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audio/softsynth/mt32/LA32Ramp.h

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+/* 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_LA32RAMP_H
+#define MT32EMU_LA32RAMP_H
+
+#include "globals.h"
+#include "Types.h"
+
+namespace MT32Emu {
+
+class LA32Ramp {
+private:
+	Bit32u current;
+	unsigned int largeTarget;
+	unsigned int largeIncrement;
+	bool descending;
+
+	int interruptCountdown;
+	bool interruptRaised;
+
+public:
+	LA32Ramp();
+	void startRamp(Bit8u target, Bit8u increment);
+	Bit32u nextValue();
+	bool checkInterrupt();
+	void reset();
+	bool isBelowCurrent(Bit8u target) const;
+};
+
+} // namespace MT32Emu
+
+#endif // #ifndef MT32EMU_LA32RAMP_H