142 lines
2.8 KiB
C++
142 lines
2.8 KiB
C++
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 1997 Greg Lewis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
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*/
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// mathlib.c -- math primitives
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#include "qbsp.h"
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vec_t
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VectorLengthSq(const vec3_t v)
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{
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int i;
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vec_t lensq;
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lensq = 0;
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for (i = 0; i < 3; i++)
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lensq += v[i] * v[i];
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return lensq;
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}
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vec_t
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VectorLength(const vec3_t v)
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{
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return sqrt(VectorLengthSq(v));
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}
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bool
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VectorCompare(const vec3_t v1, const vec3_t v2)
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{
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int i;
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for (i = 0; i < 3; i++)
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if (fabs(v1[i] - v2[i]) > EQUAL_EPSILON)
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return false;
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return true;
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}
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vec_t
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Q_rint(vec_t in)
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{
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return floor(in + 0.5);
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}
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void
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VectorMA(const vec3_t va, const double scale, const vec3_t vb, vec3_t vc)
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{
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vc[0] = va[0] + scale * vb[0];
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vc[1] = va[1] + scale * vb[1];
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vc[2] = va[2] + scale * vb[2];
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}
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void
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CrossProduct(const vec3_t v1, const vec3_t v2, vec3_t cross)
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{
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cross[0] = v1[1] * v2[2] - v1[2] * v2[1];
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cross[1] = v1[2] * v2[0] - v1[0] * v2[2];
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cross[2] = v1[0] * v2[1] - v1[1] * v2[0];
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}
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vec_t
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DotProduct(const vec3_t v1, const vec3_t v2)
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{
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return v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2];
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}
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void
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VectorSubtract(const vec3_t va, const vec3_t vb, vec3_t out)
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{
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out[0] = va[0] - vb[0];
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out[1] = va[1] - vb[1];
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out[2] = va[2] - vb[2];
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}
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void
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VectorAdd(const vec3_t va, const vec3_t vb, vec3_t out)
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{
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out[0] = va[0] + vb[0];
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out[1] = va[1] + vb[1];
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out[2] = va[2] + vb[2];
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}
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void
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VectorCopy(const vec3_t in, vec3_t out)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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}
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vec_t
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VectorNormalize(vec3_t v)
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{
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int i;
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double length;
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length = 0;
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for (i = 0; i < 3; i++)
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length += v[i] * v[i];
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length = sqrt(length);
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if (length == 0)
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return 0;
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for (i = 0; i < 3; i++)
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v[i] /= length;
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return length;
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}
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void
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VectorInverse(vec3_t v)
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{
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v[0] = -v[0];
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v[1] = -v[1];
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v[2] = -v[2];
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}
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void
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VectorScale(const vec3_t v, const vec_t scale, vec3_t out)
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{
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out[0] = v[0] * scale;
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out[1] = v[1] * scale;
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out[2] = v[2] * scale;
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}
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