5
Xdaniver is a fast, colour X11R6 server for the Amiga's custom chip set
6
under NetBSD 1.0 and NetBSD-current, supporting all the Amiga's display
7
depths from 1 to 4 (upto 16 colours) on ECS machines and 1 to 8 (upto 256
8
colours) on AGA machines (though, not all resolutions are available, see
9
General Information below).
11
Xdaniver is designed to be a drop-in replacement for the Xmono server provided
12
with the X11R6 binary distribution supplied by Bernd Ernesti available from
13
ftp.uni-regensburg.de or one of its mirrors.
15
Unlike previous colour X servers for the Amiga that emulate a chunky pixel
16
screen in fast RAM, use the standard frame buffer drivers provided with the
17
X11R6 source code to draw and then use a chunky to planar conversion routine
18
to write the results to the screen (all very slow), Xdaniver uses a heavily
19
modified mono frame buffer driver to draw directly using the Amiga's planar
20
format. The net result is much faster drawing and support for all the Amiga's
21
custom display depths but, as usual, the fewer planes used, the faster the
22
drawing operations of the X server. Even so, on my A1200 with a 33Mhz 68030,
23
I'm getting reasonable performance when using 8 bit planes in Dbl NTSC mode.
28
You will need to have first obtained and installed the X11R6 binary
29
distribution available from ftp.uni-regensburg.de in
30
/pub/NetBSD-Amiga/contrib/X11 or one of its mirrors. Xdaniver has been
31
compiled to expect font and configuration files sitting under
32
/usr/local/X11R6, if your setup is different you will need to provide a
33
symbolic link from /usr/local/X11R6 to where your tree resides or supply
34
several command line flags to the server.
36
To get Xdaniver running as the default X server, copy the uncompressed binary
37
into /usr/local/X11R6/bin, remove the current X file from that directory
38
(which is a symbolic link to Xmono) and replace it with a link to Xdaniver:
40
gzip -d < X11R6.Xdaniver.1.01.tar.gz | tar xvf -
41
mv Xdaniver /usr/local/X11R6/bin
42
cd /usr/local/X11R6/bin
46
Note that on some setups, the devices /dev/kbd, /dev/mouse and /dev/view??
47
have been created to be accessable only by superuser; Xdaniver needs to open
48
these devices. To workaround this problem, log on as superuser and then
49
either make Xdaniver setuid root:
54
or give everyone access the devices:
56
chmod 666 /dev/kbd /dev/mouse /dev/view??
58
the latter option is a possible cause of a security hole if your machine is
64
The default resolution of the server is 700x430 and the default depth 4. AGA
65
users might what to increase the display depth by editing the startx script
66
and providing a -depth <depth> argument to Xdaniver on the xinit line of the
67
script. As always, the lower the depth, the faster the drawing and window
68
manipulation of the server.
70
The resolution can be altered similarly by suppling -width <width> and
71
-height <height> arguments to the server.
73
The NetBSD kernel selects actual screen modes by picking a mode who's
74
natural, non-overscanned size best-fits the requested resolution.
75
Unfortunately, for AGA users, the 1.0 kernel only has support for the
76
Dbl-NTSC AGA display mode and only this mode has support for depths greater
77
than 4. The NetBSD-current (work-in-progress) kernel also has support for
78
Dbl-PAL but still no support for the Super72 or other super-hires modes
79
(perhaps some kind, kernel-hacker could add support for them ?).
81
If you have a 2 button mouse (like me) you might want to try and use the 3
82
button mouse emulation. On other systems, it is usual for the left and right
83
buttons to be provided and emulate the middle button by pressing both
84
buttons together, however, the middle button is tends to be used more than
85
the right button so I have provided two options:
87
-emulateright (or -3), the two physical mouse buttons act as left and middle
88
and pressing them both together emulates the right button.
90
-emulatemiddle (or -2), the two physical mouse buttons act as left and right
91
and pressing them both together emulated the middle button.
93
When using screen depths of less than 6 (4 is the maximum for ECS machines)
94
the lack of possible colours on screen at once causes problems for many X
95
applications. Specifying -cc 2 as a command line argument to Xdaniver
96
causes the server to switch the default visual type from PsuedoColor to
97
StaticColor; to put it simply, the server prefills the colormap with a
98
selection of 16 colours (depth 4) and when an application asks for a
99
particular colour, its gets allocated one that is closest to one from the
100
selection of 16. This removes the 'WARNING: Cannot allocate colormap entry
101
for "XXX"' errors but at the expense of applications not being able to get
102
the precise colour they wanted. Also, some badly written X applications fail
103
altogether when presented with a StaticColor visual.
