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annotate libblastem.c @ 1719:fb5ae8c20b85

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Fix cp instruction in new Z80 core and implement its DD/FD prefixes
author Michael Pavone <pavone@retrodev.com>
date Wed, 30 Jan 2019 21:47:35 -0800
parents 3c34122754ac
children 03895a4585c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1688
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1 #include <stdlib.h>
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2 #include <string.h>
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3 #include "libretro.h"
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4 #include "system.h"
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5 #include "util.h"
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6 #include "vdp.h"
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7 #include "render.h"
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8 #include "io.h"
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9
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10 static retro_environment_t retro_environment;
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11 RETRO_API void retro_set_environment(retro_environment_t re)
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12 {
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13 retro_environment = re;
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14 }
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15
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16 static retro_video_refresh_t retro_video_refresh;
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17 RETRO_API void retro_set_video_refresh(retro_video_refresh_t rvf)
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18 {
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19 retro_video_refresh = rvf;
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20 }
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21
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22 static retro_audio_sample_t retro_audio_sample;
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23 RETRO_API void retro_set_audio_sample(retro_audio_sample_t ras)
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24 {
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25 retro_audio_sample = ras;
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26 }
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27
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28 RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t rasb)
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29 {
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30 }
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31
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32 static retro_input_poll_t retro_input_poll;
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33 RETRO_API void retro_set_input_poll(retro_input_poll_t rip)
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34 {
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35 retro_input_poll = rip;
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36 }
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37
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38 static retro_input_state_t retro_input_state;
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39 RETRO_API void retro_set_input_state(retro_input_state_t ris)
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40 {
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41 retro_input_state = ris;
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42 }
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43
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44 int headless = 0;
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45 int exit_after = 0;
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46 int z80_enabled = 1;
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47 char *save_filename;
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48 tern_node *config;
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49 uint8_t use_native_states = 1;
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50 system_header *current_system;
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51 system_media media;
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52
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53 RETRO_API void retro_init(void)
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54 {
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55 }
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56
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57 RETRO_API void retro_deinit(void)
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58 {
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59 if (current_system) {
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60 retro_unload_game();
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61 }
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62 }
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63
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64 RETRO_API unsigned retro_api_version(void)
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65 {
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66 return RETRO_API_VERSION;
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67 }
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68
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69 RETRO_API void retro_get_system_info(struct retro_system_info *info)
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70 {
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71 info->library_name = "BlastEm";
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72 info->library_version = "0.6.2-pre"; //TODO: share this with blastem.c
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73 info->valid_extensions = "md|gen|sms|bin|rom";
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74 info->need_fullpath = 0;
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75 info->block_extract = 0;
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76 }
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77
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78 static vid_std video_standard;
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79 static uint32_t last_width, last_height;
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80 RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info)
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81 {
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82 last_width = LINEBUF_SIZE;
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83 info->geometry.base_width = info->geometry.max_width = LINEBUF_SIZE;
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84 info->geometry.base_height = video_standard == VID_NTSC ? 243 : 294;
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85 last_height = info->geometry.base_height;
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86 info->geometry.max_height = info->geometry.base_height * 2;
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87 info->geometry.aspect_ratio = 0;
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88 info->timing.fps = video_standard == VID_NTSC ? 60 : 50;
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89 info->timing.sample_rate = 53267; //approximate sample rate of YM2612
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90 }
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91
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92 RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device)
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93 {
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94 }
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95
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96 /* Resets the current game. */
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97 RETRO_API void retro_reset(void)
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98 {
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99 current_system->soft_reset(current_system);
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100 }
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101
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102 /* Runs the game for one video frame.
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103 * During retro_run(), input_poll callback must be called at least once.
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104 *
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105 * If a frame is not rendered for reasons where a game "dropped" a frame,
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106 * this still counts as a frame, and retro_run() should explicitly dupe
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107 * a frame if GET_CAN_DUPE returns true.
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108 * In this case, the video callback can take a NULL argument for data.
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109 */
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110 static uint8_t started;
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111 RETRO_API void retro_run(void)
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112 {
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113 if (started) {
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114 current_system->resume_context(current_system);
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115 } else {
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116 current_system->start_context(current_system, NULL);
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117 started = 1;
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118 }
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119 }
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120
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121 /* Returns the amount of data the implementation requires to serialize
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122 * internal state (save states).
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123 * Between calls to retro_load_game() and retro_unload_game(), the
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124 * returned size is never allowed to be larger than a previous returned
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125 * value, to ensure that the frontend can allocate a save state buffer once.
