OpenMW in fullscreen with resolution set lower than native is unplayable
due to a very old PC, I have to switch the resolution from 1920x1080 to 800x600 in order to be able to play with enough FPS.
before the switch to SDL2, it was ok, now it's a mess.
it seems like the game is drawn with 800x600 resolution in a virtual screen of 1920x1020 with only 800x600 visible. moving the mouse makes the 800x600 visible window to move across the 1920x1020 virtual screen.
switching to window mode makes the game to be playable
(RM-884 from redmine: created on 2013-08-14 by Yann GOUY, , relates #3512 (closed))