MAMEWorld Forums - EmuChat - SDL Mame: Mouse Acceleration?

Hi:

I'm running SDL Mame on Linux and trying to get my mouse movement settings right. I am testing with both my Ultimarc U-Trak and regular mouse. My MAME analog sensitivity settings seem to be good at 230 - the regular mouse works fine at default 30 or 50 but U-Trak needs higher sensitivity. I've only been using Centipede for testing.

I've noticed that there is no actual "acceleration". It doesn't matter how fast I move the mouse: slow / short vs long / hard movements react the same and moves the player icon the same distance. Both the mouse and trackball have this issue.

Is the lack of acceleration specific to Centipede? A limitation of MAME? Or am I missing something?

For SDL, MAME seems to requrie "SDL_MOUSE_RELATIVE=1" in order to have correct mouse movements, otherwise invisible walls will occur. SDL_VIDEO_X11_MOUSEACCEL seems to have no effect within MAME (doesn't work with SDL_MOUSE_RELATIVE on, anyway).

Any insights would be appreciated. Thanks.