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DOCS/DGA
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@ -23,17 +23,18 @@ Contents
2. What is DGA?
~~~~~~~~~~~~~~~
DGA is short for Direct Graphics Access and is a means for a programm to
DGA is short for Direct Graphics Access and is a means for a program to
bypass the X-Server and directly modifying the framebuffer memory.
Technically spoken this happens by mapping the framebuffer memory into
the memory range of your process. This is just allowed by the kernel
the memory range of your process. This is allowed by the kernel only
if you have superuser privileges. You can get these either by logging in
as root or by setting the suid bit on the mplayer excecutable.
as root or by setting the suid bit on the mplayer excecutable (NOT
recommended!).
There are two versions of DGA: DGA1 is used by XFree 3.X.X and DGA2 was
There are two versions of DGA: DGA1 is used by XFree 3.x.x and DGA2 was
introduced with XFree 4.0.1.
DGA1 just provides direct framebuffer access as described above. For
DGA1 provides only direct framebuffer access as described above. For
switching the resolution of the video signal you have to rely on the
XVidMode extension.
@ -57,12 +58,12 @@ Contents
/etc/X11/XF86Config (/etc/X11/XF86Config-4 for XFree 4.0.X respectively).
Those are defined by so-called modelines and depend on the capabilites
of your video hardware. The XServer scans this config file on startup and
disables those modelines not suitable for your hardware. You can find
disables the modelines not suitable for your hardware. You can find
out which modes survive with the X11 log file. It can be found at:
/var/log/XFree86.0.log (on Debian systems ... :-) )
/var/log/XFree86.0.log
See appendix A for some sample modeline definitions.
4. DGA & MPLayer
4. DGA & MPlayer
~~~~~~~~~~~~~~~~
DGA is used in two places with MPlayer: The SDL driver can be made to make