frontend/libretro.c

   1 /*
   2  * (C) notaz, 2012
   3  *
   4  * This work is licensed under the terms of the GNU GPLv2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11
  12 #include "../libpcsxcore/misc.h"
  13 #include "../libpcsxcore/psxcounters.h"
  14 #include "../libpcsxcore/new_dynarec/new_dynarec.h"
  15 #include "../plugins/dfsound/out.h"
  16 #include "../plugins/gpulib/cspace.h"
  17 #include "main.h"
  18 #include "plugin.h"
  19 #include "plugin_lib.h"
  20 #include "revision.h"
  21 #include "libretro.h"
  22
  23 static retro_video_refresh_t video_cb;
  24 static retro_input_poll_t input_poll_cb;
  25 static retro_input_state_t input_state_cb;
  26 static retro_environment_t environ_cb;
  27 static retro_audio_sample_batch_t audio_batch_cb;
  28
  29 static void *vout_buf;
  30 static int samples_sent, samples_to_send;
  31 static int plugins_opened;
  32
  33 /* PCSX ReARMed core calls and stuff */
  34 int in_type1, in_type2;
  35 int in_a1[2] = { 127, 127 }, in_a2[2] = { 127, 127 };
  36 int in_keystate;
  37 int in_enable_vibration;
  38
  39 static int vout_open(void)
  40 {
  41         return 0;
  42 }
  43
  44 static void vout_set_mode(int w, int h, int bpp)
  45 {
  46 }
  47
  48 /* FIXME: either teach PCSX to blit to RGB1555 or RetroArch to support RGB565 */
  49 static void convert(void *buf, size_t bytes)
  50 {
  51         unsigned int i, v, *p = buf;
  52
  53         for (i = 0; i < bytes / 4; i++) {
  54                 v = p[i];
  55                 p[i] = (v & 0x001f001f) | ((v >> 1) & 0x7fe07fe0);
  56         }
  57 }
  58
  59 static void vout_flip(const void *vram, int stride, int bgr24, int w, int h)
  60 {
  61         unsigned short *dest = vout_buf;
  62         const unsigned short *src = vram;
  63         int dstride = w, h1 = h;
  64
  65         if (vram == NULL) {
  66                 // blanking
  67                 memset(pl_vout_buf, 0, dstride * h * 2);
  68                 goto out;
  69         }
  70
  71         if (bgr24)
  72         {
  73                 // XXX: could we switch to RETRO_PIXEL_FORMAT_XRGB8888 here?
  74                 for (; h1-- > 0; dest += dstride, src += stride)
  75                 {
  76                         bgr888_to_rgb565(dest, src, w * 3);
  77                 }
  78         }
  79         else
  80         {
  81                 for (; h1-- > 0; dest += dstride, src += stride)
  82                 {
  83                         bgr555_to_rgb565(dest, src, w * 2);
  84                 }
  85         }
  86
  87
  88 out:
  89         convert(vout_buf, w * h * 2);
  90         video_cb(vout_buf, w, h, w * 2);
  91         pl_rearmed_cbs.flip_cnt++;
  92 }
  93
  94 static void vout_close(void)
  95 {
  96 }
  97
  98 struct rearmed_cbs pl_rearmed_cbs = {
  99         .pl_vout_open = vout_open,
 100         .pl_vout_set_mode = vout_set_mode,
 101         .pl_vout_flip = vout_flip,
 102         .pl_vout_close = vout_close,
 103         /* from psxcounters */
 104         .gpu_hcnt = &hSyncCount,
 105         .gpu_frame_count = &frame_counter,
 106 };
 107
 108 void pl_frame_limit(void)
 109 {
 110         /* called once per frame, make psxCpu->Execute() above return */
 111         stop = 1;
 112 }
 113
 114 void pl_timing_prepare(int is_pal)
 115 {
 116 }
 117
 118 void plat_trigger_vibrate(int is_strong)
 119 {
 120 }
 121
 122 void pl_update_gun(int *xn, int *xres, int *y, int *in)
 123 {
 124 }
 125
 126 /* sound calls */
 127 static int snd_init(void)
 128 {
 129         return 0;
 130 }
 131
 132 static void snd_finish(void)
 133 {
 134 }
 135
 136 static int snd_busy(void)
 137 {
 138         if (samples_to_send > samples_sent)
 139                 return 0; /* give more samples */
