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.TH GNGB 1
.\" NAME should be all caps, SECTION should be 1-8, maybe w/ subsection
.\" other parms are allowed: see man(7), man(1)
.SH NAME
gngb \- emulate various Nintendo Game Boy handheld systems
.SH SYNOPSIS
.B gngb
.I [-h] | [options] <romname>
.SH "DESCRIPTION"
.B gngb
is an emulator program that attempts to be various forms of
Nintendo Game Boy hardware.  It can run the various homebrew games and
demos for the system as well as images of commercially-released games.
.PP
This manual page was written for the Debian GNU/Linux distribution
because the original program does not have a manual page.
.SH OPTIONS
The program follows the usual GNU command line syntax, with long
options starting with two dashes (`-').
A summary of options are included below.
.TP
.B \-h, \-\-help
print help and exit
.TP
.B \-a, \-\-autoframeskip
turn on autoframeskip.  This is useful if the emulator is running too slow.
It will cause the emulator to drop frames every now and then to maintain a
realtime emulation.
.TP
.B \-\-sleep_idle
sleep when idle.  This will cause the program to sleep when it has idle
cycles instead of busy looping.  However, this can degrade emulation performance
under some circumstances.
.TP
.B \-\-color_filter
turn on the color filter.
.TP
.B \-r, \-\-rumble
turn on the rumble simulation.  This will cause the emulated screen to shake
when a rumble effect is caused by the running program.
.TP
.B \-\-filter=X
Set the filter to apply.  These only work when using standard (not YUV or GL)
video output.
0 = none
1 = scanline
2 = scanline 50%
3 = smooth
4 = pseudo cell shading
.TP
.B \-R, \-\-res=WxH
set the screen resolution to WxH (for YUV and GL mode only).
.TP
.B \-Y, \-\-yuv
turn YUV mode on.  This utilizes the hardware YUV colorspace conversion and
scaling features if your video card supports it.  Most video cards with Xv
support can use this feature for excellent performance.
.TP
.B \-\-yuv_type
set the type of the YUV overlay: 0 = YV12  1 = YUY2
.TP
.B \-o, \-\-opengl
turn OpenGL mode on.  This will render the gameboy screen as an OpenGL 3D
texture, which on some cards may perform much better than the YUV or X11
output.  This requires a 3D card with GLX support.
.TP
.B \-f, \-\-fullscreen
run gngb in fullscreen.  Fullscreen can be toggled during use with F9.
.TP
.B \-\-fps
Show frames per second counter in the upper left corner of screen.  May
be toggled through the emulator's menu.
.TP
.B \-s, \-\-sound
Enable sound.
.TP
.B \-\-sample_rate=RATE
Set the sound output sample rate to RATE. (typically a multiple of 11025 Hz)
.TP
.B \-\-auto_gb
Automatically detect the system to emulate based on the cartridge image that
is selected.  This should work in most cases.  If it fails, you can use one
of the [
.B \-C, \-\-color_gb
|
.B \-G, \-\-normal_gb
|
.B \-S, \-\-super_gb
] options to force emulation of a Color, Normal, or Super Game Boy.
.TP
.B \-j, \-\-joy_dev=N
The default joystick is /dev/js0.  By setting N here, /dev/jsN will be used
in its place.
.TP
.B \-g, \-\-gdma_cycle
This experimental option will halt the CPU during certain DMA operations.
Leave it off unless you are working around problems in a certain program.
.TP
.B \-v, \-\-version
Show version of program.
.PP
Most options can be disabled with --no-OPTION (Ex: --no-sound turn sound off)
.PP
.SH "DEFAULT BINDINGS"
These are the default keys in the emulator.  These, along with the joystick
buttons, may be changed through a custom gngbrc(5) file.

.br
Enter          : Start
.br
Right Shift    : Select
.br
W              : B
.br
X              : A
.br
TAB            : Open menu
.P
F9             : fullscreen on/off
.br
F10            : show fps
.br
F11            : reset
.br
F12            : show keysym code
.P
KeyPad 1-5: Change palette
.RS
Palette must be define in your gngbrc file (see sample_gngbrc)
.RE

KeyPad 6  : Toggle color filter 

.SH "SEE ALSO"
There is some good info in the README included in the doc directory.
The gngbrc file is documented in /usr/share/doc/gngb/examples/sample_gngbrc.
.SH AUTHOR
This manual page was written by RCU <nemesis@dbz.icequake.net>,
for the Debian GNU/Linux system (but may be used by others).