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Update the examples to use SDL2

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This should make it easier to build the examples on 64-bit, where there are no
premade dev libs for SDL1 on 64-bit mingw. FindSDL_sound.cmake has been
updated to accept SDL or SDL2.
This commit is contained in:
Chris Robinson 2014-05-23 12:14:51 -07:00
parent 5ef5d218c4
commit 13eac2552e
4 changed files with 478 additions and 280 deletions
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30
CMakeLists.txt
View File

@ -901,11 +901,11 @@ IF(ALSOFT_UTILS AND NOT ALSOFT_NO_CONFIG_UTIL)
add_subdirectory(utils/alsoft-config)
ENDIF()
IF(ALSOFT_EXAMPLES)
FIND_PACKAGE(SDL)
IF(SDL_FOUND)
FIND_PACKAGE(SDL2)
IF(SDL2_FOUND)
FIND_PACKAGE(SDL_sound)
IF(SDL_SOUND_FOUND AND CMAKE_VERSION VERSION_LESS "2.8.8")
INCLUDE_DIRECTORIES(${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
INCLUDE_DIRECTORIES(${SDL2_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
ENDIF()
ENDIF()
ENDIF()
@ -1056,26 +1056,30 @@ IF(ALSOFT_UTILS)
ENDIF()
IF(ALSOFT_EXAMPLES)
IF(SDL_FOUND AND SDL_SOUND_FOUND)
IF(SDL2_FOUND AND SDL_SOUND_FOUND)
ADD_LIBRARY(ex-common STATIC examples/common/alhelpers.c
examples/common/sdl_sound.c)
SET_PROPERTY(TARGET ex-common APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL_SOUND_INCLUDE_DIR})
SET_PROPERTY(TARGET ex-common APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR}
${SDL_SOUND_INCLUDE_DIR})
ADD_EXECUTABLE(alstream examples/alstream.c)
TARGET_LINK_LIBRARIES(alstream ex-common ${SDL_SOUND_LIBRARIES} ${LIBNAME})
SET_PROPERTY(TARGET alstream APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL_SOUND_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(alstream ex-common ${SDL_SOUND_LIBRARIES} ${SDL2_LIBRARY} ${LIBNAME})
SET_PROPERTY(TARGET alstream APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR}
${SDL_SOUND_INCLUDE_DIR})
ADD_EXECUTABLE(alreverb examples/alreverb.c)
TARGET_LINK_LIBRARIES(alreverb ex-common ${SDL_SOUND_LIBRARIES} ${LIBNAME})
SET_PROPERTY(TARGET alreverb APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL_SOUND_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(alreverb ex-common ${SDL_SOUND_LIBRARIES} ${SDL2_LIBRARY} ${LIBNAME})
SET_PROPERTY(TARGET alreverb APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR}
${SDL_SOUND_INCLUDE_DIR})
ADD_EXECUTABLE(allatency examples/allatency.c)
TARGET_LINK_LIBRARIES(allatency ex-common ${SDL_SOUND_LIBRARIES} ${LIBNAME})
SET_PROPERTY(TARGET allatency APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL_SOUND_INCLUDE_DIR})
TARGET_LINK_LIBRARIES(allatency ex-common ${SDL_SOUND_LIBRARIES} ${SDL2_LIBRARY} ${LIBNAME})
SET_PROPERTY(TARGET allatency APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR}
${SDL_SOUND_INCLUDE_DIR})
ADD_EXECUTABLE(alloopback examples/alloopback.c)
TARGET_LINK_LIBRARIES(alloopback ex-common ${SDL_SOUND_LIBRARIES} ${SDL_LIBRARY} ${LIBNAME})
SET_PROPERTY(TARGET alloopback APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL_INCLUDE_DIR}
TARGET_LINK_LIBRARIES(alloopback ex-common ${SDL_SOUND_LIBRARIES} ${SDL2_LIBRARY} ${LIBNAME})
SET_PROPERTY(TARGET alloopback APPEND PROPERTY INCLUDE_DIRECTORIES ${SDL2_INCLUDE_DIR}
${SDL_SOUND_INCLUDE_DIR})
INSTALL(TARGETS alstream alreverb allatency alloopback

