21f87070af
This is a regression from f4ba8a6485. The
commit replaced the static cosine and sine tables with dynamically created
ones. In the process of that a copy&paste error happened which made the sine
table use the layout of the cosine table. This commit now changes the
dynamically created sine tables to conform to the layout of the previous
static tables.
52 lines
1.5 KiB
C++
52 lines
1.5 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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// Based on eos' sine tables
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#include "common/scummsys.h"
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#include "common/sinetables.h"
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namespace Common {
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SineTable::SineTable(int bitPrecision) {
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assert((bitPrecision >= 4) && (bitPrecision <= 16));
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_bitPrecision = bitPrecision;
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int m = 1 << _bitPrecision;
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double freq = 2 * M_PI / m;
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_table = new float[m];
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// Table contains sin(2*pi*i/m) for 0<=i<m/4,
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// followed by m/2<=i<3m/4
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for (int i = 0; i < m / 4; i++)
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_table[i] = sin(i * freq);
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for (int i = 0; i < m / 4; i++)
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_table[m / 4 + i] = -_table[i];
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}
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SineTable::~SineTable() {
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delete[] _table;
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}
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} // End of namespace Common
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