annotate psg.c @ 465:dc322bc77ea2

Fix stateview. Update "all" target in Makefile.
author Mike Pavone <pavone@retrodev.com>
date Tue, 10 Sep 2013 21:07:13 -0700
parents 41c079dbee73
children 140af5509ce7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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1 #include "psg.h"
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2 #include "render.h"
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3 #include <string.h>
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4 #include <stdlib.h>
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5
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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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6 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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7 {
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8 memset(context, 0, sizeof(*context));
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9 context->audio_buffer = malloc(sizeof(*context->audio_buffer) * samples_frame);
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10 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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11 double clock_rate = (double)master_clock / (double)clock_div;
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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12 context->buffer_inc = ((double)sample_rate / (double)master_clock) * clock_div;
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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13 context->clock_inc = clock_div;
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14 context->samples_frame = samples_frame;
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15 for (int i = 0; i < 4; i++) {
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16 context->volume[i] = 0xF;
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17 }
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18 }
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19
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20 void psg_write(psg_context * context, uint8_t value)
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21 {
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22 if (value & 0x80) {
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23 context->latch = value & 0x70;
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24 uint8_t channel = value >> 5 & 0x3;
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25 if (value & 0x10) {
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26 context->volume[channel] = value & 0xF;
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27 } else {
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28 if (channel == 3) {
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29 switch(value & 0x3)
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30 {
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31 case 0:
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32 case 1:
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33 case 2:
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34 context->counter_load[3] = 0x10 << (value & 0x3);
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35 context->noise_use_tone = 0;
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36 break;
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37 default:
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38 context->counter_load[3] = context->counter_load[2];
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39 context->noise_use_tone = 1;
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40 }
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41 context->noise_type = value & 0x4;
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42 context->lsfr = 0x8000;
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43 } else {
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44 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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45 if (channel == 2 && context->noise_use_tone) {
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46 context->counter_load[3] = context->counter_load[2];
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47 }
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48 }
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49 }
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50 } else {
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51 if (!(context->latch & 0x10)) {
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52 uint8_t channel = context->latch >> 5 & 0x3;
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53 if (channel != 3) {
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54 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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55 if (channel == 2 && context->noise_use_tone) {
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56 context->counter_load[3] = context->counter_load[2];
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57 }
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58 }
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59 }
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60 }
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61 }
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62
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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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63 #define PSG_VOL_DIV 6
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64
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65 //table shamelessly swiped from PSG doc from smspower.org
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66 int16_t volume_table[16] = {
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67 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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68 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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69 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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70 };
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71
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72 void psg_run(psg_context * context, uint32_t cycles)
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73 {
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74 while (context->cycles < cycles) {
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75 for (int i = 0; i < 4; i++) {
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76 if (context->counters[i]) {
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77 context->counters[i] -= 1;
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78 }
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79 if (!context->counters[i]) {
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80 context->counters[i] = context->counter_load[i];
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81 context->output_state[i] = !context->output_state[i];
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82 if (i == 3 && context->output_state[i]) {
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83 context->noise_out = context->lsfr & 1;
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84 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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85 if (context->noise_type) {
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86 //white noise
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87 if (context->lsfr & 0x40) {
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88 context->lsfr ^= 0x8000;
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89 }
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90 }
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91 }
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92 }
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93 }
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94 context->buffer_fraction += context->buffer_inc;
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95 if (context->buffer_fraction >= 1.0) {
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96 context->buffer_fraction -= 1.0;
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97 int16_t acc = 0;
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98 for (int i = 0; i < 3; i++) {
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99 if (context->output_state[i]) {
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100 acc += volume_table[context->volume[i]];
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101 }
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102 }
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103 if (context->noise_out) {
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104 acc += volume_table[context->volume[3]];
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105 }
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106 context->audio_buffer[context->buffer_pos++] = acc;
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107 if (context->buffer_pos == context->samples_frame) {
364
62177cc39049 Incredibly broken YM2612 support plus a fix to Z80 bus request
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108 render_wait_psg(context);
354
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109 }
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110 }
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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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parents: 364
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111 context->cycles += context->clock_inc;
354
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112 }
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113 }
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114