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annotate psg.c @ 483:3e1573fa22cf

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Implement turbo/slow motion feature that overclocks or underclocks the entire system at the push of a button
author Mike Pavone <pavone@retrodev.com>
date Tue, 01 Oct 2013 23:51:16 -0700
parents 140af5509ce7
children b7b7a1cab44a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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7 #include "render.h"
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8 #include <string.h>
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9 #include <stdlib.h>
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10
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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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11 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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12 {
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13 memset(context, 0, sizeof(*context));
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14 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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15 context->back_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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16 context->clock_inc = clock_div;
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17 context->sample_rate = sample_rate;
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18 context->samples_frame = samples_frame;
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19 psg_adjust_master_clock(context, master_clock);
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20 for (int i = 0; i < 4; i++) {
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21 context->volume[i] = 0xF;
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22 }
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23 }
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24
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25 #define BUFFER_INC_RES 1000000000UL
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26
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27 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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28 {
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29 uint64_t old_inc = context->buffer_inc;
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30 context->buffer_inc = ((BUFFER_INC_RES * (uint64_t)context->sample_rate) / (uint64_t)master_clock) * (uint64_t)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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41c079dbee73 Use a slightly more sane PSG volume divider. Stil seems too loud, need to check the real hardware.
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76 #define PSG_VOL_DIV 6
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77
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78 //table shamelessly swiped from PSG doc from smspower.org
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79 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 context->buffer_fraction += context->buffer_inc;
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108 if (context->buffer_fraction >= BUFFER_INC_RES) {
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109 context->buffer_fraction -= BUFFER_INC_RES;
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110 int16_t acc = 0;
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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 acc += 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 acc += volume_table[context->volume[3]];
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118 }
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119 context->audio_buffer[context->buffer_pos++] = acc;
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120 if (context->buffer_pos == context->samples_frame) {
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62177cc39049 Incredibly broken YM2612 support plus a fix to Z80 bus request
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121 render_wait_psg(context);
354
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122 }
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Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
123 }
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
124 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
125 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
126 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
127