David Herrmann b860e485b4 context: add GLES2 support
OpenGL pulls in lot of X dependencies on linux. To avoid this we also
support OpenGLES2 now. This will also allow to run kmscon on
embedded/mobile platforms.
We still get X dependencies through EGL which we cannot avoid as EGL is
compiled with multiple backends on most systems. However, switching to
GLES2 reduces memory footprint by 30MB which is pretty good.

This also enables GLES2 as default in autogen.sh. However, default
behaviour of configure will still be GL.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
2012-01-20 18:11:03 +01:00
2012-01-20 18:11:03 +01:00
2012-01-17 15:19:43 +01:00
2012-01-20 18:11:03 +01:00
2012-01-20 18:11:03 +01:00
2011-12-31 16:40:06 +01:00
2012-01-20 15:45:58 +01:00
2012-01-01 23:04:13 +01:00

= 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:
    - libdrm: accessing the kernel graphics layer
    - mesa: providing an OpenGL implementation (must be compiled with EGL, gbm
            and GL libraries)
    - udev: providing input device hotplug
    - libxkbcommon: keyboard handling
    - glib: only for Unicode handling
    - One of:
      - freetype2: drawing generic text
      - pango: drawing text with pango (use --enable-pango)
               Pango requires: glib, cairo, pangocairo, pango and freetype2

== Install ==
  To compile the kmscon binary, run the standard autotools commands:
    $ ./configure [--enable-debug] [--enable-pango]
    $ make
    $ make install
  To compile the test applications, run:
    $ make check

== License ==
  This software is licensed under the terms of the MIT license. Please see
  ./COPYING for further information.

== FAQ ==
  === Why didn't you use libvte or similar terminal emulators? ===
  All existing terminal emulators I found highly depend on X. Also, their code
  base often is a horrible mess. I haven't had the time to convert them to use
  other drawing functions than Xlib, yet.
  If you feel like doing this work, please notify me. I would be glad to adjust
  my code to work with other terminal emulators.

== 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:
    - output:
      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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