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annotate psg.c @ 843:715475788e93

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Remove some debug junk from the PSG core
author Michael Pavone <pavone@retrodev.com>
date Sat, 31 Oct 2015 13:24:39 -0700
parents 9a5dc22297f2
children 252dfd29831d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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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.
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5 */
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6 #include "psg.h"
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7 #include "render.h"
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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.
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8 #include "blastem.h"
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9 #include <string.h>
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10 #include <stdlib.h>
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11 #include <stdio.h>
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12
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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.
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13 void psg_init(psg_context * context, uint32_t sample_rate, uint32_t master_clock, uint32_t clock_div, uint32_t samples_frame)
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14 {
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15 memset(context, 0, sizeof(*context));
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16 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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17 context->back_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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18 context->clock_inc = clock_div;
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19 context->sample_rate = sample_rate;
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20 context->samples_frame = samples_frame;
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21 psg_adjust_master_clock(context, master_clock);
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22 for (int i = 0; i < 4; i++) {
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23 context->volume[i] = 0xF;
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24 }
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25 }
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26
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27 #define BUFFER_INC_RES 1000000000UL
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28
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29 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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30 {
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31 uint64_t old_inc = context->buffer_inc;
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32 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)context->clock_inc;
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33 }
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34
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35 void psg_write(psg_context * context, uint8_t value)
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36 {
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37 if (value & 0x80) {
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38 context->latch = value & 0x70;
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39 uint8_t channel = value >> 5 & 0x3;
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40 if (value & 0x10) {
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41 context->volume[channel] = value & 0xF;
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42 } else {
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43 if (channel == 3) {
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44 switch(value & 0x3)
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45 {
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46 case 0:
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47 case 1:
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48 case 2:
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49 context->counter_load[3] = 0x10 << (value & 0x3);
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50 context->noise_use_tone = 0;
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51 break;
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52 default:
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53 context->counter_load[3] = context->counter_load[2];
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54 context->noise_use_tone = 1;
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55 }
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56 context->noise_type = value & 0x4;
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57 context->lsfr = 0x8000;
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58 } else {
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59 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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60 if (channel == 2 && context->noise_use_tone) {
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61 context->counter_load[3] = context->counter_load[2];
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62 }
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63 }
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64 }
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65 } else {
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66 if (!(context->latch & 0x10)) {
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67 uint8_t channel = context->latch >> 5 & 0x3;
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68 if (channel != 3) {
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69 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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70 if (channel == 2 && context->noise_use_tone) {
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71 context->counter_load[3] = context->counter_load[2];
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72 }
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73 }
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74 }
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75 }
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76 }
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77
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78 #define PSG_VOL_DIV 14
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79
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80 //table shamelessly swiped from PSG doc from smspower.org
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81 int16_t volume_table[16] = {
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82 32767/PSG_VOL_DIV, 26028/PSG_VOL_DIV, 20675/PSG_VOL_DIV, 16422/PSG_VOL_DIV, 13045/PSG_VOL_DIV, 10362/PSG_VOL_DIV,
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83 8231/PSG_VOL_DIV, 6568/PSG_VOL_DIV, 5193/PSG_VOL_DIV, 4125/PSG_VOL_DIV, 3277/PSG_VOL_DIV, 2603/PSG_VOL_DIV,
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84 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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85 };
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86
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87 void psg_run(psg_context * context, uint32_t cycles)
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88 {
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89 while (context->cycles < cycles) {
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90 for (int i = 0; i < 4; i++) {
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91 if (context->counters[i]) {
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92 context->counters[i] -= 1;
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93 }
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94 if (!context->counters[i]) {
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95 context->counters[i] = context->counter_load[i];
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96 context->output_state[i] = !context->output_state[i];
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97 if (i == 3 && context->output_state[i]) {
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98 context->noise_out = context->lsfr & 1;
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99 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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100 if (context->noise_type) {
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101 //white noise
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102 if (context->lsfr & 0x40) {
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103 context->lsfr ^= 0x8000;
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104 }
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105 }
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106 }
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107 }
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108 }
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109
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110 for (int i = 0; i < 3; i++) {
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111 if (context->output_state[i]) {
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112 context->accum += volume_table[context->volume[i]];
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113 }
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114 }
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115 if (context->noise_out) {
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116 context->accum += volume_table[context->volume[3]];
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117 }
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118 context->sample_count++;
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119
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120 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
121 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
122 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
123
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
124 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
125 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
126 if (context->buffer_pos == context->samples_frame) {
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
127 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
128 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
129 }
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
130 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
131 }
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
132 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
133 }
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