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audio/softsynth/mt32/mmath.h

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+/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
+ * Copyright (C) 2011-2022 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 2.1 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MT32EMU_MMATH_H
+#define MT32EMU_MMATH_H
+
+#include <cmath>
+
+namespace MT32Emu {
+
+// Mathematical constants
+const double DOUBLE_PI = 3.141592653589793;
+const double DOUBLE_LN_10 = 2.302585092994046;
+const float FLOAT_PI = 3.1415927f;
+const float FLOAT_2PI = 6.2831853f;
+const float FLOAT_LN_2 = 0.6931472f;
+const float FLOAT_LN_10 = 2.3025851f;
+
+static inline float POWF(float x, float y) {
+	return pow(x, y);
+}
+
+static inline float EXPF(float x) {
+	return exp(x);
+}
+
+static inline float EXP2F(float x) {
+#ifdef __APPLE__
+	// on OSX exp2f() is 1.59 times faster than "exp() and the multiplication with FLOAT_LN_2"
+	return exp2f(x);
+#else
+	return exp(FLOAT_LN_2 * x);
+#endif
+}
+
+static inline float EXP10F(float x) {
+	return exp(FLOAT_LN_10 * x);
+}
+
+static inline float LOGF(float x) {
+	return log(x);
+}
+
+static inline float LOG2F(float x) {
+	return log(x) / FLOAT_LN_2;
+}
+
+static inline float LOG10F(float x) {
+	return log10(x);
+}
+
+} // namespace MT32Emu
+
+#endif // #ifndef MT32EMU_MMATH_H