MT32: Update MT-32 emulator to latest Munt code

Several changes against original code were made. They were intentionally
kept to the minimum

1 files changed, 73 insertions, 0 deletions

diff --git a/audio/softsynth/mt32/mmath.h b/audio/softsynth/mt32/mmath.h
new file mode 100644
index 0000000000..60f492f9f0
--- /dev/null
+++ b/audio/softsynth/mt32/mmath.h
@@ -0,0 +1,73 @@
+/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
+ * Copyright (C) 2011 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
+
+#define FIXEDPOINT_UDIV(x, y, point) (((x) << (point)) / ((y)))
+#define FIXEDPOINT_SDIV(x, y, point) (((x) * (1 << point)) / ((y)))
+#define FIXEDPOINT_UMULT(x, y, point) (((x) * (y)) >> point)
+#define FIXEDPOINT_SMULT(x, y, point) (((x) * (y)) / (1 << point))
+
+#define FIXEDPOINT_MAKE(x, point) ((Bit32u)((1 << point) * x))
+
+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);
+}
+
+}
+
+#endif