2006-09-25 09:46:28 -07:00
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/*! \file trig.h
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* * \brief Interface to trig lookup tables
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2007-06-28 10:47:08 -07:00
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*/
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#ifndef _trig_h
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#define _trig_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*PI/180.0)
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#define RAD_TO_DEG(x) (x*180.0/PI)
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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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extern FRACT trigSin(SDWORD angle);
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extern FRACT trigCos(SDWORD angle);
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extern FRACT trigInvSin(FRACT val);
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extern FRACT trigInvCos(FRACT val);
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/* Supposedly fast lookup sqrt - unfortunately it's probably slower than the FPU sqrt :-( */
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extern FRACT trigIntSqrt(UDWORD val);
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#endif
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