warzone2100/lib/framework/trig.h

51 lines
1.6 KiB
C

/*
This file is part of Warzone 2100.
Copyright (C) 1999-2004 Eidos Interactive
Copyright (C) 2005-2007 Warzone Resurrection Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*! \file trig.h
* * \brief Interface to trig lookup tables
*/
#ifndef _trig_h
#define _trig_h
/* The number of units around a full circle */
#define TRIG_DEGREES 360
/* conversion macros */
#define DEG_TO_RAD(x) (x * M_PI / 180.0)
#define RAD_TO_DEG(x) (x * 180.0 / M_PI)
/* Initialise the Trig tables */
extern BOOL trigInitialise(void);
/* Shutdown the trig tables */
extern void trigShutDown(void);
/* Lookup trig functions */
// These can be assumed const, since they only rely on memory setup on startup
extern float trigSin(int angle) WZ_DECL_CONST;
extern float trigCos(int angle) WZ_DECL_CONST;
extern float trigInvSin(float val) WZ_DECL_CONST;
extern float trigInvCos(float val) WZ_DECL_CONST;
/* Supposedly fast lookup sqrt - unfortunately it's probably slower than the FPU sqrt :-( */
extern float trigIntSqrt(unsigned int val);
#endif