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annotate gen_player.c @ 1971:80920c21bb52

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Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 11:40:30 -0700
parents bd70f1e15684
children a042e046f7f2
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1947
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1 #include "gen_player.h"
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2 #include "event_log.h"
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3 #include "render.h"
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4
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5 #ifdef IS_LIB
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6 #define MAX_SOUND_CYCLES (MCLKS_PER_YM*NUM_OPERATORS*6*4)
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7 #else
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8 #define MAX_SOUND_CYCLES 100000
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9 #endif
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10
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11 static void sync_sound(gen_player *gen, uint32_t target)
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12 {
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13 //printf("YM | Cycle: %d, bpos: %d, PSG | Cycle: %d, bpos: %d\n", gen->ym->current_cycle, gen->ym->buffer_pos, gen->psg->cycles, gen->psg->buffer_pos * 2);
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14 while (target > gen->psg->cycles && target - gen->psg->cycles > MAX_SOUND_CYCLES) {
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15 uint32_t cur_target = gen->psg->cycles + MAX_SOUND_CYCLES;
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16 //printf("Running PSG to cycle %d\n", cur_target);
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17 psg_run(gen->psg, cur_target);
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18 //printf("Running YM-2612 to cycle %d\n", cur_target);
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19 ym_run(gen->ym, cur_target);
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20 }
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21 psg_run(gen->psg, target);
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22 ym_run(gen->ym, target);
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23
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24 //printf("Target: %d, YM bufferpos: %d, PSG bufferpos: %d\n", target, gen->ym->buffer_pos, gen->psg->buffer_pos * 2);
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25 }
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26
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27 static void run(gen_player *player)
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28 {
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29 while(player->reader.socket || player->reader.buffer.cur_pos < player->reader.buffer.size)
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30 {
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31 uint32_t cycle;
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32 uint8_t event = reader_next_event(&player->reader, &cycle);
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33 switch (event)
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34 {
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35 case EVENT_FLUSH:
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36 sync_sound(player, cycle);
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37 vdp_run_context(player->vdp, cycle);
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38 break;
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39 case EVENT_ADJUST: {
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40 sync_sound(player, cycle);
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41 vdp_run_context(player->vdp, cycle);
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42 uint32_t deduction = load_int32(&player->reader.buffer);
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43 ym_adjust_cycles(player->ym, deduction);
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44 vdp_adjust_cycles(player->vdp, deduction);
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45 player->psg->cycles -= deduction;
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46 break;
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47 case EVENT_PSG_REG:
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48 sync_sound(player, cycle);
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49 reader_ensure_data(&player->reader, 1);
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50 psg_write(player->psg, load_int8(&player->reader.buffer));
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51 break;
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52 case EVENT_YM_REG: {
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53 sync_sound(player, cycle);
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54 reader_ensure_data(&player->reader, 3);
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55 uint8_t part = load_int8(&player->reader.buffer);
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56 uint8_t reg = load_int8(&player->reader.buffer);
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57 uint8_t value = load_int8(&player->reader.buffer);
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58 if (part) {
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59 ym_address_write_part2(player->ym, reg);
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60 } else {
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61 ym_address_write_part1(player->ym, reg);
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62 }
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63 ym_data_write(player->ym, value);
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64 break;
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65 case EVENT_STATE: {
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66 reader_ensure_data(&player->reader, 3);
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67 uint32_t size = load_int8(&player->reader.buffer) << 16;
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68 size |= load_int16(&player->reader.buffer);
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69 reader_ensure_data(&player->reader, size);
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70 deserialize_buffer buffer;
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71 init_deserialize(&buffer, player->reader.buffer.data + player->reader.buffer.cur_pos, size);
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72 register_section_handler(&buffer, (section_handler){.fun = vdp_deserialize, .data = player->vdp}, SECTION_VDP);
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73 register_section_handler(&buffer, (section_handler){.fun = ym_deserialize, .data = player->ym}, SECTION_YM2612);
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74 register_section_handler(&buffer, (section_handler){.fun = psg_deserialize, .data = player->psg}, SECTION_PSG);
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75 while (buffer.cur_pos < buffer.size)
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76 {
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77 load_section(&buffer);
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78 }
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79 player->reader.buffer.cur_pos += size;