 140         else
 141                 return 1;
 142 }
 143
 144 static void snd_feed(void *buf, int bytes)
 145 {
 146         audio_batch_cb(buf, bytes / 4);
 147         samples_sent += bytes / 4;
 148 }
 149
 150 void out_register_libretro(struct out_driver *drv)
 151 {
 152         drv->name = "libretro";
 153         drv->init = snd_init;
 154         drv->finish = snd_finish;
 155         drv->busy = snd_busy;
 156         drv->feed = snd_feed;
 157 }
 158
 159 /* libretro */
 160 void retro_set_environment(retro_environment_t cb) { environ_cb = cb; }
 161 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
 162 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
 163 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
 164 void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
 165 void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
 166
 167 unsigned retro_api_version(void)
 168 {
 169         return RETRO_API_VERSION;
 170 }
 171
 172 void retro_set_controller_port_device(unsigned port, unsigned device)
 173 {
 174 }
 175
 176 void retro_get_system_info(struct retro_system_info *info)
 177 {
 178         memset(info, 0, sizeof(*info));
 179         info->library_name = "PCSX-ReARMed";
 180         info->library_version = REV;
 181         info->valid_extensions = "bin|cue|img|mdf|pbp|cbn";
 182         info->need_fullpath = true;
 183 }
 184
 185 void retro_get_system_av_info(struct retro_system_av_info *info)
 186 {
 187         memset(info, 0, sizeof(*info));
 188         info->timing.fps            = 60;
 189         info->timing.sample_rate    = 44100;
 190         info->geometry.base_width   = 320;
 191         info->geometry.base_height  = 240;
 192         info->geometry.max_width    = 640;
 193         info->geometry.max_height   = 512;
 194         info->geometry.aspect_ratio = 4.0 / 3.0;
 195 }
 196
 197 /* TODO */
 198 size_t retro_serialize_size(void)
 199 {
 200         return 0;
 201 }
 202
 203 bool retro_serialize(void *data, size_t size)
 204 {
 205         return false;
 206 }
 207
 208 bool retro_unserialize(const void *data, size_t size)
 209 {
 210         return false;
 211 }
 212
 213 void retro_cheat_reset(void)
 214 {
 215 }
 216
 217 void retro_cheat_set(unsigned index, bool enabled, const char *code)
 218 {
 219 }
 220
 221 bool retro_load_game(const struct retro_game_info *info)
 222 {
 223         if (plugins_opened) {
 224                 ClosePlugins();
 225                 plugins_opened = 0;
 226         }
 227
 228         set_cd_image(info->path);
 229
 230         /* have to reload after set_cd_image for correct cdr plugin */
 231         if (LoadPlugins() == -1) {
 232                 printf("faled to load plugins\n");
 233                 return false;
 234         }
 235
 236         plugins_opened = 1;
 237         NetOpened = 0;
 238
 239         if (OpenPlugins() == -1) {
 240                 printf("faled to open plugins\n");
 241                 return false;
 242         }
 243
 244         plugin_call_rearmed_cbs();
 245
 246         Config.PsxAuto = 1;
 247         if (CheckCdrom() == -1) {
 248                 printf("unsupported/invalid CD image: %s\n", info->path);
 249                 return false;
 250         }
 251
 252         SysReset();
 253
 254         if (LoadCdrom() == -1) {
 255                 printf("could not load CD-ROM!\n");
 256                 return false;
 257         }
 258         emu_on_new_cd();
 259
 260         return true;
 261 }
 262
 263 bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
 264 {
 265         return false;
 266 }
 267
 268 void retro_unload_game(void)
 269 {
 270 }
 271
 272 unsigned retro_get_region(void)
 273 {
