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, ...)
269 vsprintf(buffer, fmt, ap);
270 /* TODO - add 'level' param for warning/error messages? */
272 log_cb(RETRO_LOG_INFO, "%s\n", fmt);
276 void retro_set_environment(retro_environment_t cb)
278 static const struct retro_variable vars[] = {
279 //{ "region", "Region; Auto|NTSC|PAL" },
280 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
281 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
282 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
283 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
285 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
292 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
295 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
296 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
297 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
298 void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
299 void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
301 unsigned retro_api_version(void)
303 return RETRO_API_VERSION;
306 void retro_set_controller_port_device(unsigned port, unsigned device)
310 void retro_get_system_info(struct retro_system_info *info)
312 memset(info, 0, sizeof(*info));
313 info->library_name = "PicoDrive";
314 info->library_version = VERSION;
315 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
316 info->need_fullpath = true;
319 void retro_get_system_av_info(struct retro_system_av_info *info)
321 memset(info, 0, sizeof(*info));
322 info->timing.fps = Pico.m.pal ? 50 : 60;
323 info->timing.sample_rate = 44100;
324 info->geometry.base_width = 320;
325 info->geometry.base_height = vout_height;
326 info->geometry.max_width = VOUT_MAX_WIDTH;
327 info->geometry.max_height = VOUT_MAX_HEIGHT;
328 info->geometry.aspect_ratio = 0.0f;
332 struct savestate_state {
333 const char *load_buf;
339 size_t state_read(void *p, size_t size, size_t nmemb, void *file)
341 struct savestate_state *state = file;
342 size_t bsize = size * nmemb;
344 if (state->pos + bsize > state->size) {
346 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
347 state->pos + bsize, state->size);
348 bsize = state->size - state->pos;
353 memcpy(p, state->load_buf + state->pos, bsize);
358 size_t state_write(void *p, size_t size, size_t nmemb, void *file)
360 struct savestate_state *state = file;
361 size_t bsize = size * nmemb;
363 if (state->pos + bsize > state->size) {
365 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
366 state->pos + bsize, state->size);
367 bsize = state->size - state->pos;
372 memcpy(state->save_buf + state->pos, p, bsize);
377 size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
379 struct savestate_state *state = file;
380 size_t bsize = size * nmemb;
386 size_t state_eof(void *file)
388 struct savestate_state *state = file;
390 return state->pos >= state->size;
393 int state_fseek(void *file, long offset, int whence)
395 struct savestate_state *state = file;
402 state->pos += offset;
405 state->pos = state->size + offset;
408 return (int)state->pos;
411 /* savestate sizes vary wildly depending if cd/32x or
412 * carthw is active, so run the whole thing to get size */
413 size_t retro_serialize_size(void)
415 struct savestate_state state = { 0, };
418 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
425 bool retro_serialize(void *data, size_t size)
427 struct savestate_state state = { 0, };
430 state.save_buf = data;
434 ret = PicoStateFP(&state, 1, NULL, state_write,
439 bool retro_unserialize(const void *data, size_t size)
441 struct savestate_state state = { 0, };
444 state.load_buf = data;
448 ret = PicoStateFP(&state, 0, state_read, NULL,
449 state_eof, state_fseek);
454 void retro_cheat_reset(void)
458 void retro_cheat_set(unsigned index, bool enabled, const char *code)
462 /* multidisk support */
463 static bool disk_ejected;
464 static unsigned int disk_current_index;
465 static unsigned int disk_count;
466 static struct disks_state {
470 static bool disk_set_eject_state(bool ejected)
473 disk_ejected = ejected;
477 static bool disk_get_eject_state(void)
482 static unsigned int disk_get_image_index(void)
484 return disk_current_index;
487 static bool disk_set_image_index(unsigned int index)
489 enum cd_img_type cd_type;
492 if (index >= sizeof(disks) / sizeof(disks[0]))
495 if (disks[index].fname == NULL) {
497 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
499 // RetroArch specifies "no disk" with index == count,
500 // so don't fail here..
