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
20 #include <sys/types.h>
24 #include <libkern/OSCacheControl.h>
27 #include <pico/pico_int.h>
28 #include <pico/state.h>
29 #include "../common/input_pico.h"
30 #include "../common/version.h"
33 static retro_log_printf_t log_cb;
34 static retro_video_refresh_t video_cb;
35 static retro_input_poll_t input_poll_cb;
36 static retro_input_state_t input_state_cb;
37 static retro_environment_t environ_cb;
38 static retro_audio_sample_batch_t audio_batch_cb;
40 #define VOUT_MAX_WIDTH 320
41 #define VOUT_MAX_HEIGHT 240
42 static void *vout_buf;
43 static int vout_width, vout_height, vout_offset;
46 static short sndBuffer[2*44100/50];
48 static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
51 static void snd_write(int len);
59 /* functions called by the core */
61 void cache_flush_d_inval_i(void *start, void *end)
64 #if defined(__BLACKBERRY_QNX__)
65 msync(start, end - start, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
66 #elif defined(__MACH__)
67 size_t len = (char *)end - (char *)start;
68 sys_dcache_flush(start, len);
69 sys_icache_invalidate(start, len);
71 __clear_cache(start, end);
77 /* mmap() replacement for Windows
79 * Author: Mike Frysinger <vapier@gentoo.org>
80 * Placed into the public domain
84 * CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx
85 * CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx
86 * MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx
87 * UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
91 #define PROT_WRITE 0x2
92 /* This flag is only available in WinXP+ */
93 #ifdef FILE_MAP_EXECUTE
97 #define FILE_MAP_EXECUTE 0
100 #define MAP_SHARED 0x01
101 #define MAP_PRIVATE 0x02
102 #define MAP_ANONYMOUS 0x20
103 #define MAP_ANON MAP_ANONYMOUS
104 #define MAP_FAILED ((void *) -1)
106 #ifdef __USE_FILE_OFFSET64
107 # define DWORD_HI(x) (x >> 32)
108 # define DWORD_LO(x) ((x) & 0xffffffff)
110 # define DWORD_HI(x) (0)
111 # define DWORD_LO(x) (x)
114 static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
116 uint32_t flProtect, dwDesiredAccess;
121 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
124 if (!(flags & MAP_ANON) || offset)
126 } else if (flags & MAP_ANON)
129 if (prot & PROT_WRITE) {
130 if (prot & PROT_EXEC)
131 flProtect = PAGE_EXECUTE_READWRITE;
133 flProtect = PAGE_READWRITE;
134 } else if (prot & PROT_EXEC) {
135 if (prot & PROT_READ)
136 flProtect = PAGE_EXECUTE_READ;
137 else if (prot & PROT_EXEC)
138 flProtect = PAGE_EXECUTE;
140 flProtect = PAGE_READONLY;
142 end = length + offset;
145 mmap_fd = INVALID_HANDLE_VALUE;
147 mmap_fd = (HANDLE)_get_osfhandle(fd);
148 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
152 if (prot & PROT_WRITE)
153 dwDesiredAccess = FILE_MAP_WRITE;
155 dwDesiredAccess = FILE_MAP_READ;
156 if (prot & PROT_EXEC)
157 dwDesiredAccess |= FILE_MAP_EXECUTE;
158 if (flags & MAP_PRIVATE)
159 dwDesiredAccess |= FILE_MAP_COPY;
160 ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
168 static void munmap(void *addr, size_t length)
170 UnmapViewOfFile(addr);
171 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
173 #elif defined(NO_MMAP)
174 #define PROT_EXEC 0x04
178 #define MAP_PRIVATE 0
179 #define MAP_ANONYMOUS 0
181 void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off)
186 void munmap(void *base_addr, size_t len)
191 int mprotect(void *addr, size_t len, int prot)
193 /* stub - not really needed at this point since this codepath has no dynarecs */
199 #ifndef MAP_ANONYMOUS
200 #define MAP_ANONYMOUS MAP_ANON
203 void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
205 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
209 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
210 if (ret == MAP_FAILED) {
212 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
216 if (addr != 0 && ret != (void *)addr) {
218 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
230 void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
233 void *ret = mremap(ptr, oldsize, newsize, 0);
234 if (ret == MAP_FAILED)
240 size_t preserve_size;
242 preserve_size = oldsize;
243 if (preserve_size > newsize)
244 preserve_size = newsize;
245 tmp = malloc(preserve_size);
248 memcpy(tmp, ptr, preserve_size);
