2 * libretro core glue for PicoDrive
5 * This work is licensed under the terms of MAME license.
6 * See COPYING file in the top-level directory.
9 #define _GNU_SOURCE 1 // mremap
18 #include <sys/types.h>
22 #include <libkern/OSCacheControl.h>
25 #include <pico/pico_int.h>
26 #include <pico/state.h>
27 #include "common/input_pico.h"
28 #include "common/version.h"
31 static retro_log_printf_t log_cb;
32 static retro_video_refresh_t video_cb;
33 static retro_input_poll_t input_poll_cb;
34 static retro_input_state_t input_state_cb;
35 static retro_environment_t environ_cb;
36 static retro_audio_sample_batch_t audio_batch_cb;
38 #define VOUT_MAX_WIDTH 320
39 #define VOUT_MAX_HEIGHT 240
40 static void *vout_buf;
41 static int vout_width, vout_height, vout_offset;
43 static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
45 static void snd_write(int len);
53 /* functions called by the core */
55 void cache_flush_d_inval_i(void *start, void *end)
58 #if defined(__BLACKBERRY_QNX__)
59 msync(start, end - start, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
60 #elif defined(__MACH__)
61 size_t len = (char *)end - (char *)start;
62 sys_dcache_flush(start, len);
63 sys_icache_invalidate(start, len);
65 __clear_cache(start, end);
71 /* mmap() replacement for Windows
73 * Author: Mike Frysinger <vapier@gentoo.org>
74 * Placed into the public domain
78 * CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx
79 * CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx
80 * MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx
81 * UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
85 #define PROT_WRITE 0x2
86 /* This flag is only available in WinXP+ */
87 #ifdef FILE_MAP_EXECUTE
91 #define FILE_MAP_EXECUTE 0
94 #define MAP_SHARED 0x01
95 #define MAP_PRIVATE 0x02
96 #define MAP_ANONYMOUS 0x20
97 #define MAP_ANON MAP_ANONYMOUS
98 #define MAP_FAILED ((void *) -1)
100 #ifdef __USE_FILE_OFFSET64
101 # define DWORD_HI(x) (x >> 32)
102 # define DWORD_LO(x) ((x) & 0xffffffff)
104 # define DWORD_HI(x) (0)
105 # define DWORD_LO(x) (x)
108 static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
110 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
113 if (!(flags & MAP_ANON) || offset)
115 } else if (flags & MAP_ANON)
119 if (prot & PROT_WRITE) {
120 if (prot & PROT_EXEC)
121 flProtect = PAGE_EXECUTE_READWRITE;
123 flProtect = PAGE_READWRITE;
124 } else if (prot & PROT_EXEC) {
125 if (prot & PROT_READ)
126 flProtect = PAGE_EXECUTE_READ;
127 else if (prot & PROT_EXEC)
128 flProtect = PAGE_EXECUTE;
130 flProtect = PAGE_READONLY;
132 off_t end = length + offset;
135 mmap_fd = INVALID_HANDLE_VALUE;
137 mmap_fd = (HANDLE)_get_osfhandle(fd);
138 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
142 DWORD dwDesiredAccess;
143 if (prot & PROT_WRITE)
144 dwDesiredAccess = FILE_MAP_WRITE;
146 dwDesiredAccess = FILE_MAP_READ;
147 if (prot & PROT_EXEC)
148 dwDesiredAccess |= FILE_MAP_EXECUTE;
149 if (flags & MAP_PRIVATE)
150 dwDesiredAccess |= FILE_MAP_COPY;
151 void *ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
159 static void munmap(void *addr, size_t length)
161 UnmapViewOfFile(addr);
162 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
166 #ifndef MAP_ANONYMOUS
167 #define MAP_ANONYMOUS MAP_ANON
170 void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
172 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
176 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
177 if (ret == MAP_FAILED) {
179 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
183 if (addr != 0 && ret != (void *)addr) {
185 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
197 void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
200 void *ret = mremap(ptr, oldsize, newsize, 0);
201 if (ret == MAP_FAILED)
207 size_t preserve_size;
209 preserve_size = oldsize;
210 if (preserve_size > newsize)
211 preserve_size = newsize;
212 tmp = malloc(preserve_size);
215 memcpy(tmp, ptr, preserve_size);
217 munmap(ptr, oldsize);
218 ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
219 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
220 if (ret == MAP_FAILED) {
224 memcpy(ret, tmp, preserve_size);
230 void plat_munmap(void *ptr, size_t size)
236 int plat_mem_set_exec(void *ptr, size_t size)
239 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
240 if (ret == 0 && log_cb)
241 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
243 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
244 if (ret != 0 && log_cb)
245 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
250 void emu_video_mode_change(int start_line, int line_count, int is_32cols)
252 memset(vout_buf, 0, 320 * 240 * 2);
253 vout_width = is_32cols ? 256 : 320;
254 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
256 vout_height = line_count;
257 vout_offset = vout_width * start_line;
260 void emu_32x_startup(void)
264 void lprintf(const char *fmt, ...)
