1 # - Locates the SDL_sound library
3 # This module depends on SDL being found and
4 # must be called AFTER FindSDL.cmake is called.
7 # SDL_SOUND_INCLUDE_DIR, where to find SDL_sound.h
8 # SDL_SOUND_FOUND, if false, do not try to link to SDL_sound
9 # SDL_SOUND_LIBRARIES, this contains the list of libraries that you need
10 # to link against. This is a read-only variable and is marked INTERNAL.
11 # SDL_SOUND_EXTRAS, this is an optional variable for you to add your own
12 # flags to SDL_SOUND_LIBRARIES. This is prepended to SDL_SOUND_LIBRARIES.
13 # This is available mostly for cases this module failed to anticipate for
14 # and you must add additional flags. This is marked as ADVANCED.
15 # SDL_SOUND_VERSION_STRING, human-readable string containing the version of SDL_sound
17 # This module also defines (but you shouldn't need to use directly)
18 # SDL_SOUND_LIBRARY, the name of just the SDL_sound library you would link
19 # against. Use SDL_SOUND_LIBRARIES for you link instructions and not this one.
20 # And might define the following as needed
29 # Typically, you should not use these variables directly, and you should use
30 # SDL_SOUND_LIBRARIES which contains SDL_SOUND_LIBRARY and the other audio libraries
31 # (if needed) to successfully compile on your system.
33 # Created by Eric Wing.
34 # This module is a bit more complicated than the other FindSDL* family modules.
35 # The reason is that SDL_sound can be compiled in a large variety of different ways
36 # which are independent of platform. SDL_sound may dynamically link against other 3rd
37 # party libraries to get additional codec support, such as Ogg Vorbis, SMPEG, ModPlug,
38 # MikMod, FLAC, Speex, and potentially others.
39 # Under some circumstances which I don't fully understand,
40 # there seems to be a requirement
41 # that dependent libraries of libraries you use must also be explicitly
42 # linked against in order to successfully compile. SDL_sound does not currently
43 # have any system in place to know how it was compiled.
44 # So this CMake module does the hard work in trying to discover which 3rd party
45 # libraries are required for building (if any).
46 # This module uses a brute force approach to create a test program that uses SDL_sound,
47 # and then tries to build it. If the build fails, it parses the error output for
48 # known symbol names to figure out which libraries are needed.
50 # Responds to the $SDLDIR and $SDLSOUNDDIR environmental variable that would
51 # correspond to the ./configure --prefix=$SDLDIR used in building SDL.
53 # On OSX, this will prefer the Framework version (if found) over others.
54 # People will have to manually change the cache values of
55 # SDL_LIBRARY to override this selectionor set the CMake environment
56 # CMAKE_INCLUDE_PATH to modify the search paths.
58 #=============================================================================
59 # Copyright 2005-2009 Kitware, Inc.
60 # Copyright 2012 Benjamin Eikel
62 # Distributed under the OSI-approved BSD License (the "License");
63 # see accompanying file Copyright.txt for details.
65 # This software is distributed WITHOUT ANY WARRANTY; without even the
66 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
67 # See the License for more information.
68 #=============================================================================
69 # (To distribute this file outside of CMake, substitute the full
70 # License text for the above reference.)
72 set(SDL_SOUND_EXTRAS "" CACHE STRING "SDL_sound extra flags")
73 mark_as_advanced(SDL_SOUND_EXTRAS)
76 find_path(SDL_SOUND_INCLUDE_DIR SDL_sound.h
80 PATH_SUFFIXES include/SDL include/SDL12 include/SDL11 include
83 find_library(SDL_SOUND_LIBRARY
91 if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
93 # CMake is giving me problems using TRY_COMPILE with the CMAKE_FLAGS
94 # for the :STRING syntax if I have multiple values contained in a
95 # single variable. This is a problem for the SDL_LIBRARY variable
96 # because it does just that. When I feed this variable to the command,
97 # only the first value gets the appropriate modifier (e.g. -I) and
98 # the rest get dropped.
99 # To get multiple single variables to work, I must separate them with a "\;"
100 # I could go back and modify the FindSDL.cmake module, but that's kind of painful.
101 # The solution would be to try something like:
102 # set(SDL_TRY_COMPILE_LIBRARY_LIST "${SDL_TRY_COMPILE_LIBRARY_LIST}\;${CMAKE_THREAD_LIBS_INIT}")
103 # Instead, it was suggested on the mailing list to write a temporary CMakeLists.txt
104 # with a temporary test project and invoke that with TRY_COMPILE.
105 # See message thread "Figuring out dependencies for a library in order to build"
109 # ${CMAKE_BINARY_DIR}
110 # ${PROJECT_SOURCE_DIR}/DetermineSoundLibs.c
112 # -DINCLUDE_DIRECTORIES:STRING=${SDL_INCLUDE_DIR}\;${SDL_SOUND_INCLUDE_DIR}
113 # -DLINK_LIBRARIES:STRING=${SDL_SOUND_LIBRARY}\;${SDL_LIBRARY}
114 # OUTPUT_VARIABLE MY_OUTPUT
117 # To minimize external dependencies, create a sdlsound test program
118 # which will be used to figure out if additional link dependencies are
119 # required for the link phase.
120 file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/DetermineSoundLibs.c
121 "#include \"SDL_sound.h\"
123 int main(int argc, char* argv[])
125 Sound_AudioInfo desired;
126 Sound_Sample* sample;
131 /* This doesn't actually have to work, but Init() is a no-op
132 * for some of the decoders, so this should force more symbols
135 sample = Sound_NewSampleFromFile(argv[1], &desired, 4096);
144 # target_link_libraries(DetermineSoundLibs "${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
145 # causes problems when SDL_LIBRARY looks like
146 # /Library/Frameworks/SDL.framework;-framework Cocoa
147 # The ;-framework Cocoa seems to be confusing CMake once the OS X
148 # framework support was added. I was told that breaking up the list
149 # would fix the problem.
