPPER}")

      check_function_exists("${_FN}" ${_HAVEVAR})

    endforeach()

    check_library_exists(m pow "" HAVE_LIBM)

    if(HAVE_LIBM)

      set(CMAKE_REQUIRED_LIBRARIES m)

      foreach(_FN

              atan atan2 ceil copysign cos cosf fabs floor log pow scalbn sin

              sinf sqrt)

        string(TOUPPER ${_FN} _UPPER)

        set(_HAVEVAR "HAVE_${_UPPER}")

        check_function_exists("${_FN}" ${_HAVEVAR})

      endforeach()

      set(CMAKE_REQUIRED_LIBRARIES)

      list(APPEND EXTRA_LIBS m)

    endif()

    check_library_exists(iconv iconv_open "" HAVE_LIBICONV)

    if(HAVE_LIBICONV)

      list(APPEND EXTRA_LIBS iconv)

    endif()

    check_struct_has_member("struct sigaction" "sa_sigaction" "signal.h" HAVE_SA_SIGACTION)

  endif()

else(LIBC)

  if(WINDOWS)

    set(HAVE_STDARG_H 1)

    set(HAVE_STDDEF_H 1)

  endif()

endif()

# Enable/disable various subsystems of the SDL library

foreach(_SUB ${SDL_SUBSYSTEMS})

  string(TOUPPER ${_SUB} _OPT)

  if(NOT SDL_${_OPT})

    set(SDL_${_OPT}_DISABLED 1)

  endif()

endforeach()

if(SDL_JOYSTICK)

  file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/*.c)

  set(SOURCE_FILES ${SOURCE_FILES} ${JOYSTICK_SOURCES})

endif()

if(SDL_HAPTIC)

  if(NOT SDL_JOYSTICK)

    # Haptic requires some private functions from the joystick subsystem.

    message_error("SDL_HAPTIC requires SDL_JOYSTICK, which is not enabled")

  endif()

  file(GLOB HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/*.c)

  set(SOURCE_FILES ${SOURCE_FILES} ${HAPTIC_SOURCES})

endif()

if(SDL_POWER)

  file(GLOB POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/*.c)

  set(SOURCE_FILES ${SOURCE_FILES} ${POWER_SOURCES})

endif()

# TODO: in configure.in, the test for LOADSO and SDL_DLOPEN is a bit weird:

# if LOADSO is not wanted, SDL_LOADSO_DISABLED is set

# If however on Unix or APPLE dlopen() is detected via CheckDLOPEN(),

# SDL_LOADSO_DISABLED will not be set, regardless of the LOADSO settings

# General SDL subsystem options, valid for all platforms

if(SDL_AUDIO)

  # CheckDummyAudio/CheckDiskAudio - valid for all platforms

  if(DUMMYAUDIO)

    set(SDL_AUDIO_DRIVER_DUMMY 1)

    file(GLOB DUMMYAUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/dummy/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${DUMMYAUDIO_SOURCES})

    set(HAVE_DUMMYAUDIO TRUE)

  endif()

  if(DISKAUDIO)

    set(SDL_AUDIO_DRIVER_DISK 1)

    file(GLOB DISKAUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/disk/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${DISKAUDIO_SOURCES})

    set(HAVE_DISKAUDIO TRUE)

  endif()

endif()

if(SDL_DLOPEN)

  # Relevant for Unix/Darwin only

  if(UNIX OR APPLE)

    CheckDLOPEN()

  endif()

endif()

if(SDL_VIDEO)

  if(VIDEO_DUMMY)

    set(SDL_VIDEO_DRIVER_DUMMY 1)

    file(GLOB VIDEO_DUMMY_SOURCES ${SDL2_SOURCE_DIR}/src/video/dummy/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${VIDEO_DUMMY_SOURCES})

    set(HAVE_VIDEO_DUMMY TRUE)

    set(HAVE_SDL_VIDEO TRUE)

  endif()

endif()

