MT32: Update Munt to 2.0.0

This changeset also removes unnecessary direct modifications to
Munt code to ease future updates. To update Munt in the future:

1. Replace all source files in the `softsynth/mt32` directory with
   new files from the upstream `mt32emu/src` directory;
2. Update `config.h` with the correct version number for the new
   version of Munt;
3. Update `module.mk` to match the list of sources given in
   `mt32emu/CMakeLists.txt libmt32emu_SOURCES`.

1 files changed, 21 insertions, 20 deletions

diff --git a/audio/softsynth/mt32/LA32FloatWaveGenerator.cpp b/audio/softsynth/mt32/LA32FloatWaveGenerator.cpp
index 42d820ebad..824204e81b 100644
--- a/audio/softsynth/mt32/LA32FloatWaveGenerator.cpp
+++ b/audio/softsynth/mt32/LA32FloatWaveGenerator.cpp
@@ -1,5 +1,5 @@
 /* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
- * Copyright (C) 2011, 2012, 2013, 2014 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
+ * Copyright (C) 2011-2016 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
@@ -15,10 +15,11 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-//#include <cmath>
-#include "mt32emu.h"
+#ifndef MT32EMU_LA32_WAVE_GENERATOR_CPP
+#error This file should be included from LA32WaveGenerator.cpp only.
+#endif
+
 #include "mmath.h"
-#include "internals.h"
 
 namespace MT32Emu {
 
@@ -38,10 +39,10 @@ float LA32WaveGenerator::getPCMSample(unsigned int position) {
 	return ((pcmSample & 32768) == 0) ? sampleValue : -sampleValue;
 }
 
-void LA32WaveGenerator::initSynth(const bool sawtoothWaveform, const Bit8u pulseWidth, const Bit8u resonance) {
-	this->sawtoothWaveform = sawtoothWaveform;
-	this->pulseWidth = pulseWidth;
-	this->resonance = resonance;
+void LA32WaveGenerator::initSynth(const bool useSawtoothWaveform, const Bit8u usePulseWidth, const Bit8u useResonance) {
+	sawtoothWaveform = useSawtoothWaveform;
+	pulseWidth = usePulseWidth;
+	resonance = useResonance;
 
 	wavePos = 0.0f;
 	lastFreq = 0.0f;
@@ -50,24 +51,24 @@ void LA32WaveGenerator::initSynth(const bool sawtoothWaveform, const Bit8u pulse
 	active = true;
 }
 
-void LA32WaveGenerator::initPCM(const Bit16s * const pcmWaveAddress, const Bit32u pcmWaveLength, const bool pcmWaveLooped, const bool pcmWaveInterpolated) {
-	this->pcmWaveAddress = pcmWaveAddress;
-	this->pcmWaveLength = pcmWaveLength;
-	this->pcmWaveLooped = pcmWaveLooped;
-	this->pcmWaveInterpolated = pcmWaveInterpolated;
+void LA32WaveGenerator::initPCM(const Bit16s * const usePCMWaveAddress, const Bit32u usePCMWaveLength, const bool usePCMWaveLooped, const bool usePCMWaveInterpolated) {
+	pcmWaveAddress = usePCMWaveAddress;
+	pcmWaveLength = usePCMWaveLength;
+	pcmWaveLooped = usePCMWaveLooped;
+	pcmWaveInterpolated = usePCMWaveInterpolated;
 
 	pcmPosition = 0.0f;
 	active = true;
 }
 
+// ampVal - Logarithmic amp of the wave generator
+// pitch - Logarithmic frequency of the resulting wave
+// cutoffRampVal - Composed of the base cutoff in range [78..178] left-shifted by 18 bits and the TVF modifier
 float LA32WaveGenerator::generateNextSample(const Bit32u ampVal, const Bit16u pitch, const Bit32u cutoffRampVal) {
 	if (!active) {
 		return 0.0f;
 	}
 
-	this->amp = amp;
-	this->pitch = pitch;
-
 	float sample = 0.0f;
 
 	// SEMI-CONFIRMED: From sample analysis:
@@ -284,9 +285,9 @@ bool LA32WaveGenerator::isPCMWave() const {
 	return pcmWaveAddress != NULL;
 }
 
-void LA32PartialPair::init(const bool ringModulated, const bool mixed) {
-	this->ringModulated = ringModulated;
-	this->mixed = mixed;
+void LA32PartialPair::init(const bool useRingModulated, const bool useMixed) {
+	ringModulated = useRingModulated;
+	mixed = useMixed;
 	masterOutputSample = 0.0f;
 	slaveOutputSample = 0.0f;
 }
@@ -354,4 +355,4 @@ bool LA32PartialPair::isActive(const PairType useMaster) const {
 	return useMaster == MASTER ? master.isActive() : slave.isActive();
 }
 
-}
+} // namespace MT32Emu