Initial commit

audio/softsynth/mt32/TVF.h

@@ -0,0 +1,61 @@
+/* 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_TVF_H
+#define MT32EMU_TVF_H
+
+#include "globals.h"
+#include "Types.h"
+#include "Structures.h"
+
+namespace MT32Emu {
+
+class LA32Ramp;
+class Partial;
+
+class TVF {
+private:
+	const Partial * const partial;
+	LA32Ramp *cutoffModifierRamp;
+	const TimbreParam::PartialParam *partialParam;
+
+	Bit8u baseCutoff;
+	int keyTimeSubtraction;
+	unsigned int levelMult;
+
+	Bit8u target;
+	unsigned int phase;
+
+	void startRamp(Bit8u newTarget, Bit8u newIncrement, int newPhase);
+	void nextPhase();
+
+public:
+	TVF(const Partial *partial, LA32Ramp *cutoffModifierRamp);
+	void reset(const TimbreParam::PartialParam *partialParam, Bit32u basePitch);
+	// Returns the base cutoff (without envelope modification).
+	// The base cutoff is calculated when reset() is called and remains static
+	// for the lifetime of the partial.
+	// Barring bugs, the number returned is confirmed accurate
+	// (based on specs from Mok).
+	Bit8u getBaseCutoff() const;
+	void handleInterrupt();
+	void startDecay();
+}; // class TVF
+
+} // namespace MT32Emu
+
+#endif // #ifndef MT32EMU_TVF_H