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.
13 #define _GNU_SOURCE 1 // mremap
24 #include <sys/types.h>
28 #include <libkern/OSCacheControl.h>
31 #include <pico/pico_int.h>
32 #include <pico/state.h>
33 #include "common/input_pico.h"
34 #include "common/version.h"
37 static retro_log_printf_t log_cb;
38 static retro_video_refresh_t video_cb;
39 static retro_input_poll_t input_poll_cb;
40 static retro_input_state_t input_state_cb;
41 static retro_environment_t environ_cb;
42 static retro_audio_sample_batch_t audio_batch_cb;
44 #define VOUT_MAX_WIDTH 320
45 #define VOUT_MAX_HEIGHT 240
46 static void *vout_buf;
47 static int vout_width, vout_height, vout_offset;
49 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 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
119 if (!(flags & MAP_ANON) || offset)
121 } else if (flags & MAP_ANON)
125 if (prot & PROT_WRITE) {
126 if (prot & PROT_EXEC)
127 flProtect = PAGE_EXECUTE_READWRITE;
129 flProtect = PAGE_READWRITE;
130 } else if (prot & PROT_EXEC) {
131 if (prot & PROT_READ)
132 flProtect = PAGE_EXECUTE_READ;
133 else if (prot & PROT_EXEC)
134 flProtect = PAGE_EXECUTE;
136 flProtect = PAGE_READONLY;
138 off_t end = length + offset;
141 mmap_fd = INVALID_HANDLE_VALUE;
143 mmap_fd = (HANDLE)_get_osfhandle(fd);
144 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
148 DWORD dwDesiredAccess;
149 if (prot & PROT_WRITE)
150 dwDesiredAccess = FILE_MAP_WRITE;
152 dwDesiredAccess = FILE_MAP_READ;
153 if (prot & PROT_EXEC)
154 dwDesiredAccess |= FILE_MAP_EXECUTE;
155 if (flags & MAP_PRIVATE)
156 dwDesiredAccess |= FILE_MAP_COPY;
157 void *ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
165 static void munmap(void *addr, size_t length)
167 UnmapViewOfFile(addr);
168 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
170 #elif defined(NO_MMAP)
171 #define PROT_EXEC 0x04
175 #define MAP_PRIVATE 0
176 #define MAP_ANONYMOUS 0
178 void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off)
183 void munmap(void *base_addr, size_t len)
188 int mprotect(void *addr, size_t len, int prot)
190 /* stub - not really needed at this point since this codepath has no dynarecs */
196 #ifndef MAP_ANONYMOUS
197 #define MAP_ANONYMOUS MAP_ANON
200 void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
202 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
206 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
207 if (ret == MAP_FAILED) {
209 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
213 if (addr != 0 && ret != (void *)addr) {
215 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
227 void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
230 void *ret = mremap(ptr, oldsize, newsize, 0);
231 if (ret == MAP_FAILED)
237 size_t preserve_size;
239 preserve_size = oldsize;
240 if (preserve_size > newsize)
241 preserve_size = newsize;
242 tmp = malloc(preserve_size);
245 memcpy(tmp, ptr, preserve_size);
247 munmap(ptr, oldsize);
248 ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
249 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
250 if (ret == MAP_FAILED) {
254 memcpy(ret, tmp, preserve_size);
260 void plat_munmap(void *ptr, size_t size)
266 int plat_mem_set_exec(void *ptr, size_t size)
269 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
270 if (ret == 0 && log_cb)
271 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
273 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
274 if (ret != 0 && log_cb)
275 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
280 void emu_video_mode_change(int start_line, int line_count, int is_32cols)
282 memset(vout_buf, 0, 320 * 240 * 2);
283 vout_width = is_32cols ? 256 : 320;
284 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
286 vout_height = line_count;
287 vout_offset = vout_width * start_line;
290 void emu_32x_startup(void)
294 void lprintf(const char *fmt, ...)
