#ifndef __trackball_h__

#define __trackball_h__

#ifdef __cplusplus

extern "C" {

#endif

void startTrackball (long x, long y, long originX, long originY, long width, long height);

void rollToTrackball (long x, long y, float rot [4]); // rot is output rotation angle

void addToRotationTrackball (float * dA, float * A);

#ifdef __cplusplus

}

#endif

#endif