Mercurial > repos > blastem
annotate psg.c @ 553:1af6c1052993
Added untested code for generating ARM machine code
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 23 Feb 2014 21:37:19 -0800 |
parents | 6a14c5a95648 |
children | 9a5dc22297f2 |
rev | line source |
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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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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 |
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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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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
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109 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
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110 context->buffer_fraction -= BUFFER_INC_RES; |
354
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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111 int16_t acc = 0; |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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112 for (int i = 0; i < 3; i++) { |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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113 if (context->output_state[i]) { |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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114 acc += volume_table[context->volume[i]]; |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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115 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
116 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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117 if (context->noise_out) { |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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118 acc += volume_table[context->volume[3]]; |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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119 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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120 context->audio_buffer[context->buffer_pos++] = acc; |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
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
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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
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125 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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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
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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
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128 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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129 } |
15dd6418fe67
Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
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130 |