 274         return RETRO_REGION_NTSC;
 275 }
 276
 277 void *retro_get_memory_data(unsigned id)
 278 {
 279         return NULL;
 280 }
 281
 282 size_t retro_get_memory_size(unsigned id)
 283 {
 284         return 0;
 285 }
 286
 287 void retro_reset(void)
 288 {
 289         SysReset();
 290 }
 291
 292 static const unsigned short retro_psx_map[] = {
 293         [RETRO_DEVICE_ID_JOYPAD_B]      = 1 << DKEY_CROSS,
 294         [RETRO_DEVICE_ID_JOYPAD_Y]      = 1 << DKEY_SQUARE,
 295         [RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << DKEY_SELECT,
 296         [RETRO_DEVICE_ID_JOYPAD_START]  = 1 << DKEY_START,
 297         [RETRO_DEVICE_ID_JOYPAD_UP]     = 1 << DKEY_UP,
 298         [RETRO_DEVICE_ID_JOYPAD_DOWN]   = 1 << DKEY_DOWN,
 299         [RETRO_DEVICE_ID_JOYPAD_LEFT]   = 1 << DKEY_LEFT,
 300         [RETRO_DEVICE_ID_JOYPAD_RIGHT]  = 1 << DKEY_RIGHT,
 301         [RETRO_DEVICE_ID_JOYPAD_A]      = 1 << DKEY_CIRCLE,
 302         [RETRO_DEVICE_ID_JOYPAD_X]      = 1 << DKEY_TRIANGLE,
 303         [RETRO_DEVICE_ID_JOYPAD_L]      = 1 << DKEY_L1,
 304         [RETRO_DEVICE_ID_JOYPAD_R]      = 1 << DKEY_R1,
 305         [RETRO_DEVICE_ID_JOYPAD_L2]     = 1 << DKEY_L2,
 306         [RETRO_DEVICE_ID_JOYPAD_R2]     = 1 << DKEY_R2,
 307         [RETRO_DEVICE_ID_JOYPAD_L3]     = 1 << DKEY_L3,
 308         [RETRO_DEVICE_ID_JOYPAD_R3]     = 1 << DKEY_R3,
 309 };
 310 #define RETRO_PSX_MAP_LEN (sizeof(retro_psx_map) / sizeof(retro_psx_map[0]))
 311
 312 void retro_run(void)
 313 {
 314         int i;
 315
 316         input_poll_cb();
 317         in_keystate = 0;
 318         for (i = 0; i < RETRO_PSX_MAP_LEN; i++)
 319                 if (input_state_cb(1, RETRO_DEVICE_JOYPAD, 0, i))
 320                         in_keystate |= retro_psx_map[i];
 321         in_keystate <<= 16;
 322         for (i = 0; i < RETRO_PSX_MAP_LEN; i++)
 323                 if (input_state_cb(0, RETRO_DEVICE_JOYPAD, 0, i))
 324                         in_keystate |= retro_psx_map[i];
 325
 326         stop = 0;
 327         psxCpu->Execute();
 328
 329         samples_to_send += 44100 / 60;
 330 }
 331
 332 void retro_init(void)
 333 {
 334         const char *bios[] = { "scph1001", "scph5501", "scph7001" };
 335         const char *dir;
 336         char path[256];
 337         FILE *f = NULL;
 338         int i, ret, level;
 339
 340         ret = emu_core_preinit();
 341         ret |= emu_core_init();
 342         if (ret != 0) {
 343                 printf("PCSX init failed, sorry\n");
 344                 exit(1);
 345         }
 346
 347         vout_buf = malloc(640 * 512 * 2);
 348
 349         if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir)
 350         {
 351                 snprintf(Config.BiosDir, sizeof(Config.BiosDir), "%s/", dir);
 352
 353                 for (i = 0; i < sizeof(bios) / sizeof(bios[0]); i++) {
 354                         snprintf(path, sizeof(path), "%s/%s.bin", dir, bios[i]);
 355                         f = fopen(path, "r");
 356                         if (f != NULL) {
 357                                 snprintf(Config.Bios, sizeof(Config.Bios), "%s.bin", bios[i]);
 358                                 break;
 359                         }
 360                 }
 361         }
 362         if (f != NULL) {
 363                 printf("found BIOS file: %s\n", Config.Bios);
 364                 fclose(f);
 365         }
 366         else
 367                 printf("no BIOS files found.\n");
 368
 369         level = 1;
 370         environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
 371 }
 372
 373 void retro_deinit(void)
 374 {
 375         SysClose();
 376         free(vout_buf);
 377         vout_buf = NULL;
 378 }
 379