73 lines
2.9 KiB
Groff
73 lines
2.9 KiB
Groff
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.\" $XFree86: xc/programs/Xserver/hw/xfree86/drivers/voodoo/voodoo.man,v 1.0 2004/02/11 23:10:13 alan Exp $
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.\" shorthand for double quote that works everywhere.
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.ds q \N'34'
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.TH VOODOO __drivermansuffix__ __vendorversion__
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.SH NAME
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voodoo \- Voodoo video driver
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.SH SYNOPSIS
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.nf
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.B "Section \*qDevice\*q"
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.BI " Identifier \*q" devname \*q
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.B " Driver \*qvoodoo\*q"
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\ \ ...
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.B EndSection
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.fi
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.SH DESCRIPTION
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.B voodoo
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is an XFree86 driver for Voodoo 1 and Voodoo 2 series video adapters.
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On the Voodoo 1 the driver uses a shadow buffer in system memory as
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the video adapter has only 3D acceleration. Selected portions of the shadow
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framebuffer are copied out to the Voodoo board at the right time. Because
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of this, the speed of the driver is very dependent on the CPU. Processors
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nowadays are actually rather fast at moving data so we get very good speed
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anyway as the shadow framebuffer is in cached RAM.
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.PP
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The Voodoo2 has 16bpp acceleration and the driver provides accelerated
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versions of most operations except angled lines and stipples. Accelerated
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alpha blending with the Render extension is also supported as is DGA.
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.PP
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This driver supports 16bpp modes currently. The video hardware supports
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image conversion from 24bpp to 16bpp but the hardware is 16bpp only.
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.PP
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The Voodoo 1 series cards can go up to 800x600 resolution while the
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Voodoo 2 can reach 1024x768 providing it has at least 2Mb of frame
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buffer memory. 1024x768 2D mode does not require two cards configured in
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scan-line interleave mode (SLI).
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.PP
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Multihead and Xinerama configurations are supported. SLI configurations will
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be treated as multiple video cards.
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.PP
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Limited support for DPMS screen saving is available. The "standby" and
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"suspend" modes are just painting the screen black. The "off" mode turns
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the Voodoo board off and thus works correctly.
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.PP
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This driver does not support a virtual screen size different from the
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display size. This is a hardware limitation. 3D rendering is also not
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supported.
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.SH CONFIGURATION DETAILS
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Please refer to __xconfigfile__(__filemansuffix__) for general configuration
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details. This section only covers configuration details specific to this
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driver.
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.PP
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The following driver
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.B Options
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are supported:
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.TP
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.BI "Option \*qShadowFB\*q \*q" boolean \*q
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Enables a shadow buffer in main memory. This turns off acceleration but for
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otherwise unaccelerated operations can improve performance materially.
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Default: off for voodoo2, on for voodoo1.
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.TP
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.BI "Option \*qNoAccel\*q \*q" boolean \*q
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Disables acceleration if set. Unless debugging this option should only
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be set if ShadowFB is enabled.
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Default: off for voodoo2, on for voodoo1.
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.SH "BUGS"
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The driver interacts badly with the
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sstfb frame buffer driver as there is insufficient information to restore
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the chip to its previous state.
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.SH "SEE ALSO"
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XFree86(1), __xconfigfile__(__filemansuffix__), xf86config(1), Xserver(1), X(__miscmansuffix__)
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.SH AUTHORS
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Authors: Alan Cox, Ghozlane Toumi, Henrik Harmsen.
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