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qk1 - (9) quake
===============

Port of linux/x11 quake and quakeworld to plan9front.  Tested and known to
work on arm64, amd64, 386 and arm.

For details, see: http://nopenopenope.net/posts/quake

This fork in particular was extended to support Arcane Dimensions[1] mod.

Hereafter `qk1' refers to the project as a whole, and `quake' and `quakeworld'
refer to the actual games.

[1] https://www.moddb.com/mods/arcane-dimensions

Installation and start up
-------------------------

	*Note*: all data filenames should be lowercased; exceptions are demo
	files, maps and other non-hardcoded files.

Besides building and installing qk1, you still need .pak files to play.  Both
shareware and registered versions work, as well as the official expansions,
and many mods.
The data files are to be installed in the system directory,
/sys/games/lib/quake/$gamename, where $gamename is `id1' for plain old quake,
`qw' for quakeworld, `hipnotic' or `rogue' for the expansions, _reaper_ for
the Reaper bot mod, etc.

Savegames, configuration files and other user-specific data like demos is
saved in $home/lib/quake/$gamename.  Shared demos can be installed in the
system directory instead.

	*Note*: demos in .pak files are a special case; they need to be
	installed in a user directory, named using the next available .pak
	index; for instance, the registered version has `pak0.pak' and
	`pak1.pak', thus the additional .pak file will be `pak2.pak'.

To install quake:

	; mk install
	# installation from cd; both shareware and registered versions work
	; cdfs
	; cp /mnt/cd/id1/*.pak /sys/games/lib/quake/id1/
	; unmount /mnt/cd
	# launch!
	; games/quake >/dev/null

To install quakeworld, first install quake, then:

	; cd qw
	; mk install
	# a qwprogs.dat file must be provided also, one is included
	; cp qw/progs/qwprogs.dat /sys/games/lib/quake/qw/
	# launch!
	; games/qwcl >/dev/null

To start a quakeworld dedicated server:

	; echo scroll >/mnt/wsys/wctl
	; games/qwsv

To install an expansion (here from cd):

	; mkdir /sys/games/lib/quake/$mod
	# expansions provide at least .pak files
	; cdfs
	; cp /mnt/cd/$mod/*.pak /sys/games/lib/quake/$mod/
	; unmount /mnt/cd
	# launch!
	; games/quake -g rogue >/dev/null

To install a mod

	; mkdir /sys/games/lib/quake/$mod
	; dircp /n/hjdicks/$mod /sys/games/lib/quake/$mod
	# launch!
	; games/quake -g $mod >/dev/null



Memory limit (applies to QW only)
---------------------------------
By default, qw allocates 64 MB of memory for its internal heap.  This
amount can be controlled via a command line parameter, which is sadly
different between games (i'm to blame):

	; games/qwcl -mem 192
	; games/qwsv -mem 192

It is necessary to increase it when playing on larger resolutions, else qw
might crash with errors such as 'Hunk_Alloc: failed on 548512 bytes'.  Mods
may require more memory as well.  The old default was 12 MB, so it can also
be lowered in the unlikely case that it's necessary.  Typically, this
needn't be touched.


Mouse usage
-----------
Both quake and quakeworld now grab the mouse and have free mouse look by
default.  Mouse grabbing is controled via a console variable at runtime:

	] m_windowed 1

Mouse look on the other hand is enabled with a command:

	] +mlook

To disable mouse look, use `-mlook'.


Screen resolution (applies to QW only)
--------------------------------------
The rio(1) window running qw can be resized at will and at runtime, but must
the drawing area's size must be between 320x160 and 2047x2048.  To help with
drawing speed, scaling up from a fixed resolution has been implemented.  When
enabled, qw will behave like doom(1), where window size determines at
runtime a scaling factor.

quakeworld:

	; games/qwcl -scale 320 200


Framerate and performance
-------------------------
To play the games comfortably the framerate should be above 72.  There are
several things to note:

- lowering the resolution (window size) improves performance
- scaling up graphics from a lower resolution improves performance
- performance influences sound output and can cause underflows (see below)
- on slower or uniprocessor machines, the parallel cd audio process affects
  performance

In quakeworld, the framerate is controlled by one of two console variables,
`cl_maxfps' and `rate' and can be between 30 and 72.  If `cl_maxfps' is not
set, framerate is set to `rate' / 80.  `cl_maxfps' is now set to 72 by
default and saved on exit.

A simple way to benchmark is to play a demo with an uncapped framerate (one
must be provided for quakeworld beforehand):

	] timedemo demo3


Audio and music
---------------
On low framerates, devaudio's delay must be increased appropriately, up to
4410 (for a rate of 44.1 kHz), or sound will cut up.  This applies to
quakeworld as well, for which the framerate can also be capped lower.

qk1 reads /mnt/cd/[au]NNN files as in cdfs(1) to play music.  The directory
needn't be populated by cdfs(1), so long as the files are raw signed little-
endian 16-bit pcm audio, as described by audio(3).  CD playback requires
mixfs(1).


Known bugs
----------
- regression: cd audio with actual cd's broken
- a rare crash at d_sprite.c:/D_SpriteDrawSpansd can occur when running for
a long time
- an infinite loop in world.c:/SV_TouchLinks can sometimes occur
- (amd64) entities visible through walls right when emerging from/immerging
  into water
- resolutions other than 4:3: some vertical and horizontal strips on the edge
  of the screen aren't drawn
- sprites are not scaled correctly on higher resolutions and become=
disproportionate
- #define PARANOID reveals several points of failure that are otherwise ignored
- both stdio(2) and print(2) are used due to the way colored strings are, how
to handle this gracefully is unknown
- questionable pr_edict.c:/PR_Str hack may cause problems (QW only)
- refactoring: manpages, command line args, merge quakeworld, FIXME's in code


Legal
-----
Quake, hence qk1, is licensed under the GPLv2. see COPYING for details.