/
sdlenvvars.html
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sdlenvvars.html
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<HTML
><HEAD
><TITLE
>SDL_envvars</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
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HREF="general.html"><LINK
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HREF="video.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="3"
ALIGN="center"
>SDL Library Documentation</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
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><A
HREF="sdlgeterror.html"
ACCESSKEY="P"
>Prev</A
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><TD
WIDTH="80%"
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><A
HREF="video.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="SDLENVVARS"
></A
>SDL_envvars</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN675"
></A
><H2
>Name</H2
>SDL_envvars -- SDL environment variables</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN678"
></A
><H2
>Description</H2
><P
>Not a function, set using setenv()</P
><P
>Several environment variables are available to modify the
behaviour of SDL. Using these variables isn't recommened and the names
and presence of these variables aren't guaranteed from one release to
the next. However, they can be very useful for debugging
purposes.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN682"
></A
><H2
>Video</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>SDL_FBACCEL</TT
></DT
><DD
><P
>If set to 0, disable hardware acceleration in the linux fbcon driver.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_FBDEV</TT
></DT
><DD
><P
>Frame buffer device to use in the linux fbcon driver, instead of /dev/fb0</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_FULLSCREEN_UPDATE</TT
></DT
><DD
><P
>In the ps2gs driver, sets the <TT
CLASS="LITERAL"
>SDL_ASYNCBLIT</TT
> flag on the
display surface.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEODRIVER</TT
></DT
><DD
><P
>Selectes the video driver for SDL to use. Possible values, in the
order they are tried if this variable is not set:</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN706"
></A
><P
></P
><TABLE
BORDER="0"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>x11</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
></P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>dga</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(the XFree86 DGA2)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>nanox</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Linux)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>fbcon</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Linux)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>directfb</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Linux)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>ps2gs</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Playstation 2)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>ggi</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
></P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>vgl</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(BSD)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>svgalib</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Linux)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>aalib</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
></P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>directx</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Win32)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>windib</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Win32)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>bwindow</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(BeOS)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>toolbox</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(MacOS Classic)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>DSp</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(MacOS Classic)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>Quartz</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Mac OS X)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>CGX</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Amiga)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>photon</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(QNX)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>dummy</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
></P
></TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_CENTERED</TT
></DT
><DD
><P
>If set, tries to center the SDL window when running in X11 windowed
mode, or using the CyberGrafix driver.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_GL_DRIVER</TT
></DT
><DD
><P
>The openGL driver (shared library) to use for X11. Default is libGL.so.1</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_X11_DGAMOUSE</TT
></DT
><DD
><P
>With XFree86, enables use of DGA mouse if set.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_X11_MOUSEACCEL</TT
></DT
><DD
><P
>For X11, sets the mouse acceleration. The value should be a string
on the form:</P
><P
>"<TT
CLASS="PARAMETER"
><I
>n</I
></TT
>/<TT
CLASS="PARAMETER"
><I
>d</I
></TT
>/<TT
CLASS="PARAMETER"
><I
>t</I
></TT
>"</P
><P
>where <TT
CLASS="PARAMETER"
><I
>n</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>d</I
></TT
> are the
acceleration numerator/denumerators (so mouse movement is accelerated by
<TT
CLASS="PARAMETER"
><I
>n</I
></TT
>/<TT
CLASS="PARAMETER"
><I
>d</I
></TT
>), and
<TT
CLASS="PARAMETER"
><I
>t</I
></TT
> is the threshold above which acceleration applies
(counted as number of pixels the mouse moves at once).</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_X11_NODIRECTCOLOR</TT
></DT
><DD
><P
>If set, don't attempt to use DirectColor visuals even if they are
present. (SDL will use them otherwise for gamma correction).
This is needed with older X servers when using the XVideo extension.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_X11_VISUALID</TT
></DT
><DD
><P
>ID of an X11 visual to use, overriding SDL's default visual selection
algorithm. It can be in decimal or in hex (prefixed by 0x).</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_YUV_DIRECT</TT
></DT
><DD
><P
>If set, display YUV overlay directly on the video surface if possible,
instead of on the surface passed to
<A
HREF="sdlcreateyuvoverlay.html"
><TT
CLASS="FUNCTION"
>SDL_CreateYUVOverlay</TT
></A
>.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_VIDEO_YUV_HWACCEL</TT
></DT
><DD
><P
>If not set or set to a nonzero value, SDL will attempt to use
hardware YUV acceleration for video playback.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_WINDOWID</TT
></DT
><DD
><P
>For X11 or Win32, contains the ID number of the window to be used by
SDL instead of creating its own window. Either in decimal or
in hex (prefixed by 0x).</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN866"
></A
><H2
>Events/Input</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>SDL_MOUSE_RELATIVE</TT
></DT
><DD
><P
>If set to 0, do not use mouse relative mode in X11. The default is
to use it if the mouse is hidden and input is grabbed.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_MOUSEDEV</TT
></DT
><DD
><P
>The mouse device to use for the linux fbcon driver. If not set,
SDL first tries to use GPM in repeater mode, then various other
devices (/dev/pcaux, /dev/adbmouse, /dev/mouse etc).</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_MOUSEDEV_IMPS2</TT
></DT
><DD
><P
>If set, SDL will not try to auto-detect the IMPS/2 protocol of
a PS/2 mouse but use it right away. For the fbcon and ps2gs drivers.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_MOUSEDRV</TT
></DT
><DD
><P
>For the linux fbcon driver: if set to ELO, use the ELO touchscreen
controller as a pointer device</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_NO_RAWKBD</TT
></DT
><DD
><P
>For the libvga driver: If set, do not attempt to put the keyboard in raw mode.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_NOMOUSE</TT
></DT
><DD
><P
>If set, the linux fbcon driver will not use a mouse at all.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_NO_LOCK_KEYS</TT
></DT
><DD
><P
>Disable CAPS-LOCK and NUM-LOCK suppression of down+up key events,
suitable for games where the player needs these keys to do more than just toggle.
A value of 1 will effect both CAPS-LOCK and NUM-LOCK.
A value of 2 will effect only CAPS-LOCK.
A value of 3 will effect only NUM-LOCK.
All other values have no effect.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN899"
></A
><H2
>Audio</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>AUDIODEV</TT
></DT
><DD
><P
>The audio device to use, if <TT
CLASS="LITERAL"
>SDL_PATH_DSP</TT
> isn't set.</P
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_AUDIODRIVER</TT
></DT
><DD
><P
>Selects the audio driver for SDL to use. Possible values, in the
order they are tried if this variable is not set:</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN913"
></A
><P
></P
><TABLE
BORDER="0"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>openbsd</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(OpenBSD)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>dsp</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(OSS /dev/dsp: Linux, Solaris, BSD etc)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>alsa</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Linux)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>pulse</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(PulseAudio daemon)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>audio</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Unix style /dev/audio: SunOS, Solaris etc)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>AL</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Irix)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>artsc</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(ARTS audio daemon)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>esd</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(esound audio daemon)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>nas</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(NAS audio daemon)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>dma</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(OSS /dev/dsp, using DMA)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>dsound</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Win32 DirectX)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>waveout</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Win32 WaveOut)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>baudio</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(BeOS)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>sndmgr</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(MacOS SoundManager)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>paud</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(AIX)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>AHI</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(Amiga)</P
></TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>disk</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
><P
>(all; output to file)</P
></TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DD
><DT
><TT
CLASS="LITERAL"
>SDL_DISKAUDIOFILE</TT
></DT