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annotate psg.c @ 763:2a25ea5d94f7

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Fix sense of HAS_PROC check
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Jun 2015 19:23:38 -0700
parents 6a14c5a95648
children 9a5dc22297f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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
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12 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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13 {
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14 memset(context, 0, sizeof(*context));
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15 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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16 context->back_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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17 context->clock_inc = clock_div;
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18 context->sample_rate = sample_rate;
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19 context->samples_frame = samples_frame;
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20 psg_adjust_master_clock(context, master_clock);
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21 for (int i = 0; i < 4; i++) {
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22 context->volume[i] = 0xF;
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23 }
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24 }
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25
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26 #define BUFFER_INC_RES 1000000000UL
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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 uint64_t old_inc = context->buffer_inc;
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31 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)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 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 context->buffer_fraction += context->buffer_inc;
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109 if (context->buffer_fraction >= BUFFER_INC_RES) {
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110 context->buffer_fraction -= BUFFER_INC_RES;
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111 int16_t acc = 0;
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112 for (int i = 0; i < 3; i++) {
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113 if (context->output_state[i]) {
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114 acc += volume_table[context->volume[i]];
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115 }
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116 }
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117 if (context->noise_out) {
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118 acc += volume_table[context->volume[3]];
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119 }
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120 context->audio_buffer[context->buffer_pos++] = acc;
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121 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
122 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
123 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
124 }
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
125 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
126 }
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
127 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
128 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
129 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
130