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126 */
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127 static size_t serialize_size_cache;
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128 RETRO_API size_t retro_serialize_size(void)
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129 {
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130 if (!serialize_size_cache) {
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131 uint8_t *tmp = current_system->serialize(current_system, &serialize_size_cache);
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132 free(tmp);
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133 }
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134 return serialize_size_cache;
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135 }
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136
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137 /* Serializes internal state. If failed, or size is lower than
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138 * retro_serialize_size(), it should return false, true otherwise. */
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139 RETRO_API bool retro_serialize(void *data, size_t size)
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140 {
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141 size_t actual_size;
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142 uint8_t *tmp = current_system->serialize(current_system, &actual_size);
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143 if (actual_size > size) {
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144 free(tmp);
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145 return 0;
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146 }
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147 memcpy(data, tmp, actual_size);
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148 free(tmp);
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149 return 1;
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150 }
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151
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152 RETRO_API bool retro_unserialize(const void *data, size_t size)
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153 {
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154 current_system->deserialize(current_system, (uint8_t *)data, size);
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155 return 0;
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156 }
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157
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158 RETRO_API void retro_cheat_reset(void)
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159 {
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160 }
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161
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162 RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code)
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163 {
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164 }
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165
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166 /* Loads a game. */
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167 RETRO_API bool retro_load_game(const struct retro_game_info *game)
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168 {
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169 serialize_size_cache = 0;
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170 if (game->path) {
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171 media.dir = path_dirname(game->path);
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172 media.name = basename_no_extension(game->path);
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173 media.extension = path_extension(game->path);
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174 }
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175 media.buffer = malloc(nearest_pow2(game->size));
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176 memcpy(media.buffer, game->data, game->size);
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177 media.size = game->size;
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178 current_system = alloc_config_system(detect_system_type(&media), &media, 0, 0);
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179
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180 unsigned format = RETRO_PIXEL_FORMAT_XRGB8888;
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181 retro_environment(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &format);
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182 return current_system != NULL;
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183 }
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184
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185 /* Loads a "special" kind of game. Should not be used,
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186 * except in extreme cases. */
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187 RETRO_API bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
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188 {
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189 return retro_load_game(info);
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190 }
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191
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192 /* Unloads a currently loaded game. */
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193 RETRO_API void retro_unload_game(void)
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194 {
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195 free(media.dir);
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196 free(media.name);
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197 free(media.extension);
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198 media.dir = media.name = media.extension = NULL;
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199 //buffer is freed by the context
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200 media.buffer = NULL;
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201 current_system->free_context(current_system);
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202 current_system = NULL;
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203 }
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204
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205 /* Gets region of game. */
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206 RETRO_API unsigned retro_get_region(void)
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207 {
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208 return video_standard == VID_NTSC ? RETRO_REGION_NTSC : RETRO_REGION_PAL;
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209 }
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210
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211 /* Gets region of memory. */
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212 RETRO_API void *retro_get_memory_data(unsigned id)
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213 {
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214 return NULL;
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215 }
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216
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217 RETRO_API size_t retro_get_memory_size(unsigned id)
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218 {
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219 return 0;
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220 }
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221
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222 //blastem render backend API implementation
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223 uint32_t render_map_color(uint8_t r, uint8_t g, uint8_t b)
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224 {
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225 return r << 16 | g << 8 | b;
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226 }
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227
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228 uint8_t render_create_window(char *caption, uint32_t width, uint32_t height, window_close_handler close_handler)
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229 {
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230 //not supported in lib build
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231 return 0;
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232 }
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233
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234 void render_destroy_window(uint8_t which)
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diff changeset
235 {
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236 //not supported in lib build
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diff changeset
237 }
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238
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239 static uint32_t fb[LINEBUF_SIZE * 294 * 2];
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3c34122754ac Properly support interlace in libretro build
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240 static uint8_t last_fb;
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diff changeset
241 uint32_t *render_get_framebuffer(uint8_t which, int *pitch)
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diff changeset
242 {
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diff changeset
243 *pitch = LINEBUF_SIZE * sizeof(uint32_t);
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diff changeset
244 if (which != last_fb) {
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diff changeset
245 *pitch = *pitch * 2;
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diff changeset
246 }
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diff changeset
247
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diff changeset
248 if (which) {
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249 return fb + LINEBUF_SIZE;
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250 } else {
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251 return fb;
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252 }
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253 }
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254
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255 void render_framebuffer_updated(uint8_t which, int width)
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diff changeset
256 {
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9e4dd1595f37 Fix aspect ratio for H32 games
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diff changeset
257 unsigned height = video_standard == VID_NTSC ? 243 : 294;
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diff changeset
258 unsigned base_height = height;
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259 if (which != last_fb) {
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260 height *= 2;
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261 last_fb = which;
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diff changeset
262 }
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diff changeset
263 if (width != last_width || height != last_height) {
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9e4dd1595f37 Fix aspect ratio for H32 games
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diff changeset
