diff options
Diffstat (limited to 'DOCS/DGA')
| -rw-r--r-- | DOCS/DGA | 26 |
1 files changed, 15 insertions, 11 deletions
@@ -23,17 +23,18 @@ Contents 2. What is DGA? ~~~~~~~~~~~~~~~ - DGA is short for Direct Graphics Access and is a mean for a program to - bypass the X-Server and directly modifying the framebuffer memory. + DGA is short for Direct Graphics Access and is a method for a program to + bypass the X-Server and directly modify 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 only allowed by the kernel if you have superuser privileges. You can get these either by logging in - as root or by setting the suid bit on the mplayer executable. + as root or by setting the suid bit on the mplayer executable (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 the 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 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 @@ -107,12 +108,15 @@ A. Sample modelines ~~~~~~~~~~~~~~~~~~~ Section "Modes" Identifier "Modes[0]" - Modeline "712x600" 35.0 712 740 850 900 400 410 412 425 - Modeline "640x480" 25.175 640 664 760 800 480 491 493 525 - Modeline "352x240" 15.750 352 368 416 432 240 244 246 262 Doublescan # 800x600 @ 60 Hz, 37.8 kHz hsync Modeline "800x600" 40 800 840 968 1056 600 601 605 628 + Modeline "712x600" 35.0 712 740 850 900 400 410 412 425 + Modeline "640x480" 25.175 640 664 760 800 480 491 493 525 + Modeline "400x300" 20 400 416 480 528 300 301 303 314 Doublescan Modeline "352x288" 25.10 352 368 416 432 288 296 290 310 + Modeline "352x240" 15.750 352 368 416 432 240 244 246 262 Doublescan + Modeline "320x240" 12.588 320 336 384 400 240 245 246 262 Doublescan + EndSection |