299 vsprintf(buffer, fmt, ap);
300 /* TODO - add 'level' param for warning/error messages? */
302 log_cb(RETRO_LOG_INFO, "%s\n", fmt);
306 void retro_set_environment(retro_environment_t cb)
308 static const struct retro_variable vars[] = {
309 //{ "region", "Region; Auto|NTSC|PAL" },
310 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
311 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
312 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
313 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
315 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
322 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
325 void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
326 void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
327 void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
328 void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
329 void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
331 unsigned retro_api_version(void)
333 return RETRO_API_VERSION;
336 void retro_set_controller_port_device(unsigned port, unsigned device)
340 void retro_get_system_info(struct retro_system_info *info)
342 memset(info, 0, sizeof(*info));
343 info->library_name = "PicoDrive";
344 info->library_version = VERSION;
345 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
346 info->need_fullpath = true;
349 void retro_get_system_av_info(struct retro_system_av_info *info)
351 memset(info, 0, sizeof(*info));
352 info->timing.fps = Pico.m.pal ? 50 : 60;
353 info->timing.sample_rate = 44100;
354 info->geometry.base_width = 320;
355 info->geometry.base_height = vout_height;
356 info->geometry.max_width = VOUT_MAX_WIDTH;
357 info->geometry.max_height = VOUT_MAX_HEIGHT;
358 info->geometry.aspect_ratio = 0.0f;
362 struct savestate_state {
363 const char *load_buf;
369 size_t state_read(void *p, size_t size, size_t nmemb, void *file)
371 struct savestate_state *state = file;
372 size_t bsize = size * nmemb;
374 if (state->pos + bsize > state->size) {
376 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
377 state->pos + bsize, state->size);
378 bsize = state->size - state->pos;
383 memcpy(p, state->load_buf + state->pos, bsize);
388 size_t state_write(void *p, size_t size, size_t nmemb, void *file)
390 struct savestate_state *state = file;
391 size_t bsize = size * nmemb;
393 if (state->pos + bsize > state->size) {
395 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
396 state->pos + bsize, state->size);
397 bsize = state->size - state->pos;
402 memcpy(state->save_buf + state->pos, p, bsize);
407 size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
409 struct savestate_state *state = file;
410 size_t bsize = size * nmemb;
416 size_t state_eof(void *file)
418 struct savestate_state *state = file;
420 return state->pos >= state->size;
423 int state_fseek(void *file, long offset, int whence)
425 struct savestate_state *state = file;
432 state->pos += offset;
435 state->pos = state->size + offset;
438 return (int)state->pos;
441 /* savestate sizes vary wildly depending if cd/32x or
442 * carthw is active, so run the whole thing to get size */
443 size_t retro_serialize_size(void)
445 struct savestate_state state = { 0, };
448 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
455 bool retro_serialize(void *data, size_t size)
457 struct savestate_state state = { 0, };
460 state.save_buf = data;
464 ret = PicoStateFP(&state, 1, NULL, state_write,
469 bool retro_unserialize(const void *data, size_t size)
471 struct savestate_state state = { 0, };
474 state.load_buf = data;
478 ret = PicoStateFP(&state, 0, state_read, NULL,
479 state_eof, state_fseek);
484 void retro_cheat_reset(void)
488 void retro_cheat_set(unsigned index, bool enabled, const char *code)
492 /* multidisk support */
493 static bool disk_ejected;
494 static unsigned int disk_current_index;
495 static unsigned int disk_count;
496 static struct disks_state {
500 static bool disk_set_eject_state(bool ejected)
503 disk_ejected = ejected;
507 static bool disk_get_eject_state(void)
512 static unsigned int disk_get_image_index(void)
514 return disk_current_index;
517 static bool disk_set_image_index(unsigned int index)
519 enum cd_img_type cd_type;
522 if (index >= sizeof(disks) / sizeof(disks[0]))
525 if (disks[index].fname == NULL) {
527 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
529 // RetroArch specifies "no disk" with index == count,
530 // so don't fail here..
531 disk_current_index = index;
536 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
540 cd_type = PicoCdCheck(disks[index].fname, NULL);
541 if (cd_type != CIT_NOT_CD)
542 ret = cdd_load(disks[index].fname, cd_type);
545 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
549 disk_current_index = index;
553 static unsigned int disk_get_num_images(void)
558 static bool disk_replace_image_index(unsigned index,
559 const struct retro_game_info *info)
563 if (index >= sizeof(disks) / sizeof(disks[0]))
566 if (disks[index].fname != NULL)
567 free(disks[index].fname);
568 disks[index].fname = NULL;
571 disks[index].fname = strdup(info->path);
572 if (index == disk_current_index)
573 ret = disk_set_image_index(index);
579 static bool disk_add_image_index(void)
581 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
588 static struct retro_disk_control_callback disk_control = {
589 .set_eject_state = disk_set_eject_state,
590 .get_eject_state = disk_get_eject_state,
591 .get_image_index = disk_get_image_index,
592 .set_image_index = disk_set_image_index,
593 .get_num_images = disk_get_num_images,
594 .replace_image_index = disk_replace_image_index,
595 .add_image_index = disk_add_image_index,
598 static void disk_tray_open(void)
601 log_cb(RETRO_LOG_INFO, "cd tray open\n");
605 static void disk_tray_close(void)
608 log_cb(RETRO_LOG_INFO, "cd tray close\n");
613 static const char * const biosfiles_us[] = {
614 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
616 static const char * const biosfiles_eu[] = {
617 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
619 static const char * const biosfiles_jp[] = {
620 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
623 static void make_system_path(char *buf, size_t buf_size,
