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annotate psg.c @ 2081:cfd53c94fffb

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Initial stab at RF5C164 emulation
author Michael Pavone <pavone@retrodev.com>
date Thu, 03 Feb 2022 23:15:42 -0800
parents c3c62dbf1ceb
children 2648081f3100
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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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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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7 #include "blastem.h"
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8 #include "event_log.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 #include <math.h>
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13 void psg_init(psg_context * context, uint32_t master_clock, uint32_t clock_div)
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14 {
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15 memset(context, 0, sizeof(*context));
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16 context->audio = render_audio_source("PSG", master_clock, clock_div, 1);
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17 context->clock_inc = clock_div;
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18 for (int i = 0; i < 4; i++) {
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19 context->volume[i] = 0xF;
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20 }
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21 }
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22
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23 void psg_free(psg_context *context)
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24 {
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25 render_free_source(context->audio);
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26 free(context);
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27 }
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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 render_audio_adjust_clock(context->audio, master_clock, context->clock_inc);
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32 }
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33
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34 void psg_write(psg_context * context, uint8_t value)
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35 {
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36 if (context->vgm) {
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37 vgm_sn76489_write(context->vgm, context->cycles, value);
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38 }
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39 event_log(EVENT_PSG_REG, context->cycles, sizeof(value), &value);
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40 if (value & 0x80) {
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41 context->latch = value & 0x70;
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42 uint8_t channel = value >> 5 & 0x3;
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43 if (value & 0x10) {
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44 context->volume[channel] = value & 0xF;
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45 } else {
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46 if (channel == 3) {
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47 switch(value & 0x3)
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48 {
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49 case 0:
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50 case 1:
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51 case 2:
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52 context->counter_load[3] = 0x10 << (value & 0x3);
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53 context->noise_use_tone = 0;
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54 break;
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55 default:
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56 context->counter_load[3] = context->counter_load[2];
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57 context->noise_use_tone = 1;
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58 }
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59 context->noise_type = value & 0x4;
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60 context->lsfr = 0x8000;
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61 } else {
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62 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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63 if (channel == 2 && context->noise_use_tone) {
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64 context->counter_load[3] = context->counter_load[2];
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65 }
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66 }
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67 }
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68 } else {
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69 if (!(context->latch & 0x10)) {
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70 uint8_t channel = context->latch >> 5 & 0x3;
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71 if (channel != 3) {
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72 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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73 if (channel == 2 && context->noise_use_tone) {
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74 context->counter_load[3] = context->counter_load[2];
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75 }
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76 }
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77 }
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78 }
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79 }
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80
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81 #define PSG_VOL_DIV 14
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82
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83 //table shamelessly swiped from PSG doc from smspower.org
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84 static int16_t volume_table[16] = {
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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,
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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,
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87 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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88 };
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89
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90 void psg_run(psg_context * context, uint32_t cycles)
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91 {
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92 while (context->cycles < cycles) {
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93 for (int i = 0; i < 4; i++) {
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94 if (context->counters[i]) {
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95 context->counters[i] -= 1;
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96 }
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97 if (!context->counters[i]) {
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98 context->counters[i] = context->counter_load[i];
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99 context->output_state[i] = !context->output_state[i];
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100 if (i == 3 && context->output_state[i]) {
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101 context->noise_out = context->lsfr & 1;
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102 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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103 if (context->noise_type) {
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104 //white noise
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105 if (context->lsfr & 0x40) {
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106 context->lsfr ^= 0x8000;
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107 }
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108 }
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109 }
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110 }
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111 }
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112
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113 int16_t accum = 0;
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114
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115 for (int i = 0; i < 3; i++) {
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116 if (context->output_state[i]) {
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117 accum += volume_table[context->volume[i]];
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118 }
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119 }
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120 if (context->noise_out) {
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121 accum += volume_table[context->volume[3]];
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122 }
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123
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124 render_put_mono_sample(context->audio, accum);
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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parents: 522
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125
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.
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parents: 364
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126 context->cycles += context->clock_inc;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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127 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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128 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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129
1909
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
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130 void psg_vgm_log(psg_context *context, uint32_t master_clock, vgm_writer *vgm)
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parents: 1865
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131 {
1911
f2ed8df7a002 Fix PSG frequency written to VGM header when logging
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parents: 1909
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132 vgm_sn76489_init(vgm, 16 * master_clock / context->clock_inc, 9, 16, 0);
1909
508522f08e4d Initial stab at VGM logging support
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parents: 1865
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133 context->vgm = vgm;
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parents: 1865
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134 for (int chan = 0; chan < 4; chan++)
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135 {
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parents: 1865
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136 uint8_t base = chan << 5 | 0x80;
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parents: 1865
diff changeset
137 vgm_sn76489_write(context->vgm, context->cycles, context->volume[chan] | base | 0x10);
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parents: 1865
diff changeset
138 if (chan == 3) {
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parents: 1865
diff changeset
139 if (context->noise_use_tone) {
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parents: 1865
diff changeset
140 vgm_sn76489_write(context->vgm, context->cycles, 3 | base);
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Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
141 } else {
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Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
142 //0x10 = 0
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
143 //0x20 = 1
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
144 //0x40 = 2
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
145 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 5 | base);
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
146 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
147 } else {
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
148 vgm_sn76489_write(context->vgm, context->cycles, (context->counter_load[chan] & 0xF) | base);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
149 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 4 & 0x3F);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
150 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
151 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
152 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
153
1427
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
154 void psg_serialize(psg_context *context, serialize_buffer *buf)
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
155 {
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
156 save_int16(buf, context->lsfr);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
157 save_buffer16(buf, context->counter_load, 4);
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parents: 1356
diff changeset
158 save_buffer16(buf, context->counters, 4);
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
159 save_buffer8(buf, context->volume, 4);
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
160 uint8_t output_state = context->output_state[0] << 3 | context->output_state[1] << 2
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parents: 1356
diff changeset
161 | context->output_state[2] << 1 | context->output_state[3]
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parents: 1356
diff changeset
162 | context->noise_use_tone << 4;
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parents: 1356
diff changeset
163 save_int8(buf, output_state);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
164 save_int8(buf, context->noise_type);
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
165 save_int8(buf, context->latch);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
166 save_int32(buf, context->cycles);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
167 }
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
168
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parents: 1356
diff changeset
169 void psg_deserialize(deserialize_buffer *buf, void *vcontext)
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
170 {
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
171 psg_context *context = vcontext;
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
172 context->lsfr = load_int16(buf);
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
173 load_buffer16(buf, context->counter_load, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
174 load_buffer16(buf, context->counters, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
175 load_buffer8(buf, context->volume, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
176 uint8_t output_state = load_int8(buf);
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
177 context->output_state[0] = output_state >> 3 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
178 context->output_state[1] = output_state >> 2 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
179 context->output_state[2] = output_state >> 1 & 1;
1427
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
180 context->output_state[3] = output_state & 1;
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
181 context->noise_use_tone = output_state >> 4 & 1;
1427
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
182 context->noise_type = load_int8(buf);
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
183 context->latch = load_int8(buf);
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Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
184 context->cycles = load_int32(buf);
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parents: 1356
diff changeset
185 }