1# Locate SDL2 library
2# This module defines
3# SDL2_LIBRARY, the name of the library to link against
4# SDL2_FOUND, if false, do not try to link to SDL2
5# SDL2_INCLUDE_DIR, where to find SDL.h
6#
7# This module responds to the the flag:
8# SDL2_BUILDING_LIBRARY
9# If this is defined, then no SDL2main will be linked in because
10# only applications need main().
11# Otherwise, it is assumed you are building an application and this
12# module will attempt to locate and set the the proper link flags
13# as part of the returned SDL2_LIBRARY variable.
14#
15# Don't forget to include SDLmain.h and SDLmain.m your project for the
16# OS X framework based version. (Other versions link to -lSDL2main which
17# this module will try to find on your behalf.) Also for OS X, this
18# module will automatically add the -framework Cocoa on your behalf.
19#
20#
21# Additional Note: If you see an empty SDL2_LIBRARY_TEMP in your configuration
22# and no SDL2_LIBRARY, it means CMake did not find your SDL2 library
23# (SDL2.dll, libsdl2.so, SDL2.framework, etc).
24# Set SDL2_LIBRARY_TEMP to point to your SDL2 library, and configure again.
25# Similarly, if you see an empty SDL2MAIN_LIBRARY, you should set this value
26# as appropriate. These values are used to generate the final SDL2_LIBRARY
27# variable, but when these values are unset, SDL2_LIBRARY does not get created.
28#
29#
30# $SDL2DIR is an environment variable that would
31# correspond to the ./configure --prefix=$SDL2DIR
32# used in building SDL2.
33# l.e.galup  9-20-02
34#
35# Modified by Eric Wing.
36# Added code to assist with automated building by using environmental variables
37# and providing a more controlled/consistent search behavior.
38# Added new modifications to recognize OS X frameworks and
39# additional Unix paths (FreeBSD, etc).
40# Also corrected the header search path to follow "proper" SDL guidelines.
41# Added a search for SDL2main which is needed by some platforms.
42# Added a search for threads which is needed by some platforms.
43# Added needed compile switches for MinGW.
44#
45# On OSX, this will prefer the Framework version (if found) over others.
46# People will have to manually change the cache values of
47# SDL2_LIBRARY to override this selection or set the CMake environment
48# CMAKE_INCLUDE_PATH to modify the search paths.
49#
50# Note that the header path has changed from SDL2/SDL.h to just SDL.h
51# This needed to change because "proper" SDL convention
52# is #include "SDL.h", not <SDL2/SDL.h>. This is done for portability
53# reasons because not all systems place things in SDL2/ (see FreeBSD).
54
55#=============================================================================
56# Copyright 2003-2009 Kitware, Inc.
57#
58# Distributed under the OSI-approved BSD License (the "License");
59# see accompanying file Copyright.txt for details.
60#
61# This software is distributed WITHOUT ANY WARRANTY; without even the
62# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
63# See the License for more information.
64#=============================================================================
65# (To distribute this file outside of CMake, substitute the full
66#  License text for the above reference.)
67
68SET(SDL2_SEARCH_PATHS
69    ~/Library/Frameworks
70    /Library/Frameworks
71    /usr/local
72    /usr
73    /sw # Fink
74    /opt/local # DarwinPorts
75    /opt/csw # Blastwave
76    /opt
77)
78
79FIND_PATH(SDL2_INCLUDE_DIR SDL.h
80    HINTS
81    $ENV{SDL2DIR}
82    PATH_SUFFIXES include/SDL2 include
83    PATHS ${SDL2_SEARCH_PATHS}
84)
85
86FIND_LIBRARY(SDL2_LIBRARY_TEMP
87    NAMES SDL2
88    HINTS
89    $ENV{SDL2DIR}
90    PATH_SUFFIXES lib64 lib
91    PATHS ${SDL2_SEARCH_PATHS}
92)
93
94IF(NOT SDL2_BUILDING_LIBRARY)
95    IF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
96        # Non-OS X framework versions expect you to also dynamically link to
97        # SDL2main. This is mainly for Windows and OS X. Other (Unix) platforms
98        # seem to provide SDL2main for compatibility even though they don't
99        # necessarily need it.
