806353ec9e
Tilting allows using left/right rotated or invetrted display orientation. This can be changed at runtime such as: echo tilt right > /dev/vgactl This removes the old panning and vga overlays as they are only implemented with some ancient vga controllers.
215 lines
3.7 KiB
Text
215 lines
3.7 KiB
Text
.TH VGA 3
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.SH NAME
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vga \- VGA controller device
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.SH SYNOPSIS
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.nf
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.B bind #v /dev
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.B /dev/vgactl
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.fi
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.SH DESCRIPTION
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The VGA device allows configuration of a graphics controller
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on a PC.
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.B Vgactl
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allows control over higher-level settings such as display height, width, depth,
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controller and hardware-cursor type.
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Along with the I/O-port registers
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provided by
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.IR arch (3),
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it is used to implement configuration and setup of VGA controller cards.
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This is usually performed by
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.IR vga (8).
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.PP
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Writing strings to
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.B vgactl
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configures the VGA device.
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The following are valid commands.
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.TP
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.BI size " X" x Y x "Z chan"
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Set the size of the screen image to be
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.I X
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pixels wide
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and
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.I Y
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pixels high.
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Each pixel is
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.I Z
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bits as specified by
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.IR chan ,
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whose format is described in
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.IR image (6).
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.TP
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.BI actualsize " X" x Y
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Set the physical size of the display to be
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.I X
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pixels wide by
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.I Y
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pixels high.
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This message is optional;
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it is used to accommodate displays that require the
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in-memory screen image to have certain alignment properties.
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For example, a 1400x1050 screen with a 1408x1050 in-memory image
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will use
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.B "size 1408x1050
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but
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.BR "actualsize 1400x1050" .
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.TP
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.BI tilt " value"
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Set the tilt of the screen,
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altering the screen's orientation.
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The
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.I value
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can be one of:
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.BR none ,
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.BR left ,
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.B inverted
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and
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.BR right .
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.TP
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.BI type " ctlr"
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Set the type of VGA controller being used.
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.I Ctlr
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is one of
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.BR 3dfx ,
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.BR ark200pv ,
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.BR clgd542x ,
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.BR clgd546x ,
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.BR ct65545 ,
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.BR cyber938x ,
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.BR et4000 ,
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.BR geode ,
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.BR hiqvideo ,
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.BR i81x ,
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.BR igfx ,
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.BR mach64xx ,
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.BR mga2164w ,
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.BR mga4xx ,
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.BR neomagic ,
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.BR nvidia ,
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.BR radeon ,
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.BR s3 ,
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.BR t2r4
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and
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.BR vmware .
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.IP
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Note that this list does not indicate the full set of VGA chips
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supported. For example,
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.B s3
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includes the 86C801/5, 86C928, Vision864, and Vision964.
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It is the job of
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.IR vga (8)
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to recognize which particular chip is being used and to initialize it
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appropriately.
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.TP
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.BI hwgc " gc"
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Set the type of hardware graphics cursor being used.
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.I Gc
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is one of
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.BR soft ,
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.BR 3dfxhwgc ,
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.BR ark200pvhwgc ,
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.BR bt485hwgc ,
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.BR clgd542xhwgc ,
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.BR clgd546xhwgc ,
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.BR ct65545hwgc ,
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.BR cyber938xhwgc ,
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.BR et4000hwgc ,
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.BR geodehwgc ,
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.BR hiqvideohwgc ,
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.BR i81xhwgc ,
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.BR igfxhwgc ,
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.BR mga2164whwgc ,
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.BR mach64xxhwgc ,
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.BR neomagichwgc ,
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.BR nvidiahwgc ,
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.BR radeonhwgc ,
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.BR rgb524hwgc ,
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.BR s3hwgc ,
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.BR t2r4hwgc ,
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.BR tvp3020hwgc ,
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.BR tvp3026hwgc
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and
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.BR vmwarehwgc .
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A value of
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.B off
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disables the cursor.
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.TP
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.BI palettedepth " d"
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Set the number of bits of precision used by the
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VGA palette to
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.IR d ,
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which must be either
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.B 6
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or
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.BR 8 .
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.TP
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.BI hwaccel " mode"
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Depending on whether
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.I mode
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is
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.B on
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or
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.BR off ,
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enable or disable whether hardware acceleration
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(currently for rectangle filling and moving)
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used by the graphics engine.
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The default setting is
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.BR on .
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.TP
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.BI softscreen " mode"
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Depending on whether
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.I mode
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is
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.B on
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or
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.BR off ,
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enable or disable shadow framebuffer to reduce
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slow bus reads. Enabling
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.BI softscreen
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disables hardware acceleration. The default setting is
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.BR off
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except for the
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.BR vesa
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driver.
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.TP
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.BI hwblank " mode"
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Depending on whether
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.I mode
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is
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.B on
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or
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.BR off ,
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enable or disable the use of DPMS blanking
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(see
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.IR mouse (3)).
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.TP
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.BI linear " size align"
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Use a linear screen aperture of size
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.I size
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aligned on an
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.IR align -byte
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boundary.
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.TP
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.B drawinit
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Initialize the graphics hardware.
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This must be sent after setting the
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.BR type .
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.PP
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Reading
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.B vgactl
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returns the current settings, one per line.
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.SH EXAMPLES
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The following disables hardware acceleration.
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.IP
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.EX
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echo hwaccel off > /dev/vgactl
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.EE
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.SH SOURCE
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.B /sys/src/9/pc/devvga.c
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.SH SEE ALSO
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.IR arch (3),
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.IR vga (8)
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.SH BUGS
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The hardware graphics cursor on the
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.B et4000
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does not work in 2x8-bit mode.
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