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annotate libs/vmath/vmath.inl @ 39:ff055bff6a15

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copyright statements and stuff
author John Tsiombikas <nuclear@mutantstargoat.com>
date Sun, 11 Sep 2011 09:03:18 +0300
parents fb4c9641059f
children
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nuclear@39 1 /*
nuclear@39 2 libvmath - a vector math library
nuclear@39 3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@39 4
nuclear@39 5 This program is free software: you can redistribute it and/or modify
nuclear@39 6 it under the terms of the GNU Lesser General Public License as published
nuclear@39 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@39 8 (at your option) any later version.
nuclear@39 9
nuclear@39 10 This program is distributed in the hope that it will be useful,
nuclear@39 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@39 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@39 13 GNU Lesser General Public License for more details.
nuclear@39 14
nuclear@39 15 You should have received a copy of the GNU Lesser General Public License
nuclear@39 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@39 17 */
nuclear@39 18
nuclear@29 19 #include <stdlib.h>
nuclear@29 20
nuclear@29 21 /** Generates a random number in [0, range) */
nuclear@29 22 static inline scalar_t frand(scalar_t range)
nuclear@29 23 {
nuclear@29 24 return range * (scalar_t)rand() / (scalar_t)RAND_MAX;
nuclear@29 25 }
nuclear@29 26
nuclear@29 27 /** Generates a random vector on the surface of a sphere */
nuclear@29 28 static inline vec3_t sphrand(scalar_t rad)
nuclear@29 29 {
nuclear@29 30 scalar_t u = (scalar_t)rand() / RAND_MAX;
nuclear@29 31 scalar_t v = (scalar_t)rand() / RAND_MAX;
nuclear@29 32
nuclear@29 33 scalar_t theta = 2.0 * M_PI * u;
nuclear@29 34 scalar_t phi = acos(2.0 * v - 1.0);
nuclear@29 35
nuclear@29 36 vec3_t res;
nuclear@29 37 res.x = rad * cos(theta) * sin(phi);
nuclear@29 38 res.y = rad * sin(theta) * sin(phi);
nuclear@29 39 res.z = rad * cos(phi);
nuclear@29 40 return res;
nuclear@29 41 }
nuclear@29 42
nuclear@29 43 /** linear interpolation */
nuclear@29 44 static inline scalar_t lerp(scalar_t a, scalar_t b, scalar_t t)
nuclear@29 45 {
nuclear@29 46 return a + (b - a) * t;
nuclear@29 47 }