libretro / libretro/ps2

TFF and BFF interlacing (both annoyingly utilized at different points in game)

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Dominant language
C++
Stars
85
Forks
26
Avg merge
6h 43m
Merged PRs (30d)
6

Description

There's probably better examples, but with Bloody Roar 3 (USA), the intro screens before the title screen (activision and hudson logos) interlace as Bottom Field First, while in game everything is TFF.

Automatic deinterlace doesn't fix this (defaults to TFF deinterlacing), only way to see the company logo screens correctly is to set BFF, and then manually switch to any deinterlacing method that's TFF.

I'm more concerned about games that in the actual game switch between BFF and TFF interlacing. Since everything in Bloody Roar 3 looks correct with TFF in the actual game.

Will TFF/BFF detection be updated to fix this? Thanks!

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing Bloody Roar 3 (USA) and inspect the interlacing behavior across the Activision and Hudson intro screens and in-game scenes. Confirm whether field-order changes can be detected automatically, then add coverage for the observed TFF/BFF transitions and verify that both the intro and gameplay display correctly.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
45/100

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