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80 free(buffer.handlers);
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81 break;
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82 }
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83 default:
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84 vdp_run_context(player->vdp, cycle);
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85 vdp_replay_event(player->vdp, event, &player->reader);
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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 if (!player->reader.socket) {
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91 reader_ensure_data(&player->reader, 1);
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92 }
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93 }
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94 }
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95
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96 static int thread_main(void *player)
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97 {
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98 run(player);
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99 return 0;
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100 }
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101
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102 void start_context(system_header *sys, char *statefile)
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103 {
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104 gen_player *player = (gen_player *)sys;
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105 if (player->reader.socket) {
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106 render_create_thread(&player->thread, "player", thread_main, player);
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107 } else {
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108 run(player);
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109 }
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110 }
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111
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112 static void gamepad_down(system_header *system, uint8_t gamepad_num, uint8_t button)
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113 {
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114 gen_player *player = (gen_player *)system;
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115 reader_send_gamepad_event(&player->reader, gamepad_num, button, 1);
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116 }
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117
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118 static void gamepad_up(system_header *system, uint8_t gamepad_num, uint8_t button)
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119 {
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120 gen_player *player = (gen_player *)system;
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121 reader_send_gamepad_event(&player->reader, gamepad_num, button, 0);
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122 }
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123
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124 #define MCLKS_NTSC 53693175
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125 #define MCLKS_PAL 53203395
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126 #define MCLKS_PER_YM 7
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127 #define MCLKS_PER_Z80 15
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128 #define MCLKS_PER_PSG (MCLKS_PER_Z80*16)
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129
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130 static void config_common(gen_player *player)
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131 {
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132 uint8_t vid_std = load_int8(&player->reader.buffer);
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133 uint8_t name_len = load_int8(&player->reader.buffer);
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134 player->header.info.name = calloc(1, name_len + 1);
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135 load_buffer8(&player->reader.buffer, player->header.info.name, name_len);
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136
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137 player->vdp = init_vdp_context(vid_std == VID_PAL, 0);
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138 render_set_video_standard(vid_std);
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139 uint32_t master_clock = vid_std == VID_NTSC ? MCLKS_NTSC : MCLKS_PAL;
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140
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141 player->ym = malloc(sizeof(ym2612_context));
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142 ym_init(player->ym, master_clock, MCLKS_PER_YM, 0);
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143
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144 player->psg = malloc(sizeof(psg_context));
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145 psg_init(player->psg, master_clock, MCLKS_PER_PSG);
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146
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147 player->header.start_context = start_context;
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148 player->header.gamepad_down = gamepad_down;
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149 player->header.gamepad_up = gamepad_up;
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150 player->header.type = SYSTEM_GENESIS_PLAYER;
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151 player->header.info.save_type = SAVE_NONE;
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152 }
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153
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154 gen_player *alloc_config_gen_player(void *stream, uint32_t rom_size)
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155 {
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156 uint8_t *data = stream;
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157 gen_player *player = calloc(1, sizeof(gen_player));
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158 init_event_reader(&player->reader, data + 9, rom_size - 9);
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159 config_common(player);
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160 return player;
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161 }
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162
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163 gen_player *alloc_config_gen_player_reader(event_reader *reader)
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164 {
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165 gen_player *player = calloc(1, sizeof(gen_player));
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166 player->reader = *reader;
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167 inflateCopy(&player->reader.input_stream, &reader->input_stream);
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168 render_set_external_sync(1);
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169 config_common(player);
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170 return player;
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171 }
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172