/* DE1: $Id: m_vector.h 2102 2005-01-14 19:00:34Z skyjake $
 * Copyright (C) 2004 Jaakko Keränen <jaakko.keranen@iki.fi>
 *
 * This program 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.
 *
 * This program 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 this program; if not: http://www.opensource.org/
 */

/*
 * m_vector.h: Vector Math
 */

#ifndef __DOOMSDAY_MISC_VECTOR_H__
#define __DOOMSDAY_MISC_VECTOR_H__

typedef float         vectorcomp_t;
typedef vectorcomp_t  vec2_t[2];
typedef vectorcomp_t  vec3_t[3];
typedef vectorcomp_t *pvec2_t;
typedef vectorcomp_t *pvec3_t;
typedef vec2_t       *arvec2_t;
typedef vec3_t       *arvec3_t;

void            V2_Set(pvec2_t vec, vectorcomp_t x, vectorcomp_t y);
void            V2_SetFixed(pvec2_t vec, fixed_t x, fixed_t y);
float           V2_Length(const pvec2_t vector);
float           V2_Distance(const pvec2_t a, const pvec2_t b);
float           V2_Normalize(pvec2_t vector);
void            V2_Copy(pvec2_t dest, const pvec2_t src);
void            V2_Scale(pvec2_t vector, float scalar);
void            V2_Sum(pvec2_t dest, const pvec2_t src1, const pvec2_t src2);
void            V2_Subtract(pvec2_t dest, const pvec2_t src1,
							const pvec2_t src2);
float           V2_DotProduct(const pvec2_t a, const pvec2_t b);
float           V2_ScalarProject(const pvec2_t a, const pvec2_t b);
void            V2_Project(pvec2_t dest, const pvec2_t a, const pvec2_t b);
boolean         V2_IsParallel(const pvec2_t a, const pvec2_t b);
boolean         V2_IsZero(const pvec2_t vec);
float           V2_Intersection(const pvec2_t p1, const pvec2_t delta1,
								const pvec2_t p2, const pvec2_t delta2,
								pvec2_t point);
float           V2_Intercept(const pvec2_t a, const pvec2_t b, const pvec2_t c,
							 const pvec2_t d, pvec2_t point);
boolean         V2_Intercept2(const pvec2_t a, const pvec2_t b,
							  const pvec2_t c, const pvec2_t d, pvec2_t point,
							  float *abFrac, float *cdFrac);
void            V2_Lerp(pvec2_t dest, const pvec2_t a, const pvec2_t b,
						float c);
void            V2_InitBox(arvec2_t box, const pvec2_t point);
void            V2_AddToBox(arvec2_t box, const pvec2_t point);

#endif