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https://github.com/libretro/scummvm.git
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f4ba8a6485
This removes the large static tables from the binary (which saves 500K to 1Mb of binary size) and replaced them with a class which generates the required tables as needed in RAM. This has been tested with QDM2 and shows no obvious performance degredation and Memprof shows no significant rise in RAM usage.
53 lines
1.5 KiB
C++
53 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*x/n) for 0<=x<=n/4,
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// followed by its reverse
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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 = 1; i < m / 4; i++)
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_table[m / 2 - 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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