35 lines
779 B
C
35 lines
779 B
C
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/*!
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* \file
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*
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* This file contains function prototypes for very fast lookup-table based
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* trigonometric functions.
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*
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* The functions take an argument that is dependent on the lookup-table size
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* (LUT_SIZE). LUT_SIZE corresponds to 2π. Values outside the range
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* [0..LUT_SIZE] are supported and interpreted normally, so just replace 2π
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* with LUT_SIZE and you're done.
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*/
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#pragma once
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#include <cstdint>
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namespace fasttrigon {
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static const uint32_t LUT_SIZE = 1024;
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/*!
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* \returns 127 * sin(2π * arg / LUT_SIZE)
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*/
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int32_t fastsin(int32_t arg);
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/*!
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* \returns 127 * cos(2π * arg / LUT_SIZE)
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*/
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int32_t fastcos(int32_t arg);
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/*!
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* \returns 127 * tan(2π * arg / LUT_SIZE)
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*/
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int32_t fasttan(int32_t arg);
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}
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