# Locate SDL2 library

# This module defines

# SDL2_LIBRARY, the name of the library to link against

# SDL2_FOUND, if false, do not try to link to SDL2

# SDL2_INCLUDE_DIR, where to find SDL.h

#

# This module responds to the the flag:

# SDL2_BUILDING_LIBRARY

# If this is defined, then no SDL2main will be linked in because

# only applications need main().

# Otherwise, it is assumed you are building an application and this

# module will attempt to locate and set the the proper link flags

# as part of the returned SDL2_LIBRARY variable.

#

# Don't forget to include SDLmain.h and SDLmain.m your project for the

# OS X framework based version. (Other versions link to -lSDL2main which

# this module will try to find on your behalf.) Also for OS X, this

# module will automatically add the -framework Cocoa on your behalf.

#

#

# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration

# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library

# (SDL2.dll, libsdl2.so, SDL2.framework, etc).

# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.

# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value

# as appropriate. These values are used to generate the final SDL2_LIBRARY

# variable, but when these values are unset, SDL2_LIBRARY does not get created.

#

#

# $SDL2DIR is an environment variable that would

# correspond to the ./configure --prefix=$SDL2DIR

# used in building SDL2.

# l.e.galup  9-20-02

#

# Modified by Eric Wing.

# Added code to assist with automated building by using environmental variables

# and providing a more controlled/consistent search behavior.

# Added new modifications to recognize OS X frameworks and

# additional Unix paths (FreeBSD, etc).

# Also corrected the header search path to follow "proper" SDL guidelines.

# Added a search for SDL2main which is needed by some platforms.

# Added a search for threads which is needed by some platforms.

# Added needed compile switches for MinGW.

#

# On OSX, this will prefer the Framework version (if found) over others.

# People will have to manually change the cache values of

# SDL2_LIBRARY to override this selection or set the CMake environment

# CMAKE_INCLUDE_PATH to modify the search paths.

#

# Note that the header path has changed from SDL2/SDL.h to just SDL.h

# This needed to change because "proper" SDL convention

# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability

# reasons because not all systems place things in SDL2/ (see FreeBSD).

#=============================================================================

# Copyright 2003-2009 Kitware, Inc.

#

# Distributed under the OSI-approved BSD License (the "License");

# see accompanying file Copyright.txt for details.

#

# This software is distributed WITHOUT ANY WARRANTY; without even the

# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

# See the License for more information.

#=============================================================================

# (To distribute this file outside of CMake, substitute the full

#  License text for the above reference.)

SET(SDL2_SEARCH_PATHS

    ~/Library/Frameworks

    /Library/Frameworks

    /usr/local

    /usr

    /sw # Fink

    /opt/local # DarwinPorts

    /opt/csw # Blastwave

    /opt

)

FIND_PATH(SDL2_INCLUDE_DIR SDL.h

    HINTS

    $ENV{SDL2DIR}

    PATH_SUFFIXES include/SDL2 include

    PATHS ${SDL2_SEARCH_PATHS}

)

FIND_LIBRARY(SDL2_LIBRARY_TEMP

    NAMES SDL2

    HINTS

    $ENV{SDL2DIR}

    PATH_SUFFIXES lib64 lib

    PATHS ${SDL2_SEARCH_PATHS}

)

IF(NOT SDL2_BUILDING_LIBRARY)

    IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")

        # Non-OS X framework versions expect you to also dynamically link to

        # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms

        # seem to provide SDL2main for compatibility even though they don't

        # necessarily need it.

        FIND_LIBRARY(SDL2MAIN_LIBRARY

            NAMES SDL2main

            HINTS

            $ENV{SDL2DIR}

            PATH_SUFFIXES lib64 lib

            PATHS ${SDL2_SEARCH_PATHS}

        )

    ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")

ENDIF(NOT SDL2_BUILDING_LIBRARY)

# SDL2 may require threads on your system.

# The Apple build may not need an explicit flag because one of the

# frameworks may already provide it.

# But for non-OSX systems, I will use the CMake Threads package.

IF(NOT APPLE)

    FIND_PACKAGE(Threads)

ENDIF(NOT APPLE)

# MinGW needs an additional library, mwindows

# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows

# (Actually on second look, I think it only needs one of the m* libraries.)

IF(MINGW)

    SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")

ENDIF(MINGW)

IF(SDL2_LIBRARY_TEMP)

    # For SDL2main

    IF(NOT SDL2_BUILDING_LIBRARY)

        IF(SDL2MAIN_LIBRARY)

            SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})

        ENDIF(SDL2MAIN_LIBRARY)

    ENDIF(NOT SDL2_BUILDING_LIBRARY)

    # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.

    # CMake doesn't display the -framework Cocoa string in the UI even

    # though it actually is there if I modify a pre-used variable.

    # I think it has something to do with the CACHE STRING.

    # So I use a temporary variable until the end so I can set the

    # "real" variable in one-shot.

    IF(APPLE)

        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")

    ENDIF(APPLE)

    # For threads, as mentioned Apple doesn't need this.

    # In fact, there seems to be a problem if I used the Threads package

    # and try using this line, so I'm just skipping it entirely for OS X.

    IF(NOT APPLE)

        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})

    ENDIF(NOT APPLE)

    # For MinGW library

    IF(MINGW)

        SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})

    ENDIF(MINGW)

    # Set the final string here so the GUI reflects the final state.

    SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")

    # Set the temp variable to INTERNAL so it is not seen in the CMake GUI

    SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")

ENDIF(SDL2_LIBRARY_TEMP)

if(BUILD_ENGINE_JS)

    set(SDL2_LIBRARY "sdl2_emscripten_internal" CACHE STRING "emscripten override" FORCE)

    set(SDL2_INCLUDE_DIR "${CMAKE_SYSTEM_INCLUDE_PATH}/SDL" CACHE STRING "emscripten override" FORCE)

endif()

INCLUDE(FindPackageHandleStandardArgs)

FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)