# Platform-specific options and settings

if(UNIX AND NOT APPLE)

  if(SDL_AUDIO)

    if(SYSV5 OR SOLARIS OR HPUX)

        set(SDL_AUDIO_DRIVER_SUNAUDIO 1)

        file(GLOB SUN_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/sun/*.c)

        set(SOURCE_FILES ${SOURCE_FILES} ${SUN_AUDIO_SOURCES})

        set(HAVE_SDL_AUDIO TRUE)

    elseif(NETBSD OR OPENBSD)

        set(SDL_AUDIO_DRIVER_BSD 1)

        file(GLOB BSD_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/bsd/*.c)

        set(SOURCE_FILES ${SOURCE_FILES} ${BSD_AUDIO_SOURCES})

        set(HAVE_SDL_AUDIO TRUE)

    elseif(AIX)

        set(SDL_AUDIO_DRIVER_PAUDIO 1)

        file(GLOB AIX_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/paudio/*.c)

        set(SOURCE_FILES ${SOURCE_FILES} ${AIX_AUDIO_SOURCES})

        set(HAVE_SDL_AUDIO TRUE)

    endif()

    CheckOSS()

    CheckALSA()

    CheckPulseAudio()

    CheckESD()

    CheckARTS()

    CheckNAS()

    CheckSNDIO()

    CheckFusionSound()

  endif()

  if(SDL_VIDEO)

    CheckX11()

    CheckMir()

    CheckDirectFB()

    CheckOpenGLX11()

    CheckOpenGLESX11()

    CheckWayland()

  endif()

  if(LINUX)

    check_c_source_compiles("

        #include <linux/input.h>

        #ifndef EVIOCGNAME

        #error EVIOCGNAME() ioctl not available

        #endif

        int main(int argc, char** argv) {}" HAVE_INPUT_EVENTS)

    check_c_source_compiles("

        #include <linux/kd.h>

        #include <linux/keyboard.h>

        int main(int argc, char **argv) 

        {

            struct kbentry kbe;

            kbe.kb_table = KG_CTRL;

            ioctl(0, KDGKBENT, &kbe);

        }" HAVE_INPUT_KD)

    file(GLOB CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/linux/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${CORE_SOURCES})

    if(HAVE_INPUT_EVENTS)

      set(SDL_INPUT_LINUXEV 1)

    endif()

    if(SDL_HAPTIC AND HAVE_INPUT_EVENTS)

      set(SDL_HAPTIC_LINUX 1)

      file(GLOB HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/linux/*.c)

      set(SOURCE_FILES ${SOURCE_FILES} ${HAPTIC_SOURCES})

      set(HAVE_SDL_HAPTIC TRUE)

    endif()

    if(HAVE_INPUT_KD)

      set(SDL_INPUT_LINUXKD 1)

    endif()

    check_include_file("libudev.h" HAVE_LIBUDEV_H)

    # !!! FIXME: this needs pkg-config to find the include path, I think.

    check_include_file("dbus/dbus.h" HAVE_DBUS_DBUS_H)

  endif()

  if(INPUT_TSLIB)

    check_c_source_compiles("

        #include \"tslib.h\"

        int main(int argc, char** argv) { }" HAVE_INPUT_TSLIB)

    if(HAVE_INPUT_TSLIB)

      set(SDL_INPUT_TSLIB 1)

      list(APPEND EXTRA_LIBS ts)

    endif()

  endif()

  if(SDL_JOYSTICK)

    CheckUSBHID()   # seems to be BSD specific - limit the test to BSD only?

    if(LINUX)

      set(SDL_JOYSTICK_LINUX 1)

      file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/linux/*.c)

      set(SOURCE_FILES ${SOURCE_FILES} ${JOYSTICK_SOURCES})

      set(HAVE_SDL_JOYSTICK TRUE)

    endif()

  endif()

