#!/bin/rc -e
# set up namespace for a particular version of doom and launch it
# default setup:
# - $home/lib/doom: mntpt and location of config file
# - $home/lib/doom/$game: user game directories: savegames and screenshots
# - /sys/games/lib/doom/$game: system iwad and pwad directories
# cwd is bound over $mntpt to allow loading stuff from there
# example: launch doom2 with scythe.wad (both in /sys/games/lib/doom/d2)
#	; doom d2 -file scythe.wad
# example game version names:
# doom.wad → /sys/games/lib/doom/d1/
# doom2.wad → /sys/games/lib/doom/d2/
# doom2f.wad → /sys/games/lib/doom/d2f/
# doom1.wad → /sys/games/lib/doom/dsh/
# plutonia.wad → /sys/games/lib/doom/plt/
# tnt.wad → /sys/games/lib/doom/tnt/
# doomu.wad → /sys/games/lib/doom/ud/

rfork ne
flagfmt='b,l,z,m mntpt'
args='game [params]'
if(! ifs=() eval `{aux/getflags $*} || ~ $#* 0){
	aux/usage
	exit usage
}
mntpt=$home/lib/doom
if(~ $#flagm 1)
	mntpt=$flagm
if(! test -d $mntpt/$1)
	mkdir -p $mntpt/$1
bind -ac $mntpt/$1 $mntpt
if(test -d /sys/games/lib/doom/$1)
	bind -a /sys/games/lib/doom/$1 $mntpt
if(! ~ $flagb 1)
	bind -b `{pwd} $mntpt
cd $mntpt

# max scaling factor is 4 unless doom itself is patched
if(~ $#vgasize 0 || ~ $flagz 1)
	r=(-dx 328 -dy 208)
if not
	r=`{echo $vgasize |\
		awk -Fx '{
			a=$1/320;
			b=$2/200;
			c=int(b<a?b:a);
			if(c*320 == $1 || c*200 == $2)
				c--;
			print "-dx", c*320+8, "-dy", c*200+8
		}'
	}
if(! ~ $flagz 1)
	echo resize $r >/dev/wctl

if(! ~ $flagl 1)
	games/doom $* >/dev/null
if not
	games/doom $* >/tmp/doomlog.$pid >[2=1]