wm4 e23e4c7c60 cocoa: don't accidentally drop initial screen drawing ...

With --idle --force-window, or when started from the bundle, the cocoa
code dropped the first frame. This resulted in a black frame on start
sometimes.

The reason was that the live resizing/redrawing code was invoked, which
simply set skip_swap_buffer to false, blocking redrawing whatever was
going to be rendered next. Normally this is done so that the following
works:

1. vo_opengl draw a frame, releases GL lock
2. live resizing kicks in, redraw the frame
3. vo_opengl wants to call SwapBuffers, drawing a stale buffer
   overwritten by the live resizing code

This is solved by setting skip_swap_buffer in 2., and querying it in 3.

Fix this by resetting the skip_swap_buffer at a known good point: when
vo_opengl starts drawing a new frame.

The start_frame function returns bool, so that it can be merged with
is_active in a following commit.

2015-05-01 18:26:58 +02:00

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