501 disk_current_index = index;
506 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
510 cd_type = PicoCdCheck(disks[index].fname, NULL);
511 if (cd_type != CIT_NOT_CD)
512 ret = cdd_load(disks[index].fname, cd_type);
515 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
519 disk_current_index = index;
523 static unsigned int disk_get_num_images(void)
528 static bool disk_replace_image_index(unsigned index,
529 const struct retro_game_info *info)
533 if (index >= sizeof(disks) / sizeof(disks[0]))
536 if (disks[index].fname != NULL)
537 free(disks[index].fname);
538 disks[index].fname = NULL;
541 disks[index].fname = strdup(info->path);
542 if (index == disk_current_index)
543 ret = disk_set_image_index(index);
549 static bool disk_add_image_index(void)
551 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
558 static struct retro_disk_control_callback disk_control = {
559 .set_eject_state = disk_set_eject_state,
560 .get_eject_state = disk_get_eject_state,
561 .get_image_index = disk_get_image_index,
562 .set_image_index = disk_set_image_index,
563 .get_num_images = disk_get_num_images,
564 .replace_image_index = disk_replace_image_index,
565 .add_image_index = disk_add_image_index,
568 static void disk_tray_open(void)
571 log_cb(RETRO_LOG_INFO, "cd tray open\n");
575 static void disk_tray_close(void)
578 log_cb(RETRO_LOG_INFO, "cd tray close\n");
583 static const char * const biosfiles_us[] = {
584 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
586 static const char * const biosfiles_eu[] = {
587 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
589 static const char * const biosfiles_jp[] = {
590 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
593 static void make_system_path(char *buf, size_t buf_size,
594 const char *name, const char *ext)
596 const char *dir = NULL;
598 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
599 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
602 snprintf(buf, buf_size, "%s%s", name, ext);
606 static const char *find_bios(int *region, const char *cd_fname)
608 const char * const *files;
609 static char path[256];
613 if (*region == 4) { // US
614 files = biosfiles_us;
615 count = sizeof(biosfiles_us) / sizeof(char *);
616 } else if (*region == 8) { // EU
617 files = biosfiles_eu;
618 count = sizeof(biosfiles_eu) / sizeof(char *);
619 } else if (*region == 1 || *region == 2) {
620 files = biosfiles_jp;
621 count = sizeof(biosfiles_jp) / sizeof(char *);
626 for (i = 0; i < count; i++)
628 make_system_path(path, sizeof(path), files[i], ".bin");
629 f = fopen(path, "rb");
633 make_system_path(path, sizeof(path), files[i], ".zip");
634 f = fopen(path, "rb");
641 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
649 bool retro_load_game(const struct retro_game_info *info)
651 enum media_type_e media_type;
652 static char carthw_path[256];
655 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
656 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
658 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
662 if (info == NULL || info->path == NULL) {
664 log_cb(RETRO_LOG_ERROR, "info->path required\n");
668 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
669 if (disks[i].fname != NULL) {
670 free(disks[i].fname);
671 disks[i].fname = NULL;
675 disk_current_index = 0;
677 disks[0].fname = strdup(info->path);
679 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
681 media_type = PicoLoadMedia(info->path, carthw_path,
684 switch (media_type) {
687 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
691 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
693 case PM_BAD_CD_NO_BIOS:
695 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
699 log_cb(RETRO_LOG_ERROR, "Load error\n");
707 PicoWriteSound = snd_write;
708 memset(sndBuffer, 0, sizeof(sndBuffer));
715 bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
720 void retro_unload_game(void)
724 unsigned retro_get_region(void)
726 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
729 void *retro_get_memory_data(unsigned id)
731 if (id != RETRO_MEMORY_SAVE_RAM)
734 if (PicoAHW & PAHW_MCD)
735 return Pico_mcd->bram;
740 size_t retro_get_memory_size(unsigned id)
745 if (id != RETRO_MEMORY_SAVE_RAM)
748 if (PicoAHW & PAHW_MCD)
752 if (Pico.m.frame_count == 0)
755 // if game doesn't write to sram, don't report it to
756 // libretro so that RA doesn't write out zeroed .srm
757 for (i = 0, sum = 0; i < SRam.size; i++)
760 return (sum != 0) ? SRam.size : 0;
763 void retro_reset(void)
768 static const unsigned short retro_pico_map[] = {
769 [RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
770 [RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
771 [RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
772 [RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
773 [RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
774 [RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
775 [RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
776 [RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
777 [RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
778 [RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
779 [RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
780 [RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
782 #define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
784 static void snd_write(int len)
786 audio_batch_cb(PsndOut, len / 4);
789 static enum input_device input_name_to_val(const char *name)
791 if (strcmp(name, "3 button pad") == 0)
792 return PICO_INPUT_PAD_3BTN;
793 if (strcmp(name, "6 button pad") == 0)
794 return PICO_INPUT_PAD_6BTN;
795 if (strcmp(name, "None") == 0)
796 return PICO_INPUT_NOTHING;
799 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
800 return PICO_INPUT_PAD_3BTN;
803 static void update_variables(void)
805 struct retro_variable var;
808 var.key = "picodrive_input1";
809 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
810 PicoSetInputDevice(0, input_name_to_val(var.value));
813 var.key = "picodrive_input2";
814 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
815 PicoSetInputDevice(1, input_name_to_val(var.value));
818 var.key = "picodrive_sprlim";
819 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
820 if (strcmp(var.value, "enabled") == 0)
821 PicoOpt |= POPT_DIS_SPRITE_LIM;
823 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
827 var.key = "picodrive_ramcart";
828 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
829 if (strcmp(var.value, "enabled") == 0)
830 PicoOpt |= POPT_EN_MCD_RAMCART;
832 PicoOpt &= ~POPT_EN_MCD_RAMCART;
837 var.key = "picodrive_drc";
838 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
839 if (strcmp(var.value, "enabled") == 0)
840 PicoOpt |= POPT_EN_DRC;
842 PicoOpt &= ~POPT_EN_DRC;
849 bool updated = false;
852 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
857 PicoPad[0] = PicoPad[1] = 0;
858 for (pad = 0; pad < 2; pad++)
859 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
860 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
861 PicoPad[pad] |= retro_pico_map[i];
865 video_cb((short *)vout_buf + vout_offset,
866 vout_width, vout_height, vout_width * 2);
869 void retro_init(void)
871 struct retro_log_callback log;
875 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
877 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
882 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
884 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
885 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
886 | POPT_EN_32X|POPT_EN_PWM
887 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
889 PicoOpt |= POPT_EN_DRC;
892 PicoAutoRgnOrder = 0x184; // US, EU, JP
896 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
899 PicoDrawSetOutFormat(PDF_RGB555, 0);
900 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
902 //PicoMessage = plat_status_msg_busy_next;
903 PicoMCDopenTray = disk_tray_open;
904 PicoMCDcloseTray = disk_tray_close;
909 void retro_deinit(void)