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annotate psg.c @ 1865:4c322abd9fa5

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Split generic part of audio code into a separate file so it can be used in other targets besides SDL
author Michael Pavone <pavone@retrodev.com>
date Fri, 17 May 2019 08:43:30 -0700
parents 6ce36c3f250b
children 508522f08e4d
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467
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 <string.h>
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9 #include <stdlib.h>
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10 #include <stdio.h>
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11 #include <math.h>
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12 void psg_init(psg_context * context, uint32_t master_clock, uint32_t clock_div)
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13 {
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14 memset(context, 0, sizeof(*context));
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15 context->audio = render_audio_source(master_clock, clock_div, 1);
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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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16 context->clock_inc = clock_div;
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17 for (int i = 0; i < 4; i++) {
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18 context->volume[i] = 0xF;
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19 }
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20 }
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21
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22 void psg_free(psg_context *context)
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23 {
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24 render_free_source(context->audio);
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25 free(context);
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26 }
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27
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28 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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29 {
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30 render_audio_adjust_clock(context->audio, master_clock, context->clock_inc);
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31 }
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32
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33 void psg_write(psg_context * context, uint8_t value)
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34 {
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35 if (value & 0x80) {
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36 context->latch = value & 0x70;
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37 uint8_t channel = value >> 5 & 0x3;
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38 if (value & 0x10) {
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39 context->volume[channel] = value & 0xF;
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40 } else {
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41 if (channel == 3) {
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42 switch(value & 0x3)
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43 {
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44 case 0:
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45 case 1:
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46 case 2:
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47 context->counter_load[3] = 0x10 << (value & 0x3);
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48 context->noise_use_tone = 0;
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49 break;
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50 default:
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51 context->counter_load[3] = context->counter_load[2];
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52 context->noise_use_tone = 1;
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53 }
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54 context->noise_type = value & 0x4;
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55 context->lsfr = 0x8000;
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56 } else {
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57 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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58 if (channel == 2 && context->noise_use_tone) {
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59 context->counter_load[3] = context->counter_load[2];
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60 }
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61 }
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62 }
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63 } else {
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64 if (!(context->latch & 0x10)) {
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65 uint8_t channel = context->latch >> 5 & 0x3;
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66 if (channel != 3) {
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67 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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68 if (channel == 2 && context->noise_use_tone) {
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69 context->counter_load[3] = context->counter_load[2];
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70 }
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71 }
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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 #define PSG_VOL_DIV 14
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77
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78 //table shamelessly swiped from PSG doc from smspower.org
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79 static int16_t volume_table[16] = {
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80 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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81 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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82 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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83 };
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84
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85 void psg_run(psg_context * context, uint32_t cycles)
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86 {
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87 while (context->cycles < cycles) {
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88 for (int i = 0; i < 4; i++) {
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89 if (context->counters[i]) {
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90 context->counters[i] -= 1;
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91 }
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92 if (!context->counters[i]) {
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93 context->counters[i] = context->counter_load[i];
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94 context->output_state[i] = !context->output_state[i];
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95 if (i == 3 && context->output_state[i]) {
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96 context->noise_out = context->lsfr & 1;
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97 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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98 if (context->noise_type) {
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99 //white noise
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100 if (context->lsfr & 0x40) {
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101 context->lsfr ^= 0x8000;
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102 }
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103 }
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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 int16_t accum = 0;
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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 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 accum += volume_table[context->volume[3]];
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117 }
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118
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119 render_put_mono_sample(context->audio, accum);
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120
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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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121 context->cycles += context->clock_inc;
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122 }
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123 }
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124
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125 void psg_serialize(psg_context *context, serialize_buffer *buf)
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126 {
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127 save_int16(buf, context->lsfr);
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128 save_buffer16(buf, context->counter_load, 4);
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129 save_buffer16(buf, context->counters, 4);
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130 save_buffer8(buf, context->volume, 4);
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131 uint8_t output_state = context->output_state[0] << 3 | context->output_state[1] << 2
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132 | context->output_state[2] << 1 | context->output_state[3]
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133 | context->noise_use_tone << 4;
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134 save_int8(buf, output_state);
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135 save_int8(buf, context->noise_type);
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136 save_int8(buf, context->latch);
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137 save_int32(buf, context->cycles);
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138 }
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139
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140 void psg_deserialize(deserialize_buffer *buf, void *vcontext)
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141 {
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142 psg_context *context = vcontext;
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143 context->lsfr = load_int16(buf);
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144 load_buffer16(buf, context->counter_load, 4);
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145 load_buffer16(buf, context->counters, 4);
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146 load_buffer8(buf, context->volume, 4);
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147 uint8_t output_state = load_int8(buf);
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148 context->output_state[0] = output_state >> 3 & 1;
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149 context->output_state[1] = output_state >> 2 & 1;
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150 context->output_state[2] = output_state >> 1 & 1;
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151 context->output_state[3] = output_state & 1;
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152 context->noise_use_tone = output_state >> 4 & 1;
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153 context->noise_type = load_int8(buf);
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154 context->latch = load_int8(buf);
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155 context->cycles = load_int32(buf);
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156 }