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comparison psg.h @ 483:3e1573fa22cf

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Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
author Mike Pavone <pavone@retrodev.com>
date Tue, 01 Oct 2013 23:51:16 -0700
parents 140af5509ce7
children 9a5dc22297f2
comparison
equal deleted inserted replaced
482:4b24260125f3 483:3e1573fa22cf
1 /* 1 /*
2 Copyright 2013 Michael Pavone 2 Copyright 2013 Michael Pavone
3 This file is part of BlastEm. 3 This file is part of BlastEm.
4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. 4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
5 */ 5 */
6 #ifndef PSG_CONTEXT_H_ 6 #ifndef PSG_CONTEXT_H_
7 #define PSG_CONTEXT_H_ 7 #define PSG_CONTEXT_H_
8 8
9 #include <stdint.h> 9 #include <stdint.h>
10 10
11 typedef struct { 11 typedef struct {
12 int16_t *audio_buffer; 12 int16_t *audio_buffer;
13 int16_t *back_buffer; 13 int16_t *back_buffer;
14 double buffer_fraction; 14 uint64_t buffer_fraction;
15 double buffer_inc; 15 uint64_t buffer_inc;
16 uint32_t buffer_pos; 16 uint32_t buffer_pos;
17 uint32_t clock_inc; 17 uint32_t clock_inc;
18 uint32_t cycles; 18 uint32_t cycles;
19 uint32_t sample_rate;
19 uint32_t samples_frame; 20 uint32_t samples_frame;
20 uint16_t lsfr; 21 uint16_t lsfr;
21 uint16_t counter_load[4]; 22 uint16_t counter_load[4];
22 uint16_t counters[4]; 23 uint16_t counters[4];
23 uint8_t volume[4]; 24 uint8_t volume[4];
28 uint8_t latch; 29 uint8_t latch;
29 } psg_context; 30 } psg_context;
30 31
31 32
32 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame); 33 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame);
34 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock);
33 void psg_write(psg_context * context, uint8_t value); 35 void psg_write(psg_context * context, uint8_t value);
34 void psg_run(psg_context * context, uint32_t cycles); 36 void psg_run(psg_context * context, uint32_t cycles);
35 37
36 #endif //PSG_CONTEXT_H_ 38 #endif //PSG_CONTEXT_H_
37 39