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69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
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* Copyright (C) 2011-2021 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
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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 Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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#ifndef MT32EMU_MMATH_H
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#define MT32EMU_MMATH_H
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#include <cmath>
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namespace MT32Emu {
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// Mathematical constants
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const double DOUBLE_PI = 3.141592653589793;
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const double DOUBLE_LN_10 = 2.302585092994046;
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const float FLOAT_PI = 3.1415927f;
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const float FLOAT_2PI = 6.2831853f;
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const float FLOAT_LN_2 = 0.6931472f;
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const float FLOAT_LN_10 = 2.3025851f;
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static inline float POWF(float x, float y) {
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return pow(x, y);
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}
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static inline float EXPF(float x) {
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return exp(x);
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}
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static inline float EXP2F(float x) {
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#ifdef __APPLE__
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// on OSX exp2f() is 1.59 times faster than "exp() and the multiplication with FLOAT_LN_2"
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return exp2f(x);
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#else
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return exp(FLOAT_LN_2 * x);
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#endif
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}
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static inline float EXP10F(float x) {
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return exp(FLOAT_LN_10 * x);
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}
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static inline float LOGF(float x) {
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return log(x);
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}
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static inline float LOG2F(float x) {
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return log(x) / FLOAT_LN_2;
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}
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static inline float LOG10F(float x) {
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return log10(x);
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}
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} // namespace MT32Emu
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#endif // #ifndef MT32EMU_MMATH_H
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