  CheckPTHREAD()

  if(CLOCK_GETTIME)

    check_library_exists(rt clock_gettime "" FOUND_CLOCK_GETTIME)

    if(FOUND_CLOCK_GETTIME)

      list(APPEND EXTRA_LIBS rt)

      set(HAVE_CLOCK_GETTIME 1)

    else(FOUND_CLOCK_GETTIME)

      check_library_exists(c clock_gettime "" FOUND_CLOCK_GETTIME)

      if(FOUND_CLOCK_GETTIME)

        set(HAVE_CLOCK_GETTIME 1)

      endif()

    endif()

  endif()

  check_include_file(linux/version.h HAVE_LINUX_VERSION_H)

  if(HAVE_LINUX_VERSION_H)

    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHAVE_LINUX_VERSION_H")

  endif()

  if(SDL_POWER)

    if(LINUX)

      set(SDL_POWER_LINUX 1)

      file(GLOB POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/linux/*.c)

      set(SOURCE_FILES ${SOURCE_FILES} ${POWER_SOURCES})

      set(HAVE_SDL_POWER TRUE)

    endif()

  endif()

  if(SDL_FILESYSTEM)

    set(SDL_FILESYSTEM_UNIX 1)

    file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/unix/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${FILESYSTEM_SOURCES})

    set(HAVE_SDL_FILESYSTEM TRUE)

  endif()

  if(SDL_TIMERS)

    set(SDL_TIMER_UNIX 1)

    file(GLOB TIMER_SOURCES ${SDL2_SOURCE_DIR}/src/timer/unix/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${TIMER_SOURCES})

    set(HAVE_SDL_TIMERS TRUE)

  endif()

  if(RPATH)

    set(SDL_RLD_FLAGS "")

    if(BSDI OR FREEBSD OR LINUX OR NETBSD)

      set(SDL_RLD_FLAGS "-Wl,-rpath,\${libdir}")

    elseif(SOLARIS)

      set(SDL_RLD_FLAGS "-R\${libdir}")

    endif()

    set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)

    set(HAVE_RPATH TRUE)

  endif()

elseif(WINDOWS)

  find_program(WINDRES windres)

  check_c_source_compiles("

    #include <windows.h>

    int main(int argc, char **argv) { }" HAVE_WIN32_CC)

  file(GLOB CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/windows/*.c)

  set(SOURCE_FILES ${SOURCE_FILES} ${CORE_SOURCES})

  # Check for DirectX

  if(DIRECTX)

    if("$ENV{DXSDK_DIR}" STREQUAL "")

      message_error("DIRECTX requires the \$DXSDK_DIR environment variable to be set")

    endif()

    set(CMAKE_REQUIRED_FLAGS "/I\"$ENV{DXSDK_DIR}\\Include\"")

    check_include_file(d3d9.h HAVE_D3D_H)

    check_include_file(d3d11_1.h HAVE_D3D11_H)

    check_include_file(ddraw.h HAVE_DDRAW_H)

    check_include_file(dsound.h HAVE_DSOUND_H)

    check_include_file(dinput.h HAVE_DINPUT_H)

    check_include_file(xaudio2.h HAVE_XAUDIO2_H)

    if(HAVE_D3D_H OR HAVE_D3D11_H OR HAVE_DDRAW_H OR HAVE_DSOUND_H OR HAVE_DINPUT_H OR HAVE_XAUDIO2_H)

      set(HAVE_DIRECTX TRUE)

      # TODO: change $ENV{DXSDL_DIR} to get the path from the include checks

      link_directories($ENV{DXSDK_DIR}\\lib\\${PROCESSOR_ARCH})

      include_directories($ENV{DXSDK_DIR}\\Include)

    endif()

    set(CMAKE_REQUIRED_FLAGS)

  endif()

  if(SDL_AUDIO)

    set(SDL_AUDIO_DRIVER_WINMM 1)

    file(GLOB WINMM_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/winmm/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${WINMM_AUDIO_SOURCES})

    set(HAVE_SDL_AUDIO TRUE)

    if(HAVE_DSOUND_H)

