1 files changed, 0 insertions, 347 deletions
diff --git a/audio/softsynth/mt32/LegacyWaveGenerator.cpp b/audio/softsynth/mt32/LegacyWaveGenerator.cpp
deleted file mode 100644
index 35ca975018..0000000000
--- a/audio/softsynth/mt32/LegacyWaveGenerator.cpp
+++ /dev/null
@@ -1,347 +0,0 @@
-/* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
- * Copyright (C) 2011, 2012, 2013 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/>.
- */
-
-//#include <cmath>
-#include "mt32emu.h"
-#include "mmath.h"
-#include "LegacyWaveGenerator.h"
-
-#if MT32EMU_ACCURATE_WG == 1
-
-namespace MT32Emu {
-
-static const float MIDDLE_CUTOFF_VALUE = 128.0f;
-static const float RESONANCE_DECAY_THRESHOLD_CUTOFF_VALUE = 144.0f;
-static const float MAX_CUTOFF_VALUE = 240.0f;
-
-float LA32WaveGenerator::getPCMSample(unsigned int position) {
-	if (position >= pcmWaveLength) {
-		if (!pcmWaveLooped) {
-			return 0;
-		}
-		position = position % pcmWaveLength;
-	}
-	Bit16s pcmSample = pcmWaveAddress[position];
-	float sampleValue = EXP2F(((pcmSample & 32767) - 32787.0f) / 2048.0f);
-	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;
-
-	wavePos = 0.0f;
-	lastFreq = 0.0f;
-
-	pcmWaveAddress = NULL;
-	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;
-
-	pcmPosition = 0.0f;
-	active = true;
-}
-
-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:
-	// (1) Tested with a single partial playing PCM wave 77 with pitchCoarse 36 and no keyfollow, velocity follow, etc.
-	// This gives results within +/- 2 at the output (before any DAC bitshifting)
-	// when sustaining at levels 156 - 255 with no modifiers.
-	// (2) Tested with a special square wave partial (internal capture ID tva5) at TVA envelope levels 155-255.
-	// This gives deltas between -1 and 0 compared to the real output. Note that this special partial only produces
-	// positive amps, so negative still needs to be explored, as well as lower levels.
-	//
-	// Also still partially unconfirmed is the behaviour when ramping between levels, as well as the timing.
-
-	float amp = EXP2F(ampVal / -1024.0f / 4096.0f);
-	float freq = EXP2F(pitch / 4096.0f - 16.0f) * SAMPLE_RATE;
-
-	if (isPCMWave()) {
-		// Render PCM waveform
-		int len = pcmWaveLength;
-		int intPCMPosition = (int)pcmPosition;
-		if (intPCMPosition >= len && !pcmWaveLooped) {
-			// We're now past the end of a non-looping PCM waveform so it's time to die.
-			deactivate();
-			return 0.0f;
-		}
-		float positionDelta = freq * 2048.0f / SAMPLE_RATE;
-
-		// Linear interpolation
-		float firstSample = getPCMSample(intPCMPosition);
-		// We observe that for partial structures with ring modulation the interpolation is not applied to the slave PCM partial.
-		// It's assumed that the multiplication circuitry intended to perform the interpolation on the slave PCM partial
-		// is borrowed by the ring modulation circuit (or the LA32 chip has a similar lack of resources assigned to each partial pair).
-		if (pcmWaveInterpolated) {
-			sample = firstSample + (getPCMSample(intPCMPosition + 1) - firstSample) * (pcmPosition - intPCMPosition);
-		} else {
-			sample = firstSample;
-		}
-
-		float newPCMPosition = pcmPosition + positionDelta;
-		if (pcmWaveLooped) {
-			newPCMPosition = fmod(newPCMPosition, (float)pcmWaveLength);
-		}
-		pcmPosition = newPCMPosition;
-	} else {
-		// Render synthesised waveform
-		wavePos *= lastFreq / freq;
-		lastFreq = freq;
-
-		float resAmp = EXP2F(1.0f - (32 - resonance) / 4.0f);
-		{
-			//static const float resAmpFactor = EXP2F(-7);
-			//resAmp = EXP2I(resonance << 10) * resAmpFactor;
-		}
-
-		// The cutoffModifier may not be supposed to be directly added to the cutoff -
-		// it may for example need to be multiplied in some way.