100        FIND_LIBRARY(SDL2MAIN_LIBRARY
101            NAMES SDL2main
102            HINTS
103            $ENV{SDL2DIR}
104            PATH_SUFFIXES lib64 lib
105            PATHS ${SDL2_SEARCH_PATHS}
106        )
107    ENDIF(NOT ${SDL2_INCLUDE_DIR} MATCHES ".framework")
108ENDIF(NOT SDL2_BUILDING_LIBRARY)
109
110# SDL2 may require threads on your system.
111# The Apple build may not need an explicit flag because one of the
112# frameworks may already provide it.
113# But for non-OSX systems, I will use the CMake Threads package.
114IF(NOT APPLE)
115    FIND_PACKAGE(Threads)
116ENDIF(NOT APPLE)
117
118# MinGW needs an additional library, mwindows
119# It's total link flags should look like -lmingw32 -lSDL2main -lSDL2 -lmwindows
120# (Actually on second look, I think it only needs one of the m* libraries.)
121IF(MINGW)
122    SET(MINGW32_LIBRARY mingw32 CACHE STRING "mwindows for MinGW")
123ENDIF(MINGW)
124
125IF(SDL2_LIBRARY_TEMP)
126    # For SDL2main
127    IF(NOT SDL2_BUILDING_LIBRARY)
128        IF(SDL2MAIN_LIBRARY)
129            SET(SDL2_LIBRARY_TEMP ${SDL2MAIN_LIBRARY} ${SDL2_LIBRARY_TEMP})
130        ENDIF(SDL2MAIN_LIBRARY)
131    ENDIF(NOT SDL2_BUILDING_LIBRARY)
132
133    # For OS X, SDL2 uses Cocoa as a backend so it must link to Cocoa.
134    # CMake doesn't display the -framework Cocoa string in the UI even
135    # though it actually is there if I modify a pre-used variable.
136    # I think it has something to do with the CACHE STRING.
137    # So I use a temporary variable until the end so I can set the
138    # "real" variable in one-shot.
139    IF(APPLE)
140        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} "-framework Cocoa")
141    ENDIF(APPLE)
142
143    # For threads, as mentioned Apple doesn't need this.
144    # In fact, there seems to be a problem if I used the Threads package
145    # and try using this line, so I'm just skipping it entirely for OS X.
146    IF(NOT APPLE)
147        SET(SDL2_LIBRARY_TEMP ${SDL2_LIBRARY_TEMP} ${CMAKE_THREAD_LIBS_INIT})
148    ENDIF(NOT APPLE)
149
150    # For MinGW library
151    IF(MINGW)
152        SET(SDL2_LIBRARY_TEMP ${MINGW32_LIBRARY} ${SDL2_LIBRARY_TEMP})
153    ENDIF(MINGW)
154
155    # Set the final string here so the GUI reflects the final state.
156    SET(SDL2_LIBRARY ${SDL2_LIBRARY_TEMP} CACHE STRING "Where the SDL2 Library can be found")
157    # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
158    SET(SDL2_LIBRARY_TEMP "${SDL2_LIBRARY_TEMP}" CACHE INTERNAL "")
159ENDIF(SDL2_LIBRARY_TEMP)
160
161if(BUILD_ENGINE_JS)
162    set(SDL2_LIBRARY "sdl2_emscripten_internal" CACHE STRING "emscripten override" FORCE)
163    set(SDL2_INCLUDE_DIR "${CMAKE_SYSTEM_INCLUDE_PATH}/SDL" CACHE STRING "emscripten override" FORCE)
164endif()
165
166INCLUDE(FindPackageHandleStandardArgs)
167
168FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2 REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
169
170