      set(SDL_AUDIO_DRIVER_DSOUND 1)

      file(GLOB DSOUND_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/directsound/*.c)

      set(SOURCE_FILES ${SOURCE_FILES} ${DSOUND_AUDIO_SOURCES})

    endif()

    if(HAVE_XAUDIO2_H)

      set(SDL_AUDIO_DRIVER_XAUDIO2 1)

      file(GLOB XAUDIO2_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/xaudio2/*.c)

      set(SOURCE_FILES ${SOURCE_FILES} ${XAUDIO2_AUDIO_SOURCES})

    endif()

  endif()

  if(SDL_VIDEO)

    # requires SDL_LOADSO on Windows (IME, DX, etc.)

    if(NOT SDL_LOADSO)

      message_error("SDL_VIDEO requires SDL_LOADSO, which is not enabled")

    endif()

    set(SDL_VIDEO_DRIVER_WINDOWS 1)

    file(GLOB WIN_VIDEO_SOURCES ${SDL2_SOURCE_DIR}/src/video/windows/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${WIN_VIDEO_SOURCES})

    if(RENDER_D3D AND HAVE_D3D_H)

      set(SDL_VIDEO_RENDER_D3D 1)

      set(HAVE_RENDER_D3D TRUE)

    endif()

    if(RENDER_D3D AND HAVE_D3D11_H)

      set(SDL_VIDEO_RENDER_D3D11 1)

      set(HAVE_RENDER_D3D TRUE)

    endif()

    set(HAVE_SDL_VIDEO TRUE)

  endif()

  if(SDL_THREADS)

    set(SDL_THREAD_WINDOWS 1)

    set(SOURCE_FILES ${SOURCE_FILES}

      ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_sysmutex.c

      ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_syssem.c

      ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_systhread.c

      ${SDL2_SOURCE_DIR}/src/thread/windows/SDL_systls.c

      ${SDL2_SOURCE_DIR}/src/thread/generic/SDL_syscond.c)

    set(HAVE_SDL_THREADS TRUE)

  endif()

  if(SDL_POWER)

    set(SDL_POWER_WINDOWS 1)

    set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/power/windows/SDL_syspower.c)

    set(HAVE_SDL_POWER TRUE)

  endif()

  if(SDL_FILESYSTEM)

    set(SDL_FILESYSTEM_WINDOWS 1)

    file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/windows/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${FILESYSTEM_SOURCES})

    set(HAVE_SDL_FILESYSTEM TRUE)

  endif()

  # Libraries for Win32 native and MinGW

  list(APPEND EXTRA_LIBS user32 gdi32 winmm imm32 ole32 oleaut32 version uuid)

  # TODO: in configure.in the check for timers is set on

  # cygwin | mingw32* - does this include mingw32CE?

  if(SDL_TIMERS)

    set(SDL_TIMER_WINDOWS 1)

    file(GLOB TIMER_SOURCES ${SDL2_SOURCE_DIR}/src/timer/windows/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${TIMER_SOURCES})

    set(HAVE_SDL_TIMERS TRUE)

  endif()

  if(SDL_LOADSO)

    set(SDL_LOADSO_WINDOWS 1)

    file(GLOB LOADSO_SOURCES ${SDL2_SOURCE_DIR}/src/loadso/windows/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${LOADSO_SOURCES})

    set(HAVE_SDL_LOADSO TRUE)

  endif()

  file(GLOB CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/windows/*.c)

  set(SOURCE_FILES ${SOURCE_FILES} ${CORE_SOURCES})

  if(SDL_VIDEO)

    if(VIDEO_OPENGL)

      set(SDL_VIDEO_OPENGL 1)

      set(SDL_VIDEO_OPENGL_WGL 1)

      set(SDL_VIDEO_RENDER_OGL 1)

      set(HAVE_VIDEO_OPENGL TRUE)

    endif()

  endif()

  if(SDL_JOYSTICK)

    if(HAVE_DINPUT_H)

