[Scummvm-tracker] [ScummVM :: Bugs] #14582: Scumm Monkey Island 2 pathfinding doesn't match original

[ScummVM :: Bugs]

#14582: Scumm Monkey Island 2 pathfinding doesn't match original
----------------------------+---------------------------
Reporter:  ffyte            |      Owner:  (none)
    Type:  defect           |     Status:  new
Priority:  normal           |  Component:  Engine: SCUMM
 Version:                   |   Keywords:
    Game:  Monkey Island 2  |
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 ScummVM version (scummvm -v):
 ScummVM 2.8.0git (Aug  1 2023 13:08:24)
 Using SDL backend with SDL 2.0.20
 Features compiled in: Vorbis FLAC MP3 ALSA SEQ sndio TiMidity RGB zLib
 MPEG2 FluidSynth Theora AAC A/52 FreeType2 FriBiDi JPEG PNG GIF taskbar
 TTS cloud (servers, local) ENet SDL2 TinyGL OpenGL (with shaders)

 Your OS:
 Linux Mint 21.2 Cinnamon



 In Monkey Island 2, some speedrunners noticed that movement on the
 overhead-view map screens of the three islands works slightly differently
 on ScummVM compared to the original game. Because Guybrush's sprite is so
 small, it is hard to make out what exactly the difference is, but I think
 he walks at a different speed whenever he is moving at 45° angles. What is
 clear, is that Guybrush takes longer to reach his destination on ScummVM.
 Here is a list of test results for one specific spot, but I think this
 probably is a phenomenon that occurs at all times on these map screens.

 Time it takes Guybrush to walk from the Spitting Contest (exiting the
 screen on the right side) to the small guardhouse in front of Elaine's
 mansion. This was always just one click on the destination from a standing
 position right outside Ville de la Booty. Timed from the first frame we
 see Guybrush move on the map until the screen changes from the map screen
 to the guardhouse:
 - DOS/Ger DOSBox emulator: 8.3s
 - DOS/Ger DREAMM emulator: 8.3s
 - DOS/Eng DOSBox emulator: 8.3s
 - FM Towns/Eng DREAMM emulator : 8.3s
 - Amiga/Ger PUAE emulator: 8.3s
 - DOS/Eng ScummVM: 8.8s
 - DOS/Ger ScummVM: 8.8s
 - FM Towns/Eng ScummVM: 8.8s
 - Amiga/Ger ScummVM: 8.8s

 Here is a comparison video with FM Towns on ScummVM at the top, DOS on
 DOSBox at the bottom:
 https://cdn.discordapp.com/attachments/428303733466726419/1141406194221731901/wthbooty.webm


 Something else about MI2 pathfinding on ScummVM, which is probably
 unrelated:
 There's always been one tiny, irrelevant difference in the pathfinding
 that I noticed. When Guybrush does a 180° turn, on ScummVM he turns in the
 other direction. Like when you open the envelopes in jail, on ScummVM he
 goes up-right-down. On the original game he goes up-left-down. You can
 also notice it in some other spots.
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Ticket URL: <https://bugs.scummvm.org/ticket/14582>
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