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= KMSCON =
Kmscon is a simple terminal emulator based on linux kernel mode setting (KMS).
It is an attempt to replace the in-kernel VT implementation with a userspace
console.
== Requirements ==
Kmscon requires the following software:
- libudev: providing input, video, etc. device hotplug support
Everything else is optional:
For video output at least one of the following is required:
- fbdev: For framebuffer video output the kernel headers must be installed
and located in the default include path.
- DRM: For unaccelerated drm output the "libdrm" library must be installed
and accessible via pkg-config.
- OpenGLES2: For accelerated video output via OpenGLESv2 the following must
be installed: libdrm, libgbm, egl, glesv2 (i.e., mesa)
By default a very limited built-in keyboard handling is used. To get other
keyboard layouts working, the following is required:
- libxkbcommon: keyboard handling (optional but strongly recommended)
Without libxkbcommon, basic US-ASCII input is provided.
libxkbcommon has no public release, yet, but is available on freedesktop.org.
Use "--disable-xkbcommon" if you have problems due to compile-errors.
For font handling the following is required:
- 8x16: The 8x16 font is a static built-in font which does not require
external dependencies.
- freetype2: The freetype2 font uses libfreetype2 and libfontconfig to
provide a very basic font backend.
- pango: drawing text with pango
Pango requires: glib, pango, fontconfig, freetype2 and more
For multi-seat support you need the following packages:
- systemd: Actually only the systemd-logind daemon and library is required.
== Install ==
To compile the kmscon binary, run the standard autotools commands:
$ ./autogen.sh (you need this only when building from git directly)
$ ./configure [--enable-debug] (debug-mode is strongly recommended)
$ make
$ make install (TODO: this is currently not supported)
To compile the test applications, run:
$ make check
If you want only a very basic kmscon program without any major dependencies,
use:
$ ./configure --disable-debug --disable-drm --disable-xkbcommon --disable-systemd --disable-pango --disable-freetype2
However, you will loose a lot of functionality by dropping all dependencies.
The following configure options are available. If build-time dependencies
cannot be satisfied, an option is automatically turned off, except if you
explicitely enable it via command line:
--enable-systemd: This requires the systemd-logind library to provide
multi-seat support for kmscon. [default: on]
--enable-udev: This requires libudev for hotplugging support. This is
currently mandatory and cannot be disabled. [default: on]
--enable-fbdev: This adds fbdev video output support. [default: on]
--enable-drm: This adds DRM video output support. [default: on]
--enable-gles2: This adds OpenGL hardware accelerated font rendering
[default: on]
--enable-xkbcommon: Use xkbcommon for internationalized keyboard handling.
[default: on]
--enable-f8x16: The 8x16 font is a static built-in fallback font
[default: on]
--enable-freetype2: Uses freetype2 and fontconfig as font-backend.
[default: on]
--enable-pango: Uses pango as font-backend. [default: on]
--enable-bblit: Use simply 2D bit-blitting as renderering fallback
[default: on]
--enable-debug: Enable debug mode [default: off]
--enable-optimizations: Use GCC code optimizations [default: on]
== Running ==
To get usage information, run:
$ ./kmscon --help
You can then run kmscon with:
$ ./kmscon [options]
For debug output use "--debug". For verbose output use "--verbose". If you
didn't compile DRM support then you can use "--fbdev" to make kmscon select
available framebuffer devices.
With "--xkb-layout=<lang>" you can switch the keyboard layout.
== License ==
This software is licensed under the terms of the MIT license. Please see
./COPYING for further information.
== FAQ ==
Please see http://github.com/dvdhrm/kmscon/wiki
== Contact ==
This software is maintained by:
David Herrmann <dh.herrmann@googlemail.com>
If you have any questions, do not hesitate to contact one of the maintainers.
== Code Base ==
The kmscon code is split into several independent subsystems:
- uterm:
This code manages the KMS/DRI output and provides OpenGL framebuffers.
- console:
This draws the text on the screen and provides an API for any terminal
emulator to visualize its contents.
- eloop:
Main loop implementation.
- log:
Log file handling.
- unicode:
Provides basic Unicode handling.
- font:
Font loading, caching and drawing operations.
- input:
All linux input events are captured here and converted to Unicode
characters for input handling.
- vt:
The linux VT subsystem integration. This allows to run the application in
a classic linux VT like X does.
- vte:
The terminal emulator library.
- terminal:
Connects the console, output, input and vte handling into a real terminal.
- main:
This connects all subsystems into a usable console application.
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