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annotate gen_player.c @ 1975:3701517d852c

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Avoid expensive re-init from switching to external sync after render_init has been called
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 16:52:32 -0700
parents bd70f1e15684
children a042e046f7f2
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rev   line source
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)
1947
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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 }
1947
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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 }
1947
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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