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93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*/
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#ifndef SOUND_SOFTSYNTH_CMS_H
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#define SOUND_SOFTSYNTH_CMS_H
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#include "common/scummsys.h"
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/* this structure defines a channel */
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struct saa1099_channel {
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int frequency; /* frequency (0x00..0xff) */
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int freq_enable; /* frequency enable */
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int noise_enable; /* noise enable */
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int octave; /* octave (0x00..0x07) */
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int amplitude[2]; /* amplitude (0x00..0x0f) */
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int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */
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/* vars to simulate the square wave */
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double counter;
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double freq;
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int level;
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};
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/* this structure defines a noise channel */
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struct saa1099_noise {
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/* vars to simulate the noise generator output */
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double counter;
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double freq;
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int level; /* noise polynomal shifter */
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};
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/* this structure defines a SAA1099 chip */
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struct SAA1099 {
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int stream; /* our stream */
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int noise_params[2]; /* noise generators parameters */
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int env_enable[2]; /* envelope generators enable */
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int env_reverse_right[2]; /* envelope reversed for right channel */
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int env_mode[2]; /* envelope generators mode */
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int env_bits[2]; /* non zero = 3 bits resolution */
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int env_clock[2]; /* envelope clock mode (non-zero external) */
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int env_step[2]; /* current envelope step */
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int all_ch_enable; /* all channels enable */
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int sync_state; /* sync all channels */
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int selected_reg; /* selected register */
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struct saa1099_channel channels[6]; /* channels */
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struct saa1099_noise noise[2]; /* noise generators */
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};
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class CMSEmulator {
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public:
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CMSEmulator(uint32 sampleRate) {
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_sampleRate = sampleRate;
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memset(_saa1099, 0, sizeof(SAA1099)*2);
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}
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~CMSEmulator() { }
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void portWrite(int port, int val);
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void readBuffer(int16 *buffer, const int numSamples);
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private:
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uint32 _sampleRate;
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SAA1099 _saa1099[2];
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void envelope(int chip, int ch);
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void update(int chip, int16 *buffer, int length);
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void portWriteIntern(int chip, int offset, int data);
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};
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#endif
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