193
cmake/FindSDL2.cmake Normal file
View File

@ -0,0 +1,193 @@
# 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 SDL2_main 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 SDL2main.h and SDL2main.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" SDL2 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" SDL2 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).
#
# Ported by Johnny Patterson. This is a literal port for SDL2 of the FindSDL.cmake
# module with the minor edit of changing "SDL" to "SDL2" where necessary. This
# was not created for redistribution, and exists temporarily pending official
# SDL2 CMake modules.
#=============================================================================
# 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.)
FIND_PATH(SDL2_INCLUDE_DIR SDL.h
HINTS
$ENV{SDL2DIR}
PATH_SUFFIXES include/SDL2 include
PATHS
~/Library/Frameworks
/Library/Frameworks
/usr/local/include/SDL2
/usr/include/SDL2
/sw # Fink
/opt/local # DarwinPorts
/opt/csw # Blastwave
/opt
)
#MESSAGE("SDL2_INCLUDE_DIR is ${SDL2_INCLUDE_DIR}")
FIND_LIBRARY(SDL2_LIBRARY_TEMP
NAMES SDL2
HINTS
$ENV{SDL2DIR}
PATH_SUFFIXES lib64 lib
PATHS
/sw
/opt/local
/opt/csw
/opt
)
#MESSAGE("SDL2_LIBRARY_TEMP is ${SDL2_LIBRARY_TEMP}")
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
/sw
/opt/local
/opt/csw
/opt
)
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)
SET(SDL2_FOUND "NO")
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)
IF(WIN32)
SET(SDL2_LIBRARY_TEMP winmm imm32 version msimg32 ${SDL2_LIBRARY_TEMP})
ENDIF(WIN32)
# 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 "")
SET(SDL2_FOUND "YES")
ENDIF(SDL2_LIBRARY_TEMP)
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL2
REQUIRED_VARS SDL2_LIBRARY SDL2_INCLUDE_DIR)
IF(SDL2_STATIC)
if (UNIX AND NOT APPLE)
EXECUTE_PROCESS(COMMAND sdl2-config --static-libs OUTPUT_VARIABLE SDL2_LINK_FLAGS)
STRING(REGEX REPLACE "(\r?\n)+$" "" SDL2_LINK_FLAGS "${SDL2_LINK_FLAGS}")
SET(SDL2_LIBRARY ${SDL2_LINK_FLAGS})
ENDIF()
ENDIF(SDL2_STATIC)

