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Martin Gerhardy Not sure - but I think there might be a logic flaw in SDL_SetWindowGrab. The problem here is that this modifies the window flags and e.g. sets SDL_WINDOW_INPUT_GRABBED - but the _this->grabbed_window pointer is not yet set. Then in SDL_UpdateWindowGrab the _this->grabbed_window pointer is only set if the function pointer _this->SetWindowGrab is not NULL. But if this is NULL, the _this->grabbed_window pointer is never set, but every future call to any of the grab functions include an assert for: SDL_assert(!_this->grabbed_window || ((_this->grabbed_window->flags & SDL_WINDOW_INPUT_GRABBED) != 0)); That means the first call works, the second always fails and triggers the assert.
Simple DirectMedia Layer
(SDL)
Version 2.0
---
http://www.libsdl.org/
Simple DirectMedia Layer is a cross-platform development library designed
to provide low level access to audio, keyboard, mouse, joystick, and graphics
hardware via OpenGL and Direct3D. It is used by video playback software,
emulators, and popular games including Valve's award winning catalog
and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting
with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)