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annotate psg.c @ 884:252dfd29831d

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Selecting a second game from the menu now works
author Michael Pavone <pavone@retrodev.com>
date Fri, 13 Nov 2015 22:56:59 -0800
parents 715475788e93
children bd549b25c362
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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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 void psg_free(psg_context *context)
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28 {
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29 free(context->audio_buffer);
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30 //TODO: Figure out how to make this 100% safe
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31 //audio thread could still be using this
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32 free(context->back_buffer);
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33 free(context);
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34 }
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35
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36 #define BUFFER_INC_RES 1000000000UL
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37
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38 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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39 {
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40 uint64_t old_inc = context->buffer_inc;
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41 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)context->clock_inc;
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42 }
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43
354
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44 void psg_write(psg_context * context, uint8_t value)
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45 {
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46 if (value & 0x80) {
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47 context->latch = value & 0x70;
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48 uint8_t channel = value >> 5 & 0x3;
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49 if (value & 0x10) {
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50 context->volume[channel] = value & 0xF;
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51 } else {
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52 if (channel == 3) {
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53 switch(value & 0x3)
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54 {
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55 case 0:
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56 case 1:
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57 case 2:
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58 context->counter_load[3] = 0x10 << (value & 0x3);
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59 context->noise_use_tone = 0;
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60 break;
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61 default:
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62 context->counter_load[3] = context->counter_load[2];
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63 context->noise_use_tone = 1;
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64 }
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65 context->noise_type = value & 0x4;
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66 context->lsfr = 0x8000;
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67 } else {
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68 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 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 } else {
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75 if (!(context->latch & 0x10)) {
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76 uint8_t channel = context->latch >> 5 & 0x3;
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77 if (channel != 3) {
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78 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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79 if (channel == 2 && context->noise_use_tone) {
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80 context->counter_load[3] = context->counter_load[2];
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81 }
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82 }
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83 }
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84 }
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85 }
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86
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87 #define PSG_VOL_DIV 14
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88
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89 //table shamelessly swiped from PSG doc from smspower.org
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90 int16_t volume_table[16] = {
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91 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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92 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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93 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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94 };
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95
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96 void psg_run(psg_context * context, uint32_t cycles)
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97 {
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98 while (context->cycles < cycles) {
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99 for (int i = 0; i < 4; i++) {
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100 if (context->counters[i]) {
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101 context->counters[i] -= 1;
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102 }
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103 if (!context->counters[i]) {
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104 context->counters[i] = context->counter_load[i];
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105 context->output_state[i] = !context->output_state[i];
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106 if (i == 3 && context->output_state[i]) {
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107 context->noise_out = context->lsfr & 1;
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108 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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109 if (context->noise_type) {
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110 //white noise
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111 if (context->lsfr & 0x40) {
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112 context->lsfr ^= 0x8000;
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113 }
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114 }
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115 }
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116 }
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117 }
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118
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119 for (int i = 0; i < 3; i++) {
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120 if (context->output_state[i]) {
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121 context->accum += volume_table[context->volume[i]];
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122 }
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123 }
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124 if (context->noise_out) {
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125 context->accum += volume_table[context->volume[3]];
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126 }
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127 context->sample_count++;
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128
354
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129 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
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130 if (context->buffer_fraction >= BUFFER_INC_RES) {
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131 context->buffer_fraction -= BUFFER_INC_RES;
838
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132
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133 context->audio_buffer[context->buffer_pos++] = context->accum / context->sample_count;
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134 context->accum = context->sample_count = 0;
354
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135 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.
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parents: 483
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136 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.
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parents: 483
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137 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
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138 }
354
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139 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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140 }
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
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141 context->cycles += context->clock_inc;
354
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142 }
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143 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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144