[Scummvm-tracker] [ScummVM :: Bugs] #15151: BACKENDS: OPENGL: Alpha channel changes cause color regression on PowerBook G4

[ScummVM :: Bugs]

#15151: BACKENDS: OPENGL: Alpha channel changes cause color regression on PowerBook
G4
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Reporter:  dwatteau  |      Owner:  (none)
    Type:  defect    |     Status:  new
Priority:  normal    |  Component:  Graphics
 Version:            |   Keywords:
    Game:            |
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 I'm seeing a regression with commit
 `6342045cc3e23dc9f685241d89ad3da478885f70` ("BACKENDS: OPENGL: Don't take
 the alpha channel from the game texture") (as found by a Git bisect).

 This appears with any game (but not the menu), only in `opengl` mode, not
 in `surfacesdl` mode.

 ScummVM 2.8.x doesn't have this problem. I don't think it's OS-related,
 because I see this issue on both OpenBSD/macppc and Debian ppc.

 The machine is a G4 PowerBook5,6 (big-endian PPC processor), with an ATI
 Radeon Mobility 9600/9700 (M10/M11) GPU.

 I don't know if the issue is endian-related, or just old-GPU-related.

 Attaching some files below. Feel free to ping me for any test!
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Ticket URL: <https://bugs.scummvm.org/ticket/15151>
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