options: refactor how --opengl-dcomposition is declared

vo_opengl used to have it as sub-option, which made it very hard to pass
down option values to backends in a generic way (even if these options
were completely backend-specific). For --opengl-dcomposition we used a
VOFLAG to deal with this. Fortunately, sub-options are gone, and we can
just add it as global option.

Move the option to context_angle.c and add it as global option. I
thought about adding a mechanism to let backends declare options, which
would get magically picked up my m_config instead of having to add them
to the global option list manually (similar to VO vo_driver.options),
but decided against this complexity just for 1 or 2 backends. Likewise,
it could have been added as a single option to avoid the boilerplate of
an option struct, but then again there are probably going to be more
angle suboptions, and it's cleaner.

1 files changed, 1 insertions, 0 deletions

diff --git a/options/options.h b/options/options.h
index d3b0ace24f..842781cb4b 100644
--- a/options/options.h
+++ b/options/options.h
@@ -320,6 +320,7 @@ typedef struct MPOpts {
     char *input_file;
 
     struct gl_video_opts *gl_video_opts;
+    struct angle_opts *angle_opts;
     struct dvd_opts *dvd_opts;
 } MPOpts;