Mercurial > sdl-ios-xcode
annotate test/acinclude.m4 @ 4139:568c9b3c0167 SDL-1.2
* Added configure option --enable-screensaver, to allow enabling the screensaver by default.
* Use XResetScreenSaver() instead of disabling screensaver entirely.
Full discussion summary from Erik on the SDL mailing list:
Current behaviour
=================
SDL changes the user's display power management settings without
permission from the user and without telling the user.
The interface that it uses to do so is DPMSDisable/DPMSEnable, which
should only ever be used by configuration utilities like KControl, never
by normal application programs, let alone by the libraries that they
use. Using an interface that is not at all intended for what SDL tries
to achieve means that it will not work as it should. Firstly, the power
management is completely disabled during the whole lifetime of the SDL
program, not only when it should be. Secondly, it makes SDL
non-reentrant, meaning that things will break when multiple SDL programs
are clients of the same X server simultaneously. Thirdly, no cleanup
mechanism ensures that the setting is restored if the client does not do
that (for example if it crashes).
In addition to that, this interface is broken on xorg,
[http://bugs.freedesktop.org/show_bug.cgi?id=13962], so what SDL tries
to do does not work at all on that implementation of the X Window
System. (The reason that the DPMSEnable works in KControl is that it
calls DPMSSetTimeout immediately after,
[http://websvn.kde.org/tags/KDE/3.5.9/kdebase/kcontrol/energy/energy.cpp?annotate=774532#l343]).
The problems that the current behaviour causes
==============================================
1. Information leak. When the user is away, someone might see what the
user has on the display when the user counts on the screensaver
preventing this. This does not even require physical access to the
workstation, it is enough to see it from a distance.
2. Draining battery. An SDL program that runs on a laptop will quickly
drain the battery while the user is away. The system will soon shut down
and require recharging before being usable again, while it should in
fact have consumed very little energy if the user's settings would have
been obeyed.
3. Wasting energy. Even if battery issues are not considered, energy as
such is wasted.
4. Display wear. The display may be worn out.
The problems that the current behaviour tries to solve
======================================================
1. Preventing screensaver while playing movies.
Many SDL applications are media players. They have reasons to prevent
screensavers from being activated while a movie is being played. When a
user clicks on the play button it can be interpreted as saying "play
this movie, but do not turn off the display while playing it, because I
will watch it even though I do not interact with the system".
2. Preventing screensaver when some input bypasses X.
Sometimes SDL uses input from another source than the X server, so
that the X server is bypassed. This obviously breaks the screensaver
handling. SDL tries to work around that.
3. Preventing screensaver when all input bypasses X.
There is something called Direct Graphics Access mode, where a
program takes control of both the display and the input devices from the
X server. This obviously means that the X server can not handle the
screensaver alone, since screensaver handling depends on input handling.
SDL does not do what it should to help the X server to handle the
screensaver. Nor does SDL take care of screeensaver handling itself. SDL
simply disables the screensaver completely.
How the problems should be solved
=================================
The correct way for an application program to prevent the screensaver
under X is to call XResetScreenSaver. This was recently discovered and
implemented by the mplayer developers,
[http://svn.mplayerhq.hu/mplayer?view=rev&revision=25637]. SDL needs to
wrap this in an API call (SDL_ResetScreenSaver) and implement it for the
other video targets (if they do not have a corresponding call, SDL
should do what it takes on that particular target, for example sending
fake key events).
1. When a movie is played, the player should reset the screensaver when
the animation is advanced to a new frame. The same applies to anything
similar, like slideshows.
2. When the X server is handling input, it must handle all input
(keyboards, mice, gamepads, ...). This is necessary, not only to be able
to handle the screensaver, but also so that it can send the events to
the correct (the currently active) client. If there is an input device
that the X server can not handle for some reason (such as lack of Plug
and Play capability), the program that handles the device as a
workaround must simulate what would happen if the X server would have
handled the device, by calling XResetScreenSaver when input is received
from the device.
