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+# This module defines
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+# SDL2_LIBRARY, the name of the library to link against
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+# SDL2_FOUND, if false, do not try to link to SDL2
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+# SDL2_INCLUDE_DIR, where to find SDL.h
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+#
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+# This module responds to the the flag:
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+# SDL2_BUILDING_LIBRARY
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+# If this is defined, then no SDL2main will be linked in because
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+# only applications need main().
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+# Otherwise, it is assumed you are building an application and this
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+# module will attempt to locate and set the the proper link flags
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+# as part of the returned SDL2_LIBRARY variable.
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+#
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+# Don't forget to include SDLmain.h and SDLmain.m your project for the
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+# OS X framework based version. (Other versions link to -lSDL2main which
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+# this module will try to find on your behalf.) Also for OS X, this
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+# module will automatically add the -framework Cocoa on your behalf.
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+#
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+#
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+# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
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+# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
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+# (SDL2.dll, libsdl2.so, SDL2.framework, etc).
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+# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
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+# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
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+# as appropriate. These values are used to generate the final SDL2_LIBRARY
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+# variable, but when these values are unset, SDL2_LIBRARY does not get created.
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+#
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+#
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+# $SDL2DIR is an environment variable that would
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+# correspond to the ./configure --prefix=$SDL2DIR
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+# used in building SDL2.
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+# l.e.galup 9-20-02
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+#
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+# Modified by Eric Wing.
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+# Added code to assist with automated building by using environmental variables
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+# and providing a more controlled/consistent search behavior.
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+# Added new modifications to recognize OS X frameworks and
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+# additional Unix paths (FreeBSD, etc).
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+# Also corrected the header search path to follow "proper" SDL guidelines.
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+# Added a search for SDL2main which is needed by some platforms.
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+# Added a search for threads which is needed by some platforms.
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+# Added needed compile switches for MinGW.
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+#
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+# On OSX, this will prefer the Framework version (if found) over others.
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+# People will have to manually change the cache values of
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+# SDL2_LIBRARY to override this selection or set the CMake environment
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+# CMAKE_INCLUDE_PATH to modify the search paths.
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+#
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+# Note that the header path has changed from SDL2/SDL.h to just SDL.h
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+# This needed to change because "proper" SDL convention
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+# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
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+# reasons because not all systems place things in SDL2/ (see FreeBSD).
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+
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+#=============================================================================
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+# Copyright 2003-2009 Kitware, Inc.
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+#
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+# Distributed under the OSI-approved BSD License (the "License");
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+# see accompanying file Copyright.txt for details.
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+#
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+# This software is distributed WITHOUT ANY WARRANTY; without even the
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+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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+# See the License for more information.
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+#=============================================================================
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+# (To distribute this file outside of CMake, substitute the full
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+# License text for the above reference.)
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+
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+SET(SDL2_SEARCH_PATHS
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+ ~/Library/Frameworks
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+ /Library/Frameworks
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+ /usr/local
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+ /usr
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+ /sw # Fink
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+ /opt/local # DarwinPorts
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+ /opt/csw # Blastwave
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+ /opt
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+ ${SDL2_PATH}
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+)
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+
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+FIND_PATH(SDL2_INCLUDE_DIR SDL.h
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+ HINTS
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+ $ENV{SDL2DIR}
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+ PATH_SUFFIXES include/SDL2 include
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+ PATHS ${SDL2_SEARCH_PATHS}
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+)
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+
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+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
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+ set(PATH_SUFFIXES lib64 lib/x64 lib)
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+else()
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+ set(PATH_SUFFIXES lib/x86 lib)
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+endif()
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+
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+FIND_LIBRARY(SDL2_LIBRARY_TEMP
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+ NAMES SDL2
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+ HINTS
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+ $ENV{SDL2DIR}
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+ PATH_SUFFIXES ${PATH_SUFFIXES}
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+ PATHS ${SDL2_SEARCH_PATHS}
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+)
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+
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+IF(NOT SDL2_BUILDING_LIBRARY)
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+ IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
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+ # Non-OS X framework versions expect you to also dynamically link to
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+ # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
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+ # seem to provide SDL2main for compatibility even though they don't
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+ # necessarily need it.
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+ FIND_LIBRARY(SDL2MAIN_LIBRARY
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+ NAMES SDL2main
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+ HINTS
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+ $ENV{SDL2DIR}
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+ PATH_SUFFIXES ${PATH_SUFFIXES}
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+ PATHS ${SDL2_SEARCH_PATHS}
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+ )
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+ ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
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+ENDIF(NOT SDL2_BUILDING_LIBRARY)
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+
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+# SDL2 may require threads on your system.
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+# The Apple build may not need an explicit flag because one of the
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+# frameworks may already provide it.
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+# But for non-OSX systems, I will use the CMake Threads package.
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+IF(NOT APPLE)
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+ FIND_PACKAGE(Threads)
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+ENDIF(NOT APPLE)
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+
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+# MinGW needs an additional link flag, -mwindows
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+# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -mwindows
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+IF(MINGW)
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+ SET(MINGW32_LIBRARY mingw32 "-mwindows" CACHE STRING "mwindows for MinGW")
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+ENDIF(MINGW)
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+
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+IF(SDL2_LIBRARY_TEMP)
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+ # For SDL2main
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+ IF(NOT SDL2_BUILDING_LIBRARY)
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+ IF(SDL2MAIN_LIBRARY)
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+ SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
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+ ENDIF(SDL2MAIN_LIBRARY)
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+ ENDIF(NOT SDL2_BUILDING_LIBRARY)
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+
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+ # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
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+ # CMake doesn't display the -framework Cocoa string in the UI even
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+ # though it actually is there if I modify a pre-used variable.
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+ # I think it has something to do with the CACHE STRING.
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+ # So I use a temporary variable until the end so I can set the
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+ # "real" variable in one-shot.
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+ IF(APPLE)
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+ SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
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+ ENDIF(APPLE)
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+
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+ # For threads, as mentioned Apple doesn't need this.
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+ # In fact, there seems to be a problem if I used the Threads package
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+ # and try using this line, so I'm just skipping it entirely for OS X.
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+ IF(NOT APPLE)
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+ SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
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+ ENDIF(NOT APPLE)
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+
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+ # For MinGW library
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+ IF(MINGW)
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+ SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
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+ ENDIF(MINGW)
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+
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+ # Set the final string here so the GUI reflects the final state.
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+ SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
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+ # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
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+ SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
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+ENDIF(SDL2_LIBRARY_TEMP)
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+
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+INCLUDE(FindPackageHandleStandardArgs)
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+
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+FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
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Andy Li