Provided by: xserver-xorg-video-glide_1.2.2-2_amd64 
NAME
glide - Glide video driver
SYNOPSIS
Section "Device"
Identifier "devname"
Driver "glide"
...
EndSection
DESCRIPTION
glide is an Xorg driver for Glide capable video boards (such as 3Dfx Voodoo boards). This driver is
mainly for Voodoo 1 and Voodoo 2 boards, later boards from 3Dfx have 2D built-in and you should
preferably use a driver separate for those boards or the fbdev(4) driver. This driver is a bit special
because Voodoo 1 and 2 boards are very much NOT made for running 2D graphics. Therefore, this driver uses
no hardware acceleration (since there is no acceleration for 2D, only 3D). Instead it is implemented with
the help of a "shadow" framebuffer that resides entirely in RAM. Selected portions of this shadow
framebuffer are then copied out to the Voodoo board at the right time. Because of this, the speed of the
driver is very dependent on the CPU. But since the CPU is nowadays actually rather fast at moving data,
we get very good speed anyway, especially since the whole shadow framebuffer is in cached RAM.
This driver supports 16 and 24 bit color modes. The 24 bit color mode uses a 32 bit framebuffer (it has
no support for 24 bit packed-pixel framebuffers). Notice that the Voodoo boards can only display 16 bit
color, but the shadow framebuffer can be run in 24 bit color. The point of supporting 24 bit mode is that
this enables you to run in a multihead configuration with Xinerama together with another board that runs
in real 24 bit color mode. (All boards must run the same color depth when you use Xinerama).
Resolutions supported are: 640x480, 800x600, 960x720, 1024x768, 1280x1024 and 1600x1200. Note that not
all modes will work on all Voodoo boards. It seems that Voodoo 2 boards support no higher than 1024x768
and Voodoo 1 boards can go to 800x600. If you see a message like this in the output from the server:
(EE) GLIDE(0): grSstWinOpen returned ...
Then you are probably trying to use a resolution that is supported by the driver but not supported by the
hardware.
Refresh rates supported are: 60Hz, 75Hz and 85Hz. The refresh rate used is derived from the normal mode
line according to the following table:
Mode-line refresh rate Used refresh rate
0-74 Hz
60 Hz
74-84 Hz
75 Hz
84- Hz
85 Hz
Thus, if you use a modeline that for example has a 70Hz refresh rate you will only get a 60Hz refresh
rate in actuality.
Selecting which Voodoo board to use with the driver is done by using an option called "GlideDevice" in
the "Device" section. (If you don't have this option present then the first board found will be selected
for that Device section). For example: To use the first Voodoo board, use a "Device" section like this,
for example:
Section "Device"
Identifier "Voodoo"
Driver "glide"
Option "dpms" "on"
Option "GlideDevice" "0"
EndSection
And if you have more than one Voodoo board, add another "Device" section with a GlideDevice option with
value 1, and so on. (You can use more than one Voodoo board, but SLI configured boards will be treated as
a single board.)
Multihead and Xinerama configurations are supported.
Limited support for DPMS screen saving is available. The "standby" and "suspend" modes are just painting
the screen black. The "off" mode turns the Voodoo board off and thus works correctly.
This driver does not support a virtual screen size different from the display size.
SUPPORTED HARDWARE
The glide driver supports any board that can be used with Glide (such as 3Dfx Voodoo boards)
CONFIGURATION DETAILS
Please refer to xorg.conf(5) for general configuration details. This section only covers configuration
details specific to this driver.
The following driver Options are supported:
Option "OnAtExit" "boolean"
If true, will leave the Voodoo board on when the server exits. Useful in a multihead setup when
only the Voodoo board is connected to a second monitor and you don't want that monitor to lose
signal when you quit the server. Put this option in the Device section. Default: off.
Option "GlideDevice" "integer"
Selects which Voodoo board to use. (Or boards, in an SLI configuration). The value should be 0
for the first board, 1 for the second and so on. If it is not present, the first Voodoo board
found will be selected. Put this option in the Device section.
EXAMPLE
Here is an example of a part of an xorg.conf file that uses a multihead configuration with two monitors.
The first monitor is driven by the fbdev video driver and the second monitor is driven by the glide
driver.
Section "Monitor"
Identifier "Monitor 1"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30-70
VertRefresh 50-80
# 1024x768 @ 76 Hz, 62.5 kHz hsync
Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823
EndSection
Section "Monitor"
Identifier "Monitor 2"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 30-70
VertRefresh 50-80
# 1024x768 @ 76 Hz, 62.5 kHz hsync
Modeline "1024x768" 85 1024 1032 1152 1360 768 784 787 823
EndSection
Section "Device"
Identifier "fb"
Driver "fbdev"
Option "shadowfb"
Option "dpms" "on"
# My video card is on the AGP bus which is usually
# located as PCI bus 1, device 0, function 0.
BusID "PCI:1:0:0"
EndSection
Section "Device"
# I have a Voodoo 2 board
Identifier "Voodoo"
Driver "glide"
Option "dpms" "on"
# The next line says I want to use the first board.
Option "GlideDevice" "0"
EndSection
Section "Screen"
Identifier "Screen 1"
Device "fb"
Monitor "Monitor 1"
DefaultDepth 16
Subsection "Display"
Depth 16
Modes "1024x768"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen 2"
Device "Voodoo"
Monitor "Monitor 2"
DefaultDepth 16
Subsection "Display"
Depth 16
Modes "1024x768"
EndSubSection
EndSection
Section "ServerLayout"
Identifier "Main Layout"
# Screen 1 is to the right and screen 2 is to the left
Screen "Screen 2"
Screen "Screen 1" "" "" "Screen 2" ""
EndSection
If you use this configuration file and start the server with the +xinerama command line option, the two
monitors will be showing a single large area where windows can be moved between monitors and overlap from
one monitor to the other. Starting the X server with the Xinerama extension can be done for example like
this:
$ xinit -- +xinerama
FILES
glide_drv.o
SEE ALSO
Xorg(1), xorg.conf(5), Xserver(1), X(7)
AUTHORS
Author: Henrik Harmsen.
X Version 11 xf86-video-glide 1.2.2 GLIDE(4)