[Scummvm-tracker] [ScummVM :: Bugs] #12476: GRAPHICS: OPENGL(3D): Switching screen modes erases game graphics, or may crash app. (was: GRAPHICS: OPENGL(3D): Switching screen modes erases game graphics.)

[ScummVM :: Bugs]

#12476: GRAPHICS: OPENGL(3D): Switching screen modes erases game graphics, or may
crash app.
-------------------+-----------------------
Reporter:  macca8  |       Owner:  criezy
    Type:  defect  |      Status:  new
Priority:  normal  |   Component:  Graphics
 Version:          |  Resolution:
Keywords:          |        Game:
-------------------+-----------------------
Changes (by macca8):

 * summary:  GRAPHICS: OPENGL(3D): Switching screen modes erases game
     graphics. =>
     GRAPHICS: OPENGL(3D): Switching screen modes erases game graphics, or
     may crash app.


Old description:

> When playing a game that uses 3D OpenGL (in my case, Myst3), pressing
> Alt+Enter erases the game graphics when the screen mode changes. Further
> switches fail to restore the graphics, requiring the user to exit the
> game, either by returning to the Launcher or quitting.
>
> Fortunately, the user can save their progress before exiting by accessing
> ScummVM’s Save dialog. Not surprisingly, this save features a blank
> thumbnail image, but is fully functional when reloaded after shutting
> down the game engine.
>
> Note that only the game’s graphics are erased, any sound continues as
> normal, and the GMM remains accessible (see attached screenshot).
>
> Switches in 2D games, or the Launcher, that use standard OpenGL or other
> graphics modes are not affected by this issue.
>
> This first appeared in daily build 2.3.0git15408-g9818b47554 (Apr 18
> 2021), and is likely a regression from
> https://github.com/scummvm/scummvm/commit/d33487f641bcd6e9e4d31a0bf91f7abf2f92c2e0
> - SDL: Refactor OpenGLSdlGraphics3dManager to inherit from
> SdlGraphicsManager - which was committed in that build.
>
> Tested on an Intel Mac running macOS 10.11.6, with a LoDPI screen (max
> 1920x1080).
>
> Truth be known, this is likely the same bug as reported in #12473,
> however since I’m seeing a totally blank (white) screen, these
> observations may contribute to a more complete overview of the issue.

New description:

 When playing a game that uses 3D OpenGL (in my case, Myst3), pressing
 Alt+Enter erases the game graphics when the screen mode changes. Further
 switches fail to restore the graphics, requiring the user to exit the
 game, either by returning to the Launcher or quitting.

 Fortunately, the user can save their progress before exiting by accessing
 ScummVM’s Save dialog. Not surprisingly, this save features a blank
 thumbnail image, but is fully functional when reloaded after shutting down
 the game engine.

 Note that only the game’s graphics are erased, any sound continues as
 normal, and the GMM remains accessible (see attached screenshot).

 Switches in 2D games, or the Launcher, that use standard OpenGL or other
 graphics modes are not affected by this issue.

 This first appeared in daily build 2.3.0git15408-g9818b47554 (Apr 18
 2021), and is likely a regression from
 https://github.com/scummvm/scummvm/commit/d33487f641bcd6e9e4d31a0bf91f7abf2f92c2e0
 - SDL: Refactor OpenGLSdlGraphics3dManager to inherit from
 SdlGraphicsManager - which was committed in that build.

 Tested on an Intel Mac running macOS 10.11.6, with a LoDPI screen (max
 1920x1080).

 Truth be known, this is likely the same bug as reported in #12473, however
 since I’m seeing a totally blank (white) screen, these observations may
 contribute to a more complete overview of the issue.

 Edit: See also comments 5 & 6 below for a variation of this behaviour
 applicable to using OpenGL with shaders (with Myst3).

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Ticket URL: <https://bugs.scummvm.org/ticket/12476#comment:7>
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