250 munmap(ptr, oldsize);
251 ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
252 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
253 if (ret == MAP_FAILED) {
257 memcpy(ret, tmp, preserve_size);
263 void plat_munmap(void *ptr, size_t size)
269 int plat_mem_set_exec(void *ptr, size_t size)
272 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
273 if (ret == 0 && log_cb)
274 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
276 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
277 if (ret != 0 && log_cb)
278 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
283 void emu_video_mode_change(int start_line, int line_count, int is_32cols)
285 memset(vout_buf, 0, 320 * 240 * 2);
286 vout_width = is_32cols ? 256 : 320;
287 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
289 vout_height = line_count;
290 vout_offset = vout_width * start_line;
293 void emu_32x_startup(void)
297 void lprintf(const char *fmt, ...)
302 vsprintf(buffer, fmt, ap);
303 /* TODO - add 'level' param for warning/error messages? */
305 log_cb(RETRO_LOG_INFO, "%s\n", fmt);
309 void retro_set_environment(retro_environment_t cb)
311 static const struct retro_variable vars[] = {
312 //{ "region", "Region; Auto|NTSC|PAL" },
313 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
314 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
315 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
316 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
318 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
325 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
328 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
329 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
330 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
331 void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
332 void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
334 unsigned retro_api_version(void)
336 return RETRO_API_VERSION;
339 void retro_set_controller_port_device(unsigned port, unsigned device)
343 void retro_get_system_info(struct retro_system_info *info)
345 memset(info, 0, sizeof(*info));
346 info->library_name = "PicoDrive";
347 info->library_version = VERSION;
348 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
349 info->need_fullpath = true;
352 void retro_get_system_av_info(struct retro_system_av_info *info)
354 memset(info, 0, sizeof(*info));
355 info->timing.fps = Pico.m.pal ? 50 : 60;
356 info->timing.sample_rate = 44100;
357 info->geometry.base_width = 320;
358 info->geometry.base_height = vout_height;
359 info->geometry.max_width = VOUT_MAX_WIDTH;
360 info->geometry.max_height = VOUT_MAX_HEIGHT;
361 info->geometry.aspect_ratio = 0.0f;
365 struct savestate_state {
366 const char *load_buf;
372 size_t state_read(void *p, size_t size, size_t nmemb, void *file)
374 struct savestate_state *state = file;
375 size_t bsize = size * nmemb;
377 if (state->pos + bsize > state->size) {
379 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
380 state->pos + bsize, state->size);
381 bsize = state->size - state->pos;
386 memcpy(p, state->load_buf + state->pos, bsize);
391 size_t state_write(void *p, size_t size, size_t nmemb, void *file)
393 struct savestate_state *state = file;
394 size_t bsize = size * nmemb;
396 if (state->pos + bsize > state->size) {
398 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
399 state->pos + bsize, state->size);
400 bsize = state->size - state->pos;
405 memcpy(state->save_buf + state->pos, p, bsize);
410 size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
412 struct savestate_state *state = file;
413 size_t bsize = size * nmemb;
419 size_t state_eof(void *file)
421 struct savestate_state *state = file;
423 return state->pos >= state->size;
426 int state_fseek(void *file, long offset, int whence)
428 struct savestate_state *state = file;
435 state->pos += offset;
438 state->pos = state->size + offset;
441 return (int)state->pos;
444 /* savestate sizes vary wildly depending if cd/32x or
445 * carthw is active, so run the whole thing to get size */
446 size_t retro_serialize_size(void)
448 struct savestate_state state = { 0, };
451 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
458 bool retro_serialize(void *data, size_t size)
