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Is it possible to unlock the mouse in fullscreen mode so that you can use it on a another monitor? I read trough the SDL documentation, but I couldn't find anything related to my problem.

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It's likely you don't want to use "real" fullscreen, but "fake" fullscreen (full size borderless window). See this question on SO and maybe it'll help you: stackoverflow.com/questions/7927974/… –  Tetrad Feb 27 '13 at 22:05
I didn't need to do anything special to support this when I did exactly this, yesterday, testing on OSX using SDL version 2.0.2. Had a fullscreen window on one monitor, not set to capture the mouse, and I was able to freely move the mouse back to the other monitor and interact with windows there. What you're seeing might be platform-specific behaviour? (In which case, you should specify what platform you're working on) –  Trevor Powell Apr 10 at 4:36
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This is for SDL 2, but have you showing the cursor cursor and seeing if it can escape?

function for creating a cursor:

int SDL_ShowCursor(int toggle)    

so it would be like this


look more into it here:


personally I do not have a second monitor so I cannot help you

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