vo_opengl: make frame reupload logic more robust

It's not that easy to decide whether a frame needs to be
reuploaded/rerendered. Using unique frame IDs for input makes it
slightly easier and more robust. This also removes the use of video PTS
in the interpolation path.

This should also avoid reuploading the video frame if it's just redrawn
in paused mode, or when using OSD/subtitles in cover art mode.

1 files changed, 1 insertions, 0 deletions

diff --git a/video/out/vo.h b/video/out/vo.h
index d2393f829b..99e6ccabae 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -223,6 +223,7 @@ struct vo_frame {
     // a frame is guaranteed not to change (instant redraws will use the same
     // ID). frames[n] has the ID frame_id+n, with the guarantee that frame
     // drops or reconfigs will keep the guarantee.
+    // The ID is never 0 (unless num_frames==0). IDs are strictly monotonous.
     uint64_t frame_id;
 };