blob: 5a97e184f72f00aaf654d70a0aaa847e699fd14e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
/*
Copyright 2013 Michael Pavone
This file is part of BlastEm.
BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
*/
#ifndef PSG_CONTEXT_H_
#define PSG_CONTEXT_H_
#include <stdint.h>
typedef struct {
int16_t *audio_buffer;
int16_t *back_buffer;
uint64_t buffer_fraction;
uint64_t buffer_inc;
uint32_t buffer_pos;
uint32_t clock_inc;
uint32_t cycles;
uint32_t sample_rate;
uint32_t samples_frame;
int32_t lowpass_alpha;
uint16_t lsfr;
uint16_t counter_load[4];
uint16_t counters[4];
int16_t accum;
int16_t last_sample;
uint8_t volume[4];
uint8_t output_state[4];
uint8_t noise_out;
uint8_t noise_use_tone;
uint8_t noise_type;
uint8_t latch;
} psg_context;
void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame);
void psg_free(psg_context *context);
void psg_adjust_master_clock(psg_context * context, uint32_t master_clock);
void psg_write(psg_context * context, uint8_t value);
void psg_run(psg_context * context, uint32_t cycles);
#endif //PSG_CONTEXT_H_
|
