The Quake 2 tools as originally released under the GPL license.

common/mathlib.h

@@ -0,0 +1,77 @@
+/*
+===========================================================================
+Copyright (C) 1997-2006 Id Software, Inc.
+
+This file is part of Quake 2 Tools source code.
+
+Quake 2 Tools source code is free software; you can redistribute it
+and/or modify it under the terms of the GNU General Public License as
+published by the Free Software Foundation; either version 2 of the License,
+or (at your option) any later version.
+
+Quake 2 Tools source code is distributed in the hope that it will be
+useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Quake 2 Tools source code; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+===========================================================================
+*/
+
+#ifndef __MATHLIB__
+#define __MATHLIB__
+
+// mathlib.h
+
+#include <math.h>
+
+#ifdef DOUBLEVEC_T
+typedef double vec_t;
+#else
+typedef float vec_t;
+#endif
+typedef vec_t vec3_t[3];
+
+#define	SIDE_FRONT		0
+#define	SIDE_ON			2
+#define	SIDE_BACK		1
+#define	SIDE_CROSS		-2
+
+#define	Q_PI	3.14159265358979323846
+
+extern vec3_t vec3_origin;
+
+#define	EQUAL_EPSILON	0.001
+
+qboolean VectorCompare (vec3_t v1, vec3_t v2);
+
+#define DotProduct(x,y) (x[0]*y[0]+x[1]*y[1]+x[2]*y[2])
+#define VectorSubtract(a,b,c) {c[0]=a[0]-b[0];c[1]=a[1]-b[1];c[2]=a[2]-b[2];}
+#define VectorAdd(a,b,c) {c[0]=a[0]+b[0];c[1]=a[1]+b[1];c[2]=a[2]+b[2];}
+#define VectorCopy(a,b) {b[0]=a[0];b[1]=a[1];b[2]=a[2];}
+#define VectorScale(a,b,c) {c[0]=b*a[0];c[1]=b*a[1];c[2]=b*a[2];}
+#define VectorClear(x) {x[0] = x[1] = x[2] = 0;}
+#define	VectorNegate(x) {x[0]=-x[0];x[1]=-x[1];x[2]=-x[2];}
+
+vec_t Q_rint (vec_t in);
+vec_t _DotProduct (vec3_t v1, vec3_t v2);
+void _VectorSubtract (vec3_t va, vec3_t vb, vec3_t out);
+void _VectorAdd (vec3_t va, vec3_t vb, vec3_t out);
+void _VectorCopy (vec3_t in, vec3_t out);
+void _VectorScale (vec3_t v, vec_t scale, vec3_t out);
+
+double VectorLength(vec3_t v);
+
+void VectorMA (vec3_t va, double scale, vec3_t vb, vec3_t vc);
+
+void CrossProduct (vec3_t v1, vec3_t v2, vec3_t cross);
+vec_t VectorNormalize (vec3_t in, vec3_t out);
+vec_t ColorNormalize (vec3_t in, vec3_t out);
+void VectorInverse (vec3_t v);
+
+void ClearBounds (vec3_t mins, vec3_t maxs);
+void AddPointToBounds (vec3_t v, vec3_t mins, vec3_t maxs);
+
+#endif