gsathya/SDL-emscripten — pull request #11 by turol (2014-08-26 10:33:12+00:00)
Title: Fix mouse wheel event Y-coordinate to match desktop version

This fixes mouse wheel direction y-values (positive up, negative down, same as desktop SDL2).
Important note: if OS X has "natural scrolling" enabled the wheel direction appears to be reversed. Edward Rudd is working on a portable fix for this which should eventually be added to SDL2 main repository.