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This control is only useful if the video output is called "opengl".

This should fix compilation on non-Apple Darwin and plausibly addresses
hypothetical future support for Mesa's shared GLAPI.

This mostly consists of ifdeffing out parts selectively from
opengl.c based on whether shaders or the fixed pipeline are
absent.

Both the ES1 and ES2 outputs have been tested on Ubuntu on
a pandaboard. They seem to mostly work fine, but overlay
subpictures seem garbled.
Signed-off-by: Martin Storsjö <martin@martin.st>

Re-license almost all the playback modules to LGPLv2.1+ with
authorization from their respective contributors (230+)

This includes:
 - access, codec, packetizers, demux
 - audio filters, audio mixers, audio output
 - video filters, video chroma, video output
 - text renderers
 - XML parser
 - ARM NEON and SSE2 optimisations (mostly for chromas and filters)

Some modules are not concerned:
 - BDA and DShow access modules because Manol Manolov is AWOL
 - Real RTSP, because it is derived from Xine
 - x264 and t140 because they are encoders only
 - DLL Loader, because it is derived from MPlayer
 - DTS packetizer, because Jon Lech Johansen is AWOL
 - Shine and WMAfixed, because they are derived from Rockbox
 - Real demuxer, as it is derived from MPlayer and Wang Bo is AWOL
 - MPC demuxer, as Yavor Doganov is AWOL
 - Tivo demuxer, because it is derived from an MPlayer fork
 - Playlist demuxer, (WPL and ZPL parts missing), because suheaven is AWOL
 - iOS audio output and video display, because author refuses the license change
 - Equalizer and compressor, because Ronald Wright is AWOL
 - Mono, Headphone and Dolby, because author refuses the license change
 - hqdn3d and yadif, because they are from MPlayer/libavfilter
 - remoteosd, because it derives from RealVNC code
 - MMX optimisations, because Ollie Lho, from SiS, is AWOL
 - Rotate, because it depends on GPL motion

Nota Bene:
 - Some modules depend on GPL-only libraries, a LGPL module does not mean
   that the resulting binary module will be LGPL.
   Libraries affected would include liba52, libdvdcss, libdvdnav, libdvdread,
   faad2, libdca, libmad, libmpeg2, libpostproc, SRC, sid, zvbi and probably others.

It is missing some features w.r.t. window management.

Cool hints:
 - If your header doesn't match "Lesser" 3 times, you are not good
 - If you use LGPLv2, you are not good
 - If you use the old FSF address, you are not good

This is shown in the list of selected modules in Simple preferences.

Not yet used.

It is not yet used.

The parameter is not yet used.

This suffers from the same limitations as the EGL output (no resize and
mouse events) currently and should be considered work in progress.

This is purely a syntactical change to share the opengl.c code.
This commit does not actually make use of the vlc_gl_Create().

You have to set the list of chromas the module support in
vout_display_t::info.subpicture_chromas and then handle the subpicture_t
parameters in vout_display_t::prepare/display.

P.S.: I haaaaaaaaaaaaaaate Xlib!!!!

Currently, this require EGL 1.3 or later to compile.
This was only tested against the GLX driver from the Mesa Project,
and desktop OpenGL, which requires EGL 1.4. Win32 support is untested
(not even compilation).

OpenGL ES 1 and 2 are mostly implemented but completely untested too.
The USE_OPENGL_ES constant would have to be predefined appropriately.

This plugin mostly works, but there are two major remaining issues.
Therefore, this plugin is disabled by default and has zero priority.

(1) Mouse is not implemented. The stupid fix involves cut&paste from
the XCB-GLX plugin. Moving mouse event reception to the window provider
might be smart though: I would rather not corrupt the EGL plugin with
X11, otherwise we might as well stick to GLX anyway.

(2) Resize events are mostly not working. EGL does not provide
notification for this. But there may be some bugs in Control() too.