108
The limited choice of display resolutions for AGA/ECS machines is a real
109
pain - requires a kernel change to fix. Worse still, the kernel specifies
110
the maximum overscan resolution on the Dbl-NTSC to be 724x482 but selecting
111
anything more than 702x430 on my machine causes the screen either sheer
112
diagonally (as if the bytes per row calculation in Xdaniver or the kernel is
113
wrong) or completely loose sync (suggesting a custom chip register sync
114
calculation bug). As other, non-aga modes aren't affected when selection
115
overscan both problems seem to point to a kernel driver bug. Also, depths
116
greater than 4 for AGA users are only supported by the kernel in the Dbl-NTSC
117
mode (and Dbl-PAL with the current-NetBSD kernel).
119
I know of one bug so-far (there will be more), The PutImage request of an XY
120
format image expects the bitplane order to be the reverse of that specified
121
in the X protocol but since virtually all applications use the Z (chunky)
122
format, you are unlikely to come across this problem.
124
The PutImage request of Z format images is a little slow - when I have time
125
I'll try and add one of the fast assembly chunky-to-planar routines developed
126
for doom style games/demos. Unfortunately, the current crop all require a
127
picture size that is a multiple of 32 pixels and so cannot be used out-of-the-
130
Some extra performance could easily be squeezed out of the terminal font
131
drawing code (used by xterm) - when I have time I'll add the code.
133
The Amiga's blitter and sprites are totally unused and will remain so
134
until/if someone else adds support to the kernel. The blitter would help
135
speed up screen scrolling and window manipulation and sprite support could
136
be used for the X pointer shape (if small enough) which would speed up all
137
drawing operations (no need to remove the software based pointer shape
138
first, draw, then replace the pointer shape).
140
I removed the X image extension (XIE) from the X server as it increased the
141
size of the binary by some 400k. I haven't come across any applications that
142
need it yet (I haven't been looking!) so if you need the extension for some
143
reason send me e-mail and I'll build a server with the extension included.
145
The 3 button mouse emulation is very simple - to emulate the 3rd button you
146
have to press both button precisely at the same moment - I've got quite good
147
at it now. When I have some spare time I'll add a timer so you will have a
148
few milli-seconds between one button being pressed and the next and it still
149
being registered as the emulated button.
151
AGA users don't forget to provide the -A flag to loadbsd to enable the one
152
AGA mode in the 1.0 kernel but only if you have a VGA, multisync or dual-scan
155
Xdaniver has been tested on:
157
A1200, 33Mhz 68030, 8Mb RAM and NetBSD 1.0 by myself.
158
A4000/40, 12Mb RAM and NetBSD 1.0 by Andreas Holzhammer.
159
A3000, 12Mb RAM and NetBSD 1.0 by Charlie Root, Stuart Park and others.
160
A3000, 25Mhz 68040, 18Mb RAM and NetBSD-current by Michael K. Sanders.
161
A2000, 8Mb RAM and NetBSD (version unknown) by Hubert Feyrer.
163
Release and Bug Fix History
164
---------------------------
169
- Narrow (<32 pixels) Z format GetImage requests corrupted the stack
170
and could cause the server to core dump. (Xpaint caused this problem)
171
- Drawing dots (PolyPoint request) into a clipped window caused a
172
c pointer to go out of range, causing a core dump (xv showed this
176
- Simple 3 button mouse emulation using a 2 button mouse; specify
177
-emulate_middle (or -2) or -emulate_right (or -3) on the server's
178
command line and press both mouse buttons together emulate the 'missing'
180
- Basic beep sound support added by sending bell characters to the
182
- Source code released.
184
Disclaimer and Copyright Notices
185
--------------------------------
187
Multi-depth planar frame buffer code:
188
Copyright (c) 1995 by Daniver Limited.
191
Copyright (c) 1994 by Eduardo Horvath.
192
Copyright (c) 1987-1995 by the Regents of the University of California.
193
Copyright (c) 1987 by Sun Microsystems, Inc. Mountain View, CA.
194
Copyright (c) 1987-1995 by X Consortium.
195
Copyright (c) 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts.
196
Copyright (c) 1989 Network Computing Devices, Inc., Mountain View, California.
198
Permission to use, copy, modify, and distribute this software and its
199
documentation for any purpose and without fee is hereby granted, provided
200
that the above copyright notice appear in all copies. The Daniver Limited,
201
the above companies and individuals makes no representations about the
202
suitability of this software for any purpose. It is provided "as is" without
203
express or implied warranty.
208
Thanks to Bernd Ernesti for making the operating system server source code
209
available for others to use and Eduardo Horvath and Andy Heffernan, who (I
210
think) did the original Xmono server port.
212
Also, many thanks to the first brave users who tested Xdaniver for me on other
213
Amiga setups and found a few bugs in the process.
217
Daytime: garyh@wet.sbi.com
218
Home: gary@daniver.demon.co.uk