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, 119 insertions, 0 deletions

diff --git a/audio/softsynth/mt32/Partial.h b/audio/softsynth/mt32/Partial.h
new file mode 100644
index 0000000000..95218c858c
--- /dev/null
+++ b/audio/softsynth/mt32/Partial.h
@@ -0,0 +1,119 @@
+/* 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_PARTIAL_H
+#define MT32EMU_PARTIAL_H
+
+namespace MT32Emu {
+
+class Synth;
+class Part;
+class TVA;
+struct ControlROMPCMStruct;
+
+struct StereoVolume {
+	float leftVol;
+	float rightVol;
+};
+
+// A partial represents one of up to four waveform generators currently playing within a poly.
+class Partial {
+private:
+	Synth *synth;
+	const int debugPartialNum; // Only used for debugging
+	// Number of the sample currently being rendered by generateSamples(), or 0 if no run is in progress
+	// This is only kept available for debugging purposes.
+	unsigned long sampleNum; 
+
+	int ownerPart; // -1 if unassigned
+	int mixType;
+	int structurePosition; // 0 or 1 of a structure pair
+	StereoVolume stereoVolume;
+
+	// Distance in (possibly fractional) samples from the start of the current pulse
+	float wavePos;
+
+	float lastFreq;
+
+	float myBuffer[MAX_SAMPLES_PER_RUN];
+
+	// Only used for PCM partials
+	int pcmNum;
+	// FIXME: Give this a better name (e.g. pcmWaveInfo)
+	PCMWaveEntry *pcmWave;
+
+	// Final pulse width value, with velfollow applied, matching what is sent to the LA32.
+	// Range: 0-255
+	int pulseWidthVal;
+
+	float pcmPosition;
+
+	Poly *poly;
+
+	LA32Ramp ampRamp;
+	LA32Ramp cutoffModifierRamp;
+
+	float *mixBuffersRingMix(float *buf1, float *buf2, unsigned long len);
+	float *mixBuffersRing(float *buf1, float *buf2, unsigned long len);
+
+	float getPCMSample(unsigned int position);
+
+public:
+	const PatchCache *patchCache;
+	TVA *tva;
+	TVP *tvp;
+	TVF *tvf;
+
+	PatchCache cachebackup;
+
+	Partial *pair;
+	bool alreadyOutputed;
+
+	Partial(Synth *synth, int debugPartialNum);
+	~Partial();
+
+	int debugGetPartialNum() const;
+	unsigned long debugGetSampleNum() const;
+
+	int getOwnerPart() const;
+	int getKey() const;
+	const Poly *getPoly() const;
+	bool isActive() const;
+	void activate(int part);
+	void deactivate(void);
+	void startPartial(const Part *part, Poly *usePoly, const PatchCache *useCache, const MemParams::RhythmTemp *rhythmTemp, Partial *pairPartial);
+	void startAbort();
+	void startDecayAll();
+	bool shouldReverb();
+	bool hasRingModulatingSlave() const;
+	bool isRingModulatingSlave() const;
+	bool isPCM() const;
+	const ControlROMPCMStruct *getControlROMPCMStruct() const;
+	Synth *getSynth() const;
+
+	// Returns true only if data written to buffer
+	// This function (unlike the one below it) returns processed stereo samples
+	// made from combining this single partial with its pair, if it has one.
+	bool produceOutput(float *leftBuf, float *rightBuf, unsigned long length);
+
+	// This function writes mono sample output to the provided buffer, and returns the number of samples written
+	unsigned long generateSamples(float *partialBuf, unsigned long length);
+};
+
+}
+
+#endif