      set(SDL_JOYSTICK_DINPUT 1)

      set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/joystick/windows/SDL_dxjoystick.c)

      list(APPEND EXTRA_LIBS dinput8 dxguid dxerr)

    else()

      set(SDL_JOYSTICK_WINMM 1)

      set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/joystick/windows/SDL_mmjoystick.c)

    endif()

    set(HAVE_SDL_JOYSTICK TRUE)

  endif()

  if(SDL_HAPTIC AND HAVE_DINPUT_H)

    set(SDL_HAPTIC_DINPUT 1)

    set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/haptic/windows/SDL_syshaptic.c)

    set(HAVE_SDL_HAPTIC TRUE)

  endif()

  file(GLOB VERSION_SOURCES ${SDL2_SOURCE_DIR}/src/main/windows/*.rc)

  file(GLOB SDLMAIN_SOURCES ${SDL2_SOURCE_DIR}/src/main/windows/*.c)

  if(MINGW OR CYGWIN)

    list(APPEND EXTRA_LIBS mingw32)

    list(APPEND EXTRA_LDFLAGS "-mwindows")

    set(SDL_CFLAGS "${SDL_CFLAGS} -Dmain=SDL_main")

    list(APPEND SDL_LIBS "-lmingw32" "-lSDL2main" "-mwindows")

  endif()

elseif(APPLE)

  # TODO: rework this for proper MacOS X, iOS and Darwin support

  # Requires the darwin file implementation

  if(SDL_FILE)

    file(GLOB EXTRA_SOURCES ${PROJECT_SOURCE_DIR}/src/file/cocoa/*.m)

    set(SOURCE_FILES ${EXTRA_SOURCES} ${SOURCE_FILES})

    set_source_files_properties(${EXTRA_SOURCES} PROPERTIES LANGUAGE C)

    set(HAVE_SDL_FILE TRUE)

    set(SDL_FRAMEWORK_COCOA 1)

  else()

    message_error("SDL_FILE must be enabled to build on MacOS X")

  endif()

  if(SDL_AUDIO)

    set(MACOSX_COREAUDIO 1)

    file(GLOB AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/coreaudio/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${AUDIO_SOURCES})

    set(HAVE_SDL_AUDIO TRUE)

    set(SDL_FRAMEWORK_COREAUDIO 1)

    set(SDL_FRAMEWORK_AUDIOUNIT 1)

  endif()

  if(SDL_JOYSTICK)

    set(SDL_JOYSTICK_IOKIT 1)

    file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/darwin/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${JOYSTICK_SOURCES})

    set(HAVE_SDL_JOYSTICK TRUE)

    set(SDL_FRAMEWORK_IOKIT 1)

    set(SDL_FRAMEWORK_FF 1)

  endif()

  if(SDL_HAPTIC)

    set(SDL_HAPTIC_IOKIT 1)

    file(GLOB HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/darwin/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${HAPTIC_SOURCES})

    set(HAVE_SDL_HAPTIC TRUE)

    set(SDL_FRAMEWORK_IOKIT 1)

    set(SDL_FRAMEWORK_FF 1)

    if(NOT SDL_JOYSTICK)

      message(FATAL_ERROR "SDL_HAPTIC requires SDL_JOYSTICK to be enabled")

    endif()

  endif()

  if(SDL_POWER)

    set(SDL_POWER_MACOSX 1)

    file(GLOB POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/macosx/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${POWER_SOURCES})

    set(HAVE_SDL_POWER TRUE)

    set(SDL_FRAMEWORK_CARBON 1)

    set(SDL_FRAMEWORK_IOKIT 1)

  endif()

  if(SDL_TIMERS)

    set(SDL_TIMER_UNIX 1)

    file(GLOB TIMER_SOURCES ${SDL2_SOURCE_DIR}/src/timer/unix/*.c)

    set(SOURCE_FILES ${SOURCE_FILES} ${TIMER_SOURCES})

    set(HAVE_SDL_TIMERS TRUE)