1VOODOO(4)                  Kernel Interfaces Manual                  VOODOO(4)
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NAME

6       voodoo - Voodoo video driver
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SYNOPSIS

9       Section "Device"
10         Identifier "devname"
11         Driver "voodoo"
12         ...
13       EndSection
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DESCRIPTION

16       voodoo  is  an  XFree86  driver  for Voodoo 1 and Voodoo 2 series video
17       adapters.  On the Voodoo 1 the driver uses a shadow  buffer  in  system
18       memory as the video adapter has only 3D acceleration. Selected portions
19       of the shadow framebuffer are copied out to the  Voodoo  board  at  the
20       right  time. Because of this, the speed of the driver is very dependent
21       on the CPU. Processors nowdays are actually rather fast at moving  data
22       so we get very good speed anyway as the shadow framebuffer is in cached
23       RAM.
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25       The Voodoo2 has 16bpp acceleration and the driver provides  accelerated
26       versions  of most operations except angled lines and stipples. Acceler‐
27       ated alpha blending with the Render extension is also supported  as  is
28       DGA.
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30       This driver supports 16bpp modes currently. The video hardware supports
31       image conversion from 24bpp to 16bpp but the hardware is 16bpp only.
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33       The Voodoo 1 series cards can go up to  800x600  resolution  while  the
34       Voodoo 2 can reach 1024x768 providing it has at least 2Mb of frame buf‐
35       fer memory. 1024x768 2D mode does not require two cards  configured  in
36       scan-line interleave mode (SLI).
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38       Multihead and Xinerama configurations are supported. SLI configurations
39       will be treated as multiple video cards.
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41       Limited support for DPMS screen saving is available. The "standby"  and
42       "suspend"  modes  are  just  painting  the screen black. The "off" mode
43       turns the Voodoo board off and thus works correctly.
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45       This driver does not support a virtual screen size different  from  the
46       display  size.  This is a hardware limitation. 3D rendering is also not
47       supported.
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CONFIGURATION DETAILS

50       Please refer to xorg.conf(5x) for general configuration details.   This
51       section only covers configuration details specific to this driver.
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53       The following driver Options are supported:
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55       Option "ShadowFB" "boolean"
56              Enables a shadow buffer in main memory. This turns off accelera‐
57              tion but for otherwise unaccelerated operations can improve per‐
58              formance materially.  Default: off for voodoo2, on for voodoo1.
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60       Option "NoAccel" "boolean"
61              Disables  acceleration  if  set.  Unless  debugging  this option
62              should only be set if ShadowFB is  enabled.   Default:  off  for
63              voodoo2, on for voodoo1.
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BUGS

66       The  driver interacts badly with the sstfb frame buffer driver as there
67       is insufficient information to restore the chip to its previous state.
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SEE ALSO

70       XFree86(1), xorg.conf(5x), xf86config(1), Xserver(1), X(7)
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AUTHORS

73       Authors: Alan Cox, Ghozlane Toumi, Henrik Harmsen.
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77X Version 11                xf86-video-voodoo 1.1.0                  VOODOO(4)
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