74
cmake/FindSDL_sound.cmake
View File

@ -1,7 +1,7 @@
# - Locates the SDL_sound library
#
# This module depends on SDL being found and
# must be called AFTER FindSDL.cmake is called.
# must be called AFTER FindSDL.cmake or FindSDL2.cmake is called.
#
# This module defines
# SDL_SOUND_INCLUDE_DIR, where to find SDL_sound.h
@ -52,8 +52,8 @@
#
# On OSX, this will prefer the Framework version (if found) over others.
# People will have to manually change the cache values of
# SDL_LIBRARY to override this selectionor set the CMake environment
# CMAKE_INCLUDE_PATH to modify the search paths.
# SDL_LIBRARY or SDL2_LIBRARY to override this selection or set the CMake
# environment CMAKE_INCLUDE_PATH to modify the search paths.
#=============================================================================
# Copyright 2005-2009 Kitware, Inc.
@ -78,27 +78,27 @@ find_path(SDL_SOUND_INCLUDE_DIR SDL_sound.h
ENV SDLSOUNDDIR
ENV SDLDIR
PATH_SUFFIXES SDL SDL12 SDL11
)
)
find_library(SDL_SOUND_LIBRARY
NAMES SDL_sound
HINTS
ENV SDLSOUNDDIR
ENV SDLDIR
)
if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
)
if(SDL2_FOUND OR SDL_FOUND)
if(SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
# CMake is giving me problems using TRY_COMPILE with the CMAKE_FLAGS
# for the :STRING syntax if I have multiple values contained in a
# single variable. This is a problem for the SDL_LIBRARY variable
# single variable. This is a problem for the SDL2_LIBRARY variable
# because it does just that. When I feed this variable to the command,
# only the first value gets the appropriate modifier (e.g. -I) and
# the rest get dropped.
# To get multiple single variables to work, I must separate them with a "\;"
# I could go back and modify the FindSDL.cmake module, but that's kind of painful.
# I could go back and modify the FindSDL2.cmake module, but that's kind of painful.
# The solution would be to try something like:
# set(SDL_TRY_COMPILE_LIBRARY_LIST "${SDL_TRY_COMPILE_LIBRARY_LIST}\;${CMAKE_THREAD_LIBS_INIT}")
# set(SDL2_TRY_COMPILE_LIBRARY_LIST "${SDL2_TRY_COMPILE_LIBRARY_LIST}\;${CMAKE_THREAD_LIBS_INIT}")
# Instead, it was suggested on the mailing list to write a temporary CMakeLists.txt
# with a temporary test project and invoke that with TRY_COMPILE.
# See message thread "Figuring out dependencies for a library in order to build"
@ -108,8 +108,8 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
# ${CMAKE_BINARY_DIR}
# ${PROJECT_SOURCE_DIR}/DetermineSoundLibs.c
# CMAKE_FLAGS
# -DINCLUDE_DIRECTORIES:STRING=${SDL_INCLUDE_DIR}\;${SDL_SOUND_INCLUDE_DIR}
# -DLINK_LIBRARIES:STRING=${SDL_SOUND_LIBRARY}\;${SDL_LIBRARY}
# -DINCLUDE_DIRECTORIES:STRING=${SDL2_INCLUDE_DIR}\;${SDL_SOUND_INCLUDE_DIR}
# -DLINK_LIBRARIES:STRING=${SDL_SOUND_LIBRARY}\;${SDL2_LIBRARY}
# OUTPUT_VARIABLE MY_OUTPUT
# )
@ -140,31 +140,41 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
)
# Calling
# target_link_libraries(DetermineSoundLibs "${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
# causes problems when SDL_LIBRARY looks like
# /Library/Frameworks/SDL.framework;-framework Cocoa
# target_link_libraries(DetermineSoundLibs "${SDL_SOUND_LIBRARY} ${SDL2_LIBRARY})
# causes problems when SDL2_LIBRARY looks like
# /Library/Frameworks/SDL2.framework;-framework Cocoa
# The ;-framework Cocoa seems to be confusing CMake once the OS X
# framework support was added. I was told that breaking up the list
# would fix the problem.
set(TMP_TRY_LIBS)
if(SDL2_FOUND)
foreach(lib ${SDL_SOUND_LIBRARY} ${SDL2_LIBRARY})
set(TMP_TRY_LIBS "${TMP_TRY_LIBS} \"${lib}\"")
endforeach()
set(TMP_INCLUDE_DIRS ${SDL2_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
else()
foreach(lib ${SDL_SOUND_LIBRARY} ${SDL_LIBRARY})
set(TMP_TRY_LIBS "${TMP_TRY_LIBS} \"${lib}\"")
endforeach()
set(TMP_INCLUDE_DIRS ${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
endif()
