annotate psg.c @ 1702:73ac2e59fa3f

Implemented sbc instruction in CPU DSL
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Jan 2019 14:37:37 -0800
parents 6ce36c3f250b
children 4c322abd9fa5
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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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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 #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(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 (value & 0x80) {
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37 context->latch = value & 0x70;
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38 uint8_t channel = value >> 5 & 0x3;
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39 if (value & 0x10) {
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40 context->volume[channel] = value & 0xF;
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41 } else {
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42 if (channel == 3) {
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43 switch(value & 0x3)
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44 {
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45 case 0:
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46 case 1:
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47 case 2:
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48 context->counter_load[3] = 0x10 << (value & 0x3);
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49 context->noise_use_tone = 0;
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50 break;
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51 default:
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52 context->counter_load[3] = context->counter_load[2];
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53 context->noise_use_tone = 1;
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54 }
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55 context->noise_type = value & 0x4;
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56 context->lsfr = 0x8000;
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57 } else {
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58 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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59 if (channel == 2 && context->noise_use_tone) {
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60 context->counter_load[3] = context->counter_load[2];
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61 }
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62 }
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63 }
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64 } else {
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65 if (!(context->latch & 0x10)) {
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66 uint8_t channel = context->latch >> 5 & 0x3;
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67 if (channel != 3) {
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68 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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69 if (channel == 2 && context->noise_use_tone) {
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70 context->counter_load[3] = context->counter_load[2];
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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
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77 #define PSG_VOL_DIV 14
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78
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79 //table shamelessly swiped from PSG doc from smspower.org
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80 static int16_t volume_table[16] = {
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81 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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82 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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83 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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84 };
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85
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86 void psg_run(psg_context * context, uint32_t cycles)
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87 {
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88 while (context->cycles < cycles) {
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89 for (int i = 0; i < 4; i++) {
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90 if (context->counters[i]) {
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91 context->counters[i] -= 1;
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92 }
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93 if (!context->counters[i]) {
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94 context->counters[i] = context->counter_load[i];
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95 context->output_state[i] = !context->output_state[i];
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96 if (i == 3 && context->output_state[i]) {
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97 context->noise_out = context->lsfr & 1;
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98 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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99 if (context->noise_type) {
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100 //white noise
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101 if (context->lsfr & 0x40) {
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102 context->lsfr ^= 0x8000;
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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
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109 int16_t accum = 0;
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110
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111 for (int i = 0; i < 3; i++) {
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112 if (context->output_state[i]) {
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113 accum += volume_table[context->volume[i]];
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114 }
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115 }
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116 if (context->noise_out) {
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117 accum += volume_table[context->volume[3]];
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118 }
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119
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120 render_put_mono_sample(context->audio, accum);
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121
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122 context->cycles += context->clock_inc;
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123 }
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124 }
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125
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126 void psg_serialize(psg_context *context, serialize_buffer *buf)
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127 {
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128 save_int16(buf, context->lsfr);
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129 save_buffer16(buf, context->counter_load, 4);
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130 save_buffer16(buf, context->counters, 4);
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131 save_buffer8(buf, context->volume, 4);
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132 uint8_t output_state = context->output_state[0] << 3 | context->output_state[1] << 2
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133 | context->output_state[2] << 1 | context->output_state[3]
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134 | context->noise_use_tone << 4;
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135 save_int8(buf, output_state);
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136 save_int8(buf, context->noise_type);
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137 save_int8(buf, context->latch);
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138 save_int32(buf, context->cycles);
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139 }
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140
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141 void psg_deserialize(deserialize_buffer *buf, void *vcontext)
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142 {
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143 psg_context *context = vcontext;
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144 context->lsfr = load_int16(buf);
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145 load_buffer16(buf, context->counter_load, 4);
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146 load_buffer16(buf, context->counters, 4);
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147 load_buffer8(buf, context->volume, 4);
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148 uint8_t output_state = load_int8(buf);
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149 context->output_state[0] = output_state >> 3 & 1;
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150 context->output_state[1] = output_state >> 2 & 1;
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151 context->output_state[2] = output_state >> 1 & 1;
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152 context->output_state[3] = output_state & 1;
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153 context->noise_use_tone = output_state >> 4 & 1;
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154 context->noise_type = load_int8(buf);
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155 context->latch = load_int8(buf);
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156 context->cycles = load_int32(buf);
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157 }