There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.
Keep it for external users in order to not cause breakages.
Also improve the other headers a bit while just at it.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
We calculated offsets as pairs, but addressed them in the shader
as single float values, while reading them as ivec2s.
Also removes unused code (was provisionally added if cooperative matrices
could be used, but that turned out to be impossible).
internal.h does not depend on video.h (and should not depend on it)
and therefore should not include video.h at all; instead all users
of video.h should include it directly.
Doing so also avoids unnecessary video.h inclusions in files that
don't need it, like most audio filters.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>