624 const char *name, const char *ext)
626 const char *dir = NULL;
628 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
629 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
632 snprintf(buf, buf_size, "%s%s", name, ext);
636 static const char *find_bios(int *region, const char *cd_fname)
638 const char * const *files;
639 static char path[256];
643 if (*region == 4) { // US
644 files = biosfiles_us;
645 count = sizeof(biosfiles_us) / sizeof(char *);
646 } else if (*region == 8) { // EU
647 files = biosfiles_eu;
648 count = sizeof(biosfiles_eu) / sizeof(char *);
649 } else if (*region == 1 || *region == 2) {
650 files = biosfiles_jp;
651 count = sizeof(biosfiles_jp) / sizeof(char *);
656 for (i = 0; i < count; i++)
658 make_system_path(path, sizeof(path), files[i], ".bin");
659 f = fopen(path, "rb");
663 make_system_path(path, sizeof(path), files[i], ".zip");
664 f = fopen(path, "rb");
671 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
679 bool retro_load_game(const struct retro_game_info *info)
681 enum media_type_e media_type;
682 static char carthw_path[256];
685 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
686 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
688 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
692 if (info == NULL || info->path == NULL) {
694 log_cb(RETRO_LOG_ERROR, "info->path required\n");
698 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
699 if (disks[i].fname != NULL) {
700 free(disks[i].fname);
701 disks[i].fname = NULL;
705 disk_current_index = 0;
707 disks[0].fname = strdup(info->path);
709 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
711 media_type = PicoLoadMedia(info->path, carthw_path,
714 switch (media_type) {
717 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
721 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
723 case PM_BAD_CD_NO_BIOS:
725 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
729 log_cb(RETRO_LOG_ERROR, "Load error\n");
737 PicoWriteSound = snd_write;
738 memset(sndBuffer, 0, sizeof(sndBuffer));
745 bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
750 void retro_unload_game(void)
754 unsigned retro_get_region(void)
756 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
759 void *retro_get_memory_data(unsigned id)
761 if (id != RETRO_MEMORY_SAVE_RAM)
764 if (PicoAHW & PAHW_MCD)
765 return Pico_mcd->bram;
770 size_t retro_get_memory_size(unsigned id)
775 if (id != RETRO_MEMORY_SAVE_RAM)
778 if (PicoAHW & PAHW_MCD)
782 if (Pico.m.frame_count == 0)
785 // if game doesn't write to sram, don't report it to
786 // libretro so that RA doesn't write out zeroed .srm
787 for (i = 0, sum = 0; i < SRam.size; i++)
790 return (sum != 0) ? SRam.size : 0;
793 void retro_reset(void)
798 static const unsigned short retro_pico_map[] = {
799 [RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
800 [RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
801 [RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
802 [RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
803 [RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
804 [RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
805 [RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
806 [RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
807 [RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
808 [RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
809 [RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
810 [RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
812 #define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
814 static void snd_write(int len)
816 audio_batch_cb(PsndOut, len / 4);
819 static enum input_device input_name_to_val(const char *name)
821 if (strcmp(name, "3 button pad") == 0)
822 return PICO_INPUT_PAD_3BTN;
823 if (strcmp(name, "6 button pad") == 0)
824 return PICO_INPUT_PAD_6BTN;
825 if (strcmp(name, "None") == 0)
826 return PICO_INPUT_NOTHING;
829 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
830 return PICO_INPUT_PAD_3BTN;
833 static void update_variables(void)
835 struct retro_variable var;
838 var.key = "picodrive_input1";
839 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
840 PicoSetInputDevice(0, input_name_to_val(var.value));
843 var.key = "picodrive_input2";
844 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
845 PicoSetInputDevice(1, input_name_to_val(var.value));
848 var.key = "picodrive_sprlim";
849 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
850 if (strcmp(var.value, "enabled") == 0)
851 PicoOpt |= POPT_DIS_SPRITE_LIM;
853 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
857 var.key = "picodrive_ramcart";
858 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
859 if (strcmp(var.value, "enabled") == 0)
860 PicoOpt |= POPT_EN_MCD_RAMCART;
862 PicoOpt &= ~POPT_EN_MCD_RAMCART;
867 var.key = "picodrive_drc";
868 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
869 if (strcmp(var.value, "enabled") == 0)
870 PicoOpt |= POPT_EN_DRC;
872 PicoOpt &= ~POPT_EN_DRC;
879 bool updated = false;
882 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
887 PicoPad[0] = PicoPad[1] = 0;
888 for (pad = 0; pad < 2; pad++)
889 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
890 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
891 PicoPad[pad] |= retro_pico_map[i];
895 video_cb((short *)vout_buf + vout_offset,
896 vout_width, vout_height, vout_width * 2);
899 void retro_init(void)
901 struct retro_log_callback log;
905 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
907 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
912 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
914 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
915 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
916 | POPT_EN_32X|POPT_EN_PWM
917 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
919 PicoOpt |= POPT_EN_DRC;
922 PicoAutoRgnOrder = 0x184; // US, EU, JP
926 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
929 PicoDrawSetOutFormat(PDF_RGB555, 0);
930 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
932 //PicoMessage = plat_status_msg_busy_next;
933 PicoMCDopenTray = disk_tray_open;
934 PicoMCDcloseTray = disk_tray_close;
939 void retro_deinit(void)