kripken/emscripten — pull request #1639 by anlambert (2013-09-19 12:00:43+00:00)
Title: Add mouse wheel events support in GLUT library

This change add support for mouse wheel events in glut library (really usefull to perform zoom in/zoom out operations on OpenGL scene).

The wheel events are forwarded to the standard glutMouseFunc callback. As in freeglut, wheel reports as button 3 (scroll up) and button 4 (scroll down).