264 struct retro_game_geometry geometry = {
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265 .base_width = width,
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diff changeset
266 .base_height = height,
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diff changeset
267 .aspect_ratio = (float)LINEBUF_SIZE / base_height
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diff changeset
268 };
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diff changeset
269 retro_environment(RETRO_ENVIRONMENT_SET_GEOMETRY, &geometry);
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diff changeset
270 last_width = width;
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diff changeset
271 last_height = height;
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diff changeset
272 }
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273 retro_video_refresh(fb, width, height, LINEBUF_SIZE * sizeof(uint32_t));
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diff changeset
274 current_system->request_exit(current_system);
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diff changeset
275 }
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diff changeset
276
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diff changeset
277 uint8_t render_get_active_framebuffer(void)
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diff changeset
278 {
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diff changeset
279 return 0;
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parents:
diff changeset
280 }
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diff changeset
281
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diff changeset
282 void render_set_video_standard(vid_std std)
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diff changeset
283 {
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diff changeset
284 video_standard = std;
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diff changeset
285 }
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diff changeset
286
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diff changeset
287 void process_events()
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parents:
diff changeset
288 {
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diff changeset
289 static int16_t prev_state[2][RETRO_DEVICE_ID_JOYPAD_L2];
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parents:
diff changeset
290 static const uint8_t map[] = {
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diff changeset
291 BUTTON_A, BUTTON_X, BUTTON_MODE, BUTTON_START, DPAD_UP, DPAD_DOWN,
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parents:
diff changeset
292 DPAD_LEFT, DPAD_RIGHT, BUTTON_B, BUTTON_Y, BUTTON_Z, BUTTON_C
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parents:
diff changeset
293 };
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294 //TODO: handle other input device types
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295 //TODO: handle more than 2 ports when appropriate
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296 retro_input_poll();
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297 for (int port = 0; port < 2; port++)
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298 {
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299 for (int id = RETRO_DEVICE_ID_JOYPAD_B; id < RETRO_DEVICE_ID_JOYPAD_L2; id++)
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300 {
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301 int16_t new_state = retro_input_state(port, RETRO_DEVICE_JOYPAD, 0, id);
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302 if (new_state != prev_state[port][id]) {
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303 if (new_state) {
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304 current_system->gamepad_down(current_system, port + 1, map[id]);
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305 } else {
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306 current_system->gamepad_up(current_system, port + 1, map[id]);
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307 }
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308 prev_state[port][id] = new_state;
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309 }
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310 }
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311 }
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312 }
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313
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314 void render_errorbox(char *title, char *message)
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315 {
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316 }
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317 void render_warnbox(char *title, char *message)
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318 {
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319 }
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320 void render_infobox(char *title, char *message)
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321 {
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322 }
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323
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324 struct audio_source {
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325 int32_t freq;
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326 int32_t left_accum;
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327 int32_t right_accum;
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328 int32_t num_samples;
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329 };
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330
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331 static audio_source *audio_sources[8];
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332 static uint8_t num_audio_sources;
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333 audio_source *render_audio_source(uint64_t master_clock, uint64_t sample_divider, uint8_t channels)
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334 {
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335 audio_sources[num_audio_sources] = calloc(1, sizeof(audio_source));
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336 audio_sources[num_audio_sources]->freq = master_clock / sample_divider;
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337 return audio_sources[num_audio_sources++];
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338 }
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339
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340 void render_audio_adjust_clock(audio_source *src, uint64_t master_clock, uint64_t sample_divider)
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341 {
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342 }
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343
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344 static void check_put_sample(void)
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345 {
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346 for (int i = 0; i < num_audio_sources; i++)
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347 {
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348 int32_t min_samples = audio_sources[i]->freq / 53267;
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diff changeset
349 if (audio_sources[i]->num_samples < min_samples) {
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350 return;
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351 }
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352 }
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353 int16_t left = 0, right = 0;
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354 for (int i = 0; i < num_audio_sources; i++)
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355 {
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356 left += audio_sources[i]->left_accum / audio_sources[i]->num_samples;
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357 right += audio_sources[i]->right_accum / audio_sources[i]->num_samples;
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358 audio_sources[i]->left_accum = audio_sources[i]->right_accum = audio_sources[i]->num_samples = 0;
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359 }
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360 retro_audio_sample(left, right);
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361 }
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362
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363 void render_put_mono_sample(audio_source *src, int16_t value)
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364 {
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365 src->left_accum += value;
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366 src->right_accum += value;
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367 src->num_samples++;
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368 check_put_sample();
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369 }
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370 void render_put_stereo_sample(audio_source *src, int16_t left, int16_t right)
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parents:
diff changeset
371 {
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372 src->left_accum += left;
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373 src->right_accum += right;
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374 src->num_samples++;
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375 check_put_sample();
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376 }
1688
395f684c5379 Fixed the most glaring issues in libretro build
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parents: 1687
diff changeset
377
1687
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378 void render_free_source(audio_source *src)
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diff changeset
379 {
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diff changeset
380 int index;
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parents:
diff changeset
381 for (index = 0; index < num_audio_sources; index++)
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parents:
diff changeset
382 {
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parents:
diff changeset
383 if (audio_sources[index] == src) {
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parents:
diff changeset
384 break;
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parents:
diff changeset
385 }
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parents:
diff changeset
386 }
6c54bb5fe3b3 Hacky WIP libertro implementation
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parents:
diff changeset
387 num_audio_sources--;
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parents:
diff changeset
388 audio_sources[index] = audio_sources[num_audio_sources];
6c54bb5fe3b3 Hacky WIP libertro implementation
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parents:
diff changeset
389 free(src);
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parents:
diff changeset
390 }
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parents:
diff changeset
391
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parents:
diff changeset
392 void bindings_set_mouse_mode(uint8_t mode)
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parents:
diff changeset
393 {
6c54bb5fe3b3 Hacky WIP libertro implementation
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parents:
diff changeset
394 }