sineOut           168 src/swfc-history.c 		case IF_SINE_OUT: return sineOut(fraction, p1, p2 - p1);
sineOut           155 src/swfc-interpolation.c     return sineOut(2 * fraction - 1, start + delta / 2, delta / 2);
sineOut            95 src/swfc-interpolation.h float sineOut(float fraction, float start, float delta);