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annotate psg.c @ 2196:2648081f3100

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Implement Game Gear PSG panning
author Michael Pavone <pavone@retrodev.com>
date Sun, 21 Aug 2022 23:14:08 -0700
parents cfd53c94fffb
children 71b0cb7c34a6
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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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, 2);
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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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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 context->pan = 0xFF;
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22 }
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23
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24 void psg_free(psg_context *context)
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25 {
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26 render_free_source(context->audio);
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27 free(context);
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28 }
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29
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30 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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31 {
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32 render_audio_adjust_clock(context->audio, master_clock, 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 (context->vgm) {
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38 vgm_sn76489_write(context->vgm, context->cycles, value);
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39 }
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40 event_log(EVENT_PSG_REG, context->cycles, sizeof(value), &value);
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41 if (value & 0x80) {
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42 context->latch = value & 0x70;
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43 uint8_t channel = value >> 5 & 0x3;
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44 if (value & 0x10) {
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45 context->volume[channel] = value & 0xF;
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46 } else {
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47 if (channel == 3) {
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48 switch(value & 0x3)
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49 {
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50 case 0:
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51 case 1:
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52 case 2:
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53 context->counter_load[3] = 0x10 << (value & 0x3);
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54 context->noise_use_tone = 0;
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55 break;
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56 default:
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57 context->counter_load[3] = context->counter_load[2];
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58 context->noise_use_tone = 1;
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59 }
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60 context->noise_type = value & 0x4;
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61 context->lsfr = 0x8000;
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62 } else {
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63 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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64 if (channel == 2 && context->noise_use_tone) {
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65 context->counter_load[3] = context->counter_load[2];
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66 }
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67 }
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68 }
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69 } else {
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70 if (!(context->latch & 0x10)) {
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71 uint8_t channel = context->latch >> 5 & 0x3;
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72 if (channel != 3) {
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73 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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74 if (channel == 2 && context->noise_use_tone) {
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75 context->counter_load[3] = context->counter_load[2];
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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
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82 #define PSG_VOL_DIV 14
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83
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84 //table shamelessly swiped from PSG doc from smspower.org
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85 static int16_t volume_table[16] = {
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86 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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87 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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88 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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89 };
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90
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91 void psg_run(psg_context * context, uint32_t cycles)
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92 {
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93 while (context->cycles < cycles) {
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94 for (int i = 0; i < 4; i++) {
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95 if (context->counters[i]) {
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96 context->counters[i] -= 1;
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97 }
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98 if (!context->counters[i]) {
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99 context->counters[i] = context->counter_load[i];
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100 context->output_state[i] = !context->output_state[i];
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101 if (i == 3 && context->output_state[i]) {
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102 context->noise_out = context->lsfr & 1;
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103 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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104 if (context->noise_type) {
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105 //white noise
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106 if (context->lsfr & 0x40) {
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107 context->lsfr ^= 0x8000;
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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
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114 int16_t left_accum = 0, right_accum = 0;
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115 uint8_t pan_left = 0x10, pan_right = 0x1;
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116
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117 for (int i = 0; i < 3; i++) {
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118 if (context->output_state[i]) {
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119 int16_t value = volume_table[context->volume[i]];
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120 if (context->pan & pan_left) {
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121 left_accum += value;
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122 }
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123 if (context->pan & pan_right) {
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124 right_accum += value;
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125 }
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126 pan_left <<= 1;
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127 pan_right <<= 1;
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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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128 }
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129 }
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130 if (context->noise_out) {
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131 int16_t value = volume_table[context->volume[3]];
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132 if (context->pan & pan_left) {
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133 left_accum += value;
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134 }
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135 if (context->pan & pan_right) {
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136 right_accum += value;
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137 }
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138 }
2081
cfd53c94fffb Initial stab at RF5C164 emulation
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139
2196
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140 render_put_stereo_sample(context->audio, left_accum, right_accum);
838
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141
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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142 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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143 }
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parents:
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144 }
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parents:
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145
1909
508522f08e4d Initial stab at VGM logging support
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146 void psg_vgm_log(psg_context *context, uint32_t master_clock, vgm_writer *vgm)
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147 {
1911
f2ed8df7a002 Fix PSG frequency written to VGM header when logging
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148 vgm_sn76489_init(vgm, 16 * master_clock / context->clock_inc, 9, 16, 0);
1909
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149 context->vgm = vgm;
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150 for (int chan = 0; chan < 4; chan++)
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151 {
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152 uint8_t base = chan << 5 | 0x80;
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153 vgm_sn76489_write(context->vgm, context->cycles, context->volume[chan] | base | 0x10);
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154 if (chan == 3) {
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155 if (context->noise_use_tone) {
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156 vgm_sn76489_write(context->vgm, context->cycles, 3 | base);
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157 } else {
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158 //0x10 = 0
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159 //0x20 = 1
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160 //0x40 = 2
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161 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 5 | base);
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162 }
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diff changeset
163 } else {
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diff changeset
164 vgm_sn76489_write(context->vgm, context->cycles, (context->counter_load[chan] & 0xF) | base);
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diff changeset
165 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 4 & 0x3F);
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diff changeset
166 }
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
167 }
508522f08e4d Initial stab at VGM logging support
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diff changeset
168 }
508522f08e4d Initial stab at VGM logging support
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diff changeset
169
1427
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
170 void psg_serialize(psg_context *context, serialize_buffer *buf)
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diff changeset
171 {
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diff changeset
172 save_int16(buf, context->lsfr);
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diff changeset
173 save_buffer16(buf, context->counter_load, 4);
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diff changeset
174 save_buffer16(buf, context->counters, 4);
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diff changeset
175 save_buffer8(buf, context->volume, 4);
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diff changeset
176 uint8_t output_state = context->output_state[0] << 3 | context->output_state[1] << 2
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diff changeset
177 | context->output_state[2] << 1 | context->output_state[3]
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178 | context->noise_use_tone << 4;
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diff changeset
179 save_int8(buf, output_state);
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diff changeset
180 save_int8(buf, context->noise_type);
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diff changeset
181 save_int8(buf, context->latch);
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diff changeset
182 save_int32(buf, context->cycles);
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diff changeset
183 }
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diff changeset
184
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diff changeset
185 void psg_deserialize(deserialize_buffer *buf, void *vcontext)
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diff changeset
186 {
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diff changeset
187 psg_context *context = vcontext;
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188 context->lsfr = load_int16(buf);
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diff changeset
189 load_buffer16(buf, context->counter_load, 4);
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diff changeset
190 load_buffer16(buf, context->counters, 4);
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diff changeset
191 load_buffer8(buf, context->volume, 4);
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diff changeset
192 uint8_t output_state = load_int8(buf);
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
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parents: 1427
diff changeset
193 context->output_state[0] = output_state >> 3 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
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parents: 1427
diff changeset
194 context->output_state[1] = output_state >> 2 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
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parents: 1427
diff changeset
195 context->output_state[2] = output_state >> 1 & 1;
1427
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diff changeset
196 context->output_state[3] = output_state & 1;
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
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parents: 1427
diff changeset
197 context->noise_use_tone = output_state >> 4 & 1;
1427
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diff changeset
198 context->noise_type = load_int8(buf);
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diff changeset
199 context->latch = load_int8(buf);
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diff changeset
200 context->cycles = load_int32(buf);
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diff changeset
201 }