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Align frame advance and movies to full field boundaries #8347
Currently, frame-stepping and
This is [conceptually] inconsistent with accurate SI polling emulation (#8236 and other WIP branches) because SI polls may occur in the space between active video fields. Here's some log output from a game that does SI polling four times in one field:
This ensures that "a movie frame" (and the check for frame-stepping) starts at the same time as a "full field."