3. When the X server is not handling the input, it depends on the
program that does to call XResetScreenSaver whenever an input event
occurs. Alternatively the program must handle the screensaver countdown
internally and call XActivateScreenSaver.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 29 Feb 2008 13:55:44 +0000 |
| parents | 91063c450171 |
| children |
| rev | line source |
|---|---|
| 0 | 1 # Configure paths for SDL |
| 2 # Sam Lantinga 9/21/99 | |
| 3 # stolen from Manish Singh | |
| 4 # stolen back from Frank Belew | |
| 5 # stolen from Manish Singh | |
| 6 # Shamelessly stolen from Owen Taylor | |
| 7 | |
| 8 dnl AM_PATH_SDL([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]]) | |
| 9 dnl Test for SDL, and define SDL_CFLAGS and SDL_LIBS | |
| 10 dnl | |
|
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11 AC_DEFUN([AM_PATH_SDL], |
| 0 | 12 [dnl |
| 13 dnl Get the cflags and libraries from the sdl-config script | |
| 14 dnl | |
| 15 AC_ARG_WITH(sdl-prefix,[ --with-sdl-prefix=PFX Prefix where SDL is installed (optional)], | |
| 16 sdl_prefix="$withval", sdl_prefix="") | |
| 17 AC_ARG_WITH(sdl-exec-prefix,[ --with-sdl-exec-prefix=PFX Exec prefix where SDL is installed (optional)], | |
| 18 sdl_exec_prefix="$withval", sdl_exec_prefix="") | |
| 19 AC_ARG_ENABLE(sdltest, [ --disable-sdltest Do not try to compile and run a test SDL program], | |
| 20 , enable_sdltest=yes) | |
| 21 | |
| 22 if test x$sdl_exec_prefix != x ; then | |
|
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23 sdl_args="$sdl_args --exec-prefix=$sdl_exec_prefix" |
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24 if test x${SDL_CONFIG+set} != xset ; then |
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25 SDL_CONFIG=$sdl_exec_prefix/bin/sdl-config |
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26 fi |
| 0 | 27 fi |
| 28 if test x$sdl_prefix != x ; then | |
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29 sdl_args="$sdl_args --prefix=$sdl_prefix" |
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30 if test x${SDL_CONFIG+set} != xset ; then |
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31 SDL_CONFIG=$sdl_prefix/bin/sdl-config |
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32 fi |
| 0 | 33 fi |
| 34 | |
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35 if test "x$prefix" != xNONE; then |
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36 PATH="$prefix/bin:$prefix/usr/bin:$PATH" |
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37 fi |
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38 AC_PATH_PROG(SDL_CONFIG, sdl-config, no, [$PATH]) |
| 0 | 39 min_sdl_version=ifelse([$1], ,0.11.0,$1) |
| 40 AC_MSG_CHECKING(for SDL - version >= $min_sdl_version) | |
| 41 no_sdl="" | |
| 42 if test "$SDL_CONFIG" = "no" ; then | |
| 43 no_sdl=yes | |
| 44 else | |
| 45 SDL_CFLAGS=`$SDL_CONFIG $sdlconf_args --cflags` | |
| 46 SDL_LIBS=`$SDL_CONFIG $sdlconf_args --libs` | |
| 47 | |
| 48 sdl_major_version=`$SDL_CONFIG $sdl_args --version | \ | |
| 49 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'` | |
| 50 sdl_minor_version=`$SDL_CONFIG $sdl_args --version | \ | |
| 51 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'` | |
| 52 sdl_micro_version=`$SDL_CONFIG $sdl_config_args --version | \ | |
| 53 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'` | |
| 54 if test "x$enable_sdltest" = "xyes" ; then | |
| 55 ac_save_CFLAGS="$CFLAGS" | |
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56 ac_save_CXXFLAGS="$CXXFLAGS" |
| 0 | 57 ac_save_LIBS="$LIBS" |
| 58 CFLAGS="$CFLAGS $SDL_CFLAGS" | |
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59 CXXFLAGS="$CXXFLAGS $SDL_CFLAGS" |
| 0 | 60 LIBS="$LIBS $SDL_LIBS" |
| 61 dnl | |
| 62 dnl Now check if the installed SDL is sufficiently new. (Also sanity | |
| 63 dnl checks the results of sdl-config to some extent | |
| 64 dnl | |
| 65 rm -f conf.sdltest | |
| 66 AC_TRY_RUN([ | |
| 67 #include <stdio.h> | |
| 68 #include <stdlib.h> | |
| 69 #include <string.h> | |
| 70 #include "SDL.h" | |
| 71 | |
| 72 char* | |
| 73 my_strdup (char *str) | |
| 74 { | |
| 75 char *new_str; | |
| 76 | |
| 77 if (str) | |
| 78 { | |
| 79 new_str = (char *)malloc ((strlen (str) + 1) * sizeof(char)); | |
| 80 strcpy (new_str, str); | |
| 81 } | |
| 82 else | |
| 83 new_str = NULL; | |
| 84 | |
| 85 return new_str; | |
| 86 } | |
| 87 | |
| 88 int main (int argc, char *argv[]) | |
