mirror of
https://gitlab.freedesktop.org/mesa/mesa.git
synced 2024-12-11 19:24:26 +08:00
7196cddb3a
Fully implemented glutGameMode, and added vidresize stubs to make Added support for glutReshapeDisplay to change video mode but not lose current mesa context. implementation glut 5 complient. Fixed many minor bugs Updated docs
112 lines
3.9 KiB
HTML
112 lines
3.9 KiB
HTML
<HTML>
|
|
|
|
<TITLE>Mesa glFBDev Driver</TITLE>
|
|
|
|
<link rel="stylesheet" type="text/css" href="mesa.css"></head>
|
|
|
|
<BODY>
|
|
|
|
<center><H1>Mesa glFBDev Driver</H1></center>
|
|
|
|
|
|
<H1>1. Introduction</H1>
|
|
|
|
<p>
|
|
The GLFBDev driver interface allows one to do OpenGL rendering into a
|
|
framebuffer managed with the Linux's fbdev interface.
|
|
</p>
|
|
|
|
<p>
|
|
Basically, the programmer uses the fbdev functions to initialize the
|
|
graphics hardware and setup the framebuffer.
|
|
Then, using a calls to Mesa's glFBDev API functions, one can render
|
|
into the framebuffer with the OpenGL API functions.
|
|
</p>
|
|
|
|
<p>
|
|
Note, only software rendering is supported; there is no hardware
|
|
acceleration.
|
|
</p>
|
|
|
|
|
|
<p>
|
|
The GL/glfbdev.h header file defines the glFBDev interface.
|
|
</p>
|
|
|
|
<p>
|
|
The progs/fbdev/glfbdevtest.c demonstrates how to use the glFBDev interface.
|
|
</p>
|
|
|
|
|
|
<p>
|
|
For more information about fbdev, see the
|
|
<a href="http://www.tldp.org/HOWTO/Framebuffer-HOWTO.html" target="_parent">
|
|
Framebuffer Howto</a>
|
|
</p>
|
|
<p>
|
|
You will need at minimum, a framebuffer device, check /dev/fb0
|
|
</p>
|
|
|
|
<h1>2. Compilation</h1>
|
|
|
|
<p>
|
|
To compile Mesa with support for the glFBDev interface:
|
|
<pre>
|
|
make realclean
|
|
make linux-fbdev
|
|
</pre>
|
|
|
|
<p>
|
|
When compilation is finished look in progs/glfbdev/ for the glfbdevtest demo.
|
|
</p>
|
|
<h1>3. Permissions</h1>
|
|
|
|
<p>
|
|
Typically /dev/fb/0 is grouped to the video group. It may be useful to add
|
|
your user to the video group so the demos will not have to be run as root.
|
|
To use fbdevglut with the prefered tty input, you should add the user to the
|
|
tty group as well
|
|
<p>
|
|
|
|
<h1>4. Using fbdevglut</h1>
|
|
Almost all of the programs in the progs directory use glut, and they compile with fbdevglut.
|
|
|
|
<p>
|
|
To compile the redbook sample programs:
|
|
<pre>
|
|
cd progs/redbook
|
|
make
|
|
</pre>
|
|
</p>
|
|
<p>glut features not supported:
|
|
<li>Overlays
|
|
<li>Subwindows
|
|
<li>Input devices other than Keyboard/Mouse
|
|
<li>No support for GLUT_MULTISAMPLE, GLUT_STEREO, or GLUT_LUMINANCE
|
|
<li>Cursor and Menu Support will flicker in GLUT_SINGLE mode
|
|
|
|
<p>Keyboard input is read by opening /dev/tty and reading keycodes in medium raw mode.
|
|
<p>Mouse input is read from env var MOUSE, or /dev/gpmdata and should be in ms3 format.
|
|
To forward data in this format to /dev/gpmdata, run gpm with the -Rms3 option.
|
|
<p> glutInit allows glut programs to pass parameters to the glut library, currently the
|
|
following options are supported for fbdevglut:
|
|
<p><li>-geometry widthxheight -- This will force the resolution to be widthxheight instead of autodetecting.
|
|
The modes are read from /etc/fb.modes
|
|
<p><li>-bpp -- This will force the bitdepth to the one specified
|
|
<p><li>-vt -- This allows you to specify the virtual terminal to attach keyboard input to. It is useful to specify when running inside screen.
|
|
<p><li>-mousespeed -- A floating point multiplication factor to increase mouse speed
|
|
<p><li>-nomouse -- Disable mouse support
|
|
<p><li>-nokeyboard -- Disable keyboard support (this will probably break mouse support as well)
|
|
<p><li>-stdin -- Use stdin for input instead of attaching to kbd in medium-raw mode.
|
|
This will make it impossible to detect keypresses like Shift+Tab, you will also need to specify -gpmmouse for mouse support. This option can be used with a debugger, and it is possible to single step a program with gdb and set the FRAMEBUFFER environment variable to a different framebuffer for display. The program will not be able to handle vt switching on it's own, so it will always display.
|
|
<p><li>-gpmmouse -- This will attempt to connect to the /dev/gpmctl socket using liblow
|
|
for mouse data. Gpm does not provide this data when in graphics mode, so vt switching
|
|
will briefly display text. This mode typically has no initial mouse delay.
|
|
<p><li>-- Ignore any additional arguments
|
|
<p>Notes:
|
|
<p>
|
|
1. The mouse pointer flickers in single buffering mode, as it must be rendered in software. Hopefully in the future there will be a way to access hardware cursors in fbdev devices.
|
|
</p>
|
|
</body>
|
|
</html>
|