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87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef MATH_SINETABLES_H
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#define MATH_SINETABLES_H
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#include "common/scummsys.h"
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namespace Math {
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/**
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* @defgroup math_sinetables Sine tables
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* @ingroup math
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*
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* @brief API for managing sine tables.
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*
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* @{
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*/
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class SineTable {
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public:
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/**
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* Construct a sine table given the number of points
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*
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* @param nPoints Number of distinct radian points, which must be in range [16,65536] and be divisible by 4
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*/
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SineTable(int nPoints);
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~SineTable();
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/**
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* Get pointer to table
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*
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* This table contains nPoints/2 entries.
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* Prefer to use at()
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* The layout of this table is as follows:
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* - Entries 0 up to (excluding) nPoints/4:
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* sin(0) till (excluding) sin(1/2*pi)
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* - Entries 2_nPoints/4 up to nPoints/2:
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* sin(pi) till (excluding) sin(3/2*pi)
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*/
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const float *getTable() { return _tableEOS; }
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/**
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* Returns sin(2*pi * index / nPoints )
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* Index must be in range [0, nPoints - 1]
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* Faster than atLegacy
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*/
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float at(int index) const;
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/**
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* Returns sin(2*pi * index / nPoints )
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* Index must be in range [0, nPoints - 1]
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*/
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float atLegacy(int index) const;
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private:
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float *_tableEOS;
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float *_table;
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double _radResolution; // Smallest radian increment
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int _refSize; // _nPoints / 4
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int _nPoints; // range of operator[]
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};
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/** @} */
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} // End of namespace Math
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#endif // MATH_SINETABLES_H
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