# message("TMP_TRY_LIBS ${TMP_TRY_LIBS}")
# Write the CMakeLists.txt and test project
# Weird, this is still sketchy. If I don't quote the variables
# in the TARGET_LINK_LIBRARIES, I seem to loose everything
# in the SDL_LIBRARY string after the "-framework".
# in the SDL2_LIBRARY string after the "-framework".
# But if I quote the stuff in INCLUDE_DIRECTORIES, it doesn't work.
file(WRITE ${PROJECT_BINARY_DIR}/CMakeTmp/CMakeLists.txt
"cmake_minimum_required(VERSION 2.8)
project(DetermineSoundLibs C)
include_directories(${SDL_INCLUDE_DIR} ${SDL_SOUND_INCLUDE_DIR})
include_directories(${TMP_INCLUDE_DIRS})
add_executable(DetermineSoundLibs DetermineSoundLibs.c)
target_link_libraries(DetermineSoundLibs ${TMP_TRY_LIBS})"
)
unset(TMP_INCLUDE_DIRS)
unset(TMP_TRY_LIBS)
try_compile(
MY_RESULT
@ -173,12 +183,10 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
DetermineSoundLibs
OUTPUT_VARIABLE MY_OUTPUT
)
# message("${MY_RESULT}")
# message(${MY_OUTPUT})
if(NOT MY_RESULT)
# I expect that MPGLIB, VOC, WAV, AIFF, and SHN are compiled in statically.
# I think Timidity is also compiled in statically.
# I've never had to explcitly link against Quicktime, so I'll skip that for now.
@ -197,8 +205,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(MIKMOD_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MIKMOD_LIBRARY})
@ -217,15 +224,13 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(MODPLUG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${MODPLUG_LIBRARY})
endif()
endif()
# Find Ogg and Vorbis
if("${MY_OUTPUT}" MATCHES "ov_")
find_library(VORBIS_LIBRARY
@ -239,13 +244,11 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(VORBIS_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${VORBIS_LIBRARY})
endif()
find_library(OGG_LIBRARY
NAMES ogg Ogg OGG
PATHS
@ -257,15 +260,13 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(OGG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${OGG_LIBRARY})
endif()
endif()
# Find SMPEG
if("${MY_OUTPUT}" MATCHES "SMPEG_")
find_library(SMPEG_LIBRARY
@ -278,8 +279,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(SMPEG_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SMPEG_LIBRARY})
@ -299,8 +299,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(FLAC_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${FLAC_LIBRARY})
@ -323,8 +322,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
/opt/local
/opt/csw
/opt
PATH_SUFFIXES
lib
PATH_SUFFIXES lib
)
if(SPEEX_LIBRARY)
set(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${SPEEX_LIBRARY})
@ -357,6 +355,7 @@ if(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
else()
set(SDL_SOUND_LIBRARIES ${SDL_SOUND_EXTRAS} ${SDL_SOUND_LIBRARY} CACHE INTERNAL "SDL_sound and dependent libraries")
endif()
endif()
endif()
if(SDL_SOUND_INCLUDE_DIR AND EXISTS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h")
@ -376,7 +375,6 @@ if(SDL_SOUND_INCLUDE_DIR AND EXISTS "${SDL_SOUND_INCLUDE_DIR}/SDL_sound.h")
endif()
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(SDL_sound
REQUIRED_VARS SDL_SOUND_LIBRARY SDL_SOUND_INCLUDE_DIR
REQUIRED_VARS SDL_SOUND_LIBRARIES SDL_SOUND_INCLUDE_DIR
VERSION_VAR SDL_SOUND_VERSION_STRING)

7
examples/alloopback.c
View File

@ -92,13 +92,15 @@ static ALuint CreateSineWave(void)
}
int main()
int main(int argc, char *argv[])
{
PlaybackInfo playback = { NULL, NULL, 0 };
SDL_AudioSpec desired, obtained;
ALuint source, buffer;
ALCint attrs[16];
ALenum state;
(void)argc;
(void)argv;
/* Print out error if extension is missing. */
if(!alcIsExtensionPresent(NULL, "ALC_SOFT_loopback"))
@ -167,6 +169,8 @@ int main()
attrs[6] = 0; /* end of list */
playback.FrameSize = FramesToBytes(1, attrs[1], attrs[3]);
/* Initialize OpenAL loopback device, using our format attributes. */
playback.Device = alcLoopbackOpenDeviceSOFT(NULL);
if(!playback.Device)
@ -187,7 +191,6 @@ int main()
fprintf(stderr, "Failed to set an OpenAL audio context\n");
goto error;
}
playback.FrameSize = FramesToBytes(1, attrs[1], attrs[3]);
/* Start SDL playing. Our callback (thus alcRenderSamplesSOFT) will now
* start being called regularly to update the AL playback state. */