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src/mt32/LA32Ramp.h
00001 /* Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Dean Beeler, Jerome Fisher
00002  * Copyright (C) 2011, 2012, 2013 Dean Beeler, Jerome Fisher, Sergey V. Mikayev
00003  *
00004  *  This program is free software: you can redistribute it and/or modify
00005  *  it under the terms of the GNU Lesser General Public License as published by
00006  *  the Free Software Foundation, either version 2.1 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  This program is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU Lesser General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Lesser General Public License
00015  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 #ifndef MT32EMU_LA32RAMP_H
00019 #define MT32EMU_LA32RAMP_H
00020 
00021 namespace MT32Emu {
00022 
00023 class LA32Ramp {
00024 private:
00025         Bit32u current;
00026         unsigned int largeTarget;
00027         unsigned int largeIncrement;
00028         bool descending;
00029 
00030         int interruptCountdown;
00031         bool interruptRaised;
00032 
00033 public:
00034         LA32Ramp();
00035         void startRamp(Bit8u target, Bit8u increment);
00036         Bit32u nextValue();
00037         bool checkInterrupt();
00038         void reset();
00039 
00040         void saveState( std::ostream &stream );
00041         void loadState( std::istream &stream );
00042 };
00043 
00044 }
00045 
00046 #endif /* TVA_H_ */