460 struct savestate_state state = { 0, };
463 state.save_buf = data;
467 ret = PicoStateFP(&state, 1, NULL, state_write,
472 bool retro_unserialize(const void *data, size_t size)
474 struct savestate_state state = { 0, };
477 state.load_buf = data;
481 ret = PicoStateFP(&state, 0, state_read, NULL,
482 state_eof, state_fseek);
487 void retro_cheat_reset(void)
491 void retro_cheat_set(unsigned index, bool enabled, const char *code)
495 /* multidisk support */
496 static bool disk_ejected;
497 static unsigned int disk_current_index;
498 static unsigned int disk_count;
499 static struct disks_state {
503 static bool disk_set_eject_state(bool ejected)
506 disk_ejected = ejected;
510 static bool disk_get_eject_state(void)
515 static unsigned int disk_get_image_index(void)
517 return disk_current_index;
520 static bool disk_set_image_index(unsigned int index)
522 enum cd_img_type cd_type;
525 if (index >= sizeof(disks) / sizeof(disks[0]))
528 if (disks[index].fname == NULL) {
530 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
532 // RetroArch specifies "no disk" with index == count,
533 // so don't fail here..
534 disk_current_index = index;
539 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
543 cd_type = PicoCdCheck(disks[index].fname, NULL);
544 if (cd_type != CIT_NOT_CD)
545 ret = cdd_load(disks[index].fname, cd_type);
548 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
552 disk_current_index = index;
556 static unsigned int disk_get_num_images(void)
561 static bool disk_replace_image_index(unsigned index,
562 const struct retro_game_info *info)
566 if (index >= sizeof(disks) / sizeof(disks[0]))
569 if (disks[index].fname != NULL)
570 free(disks[index].fname);
571 disks[index].fname = NULL;
574 disks[index].fname = strdup(info->path);
575 if (index == disk_current_index)
576 ret = disk_set_image_index(index);
582 static bool disk_add_image_index(void)
584 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
591 static struct retro_disk_control_callback disk_control = {
592 disk_set_eject_state,
593 disk_get_eject_state,
594 disk_get_image_index,
595 disk_set_image_index,
597 disk_replace_image_index,
598 disk_add_image_index,
601 static void disk_tray_open(void)
604 log_cb(RETRO_LOG_INFO, "cd tray open\n");
608 static void disk_tray_close(void)
611 log_cb(RETRO_LOG_INFO, "cd tray close\n");
616 static const char * const biosfiles_us[] = {
617 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
619 static const char * const biosfiles_eu[] = {
620 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
622 static const char * const biosfiles_jp[] = {
623 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
626 static void make_system_path(char *buf, size_t buf_size,
627 const char *name, const char *ext)
629 const char *dir = NULL;
631 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
632 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
635 snprintf(buf, buf_size, "%s%s", name, ext);
639 static const char *find_bios(int *region, const char *cd_fname)
641 const char * const *files;
642 static char path[256];
646 if (*region == 4) { // US
647 files = biosfiles_us;
648 count = sizeof(biosfiles_us) / sizeof(char *);
649 } else if (*region == 8) { // EU
650 files = biosfiles_eu;
651 count = sizeof(biosfiles_eu) / sizeof(char *);
652 } else if (*region == 1 || *region == 2) {
653 files = biosfiles_jp;
654 count = sizeof(biosfiles_jp) / sizeof(char *);
659 for (i = 0; i < count; i++)
661 make_system_path(path, sizeof(path), files[i], ".bin");
662 f = fopen(path, "rb");
666 make_system_path(path, sizeof(path), files[i], ".zip");
667 f = fopen(path, "rb");
674 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
682 bool retro_load_game(const struct retro_game_info *info)
684 enum media_type_e media_type;
685 static char carthw_path[256];
688 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
689 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
691 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
695 if (info == NULL || info->path == NULL) {
697 log_cb(RETRO_LOG_ERROR, "info->path required\n");
701 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
702 if (disks[i].fname != NULL) {
703 free(disks[i].fname);
