[Scummvm-tracker] [ScummVM :: Bugs] #13152: MYST3: Mouse movements are limited to rectangle in full screen mode when using SDL v2.0.18

[ScummVM :: Bugs]

#13152: MYST3: Mouse movements are limited to rectangle in full screen mode when
using SDL v2.0.18
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Reporter:  ctoroman  |       Owner:  (none)
    Type:  defect    |      Status:  new
Priority:  normal    |   Component:  Engine: Myst3
 Version:            |  Resolution:
Keywords:            |        Game:  Myst 3: Exile
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Comment (by kalkie):

 Does this issue occur in scaled HiDPI mode, e.g. on MacOS with a Retina
 display? If so, then I've submitted a PR for fixing this issue:
 ​https://github.com/scummvm/scummvm/pull/3699

 The usage of SDL_SetWindowMouseRect() didn't take the HiDPI scaling into
 account. Thus, the coordinates of the allowed mouse area were off by the
 scaling factor, e.g. 2x greater than they should be. Now that this
 SDL_SetWindowMouseRect() is used, there are actually two parallel
 mechanisms for grabbing the mouse and limiting its movement to the game's
 viewport. Because of this, not taking the HiDPI scaling into account
 limits the mouse movement incorrectly only on the left/top part of the
 screen.

 This issue only happens with the OpenGL graphics mode, because the SDL
 Surface mode doesn't support HiDPI mode. There are quite a few workarounds
 for the issue, in addition to changing the graphics mode. One could
 disable mouse capture (Ctrl+m) or change to one of the stretch modes
 filling the entire screen with the game. If the game's viewport fills the
 whole window, the top/left coordinates of the allowed mouse area are zero,
 and thus not being affected by the incorrect scaling.
-- 
Ticket URL: <https://bugs.scummvm.org/ticket/13152#comment:4>
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