266 /* TODO - add 'level' param for warning/error messages? */
268 log_cb(RETRO_LOG_INFO, fmt);
272 void retro_set_environment(retro_environment_t cb)
274 static const struct retro_variable vars[] = {
275 //{ "region", "Region; Auto|NTSC|PAL" },
276 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
277 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
278 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
279 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
281 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
288 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
291 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
292 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
293 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
294 void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
295 void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
297 unsigned retro_api_version(void)
299 return RETRO_API_VERSION;
302 void retro_set_controller_port_device(unsigned port, unsigned device)
306 void retro_get_system_info(struct retro_system_info *info)
308 memset(info, 0, sizeof(*info));
309 info->library_name = "PicoDrive";
310 info->library_version = VERSION;
311 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
312 info->need_fullpath = true;
315 void retro_get_system_av_info(struct retro_system_av_info *info)
317 memset(info, 0, sizeof(*info));
318 info->timing.fps = Pico.m.pal ? 50 : 60;
319 info->timing.sample_rate = 44100;
320 info->geometry.base_width = 320;
321 info->geometry.base_height = vout_height;
322 info->geometry.max_width = VOUT_MAX_WIDTH;
323 info->geometry.max_height = VOUT_MAX_HEIGHT;
324 info->geometry.aspect_ratio = 0.0f;
328 struct savestate_state {
329 const char *load_buf;
335 size_t state_read(void *p, size_t size, size_t nmemb, void *file)
337 struct savestate_state *state = file;
338 size_t bsize = size * nmemb;
340 if (state->pos + bsize > state->size) {
342 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
343 state->pos + bsize, state->size);
344 bsize = state->size - state->pos;
349 memcpy(p, state->load_buf + state->pos, bsize);
354 size_t state_write(void *p, size_t size, size_t nmemb, void *file)
356 struct savestate_state *state = file;
357 size_t bsize = size * nmemb;
359 if (state->pos + bsize > state->size) {
361 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
362 state->pos + bsize, state->size);
363 bsize = state->size - state->pos;
368 memcpy(state->save_buf + state->pos, p, bsize);
373 size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
375 struct savestate_state *state = file;
376 size_t bsize = size * nmemb;
382 size_t state_eof(void *file)
384 struct savestate_state *state = file;
386 return state->pos >= state->size;
389 int state_fseek(void *file, long offset, int whence)
391 struct savestate_state *state = file;
398 state->pos += offset;
401 state->pos = state->size + offset;
404 return (int)state->pos;
407 /* savestate sizes vary wildly depending if cd/32x or
408 * carthw is active, so run the whole thing to get size */
409 size_t retro_serialize_size(void)
411 struct savestate_state state = { 0, };
414 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
421 bool retro_serialize(void *data, size_t size)
423 struct savestate_state state = { 0, };
426 state.save_buf = data;
430 ret = PicoStateFP(&state, 1, NULL, state_write,
435 bool retro_unserialize(const void *data, size_t size)
437 struct savestate_state state = { 0, };
440 state.load_buf = data;
444 ret = PicoStateFP(&state, 0, state_read, NULL,
445 state_eof, state_fseek);
450 void retro_cheat_reset(void)
454 void retro_cheat_set(unsigned index, bool enabled, const char *code)
458 /* multidisk support */
459 static bool disk_ejected;
460 static unsigned int disk_current_index;
461 static unsigned int disk_count;
462 static struct disks_state {
466 static bool disk_set_eject_state(bool ejected)
469 disk_ejected = ejected;
473 static bool disk_get_eject_state(void)
478 static unsigned int disk_get_image_index(void)
480 return disk_current_index;
483 static bool disk_set_image_index(unsigned int index)
485 enum cd_img_type cd_type;
488 if (index >= sizeof(disks) / sizeof(disks[0]))
491 if (disks[index].fname == NULL) {
493 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
495 // RetroArch specifies "no disk" with index == count,
496 // so don't fail here..
