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annotate ym_common.h @ 2558:3f58fec775df

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Initial work on YMF262 (aka OPL3) emulation
author Michael Pavone <pavone@retrodev.com>
date Sun, 19 Jan 2025 00:31:16 -0800
parents
children eb588f22ec76
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2558
3f58fec775df Initial work on YMF262 (aka OPL3) emulation
Michael Pavone <pavone@retrodev.com>
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1 #ifndef YM_COMMON_H_
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2 #define YM_COMMON_H_
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3 #include <stdint.h>
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4 #include <stdio.h>
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5
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6 #define MAX_ENVELOPE 0xFFC
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7 #define MAX_OPL_ENVELOPE 0xFF8
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8
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9 typedef struct {
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10 int16_t *mod_src[2];
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11 uint32_t phase_counter;
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12 uint32_t phase_inc;
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13 uint16_t envelope;
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14 int16_t output;
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15 uint16_t total_level;
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16 uint16_t sustain_level;
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17 uint8_t rates[4];
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18 uint8_t key_scaling;
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19 uint8_t multiple;
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20 uint8_t detune;
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21 uint8_t am;
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22 uint8_t env_phase;
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23 uint8_t ssg;
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24 uint8_t inverted;
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25 uint8_t phase_overflow;
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26 } ym_operator;
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27
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28 typedef struct {
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29 FILE * logfile;
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30 uint16_t fnum;
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31 int16_t output;
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32 int16_t op1_old;
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33 int16_t op2_old;
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34 uint8_t block_fnum_latch;
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35 uint8_t block;
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36 uint8_t keycode;
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37 uint8_t algorithm;
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38 uint8_t feedback;
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39 uint8_t ams;
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40 uint8_t pms;
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41 uint8_t lr;
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42 uint8_t keyon;
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43 uint8_t scope_channel;
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44 uint8_t phase_overflow;
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45 } ym_channel;
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46
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47 extern int16_t lfo_pm_table[128 * 32 * 8];
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48 extern uint16_t rate_table[64*8];
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49
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50 void ym_init_tables(void);
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51 int16_t ym_sine(uint16_t phase, int16_t mod, uint16_t env);
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52 int16_t ym_opl_wave(uint16_t phase, int16_t mod, uint16_t env, uint8_t waveform);
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53
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54 #endif //YM_COMMON_H_