-		// The 240 cutoffVal limit was determined via sample analysis (internal Munt capture IDs: glop3, glop4).
-		// More research is needed to be sure that this is correct, however.
-		float cutoffVal = cutoffRampVal / 262144.0f;
-		if (cutoffVal > MAX_CUTOFF_VALUE) {
-			cutoffVal = MAX_CUTOFF_VALUE;
-		}
-
-		// Wave length in samples
-		float waveLen = SAMPLE_RATE / freq;
-
-		// Init cosineLen
-		float cosineLen = 0.5f * waveLen;
-		if (cutoffVal > MIDDLE_CUTOFF_VALUE) {
-			cosineLen *= EXP2F((cutoffVal - MIDDLE_CUTOFF_VALUE) / -16.0f); // found from sample analysis
-		}
-
-		// Start playing in center of first cosine segment
-		// relWavePos is shifted by a half of cosineLen
-		float relWavePos = wavePos + 0.5f * cosineLen;
-		if (relWavePos > waveLen) {
-			relWavePos -= waveLen;
-		}
-
-		// Ratio of positive segment to wave length
-		float pulseLen = 0.5f;
-		if (pulseWidth > 128) {
-			pulseLen = EXP2F((64 - pulseWidth) / 64.0f);
-			//static const float pulseLenFactor = EXP2F(-192 / 64);
-			//pulseLen = EXP2I((256 - pulseWidthVal) << 6) * pulseLenFactor;
-		}
-		pulseLen *= waveLen;
-
-		float hLen = pulseLen - cosineLen;
-
-		// Ignore pulsewidths too high for given freq
-		if (hLen < 0.0f) {
-			hLen = 0.0f;
-		}
-
-		// Ignore pulsewidths too high for given freq and cutoff
-		float lLen = waveLen - hLen - 2 * cosineLen;
-		if (lLen < 0.0f) {
-			lLen = 0.0f;
-		}
-
-		// Correct resAmp for cutoff in range 50..66
-		if ((cutoffVal >= 128.0f) && (cutoffVal < 144.0f)) {
-			resAmp *= sin(FLOAT_PI * (cutoffVal - 128.0f) / 32.0f);
-		}
-
-		// Produce filtered square wave with 2 cosine waves on slopes
-
-		// 1st cosine segment
-		if (relWavePos < cosineLen) {
-			sample = -cos(FLOAT_PI * relWavePos / cosineLen);
-		} else
-
-		// high linear segment
-		if (relWavePos < (cosineLen + hLen)) {
-			sample = 1.f;
-		} else
-
-		// 2nd cosine segment
-		if (relWavePos < (2 * cosineLen + hLen)) {
-			sample = cos(FLOAT_PI * (relWavePos - (cosineLen + hLen)) / cosineLen);
-		} else {
-
-		// low linear segment
-			sample = -1.f;
-		}
-
-		if (cutoffVal < 128.0f) {
-
-			// Attenuate samples below cutoff 50
-			// Found by sample analysis
-			sample *= EXP2F(-0.125f * (128.0f - cutoffVal));
-		} else {
-
-			// Add resonance sine. Effective for cutoff > 50 only
-			float resSample = 1.0f;
-
-			// Resonance decay speed factor
-			float resAmpDecayFactor = Tables::getInstance().resAmpDecayFactor[resonance >> 2];
-
-			// Now relWavePos counts from the middle of first cosine
-			relWavePos = wavePos;
-
-			// negative segments
-			if (!(relWavePos < (cosineLen + hLen))) {
-				resSample = -resSample;
-				relWavePos -= cosineLen + hLen;
-
-				// From the digital captures, the decaying speed of the resonance sine is found a bit different for the positive and the negative segments
-				resAmpDecayFactor += 0.25f;
-			}
-
-			// Resonance sine WG
-			resSample *= sin(FLOAT_PI * relWavePos / cosineLen);
-
-			// Resonance sine amp
-			float resAmpFadeLog2 = -0.125f * resAmpDecayFactor * (relWavePos / cosineLen); // seems to be exact
-			float resAmpFade = EXP2F(resAmpFadeLog2);
-
-			// Now relWavePos set negative to the left from center of any cosine
-			relWavePos = wavePos;