| 89 { | |
| 90 int major, minor, micro; | |
| 91 char *tmp_version; | |
| 92 | |
| 93 /* This hangs on some systems (?) | |
| 94 system ("touch conf.sdltest"); | |
| 95 */ | |
| 96 { FILE *fp = fopen("conf.sdltest", "a"); if ( fp ) fclose(fp); } | |
| 97 | |
| 98 /* HP/UX 9 (%@#!) writes to sscanf strings */ | |
| 99 tmp_version = my_strdup("$min_sdl_version"); | |
| 100 if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, µ) != 3) { | |
| 101 printf("%s, bad version string\n", "$min_sdl_version"); | |
| 102 exit(1); | |
| 103 } | |
| 104 | |
| 105 if (($sdl_major_version > major) || | |
| 106 (($sdl_major_version == major) && ($sdl_minor_version > minor)) || | |
| 107 (($sdl_major_version == major) && ($sdl_minor_version == minor) && ($sdl_micro_version >= micro))) | |
| 108 { | |
| 109 return 0; | |
| 110 } | |
| 111 else | |
| 112 { | |
| 113 printf("\n*** 'sdl-config --version' returned %d.%d.%d, but the minimum version\n", $sdl_major_version, $sdl_minor_version, $sdl_micro_version); | |
| 114 printf("*** of SDL required is %d.%d.%d. If sdl-config is correct, then it is\n", major, minor, micro); | |
| 115 printf("*** best to upgrade to the required version.\n"); | |
| 116 printf("*** If sdl-config was wrong, set the environment variable SDL_CONFIG\n"); | |
| 117 printf("*** to point to the correct copy of sdl-config, and remove the file\n"); | |
| 118 printf("*** config.cache before re-running configure\n"); | |
| 119 return 1; | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 ],, no_sdl=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"]) | |
| 124 CFLAGS="$ac_save_CFLAGS" | |
| 1550 | 125 CXXFLAGS="$ac_save_CXXFLAGS" |
| 0 | 126 LIBS="$ac_save_LIBS" |
| 127 fi | |
| 128 fi | |
| 129 if test "x$no_sdl" = x ; then | |
| 130 AC_MSG_RESULT(yes) | |
| 131 ifelse([$2], , :, [$2]) | |
| 132 else | |
| 133 AC_MSG_RESULT(no) | |
| 134 if test "$SDL_CONFIG" = "no" ; then | |
| 135 echo "*** The sdl-config script installed by SDL could not be found" | |
| 136 echo "*** If SDL was installed in PREFIX, make sure PREFIX/bin is in" | |
| 137 echo "*** your path, or set the SDL_CONFIG environment variable to the" | |
| 138 echo "*** full path to sdl-config." | |
| 139 else | |
| 140 if test -f conf.sdltest ; then | |
| 141 : | |
| 142 else | |
| 143 echo "*** Could not run SDL test program, checking why..." | |
| 144 CFLAGS="$CFLAGS $SDL_CFLAGS" | |
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145 CXXFLAGS="$CXXFLAGS $SDL_CFLAGS" |
| 0 | 146 LIBS="$LIBS $SDL_LIBS" |
| 147 AC_TRY_LINK([ | |
| 148 #include <stdio.h> | |
| 149 #include "SDL.h" | |
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150 |
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151 int main(int argc, char *argv[]) |
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152 { return 0; } |
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153 #undef main |
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154 #define main K_and_R_C_main |
| 0 | 155 ], [ return 0; ], |
| 156 [ echo "*** The test program compiled, but did not run. This usually means" | |
| 157 echo "*** that the run-time linker is not finding SDL or finding the wrong" | |
| 158 echo "*** version of SDL. If it is not finding SDL, you'll need to set your" | |
| 159 echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point" | |
| 160 echo "*** to the installed location Also, make sure you have run ldconfig if that" | |
| 161 echo "*** is required on your system" | |
| 162 echo "***" | |
| 163 echo "*** If you have an old version installed, it is best to remove it, although" | |
| 164 echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"], | |
| 165 [ echo "*** The test program failed to compile or link. See the file config.log for the" | |
| 166 echo "*** exact error that occured. This usually means SDL was incorrectly installed" | |
| 167 echo "*** or that you have moved SDL since it was installed. In the latter case, you" | |
| 168 echo "*** may want to edit the sdl-config script: $SDL_CONFIG" ]) | |
| 169 CFLAGS="$ac_save_CFLAGS" | |
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170 CXXFLAGS="$ac_save_CXXFLAGS" |
| 0 | 171 LIBS="$ac_save_LIBS" |
| 172 fi | |
| 173 fi | |
| 174 SDL_CFLAGS="" | |
| 175 SDL_LIBS="" | |
| 176 ifelse([$3], , :, [$3]) | |
| 177 fi | |
| 178 AC_SUBST(SDL_CFLAGS) | |
| 179 AC_SUBST(SDL_LIBS) | |
| 180 rm -f conf.sdltest | |
| 181 ]) |