It seems like this would be extremely easy, but not so much. If I tap the touch screen on my tablet, it doesn't immediately move mouse_pos. Even if I wait a frame or two, mouse_pos remains at the last tap position, which makes pressing buttons quite unintuitive.

Is there anything I can do, in lite-C or a plugin API, that will get the exact screen position of the most recent touch? I've attempted to process WM_GESTURE but had little success.