Mercurial > repos > blastem

annotate psg.c @ 838:9a5dc22297f2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
author Michael Pavone <pavone@retrodev.com>
date Thu, 29 Oct 2015 01:06:48 -0700
parents 6a14c5a95648
children 715475788e93
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
467
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 410
diff changeset
1 /*
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 410
diff changeset
2 Copyright 2013 Michael Pavone
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
3 This file is part of BlastEm.
467
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 410
diff changeset
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.
140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
Mike Pavone <pavone@retrodev.com>
parents: 410
diff changeset
5 */
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
6 #include "psg.h"
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
7 #include "render.h"
505
b7b7a1cab44a The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
8 #include "blastem.h"
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
9 #include <string.h>
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
10 #include <stdlib.h>
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
11 #include <stdio.h>
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
12
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
13 FILE *blah;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
14
380
1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
Mike Pavone <pavone@retrodev.com>
parents: 364
diff changeset
15 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame)
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
16 {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
17 memset(context, 0, sizeof(*context));
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
18 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
19 context->back_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
380
1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
Mike Pavone <pavone@retrodev.com>
parents: 364
diff changeset
20 context->clock_inc = clock_div;
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
21 context->sample_rate = sample_rate;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
22 context->samples_frame = samples_frame;
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
23 psg_adjust_master_clock(context, master_clock);
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
24 for (int i = 0; i < 4; i++) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
25 context->volume[i] = 0xF;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
26 }
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
27 blah = fopen("psg.raw", "wb");
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
28 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
29
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
30 #define BUFFER_INC_RES 1000000000UL
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
31
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
32 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
33 {
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
34 uint64_t old_inc = context->buffer_inc;
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
35 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)context->clock_inc;
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
36 }
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
37
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
38 void psg_write(psg_context * context, uint8_t value)
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
39 {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
40 if (value & 0x80) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
41 context->latch = value & 0x70;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
42 uint8_t channel = value >> 5 & 0x3;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
43 if (value & 0x10) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
44 context->volume[channel] = value & 0xF;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
45 } else {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
46 if (channel == 3) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
47 switch(value & 0x3)
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
48 {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
49 case 0:
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
50 case 1:
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
51 case 2:
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
52 context->counter_load[3] = 0x10 << (value & 0x3);
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
53 context->noise_use_tone = 0;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
54 break;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
55 default:
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
56 context->counter_load[3] = context->counter_load[2];
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
57 context->noise_use_tone = 1;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
58 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
59 context->noise_type = value & 0x4;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
60 context->lsfr = 0x8000;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
61 } else {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
62 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
63 if (channel == 2 && context->noise_use_tone) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
64 context->counter_load[3] = context->counter_load[2];
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
65 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
66 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
67 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
68 } else {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
69 if (!(context->latch & 0x10)) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
70 uint8_t channel = context->latch >> 5 & 0x3;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
71 if (channel != 3) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
72 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
73 if (channel == 2 && context->noise_use_tone) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
74 context->counter_load[3] = context->counter_load[2];
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
75 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
76 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
77 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
78 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
79 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
80
522
6a14c5a95648 Adjust PSG and YM-2612 volume to be closer to the real console
Michael Pavone <pavone@retrodev.com>
parents: 505
diff changeset
81 #define PSG_VOL_DIV 14
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
82
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
83 //table shamelessly swiped from PSG doc from smspower.org
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
84 int16_t volume_table[16] = {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
85 32767/PSG_VOL_DIV, 26028/PSG_VOL_DIV, 20675/PSG_VOL_DIV, 16422/PSG_VOL_DIV, 13045/PSG_VOL_DIV, 10362/PSG_VOL_DIV,
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
86 8231/PSG_VOL_DIV, 6568/PSG_VOL_DIV, 5193/PSG_VOL_DIV, 4125/PSG_VOL_DIV, 3277/PSG_VOL_DIV, 2603/PSG_VOL_DIV,
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
87 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
88 };
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
89
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
90 void psg_run(psg_context * context, uint32_t cycles)
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
91 {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
92 while (context->cycles < cycles) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
93 for (int i = 0; i < 4; i++) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
94 if (context->counters[i]) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
95 context->counters[i] -= 1;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
96 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
97 if (!context->counters[i]) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
98 context->counters[i] = context->counter_load[i];
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
99 context->output_state[i] = !context->output_state[i];
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
100 if (i == 3 && context->output_state[i]) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
101 context->noise_out = context->lsfr & 1;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
102 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
103 if (context->noise_type) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
104 //white noise
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
105 if (context->lsfr & 0x40) {
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
106 context->lsfr ^= 0x8000;
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
107 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
108 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
109 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
110 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
111 }
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
112
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
113 for (int i = 0; i < 3; i++) {
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
114 if (context->output_state[i]) {
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
115 context->accum += volume_table[context->volume[i]];
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
116 }
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
117 }
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
118 if (context->noise_out) {
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
119 context->accum += volume_table[context->volume[3]];
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
120 }
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
121 context->sample_count++;
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
122
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
123 context->buffer_fraction += context->buffer_inc;
483
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
124 if (context->buffer_fraction >= BUFFER_INC_RES) {
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
125 context->buffer_fraction -= BUFFER_INC_RES;
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
126
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
127 context->audio_buffer[context->buffer_pos++] = context->accum / context->sample_count;
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
128 context->accum = context->sample_count = 0;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
129 if (context->buffer_pos == context->samples_frame) {
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
130 fwrite(context->audio_buffer, 1, context->buffer_pos, blah);
505
b7b7a1cab44a The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
131 if (!headless) {
b7b7a1cab44a The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
132 render_wait_psg(context);
b7b7a1cab44a The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
133 }
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
134 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
135 }
380
1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
Mike Pavone <pavone@retrodev.com>
parents: 364
diff changeset
136 context->cycles += context->clock_inc;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
137 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
138 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
139