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voodoo - Voodoo video driver
voodoo is an Xorg driver for Voodoo 1 and Voodoo 2 series video
adapters. On the Voodoo 1 the driver uses a shadow buffer in system memory
as the video adapter has only 3D acceleration. Selected portions of the
shadow framebuffer are copied out to the Voodoo board at the right time.
Because of this, the speed of the driver is very dependent on the CPU.
Processors nowadays are actually rather fast at moving data so we get
very good speed anyway as the shadow framebuffer is in cached RAM.
Voodoo2 has 16bpp acceleration and the driver provides accelerated versions
of most operations except angled lines and stipples. Accelerated alpha blending
with the Render extension is also supported as is DGA.
This driver supports
16bpp modes currently. The video hardware supports image conversion from
24bpp to 16bpp but the hardware is 16bpp only.
The Voodoo 1 series cards
can go up to 800x600 resolution while the Voodoo 2 can reach 1024x768 providing
it has at least 2Mb of frame buffer memory. 1024x768 2D mode does not require
two cards configured in scan-line interleave mode (SLI).
Multihead and Xinerama
configurations are supported. SLI configurations will be treated as multiple
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. This is a hardware
limitation. 3D rendering is also not supported.
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:
The driver interacts badly
with the sstfb frame buffer driver as there is insufficient information
to restore the chip to its previous state.
Authors: Alan Cox, Ghozlane Toumi, Henrik Harmsen.
- Option "ShadowFB" "boolean"
- Enables a shadow buffer
in main memory. This turns off acceleration but for otherwise unaccelerated
operations can improve performance materially. Default: off for voodoo2,
on for voodoo1.
- Option "NoAccel" "boolean"
- Disables acceleration if set.
Unless debugging this option should only be set if ShadowFB is enabled.
Default: off for voodoo2, on for voodoo1.
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