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annotate ym2612.h @ 451:b7c3b2d22858

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Added support for saving savestates. Added gst savestate format test harness
author Mike Pavone <pavone@retrodev.com>
date Fri, 26 Jul 2013 19:55:04 -0700
parents 7e8e179116af
children 140af5509ce7
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1 #ifndef YM2612_H_
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2 #define YM2612_H_
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3
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4 #include <stdint.h>
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5 #include <stdio.h>
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6
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7 #define NUM_PART_REGS (0xB7-0x30)
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8 #define NUM_CHANNELS 6
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9 #define NUM_OPERATORS (4*NUM_CHANNELS)
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10
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11 #define YM_OPT_WAVE_LOG 1
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12
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13 typedef struct {
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14 uint32_t phase_inc;
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15 uint32_t phase_counter;
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16 uint16_t envelope;
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17 int16_t output;
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18 uint16_t total_level;
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19 uint16_t sustain_level;
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20 uint8_t rates[4];
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21 uint8_t key_scaling;
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22 uint8_t multiple;
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23 uint8_t detune;
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24 uint8_t env_phase;
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25 } ym_operator;
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26
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27 typedef struct {
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28 FILE * logfile;
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29 uint16_t fnum;
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30 int16_t output;
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31 uint8_t block_fnum_latch;
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32 uint8_t block;
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33 uint8_t keycode;
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34 uint8_t algorithm;
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35 uint8_t feedback;
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36 uint8_t ams;
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37 uint8_t pms;
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38 uint8_t lr;
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39 } ym_channel;
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40
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41 typedef struct {
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42 uint16_t fnum;
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43 uint8_t block;
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44 uint8_t block_fnum_latch;
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45 uint8_t keycode;
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46 } ym_supp;
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47
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48 #define YM_PART1_START 0x21
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49 #define YM_PART2_START 0x30
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50 #define YM_REG_END 0xB8
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51 #define YM_PART1_REGS (YM_REG_END-YM_PART1_START)
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52 #define YM_PART2_REGS (YM_REG_END-YM_PART2_START)
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53
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54 typedef struct {
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55 int16_t *audio_buffer;
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56 int16_t *back_buffer;
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57 double buffer_fraction;
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58 double buffer_inc;
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59 uint32_t clock_inc;
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60 uint32_t buffer_pos;
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61 uint32_t sample_limit;
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62 uint32_t current_cycle;
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63 uint32_t write_cycle;
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64 ym_operator operators[NUM_OPERATORS];
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65 ym_channel channels[NUM_CHANNELS];
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66 uint16_t timer_a;
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67 uint16_t timer_a_load;
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68 uint16_t timer_b;
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69 uint16_t timer_b_load;
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70 uint16_t env_counter;
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71 ym_supp ch3_supp[3];
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72 uint8_t ch3_mode;
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73 uint8_t current_op;
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74 uint8_t current_env_op;
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75
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76 uint8_t timer_control;
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77 uint8_t dac_enable;
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78 uint8_t lfo_enable;
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79 uint8_t lfo_freq;
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80 uint8_t lfo_counter;
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81 uint8_t lfo_am_step;
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82 uint8_t lfo_pm_step;
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83 uint8_t status;
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84 uint8_t selected_reg;
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85 uint8_t selected_part;
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86 uint8_t part1_regs[YM_PART1_REGS];
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87 uint8_t part2_regs[YM_PART2_REGS];
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88 } ym2612_context;
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89
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90 void ym_init(ym2612_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t sample_limit, uint32_t options);
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91 void ym_run(ym2612_context * context, uint32_t to_cycle);
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92 void ym_address_write_part1(ym2612_context * context, uint8_t address);
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93 void ym_address_write_part2(ym2612_context * context, uint8_t address);
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94 void ym_data_write(ym2612_context * context, uint8_t value);
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95 uint8_t ym_read_status(ym2612_context * context);
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96 uint8_t ym_load_gst(ym2612_context * context, FILE * gstfile);
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97 uint8_t ym_save_gst(ym2612_context * context, FILE * gstfile);
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99 #endif //YM2612_H_
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100