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annotate psg.c @ 1105:27ea21b10361

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Fix Z80 RAM mapping after refactor
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Dec 2016 22:00:41 -0800
parents c15896605bf2
children 4d16c09210fd
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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 #include <math.h>
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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, uint32_t lowpass_cutoff)
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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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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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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 double rc = (1.0 / (double)lowpass_cutoff) / (2.0 * M_PI);
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22 double dt = 1.0 / ((double)master_clock / (double)clock_div);
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23 double alpha = dt / (dt + rc);
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24 context->lowpass_alpha = (int32_t)(((double)0x10000) * alpha);
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25 psg_adjust_master_clock(context, master_clock);
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26 for (int i = 0; i < 4; i++) {
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27 context->volume[i] = 0xF;
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28 }
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29 }
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30
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31 void psg_free(psg_context *context)
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32 {
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33 free(context->audio_buffer);
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34 //TODO: Figure out how to make this 100% safe
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35 //audio thread could still be using this
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36 free(context->back_buffer);
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37 free(context);
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38 }
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39
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40 #define BUFFER_INC_RES 0x40000000UL
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41
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42 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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43 {
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44 uint64_t old_inc = context->buffer_inc;
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45 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)context->clock_inc;
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46 }
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47
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48 void psg_write(psg_context * context, uint8_t value)
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49 {
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50 if (value & 0x80) {
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51 context->latch = value & 0x70;
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52 uint8_t channel = value >> 5 & 0x3;
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53 if (value & 0x10) {
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54 context->volume[channel] = value & 0xF;
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55 } else {
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56 if (channel == 3) {
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57 switch(value & 0x3)
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58 {
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59 case 0:
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60 case 1:
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61 case 2:
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62 context->counter_load[3] = 0x10 << (value & 0x3);
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63 context->noise_use_tone = 0;
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64 break;
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65 default:
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66 context->counter_load[3] = context->counter_load[2];
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67 context->noise_use_tone = 1;
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68 }
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69 context->noise_type = value & 0x4;
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70 context->lsfr = 0x8000;
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71 } else {
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72 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 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 } else {
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79 if (!(context->latch & 0x10)) {
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80 uint8_t channel = context->latch >> 5 & 0x3;
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81 if (channel != 3) {
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82 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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83 if (channel == 2 && context->noise_use_tone) {
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84 context->counter_load[3] = context->counter_load[2];
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85 }
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86 }
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87 }
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88 }
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89 }
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90
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91 #define PSG_VOL_DIV 14
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92
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93 //table shamelessly swiped from PSG doc from smspower.org
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94 static int16_t volume_table[16] = {
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95 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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96 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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97 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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98 };
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99
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100 void psg_run(psg_context * context, uint32_t cycles)
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101 {
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102 while (context->cycles < cycles) {
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103 for (int i = 0; i < 4; i++) {
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104 if (context->counters[i]) {
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105 context->counters[i] -= 1;
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106 }
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107 if (!context->counters[i]) {
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108 context->counters[i] = context->counter_load[i];
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109 context->output_state[i] = !context->output_state[i];
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110 if (i == 3 && context->output_state[i]) {
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111 context->noise_out = context->lsfr & 1;
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112 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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113 if (context->noise_type) {
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114 //white noise
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115 if (context->lsfr & 0x40) {
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116 context->lsfr ^= 0x8000;
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117 }
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118 }
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119 }
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120 }
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121 }
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122
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123 context->last_sample = context->accum;
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parents: 884
diff changeset
124 context->accum = 0;
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parents: 884
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125
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
diff changeset
126 for (int i = 0; i < 3; i++) {
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
diff changeset
127 if (context->output_state[i]) {
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
diff changeset
128 context->accum += volume_table[context->volume[i]];
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parents: 522
diff changeset
129 }
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
diff changeset
130 }
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
diff changeset
131 if (context->noise_out) {
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
diff changeset
132 context->accum += volume_table[context->volume[3]];
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
Michael Pavone <pavone@retrodev.com>
parents: 522
diff changeset
133 }
964
e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
Michael Pavone <pavone@retrodev.com>
parents: 963
diff changeset
134 int32_t tmp = context->accum * context->lowpass_alpha + context->last_sample * (0x10000 - context->lowpass_alpha);
e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
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parents: 963
diff changeset
135 context->accum = tmp >> 16;
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
diff changeset
136
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
137 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
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
138 if (context->buffer_fraction >= BUFFER_INC_RES) {
3e1573fa22cf Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
Mike Pavone <pavone@retrodev.com>
parents: 467
diff changeset
139 context->buffer_fraction -= BUFFER_INC_RES;
964
e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
Michael Pavone <pavone@retrodev.com>
parents: 963
diff changeset
140 int32_t tmp = context->last_sample * ((context->buffer_fraction << 16) / context->buffer_inc);
e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
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parents: 963
diff changeset
141 tmp += context->accum * (0x10000 - ((context->buffer_fraction << 16) / context->buffer_inc));
963
bd549b25c362 Not so successful attempt at improved PSG resampling
Michael Pavone <pavone@retrodev.com>
parents: 884
diff changeset
142 context->audio_buffer[context->buffer_pos++] = tmp >> 16;
964
e6dc30231b83 Fix PSG linear resampling and implement a low pass filter
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parents: 963
diff changeset
143
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
144 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.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
145 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.
Michael Pavone <pavone@retrodev.com>
parents: 483
diff changeset
146 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
diff changeset
147 }
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
148 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
149 }
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
diff changeset
150 context->cycles += context->clock_inc;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
151 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
152 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
153