497 disk_current_index = index;
502 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
506 cd_type = PicoCdCheck(disks[index].fname, NULL);
507 if (cd_type != CIT_NOT_CD)
508 ret = cdd_load(disks[index].fname, cd_type);
511 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
515 disk_current_index = index;
519 static unsigned int disk_get_num_images(void)
524 static bool disk_replace_image_index(unsigned index,
525 const struct retro_game_info *info)
529 if (index >= sizeof(disks) / sizeof(disks[0]))
532 if (disks[index].fname != NULL)
533 free(disks[index].fname);
534 disks[index].fname = NULL;
537 disks[index].fname = strdup(info->path);
538 if (index == disk_current_index)
539 ret = disk_set_image_index(index);
545 static bool disk_add_image_index(void)
547 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
554 static struct retro_disk_control_callback disk_control = {
555 .set_eject_state = disk_set_eject_state,
556 .get_eject_state = disk_get_eject_state,
557 .get_image_index = disk_get_image_index,
558 .set_image_index = disk_set_image_index,
559 .get_num_images = disk_get_num_images,
560 .replace_image_index = disk_replace_image_index,
561 .add_image_index = disk_add_image_index,
564 static void disk_tray_open(void)
567 log_cb(RETRO_LOG_INFO, "cd tray open\n");
571 static void disk_tray_close(void)
574 log_cb(RETRO_LOG_INFO, "cd tray close\n");
579 static const char * const biosfiles_us[] = {
580 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
582 static const char * const biosfiles_eu[] = {
583 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
585 static const char * const biosfiles_jp[] = {
586 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
589 static void make_system_path(char *buf, size_t buf_size,
590 const char *name, const char *ext)
592 const char *dir = NULL;
594 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
595 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
598 snprintf(buf, buf_size, "%s%s", name, ext);
602 static const char *find_bios(int *region, const char *cd_fname)
604 const char * const *files;
605 static char path[256];
609 if (*region == 4) { // US
610 files = biosfiles_us;
611 count = sizeof(biosfiles_us) / sizeof(char *);
612 } else if (*region == 8) { // EU
613 files = biosfiles_eu;
614 count = sizeof(biosfiles_eu) / sizeof(char *);
615 } else if (*region == 1 || *region == 2) {
616 files = biosfiles_jp;
617 count = sizeof(biosfiles_jp) / sizeof(char *);
622 for (i = 0; i < count; i++)
624 make_system_path(path, sizeof(path), files[i], ".bin");
625 f = fopen(path, "rb");
629 make_system_path(path, sizeof(path), files[i], ".zip");
630 f = fopen(path, "rb");
637 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
645 bool retro_load_game(const struct retro_game_info *info)
647 enum media_type_e media_type;
648 static char carthw_path[256];
651 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
652 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
654 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
658 if (info == NULL || info->path == NULL) {
660 log_cb(RETRO_LOG_ERROR, "info->path required\n");
664 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
665 if (disks[i].fname != NULL) {
666 free(disks[i].fname);
667 disks[i].fname = NULL;
671 disk_current_index = 0;
673 disks[0].fname = strdup(info->path);
675 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
677 media_type = PicoLoadMedia(info->path, carthw_path,
680 switch (media_type) {
683 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
687 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
689 case PM_BAD_CD_NO_BIOS:
691 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
695 log_cb(RETRO_LOG_ERROR, "Load error\n");
703 PicoWriteSound = snd_write;
704 memset(sndBuffer, 0, sizeof(sndBuffer));
711 bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
716 void retro_unload_game(void)
720 unsigned retro_get_region(void)
722 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
