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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
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2557:75dd7536c467 2558:3f58fec775df
1 #ifndef YMF262_H_
2 #define YMF262_H_
3
4 #include "ym_common.h"
5 #include "render_audio.h"
6 #include "vgm.h"
7 #include "oscilloscope.h"
8
9 #define OPL3_NUM_CHANNELS 18
10 #define OPL3_NUM_OPERATORS (2*OPL3_NUM_CHANNELS)
11 #define OPL3_PARAM_START 0x20
12 #define OPL3_PARAM_END 0xF6
13 #define OPL3_PARAM_REGS (OPL3_PARAM_END - OPL3_PARAM_START)
14
15 typedef struct {
16 audio_source *audio;
17 vgm_writer *vgm;
18 oscilloscope *scope;
19 uint32_t clock_inc;
20 uint32_t cycle;
21 int32_t volume_mult;
22 int32_t volume_div;
23 ym_operator operators[OPL3_NUM_OPERATORS];
24 ym_channel channels[OPL3_NUM_CHANNELS];
25 uint8_t part1_regs[OPL3_PARAM_REGS];
26 uint8_t part2_regs[OPL3_PARAM_REGS];
27 uint8_t timer_test[4];
28 uint8_t nts;
29 uint8_t connection_sel;
30 uint8_t opl3_mode;
31 uint8_t part2_test;
32 uint8_t status;
33 uint8_t current_op;
34 uint8_t selected_reg;
35 uint8_t selected_part;
36 } ymf262_context;
37
38 void ymf262_init(ymf262_context *context, uint32_t master_clock, uint32_t clock_div, uint32_t options);
39 void ymf262_reset(ymf262_context *context);
40 void ymf262_free(ymf262_context *context);
41 void ymf262_adjust_master_clock(ymf262_context *context, uint32_t master_clock);
42 void ymf262_adjust_cycles(ymf262_context *context, uint32_t deduction);
43 void ymf262_run(ymf262_context *context, uint32_t to_cycle);
44 void ymf262_address_write_part1(ymf262_context *context, uint8_t address);
45 void ymf262_address_write_part2(ymf262_context *context, uint8_t address);
46 void ymf262_data_write(ymf262_context *context, uint8_t value);
47 void ymf262_vgm_log(ymf262_context *context, uint32_t master_clock, vgm_writer *vgm);
48 uint8_t ymf262_read_status(ymf262_context *context, uint32_t cycle, uint32_t port);
49
50
51 #endif // YMF262_H_