[Scummvm-tracker] [ScummVM :: Bugs] #13429: OpengGL with Shaders over OGLES2 cause visuall trash when we spawn a GUI of Launcher.

[ScummVM :: Bugs]

#13429: OpengGL with Shaders over OGLES2 cause visuall trash when we spawn a GUI of
Launcher.
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Reporter:  kas1e         |      Owner:  (none)
    Type:  defect        |     Status:  new
Priority:  normal        |  Component:  Graphics
 Version:                |   Keywords:  OpenGL ES, graphics, GUI, Launcher,
    Game:                |  AmigaOS4
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 Find out that at least on AmigaOS4 (maybe on some other platforms too),
 when we run ScummVM with "OpenGL with Shaders" (so OGLES2 build) every
 spawn of GUI Launcher cause some visuall glitches.

 Issue maybe related to ScummVM's context removal/creation when switching
 from GUI to 3D game , or from game to GUI.

 I made a video some days ago to show how those engines with shaders like
 GRIM, Myst3, Stark and WME3D looks like) and there you can see those
 glitches.

 Video:  https://youtu.be/vgo_hIOauEk

 Glitches can be seen on :
 1:35 - when we just run scummvm
 1:44 - when we run a game from laucher
 10:57 - when we exit from game via ctrl+f5 to back to launcher
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Ticket URL: <https://bugs.scummvm.org/ticket/13429>
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