dsound: Implement AngleBetweenVectorsDeg as a call to AngleBetweenVectorsRad.

dlls/dsound/sound3d.c

@@ -102,8 +102,8 @@ static inline D3DVALUE RadToDeg (D3DVALUE angle)
 	return newangle;
 }
 
-/* angle between vectors - deg version */
-static inline D3DVALUE AngleBetweenVectorsDeg (const D3DVECTOR *a, const D3DVECTOR *b)
+/* angle between vectors - rad version */
+static inline D3DVALUE AngleBetweenVectorsRad (const D3DVECTOR *a, const D3DVECTOR *b)
 {
 	D3DVALUE la, lb, product, angle, cos;
 	/* definition of scalar product: a*b = |a|*|b|*cos...therefore: */
@@ -112,26 +112,14 @@ static inline D3DVALUE AngleBetweenVectorsDeg (const D3DVECTOR *a, const D3DVECT
 	lb = VectorMagnitude (b);
 	cos = product/(la*lb);
 	angle = acos(cos);
-	/* we now have angle in radians */
-	angle = RadToDeg(angle);
-	TRACE("angle between (%f,%f,%f) and (%f,%f,%f) = %f degrees\n",  a->x, a->y, a->z, b->x,
-	      b->y, b->z, angle);
+	TRACE("angle between (%f,%f,%f) and (%f,%f,%f) = %f radians (%f degrees)\n",  a->x, a->y, a->z, b->x,
+	      b->y, b->z, angle, RadToDeg(angle));
 	return angle;	
 }
 
-/* angle between vectors - rad version */
-static inline D3DVALUE AngleBetweenVectorsRad (const D3DVECTOR *a, const D3DVECTOR *b)
+static inline D3DVALUE AngleBetweenVectorsDeg (const D3DVECTOR *a, const D3DVECTOR *b)
 {
-	D3DVALUE la, lb, product, angle, cos;
-	/* definition of scalar product: a*b = |a|*|b|*cos...therefore: */
-	product = ScalarProduct (a,b);
-	la = VectorMagnitude (a);
-	lb = VectorMagnitude (b);
-	cos = product/(la*lb);
-	angle = acos(cos);
-	TRACE("angle between (%f,%f,%f) and (%f,%f,%f) = %f radians\n",  a->x, a->y, a->z, b->x,
-	      b->y, b->z, angle);
-	return angle;	
+	return RadToDeg(AngleBetweenVectorsRad(a, b));
 }
 
 /* calculates vector between two points */