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90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
#pragma once
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//
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// FILE: FastTrig.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.3
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// PURPOSE: Arduino library for a faster approximation of sin() and cos()
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// DATE: 2011-08-18
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// URL: https://github.com/RobTillaart/FastTrig
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// https://forum.arduino.cc/index.php?topic=69723.0
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#ifdef ESP_PLATFORM
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#include <math.h>
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#include <stdint.h>
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#include <stdbool.h>
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#else
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#include "Arduino.h"
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#endif
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#define FAST_TRIG_LIB_VERSION (F("0.3.3"))
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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extern uint16_t sinTable16[];
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extern uint8_t sinTable8[];
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///////////////////////////////////////////////////////
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//
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// GONIO INT EXPERIMENTAL
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//
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int isin256(uint32_t v);
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int icos256(uint32_t v);
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// calculate both in one call.
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void isincos256(uint32_t v, int *si, int *co);
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///////////////////////////////////////////////////////
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//
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// GONIO LOOKUP
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//
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float isin(float f);
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float icos(float x);
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// calculate both in one call.
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void isincos(float v, float *si, float *co);
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float itan(float f);
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// 0 returns NAN but we have a icot(x) cotangent.
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float icot(float f);
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///////////////////////////////////////////////////////
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//
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// INVERSE GONIO LOOKUP
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//
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float iasin(float f);
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float iacos(float f);
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// PLACEHOLDER (might be obsolete due to atanFast() formula.
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float iatan(float f);
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// fast atan() formula, in fact a modified Taylor expansion
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// input = -1 .. 1
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float atanFast(float f);
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inline float atanHelper(float x);
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// atan2Fast() folds and mirrors => calls atanFast() + offset.
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float atan2Fast(float y, float x);
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///////////////////////////////////////////////////////
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//
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// HYPOT
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// related but not strict gonio.
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//
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// hypotFast() formula for faster hypot() at the price of accuracy
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// experimental!
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float hypotFast(float x, float y);
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#ifdef __cplusplus
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}
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#endif
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// -- END OF FILE --
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