-
-			// negative segment
-			if (!(wavePos < (waveLen - 0.5f * cosineLen))) {
-				relWavePos -= waveLen;
-			} else
-
-			// positive segment
-			if (!(wavePos < (hLen + 0.5f * cosineLen))) {
-				relWavePos -= cosineLen + hLen;
-			}
-
-			// To ensure the output wave has no breaks, two different windows are appied to the beginning and the ending of the resonance sine segment
-			if (relWavePos < 0.5f * cosineLen) {
-				float syncSine = sin(FLOAT_PI * relWavePos / cosineLen);
-				if (relWavePos < 0.0f) {
-					// The window is synchronous square sine here
-					resAmpFade *= syncSine * syncSine;
-				} else {
-					// The window is synchronous sine here
-					resAmpFade *= syncSine;
-				}
-			}
-
-			sample += resSample * resAmp * resAmpFade;
-		}
-
-		// sawtooth waves
-		if (sawtoothWaveform) {
-			sample *= cos(FLOAT_2PI * wavePos / waveLen);
-		}
-
-		wavePos++;
-
-		// wavePos isn't supposed to be > waveLen
-		if (wavePos > waveLen) {
-			wavePos -= waveLen;
-		}
-	}
-
-	// Multiply sample with current TVA value
-	sample *= amp;
-	return sample;
-}
-
-void LA32WaveGenerator::deactivate() {
-	active = false;
-}
-
-bool LA32WaveGenerator::isActive() const {
-	return active;
-}
-
-bool LA32WaveGenerator::isPCMWave() const {
-	return pcmWaveAddress != NULL;
-}
-
-void LA32PartialPair::init(const bool ringModulated, const bool mixed) {
-	this->ringModulated = ringModulated;
-	this->mixed = mixed;
-	masterOutputSample = 0.0f;
-	slaveOutputSample = 0.0f;
-}
-
-void LA32PartialPair::initSynth(const PairType useMaster, const bool sawtoothWaveform, const Bit8u pulseWidth, const Bit8u resonance) {
-	if (useMaster == MASTER) {
-		master.initSynth(sawtoothWaveform, pulseWidth, resonance);
-	} else {
-		slave.initSynth(sawtoothWaveform, pulseWidth, resonance);
-	}
-}
-
-void LA32PartialPair::initPCM(const PairType useMaster, const Bit16s *pcmWaveAddress, const Bit32u pcmWaveLength, const bool pcmWaveLooped) {
-	if (useMaster == MASTER) {
-		master.initPCM(pcmWaveAddress, pcmWaveLength, pcmWaveLooped, true);
-	} else {
-		slave.initPCM(pcmWaveAddress, pcmWaveLength, pcmWaveLooped, !ringModulated);
-	}
-}
-
-void LA32PartialPair::generateNextSample(const PairType useMaster, const Bit32u amp, const Bit16u pitch, const Bit32u cutoff) {
-	if (useMaster == MASTER) {
-		masterOutputSample = master.generateNextSample(amp, pitch, cutoff);
-	} else {
-		slaveOutputSample = slave.generateNextSample(amp, pitch, cutoff);
-	}
-}
-
-Bit16s LA32PartialPair::nextOutSample() {
-	float outputSample;
-	if (ringModulated) {
-		float ringModulatedSample = masterOutputSample * slaveOutputSample;
-		outputSample = mixed ? masterOutputSample + ringModulatedSample : ringModulatedSample;
-	} else {
-		outputSample = masterOutputSample + slaveOutputSample;
-	}
-	return Bit16s(outputSample * 8192.0f);
-}
-
-void LA32PartialPair::deactivate(const PairType useMaster) {
-	if (useMaster == MASTER) {
-		master.deactivate();
-		masterOutputSample = 0.0f;
-	} else {
-		slave.deactivate();
-		slaveOutputSample = 0.0f;
-	}
-}
-
-bool LA32PartialPair::isActive(const PairType useMaster) const {
-	return useMaster == MASTER ? master.isActive() : slave.isActive();
-}
-
-}
-
-#endif // #if MT32EMU_ACCURATE_WG == 1