[Scummvm-tracker] [ScummVM :: Bugs] #13169: Myst III Exile: missing scene transition effect on PowerPC (big-endian) machines on all OSes

[ScummVM :: Bugs]

#13169: Myst III Exile: missing scene transition effect on PowerPC (big-endian)
machines on all OSes
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Reporter:  kas1e                           |       Owner:  (none)
    Type:  defect                          |      Status:  new
Priority:  normal                          |   Component:  Engine: Myst3
 Version:                                  |  Resolution:
Keywords:  big endian, BE, Myst3, AmigaOS  |        Game:  Myst 3: Exile
-------------------------------------------+----------------------------
Description changed by kas1e:

Old description:

> While testing AmigaOS4 builds of ScummVM (v2.5.0 and daily build from
> 25.12.2021) find out a rendering issue.
>
> the issue is that switch between scenes in Myst3 does not have that nice
> transition effect when one scene is replaced by another one. instead, we
> have or just a white screen for a time while the transition effect should
> happen or a bit of visual trash (depends on the drivers we use).
>
> if we use an older version of our drivers called MiniGL  we have such a
> visuall mess:
>
> https://youtu.be/ndhmxNXlLH4?t=78
>
> if watch carefully between switching of scenes then instead of effect we
> have some purple vertical lines all over the screen for a time of effect.
>
> And that if I use another more modern OpenGL driver called GL4ES:
>
> https://youtu.be/KiDJ3ox51lU?t=37
>
> There all visibly better. just instead of a color mess, we have a white
> screen for the time while the effect should happen and then a new scene
> happens.
>
> When I test the same version of the game but on win32/x64 then all fine
> means it's probably a Big-Endian issue.
>
> if you need any more details or tests just ask :)
>
> Thanks!

New description:

 While testing AmigaOS4 builds of ScummVM (v2.5.0 and daily build from
 25.12.2021) find out a rendering issue.

 The issue is that switch between scenes in Myst3 does not have that nice
 cross-fade effect when one image is fade out and another one fade it,
 making one image replace another with tasty cross-fade effect. Instead, we
 have or just a white screen for a time while the cross-fade effect should
 happen or a bit of visual trash (depends on the drivers we use).

 If we use an older version of our drivers called MiniGL we have such a
 visuall mess:

 https://youtu.be/ndhmxNXlLH4?t=78

 If watch carefully between switching of scenes then instead of effect we
 have some purple vertical lines all over the screen for a time of effect.
 Mean that no-cross-fade happens, but nothing instead and unitialized stuff
 have place.

 And that if I use another more modern OpenGL driver called GL4ES:

 https://youtu.be/KiDJ3ox51lU?t=37

 There all visibly better. Just instead of a color mess, we have a white
 screen for the time while the effect should happen and when a new scene
 happens.

 When I test the same version of the game but on win32/x64 then all fine
 means it's probably a Big-Endian issue.

 If needs any more details or tests just ask :)

 Thanks!

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Ticket URL: <https://bugs.scummvm.org/ticket/13169#comment:7>
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