81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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This file is part of Warzone 2100.
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Copyright (C) 1999-2004 Eidos Interactive
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Copyright (C) 2005-2007 Warzone Resurrection Project
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Warzone 2100 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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Warzone 2100 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 Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/** \file
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* * \brief Interface to trig lookup tables
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*/
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#ifndef _trig_h
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#define _trig_h
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#include "frame.h"
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#include "math-help.h"
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/* The number of units around a full circle */
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#define TRIG_DEGREES 360
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/* conversion macros */
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#define DEG_TO_RAD(x) (x * M_PI / 180.0)
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#define RAD_TO_DEG(x) (x * 180.0 / M_PI)
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/*!
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* Moves x into the range 0 - y
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* \param x Value to clip
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* \param y Upper range
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* \return Value in the range 0 - y
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT int wrap(int x, int y)
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{
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while(x < 0) x += y;
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while(x >= y) x -= y;
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return x;
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}
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/*!
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* Moves x into the range 0.0f - y
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* \param x Value to clip
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* \param y Upper range
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* \return Value in the range 0.0f - y
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT float wrapf(float x, float y)
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{
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while(x < 0.0f) x += y;
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while(x >= y) x -= y;
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return x;
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}
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/* Initialise the Trig tables */
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extern BOOL trigInitialise(void);
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/* Shutdown the trig tables */
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extern void trigShutDown(void);
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/* Lookup trig functions */
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// These can be assumed const, since they only rely on memory setup on startup
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extern float trigSin(int angle) WZ_DECL_CONST;
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extern float trigCos(int angle) WZ_DECL_CONST;
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extern float trigInvSin(float val) WZ_DECL_CONST;
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extern float trigInvCos(float val) WZ_DECL_CONST;
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/* Supposedly fast lookup sqrt - unfortunately it's probably slower than the FPU sqrt :-( */
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extern float trigIntSqrt(unsigned int val);
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#endif
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