725 void *retro_get_memory_data(unsigned id)
727 if (id != RETRO_MEMORY_SAVE_RAM)
730 if (PicoAHW & PAHW_MCD)
731 return Pico_mcd->bram;
736 size_t retro_get_memory_size(unsigned id)
741 if (id != RETRO_MEMORY_SAVE_RAM)
744 if (PicoAHW & PAHW_MCD)
748 if (Pico.m.frame_count == 0)
751 // if game doesn't write to sram, don't report it to
752 // libretro so that RA doesn't write out zeroed .srm
753 for (i = 0, sum = 0; i < SRam.size; i++)
756 return (sum != 0) ? SRam.size : 0;
759 void retro_reset(void)
764 static const unsigned short retro_pico_map[] = {
765 [RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
766 [RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
767 [RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
768 [RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
769 [RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
770 [RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
771 [RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
772 [RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
773 [RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
774 [RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
775 [RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
776 [RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
778 #define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
780 static void snd_write(int len)
782 audio_batch_cb(PsndOut, len / 4);
785 static enum input_device input_name_to_val(const char *name)
787 if (strcmp(name, "3 button pad") == 0)
788 return PICO_INPUT_PAD_3BTN;
789 if (strcmp(name, "6 button pad") == 0)
790 return PICO_INPUT_PAD_6BTN;
791 if (strcmp(name, "None") == 0)
792 return PICO_INPUT_NOTHING;
795 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
796 return PICO_INPUT_PAD_3BTN;
799 static void update_variables(void)
801 struct retro_variable var;
804 var.key = "picodrive_input1";
805 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
806 PicoSetInputDevice(0, input_name_to_val(var.value));
809 var.key = "picodrive_input2";
810 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
811 PicoSetInputDevice(1, input_name_to_val(var.value));
814 var.key = "picodrive_sprlim";
815 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
816 if (strcmp(var.value, "enabled") == 0)
817 PicoOpt |= POPT_DIS_SPRITE_LIM;
819 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
823 var.key = "picodrive_ramcart";
824 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
825 if (strcmp(var.value, "enabled") == 0)
826 PicoOpt |= POPT_EN_MCD_RAMCART;
828 PicoOpt &= ~POPT_EN_MCD_RAMCART;
833 var.key = "picodrive_drc";
834 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
835 if (strcmp(var.value, "enabled") == 0)
836 PicoOpt |= POPT_EN_DRC;
838 PicoOpt &= ~POPT_EN_DRC;
845 bool updated = false;
848 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
853 PicoPad[0] = PicoPad[1] = 0;
854 for (pad = 0; pad < 2; pad++)
855 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
856 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
857 PicoPad[pad] |= retro_pico_map[i];
861 video_cb((short *)vout_buf + vout_offset,
862 vout_width, vout_height, vout_width * 2);
865 void retro_init(void)
867 struct retro_log_callback log;
871 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
873 environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log);
877 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
879 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
880 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
881 | POPT_EN_32X|POPT_EN_PWM
882 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
884 PicoOpt |= POPT_EN_DRC;
887 PicoAutoRgnOrder = 0x184; // US, EU, JP
891 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
894 PicoDrawSetOutFormat(PDF_RGB555, 0);
895 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
897 //PicoMessage = plat_status_msg_busy_next;
898 PicoMCDopenTray = disk_tray_open;
899 PicoMCDcloseTray = disk_tray_close;
904 void retro_deinit(void)