704 disks[i].fname = NULL;
708 disk_current_index = 0;
710 disks[0].fname = strdup(info->path);
712 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
714 media_type = PicoLoadMedia(info->path, carthw_path,
717 switch (media_type) {
720 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
724 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
726 case PM_BAD_CD_NO_BIOS:
728 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
732 log_cb(RETRO_LOG_ERROR, "Load error\n");
740 PicoWriteSound = snd_write;
741 memset(sndBuffer, 0, sizeof(sndBuffer));
748 bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
753 void retro_unload_game(void)
757 unsigned retro_get_region(void)
759 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
762 void *retro_get_memory_data(unsigned id)
764 if (id != RETRO_MEMORY_SAVE_RAM)
767 if (PicoAHW & PAHW_MCD)
768 return Pico_mcd->bram;
773 size_t retro_get_memory_size(unsigned id)
778 if (id != RETRO_MEMORY_SAVE_RAM)
781 if (PicoAHW & PAHW_MCD)
785 if (Pico.m.frame_count == 0)
788 // if game doesn't write to sram, don't report it to
789 // libretro so that RA doesn't write out zeroed .srm
790 for (i = 0, sum = 0; i < SRam.size; i++)
793 return (sum != 0) ? SRam.size : 0;
796 void retro_reset(void)
801 static const unsigned short retro_pico_map[] = {
815 #define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
817 static void snd_write(int len)
819 audio_batch_cb(PsndOut, len / 4);
822 static enum input_device input_name_to_val(const char *name)
824 if (strcmp(name, "3 button pad") == 0)
825 return PICO_INPUT_PAD_3BTN;
826 if (strcmp(name, "6 button pad") == 0)
827 return PICO_INPUT_PAD_6BTN;
828 if (strcmp(name, "None") == 0)
829 return PICO_INPUT_NOTHING;
832 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
833 return PICO_INPUT_PAD_3BTN;
836 static void update_variables(void)
838 struct retro_variable var;
841 var.key = "picodrive_input1";
842 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
843 PicoSetInputDevice(0, input_name_to_val(var.value));
846 var.key = "picodrive_input2";
847 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
848 PicoSetInputDevice(1, input_name_to_val(var.value));
851 var.key = "picodrive_sprlim";
852 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
853 if (strcmp(var.value, "enabled") == 0)
854 PicoOpt |= POPT_DIS_SPRITE_LIM;
856 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
860 var.key = "picodrive_ramcart";
861 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
862 if (strcmp(var.value, "enabled") == 0)
863 PicoOpt |= POPT_EN_MCD_RAMCART;
865 PicoOpt &= ~POPT_EN_MCD_RAMCART;
870 var.key = "picodrive_drc";
871 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
872 if (strcmp(var.value, "enabled") == 0)
873 PicoOpt |= POPT_EN_DRC;
875 PicoOpt &= ~POPT_EN_DRC;
882 bool updated = false;
885 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
890 PicoPad[0] = PicoPad[1] = 0;
891 for (pad = 0; pad < 2; pad++)
892 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
893 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
894 PicoPad[pad] |= retro_pico_map[i];
898 video_cb((short *)vout_buf + vout_offset,
899 vout_width, vout_height, vout_width * 2);
902 static void check_system_specs(void)
904 /* TODO - set different performance level for 32X - 6 for ARM dynarec, higher for interpreter core */
906 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
909 void retro_init(void)
911 struct retro_log_callback log;
915 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
917 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
922 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
924 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
925 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
926 | POPT_EN_32X|POPT_EN_PWM
927 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
929 PicoOpt |= POPT_EN_DRC;
932 PicoAutoRgnOrder = 0x184; // US, EU, JP
936 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
939 PicoDrawSetOutFormat(PDF_RGB555, 0);
940 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
942 //PicoMessage = plat_status_msg_busy_next;
943 PicoMCDopenTray = disk_tray_open;
944 PicoMCDcloseTray = disk_tray_close;
949 void retro_deinit(void)