151 foreach(lib ${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
152 set(TMP_TRY_LIBS "${TMP_TRY_LIBS} \"${lib}\"")
155 # message("TMP_TRY_LIBS ${TMP_TRY_LIBS}")
157 # Write the CMakeLists.txt and test project
158 # Weird, this is still sketchy. If I don't quote the variables
159 # in the TARGET_LINK_LIBRARIES, I seem to loose everything
160 # in the SDL_LIBRARY string after the "-framework".
161 # But if I quote the stuff in INCLUDE_DIRECTORIES, it doesn't work.
162 file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/CMakeLists.txt
163 "cmake_minimum_required(VERSION 2.8)
164 project(DetermineSoundLibs)
165 include_directories(${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
166 add_executable(DetermineSoundLibs DetermineSoundLibs.c)
167 target_link_libraries(DetermineSoundLibs ${TMP_TRY_LIBS})"
172 ${PROJECT_BINARY_DIR}/CMakeTmp
173 ${PROJECT_BINARY_DIR}/CMakeTmp
175 OUTPUT_VARIABLE MY_OUTPUT
178 # message("${MY_RESULT}")
179 # message(${MY_OUTPUT})
183 # I expect that MPGLIB, VOC, WAV, AIFF, and SHN are compiled in statically.
184 # I think Timidity is also compiled in statically.
185 # I've never had to explcitly link against Quicktime, so I'll skip that for now.
187 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARY})
190 if("${MY_OUTPUT}" MATCHES "MikMod_")
191 find_library(MIKMOD_LIBRARY
192 NAMES libmikmod-coreaudio mikmod
205 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MIKMOD_LIBRARY})
206 endif(MIKMOD_LIBRARY)
207 endif("${MY_OUTPUT}" MATCHES "MikMod_")
210 if("${MY_OUTPUT}" MATCHES "MODPLUG_")
211 find_library(MODPLUG_LIBRARY
225 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MODPLUG_LIBRARY})
230 # Find Ogg and Vorbis
231 if("${MY_OUTPUT}" MATCHES "ov_")
232 find_library(VORBIS_LIBRARY
233 NAMES vorbis Vorbis VORBIS
247 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${VORBIS_LIBRARY})
250 find_library(OGG_LIBRARY
265 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
271 if("${MY_OUTPUT}" MATCHES "SMPEG_")
272 find_library(SMPEG_LIBRARY
273 NAMES smpeg SMPEG Smpeg SMpeg
286 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SMPEG_LIBRARY})
292 if("${MY_OUTPUT}" MATCHES "FLAC_")
293 find_library(FLAC_LIBRARY
307 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${FLAC_LIBRARY})
312 # Hmmm...Speex seems to depend on Ogg. This might be a problem if
313 # the TRY_COMPILE attempt gets blocked at SPEEX before it can pull
314 # in the Ogg symbols. I'm not sure if I should duplicate the ogg stuff
315 # above for here or if two ogg entries will screw up things.
316 if("${MY_OUTPUT}" MATCHES "speex_")
317 find_library(SPEEX_LIBRARY
331 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SPEEX_LIBRARY})
334 # Find OGG (needed for Speex)
335 # We might have already found Ogg for Vorbis, so skip it if so.
337 find_library(OGG_LIBRARY
352 set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
358 set(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARY}" CACHE INTERNAL "SDL_sound and dependent libraries")
361 set(SDL_SOUND_LIBRARIES "${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARIES_TMP}" CACHE INTERNAL "SDL_sound and dependent libraries")
364 if(SDL_SOUND_INCLUDE_DIR AND EXISTS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h")
365 file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_MAJOR_LINE REGEX "^#define[ \t]+SOUND_VER_MAJOR[ \t]+[0-9]+$")
366 file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_MINOR_LINE REGEX "^#define[ \t]+SOUND_VER_MINOR[ \t]+[0-9]+$")
367 file(STRINGS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h" SDL_SOUND_VERSION_PATCH_LINE REGEX "^#define[ \t]+SOUND_VER_PATCH[ \t]+[0-9]+$")
368 string(REGEX REPLACE "^#define[ \t]+SOUND_VER_MAJOR[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_MAJOR "${SDL_SOUND_VERSION_MAJOR_LINE}")
369 string(REGEX REPLACE "^#define[ \t]+SOUND_VER_MINOR[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_MINOR "${SDL_SOUND_VERSION_MINOR_LINE}")
370 string(REGEX REPLACE "^#define[ \t]+SOUND_VER_PATCH[ \t]+([0-9]+)$" "\\1" SDL_SOUND_VERSION_PATCH "${SDL_SOUND_VERSION_PATCH_LINE}")
371 set(SDL_SOUND_VERSION_STRING ${SDL_SOUND_VERSION_MAJOR}.${SDL_SOUND_VERSION_MINOR}.${SDL_SOUND_VERSION_PATCH})
372 unset(SDL_SOUND_VERSION_MAJOR_LINE)
373 unset(SDL_SOUND_VERSION_MINOR_LINE)
374 unset(SDL_SOUND_VERSION_PATCH_LINE)
375 unset(SDL_SOUND_VERSION_MAJOR)
376 unset(SDL_SOUND_VERSION_MINOR)
377 unset(SDL_SOUND_VERSION_PATCH)
380 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
382 FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL_sound
383 REQUIRED_VARS SDL_SOUND_LIBRARY SDL_SOUND_INCLUDE_DIR
384 VERSION_VAR SDL_SOUND_VERSION_STRING)