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Not yet used.

It will allow to add subpictures blending.

 It seems that some intel drivers did not like the syntax used to embed the
coefficients directly into the source code.
 Also, it is more flexible and will allow runtime changes.

It is not yet used.

All planar YUV are supported (only YV12, I420, I422, I444 were tested).

For now, the YUV is supposed to follow BT-709 when video height is higher
than 576, and BT-601 otherwise. The YUV range is supposed to be TV, and
the RGB one is supposed to be full range.

In the current state, the behaviour is unchanged on macosx (ie YUY2
is used instead), and when opengl ES is requested (RGB 16 bits).

They are now allocated with picture_New and so they will be suitable for
direct rendering.
The requested number of pictures is now respected when both opengl es and
macosx are not used/defined.

The parameter is not yet used.

The numerical values are the same, but they don't have the same meaning.

v1 does not work and v2 does not compile but nevermind...

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

Signed-off-by: Pierre d'Herbemont <pdherbemont@free.fr>

This fixes the opengl "vout display" on Mac OS X.

Note, the opengl output is still broken on Mac OS X, in the way that no picture are rendered.

It will be used by opengl vout_displays.