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1/*
2 * libretro core glue for PicoDrive
3 * (C) notaz, 2013
4 *
5 * This work is licensed under the terms of MAME license.
6 * See COPYING file in the top-level directory.
7 */
8
9#define _GNU_SOURCE 1 // mremap
10#include <stdio.h>
11#include <stdarg.h>
12#include <string.h>
13#ifndef _WIN32
14#include <sys/mman.h>
15#else
16#include <io.h>
17#include <windows.h>
18#include <sys/types.h>
19#endif
20#include <errno.h>
21#ifdef __MACH__
22#include <libkern/OSCacheControl.h>
23#endif
24
25#include <pico/pico_int.h>
26#include <pico/state.h>
27#include "common/input_pico.h"
28#include "common/version.h"
29#include "libretro.h"
30
31static retro_video_refresh_t video_cb;
32static retro_input_poll_t input_poll_cb;
33static retro_input_state_t input_state_cb;
34static retro_environment_t environ_cb;
35static retro_audio_sample_batch_t audio_batch_cb;
36
37static FILE *emu_log;
38
39#define VOUT_MAX_WIDTH 320
40#define VOUT_MAX_HEIGHT 240
41static void *vout_buf;
42static int vout_width, vout_height;
43
44static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
45
46static void snd_write(int len);
47
48#ifdef _WIN32
49#define SLASH '\\'
50#else
51#define SLASH '/'
52#endif
53
54/* functions called by the core */
55
56void cache_flush_d_inval_i(void *start, void *end)
57{
58#ifdef __arm__
59#if defined(__BLACKBERRY_QNX__)
60 msync(start, end - start, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
61#elif defined(__MACH__)
62 size_t len = (char *)end - (char *)start;
63 sys_dcache_flush(start, len);
64 sys_icache_invalidate(start, len);
65#else
66 __clear_cache(start, end);
67#endif
68#endif
69}
70
71#ifdef _WIN32
72/* mmap() replacement for Windows
73 *
74 * Author: Mike Frysinger <vapier@gentoo.org>
75 * Placed into the public domain
76 */
77
78/* References:
79 * CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx
80 * CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx
81 * MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx
82 * UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
83 */
84
85#define PROT_READ 0x1
86#define PROT_WRITE 0x2
87/* This flag is only available in WinXP+ */
88#ifdef FILE_MAP_EXECUTE
89#define PROT_EXEC 0x4
90#else
91#define PROT_EXEC 0x0
92#define FILE_MAP_EXECUTE 0
93#endif
94
95#define MAP_SHARED 0x01
96#define MAP_PRIVATE 0x02
97#define MAP_ANONYMOUS 0x20
98#define MAP_ANON MAP_ANONYMOUS
99#define MAP_FAILED ((void *) -1)
100
101#ifdef __USE_FILE_OFFSET64
102# define DWORD_HI(x) (x >> 32)
103# define DWORD_LO(x) ((x) & 0xffffffff)
104#else
105# define DWORD_HI(x) (0)
106# define DWORD_LO(x) (x)
107#endif
108
109static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
110{
111 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
112 return MAP_FAILED;
113 if (fd == -1) {
114 if (!(flags & MAP_ANON) || offset)
115 return MAP_FAILED;
116 } else if (flags & MAP_ANON)
117 return MAP_FAILED;
118
119 DWORD flProtect;
120 if (prot & PROT_WRITE) {
121 if (prot & PROT_EXEC)
122 flProtect = PAGE_EXECUTE_READWRITE;
123 else
124 flProtect = PAGE_READWRITE;
125 } else if (prot & PROT_EXEC) {
126 if (prot & PROT_READ)
127 flProtect = PAGE_EXECUTE_READ;
128 else if (prot & PROT_EXEC)
129 flProtect = PAGE_EXECUTE;
130 } else
131 flProtect = PAGE_READONLY;
132
133 off_t end = length + offset;
134 HANDLE mmap_fd, h;
135 if (fd == -1)
136 mmap_fd = INVALID_HANDLE_VALUE;
137 else
138 mmap_fd = (HANDLE)_get_osfhandle(fd);
139 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
140 if (h == NULL)
141 return MAP_FAILED;
142
143 DWORD dwDesiredAccess;
144 if (prot & PROT_WRITE)
145 dwDesiredAccess = FILE_MAP_WRITE;
146 else
147 dwDesiredAccess = FILE_MAP_READ;
148 if (prot & PROT_EXEC)
149 dwDesiredAccess |= FILE_MAP_EXECUTE;
150 if (flags & MAP_PRIVATE)
151 dwDesiredAccess |= FILE_MAP_COPY;
152 void *ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
153 if (ret == NULL) {
154 CloseHandle(h);
155 ret = MAP_FAILED;
156 }
157 return ret;
158}
159
160static void munmap(void *addr, size_t length)
161{
162 UnmapViewOfFile(addr);
163 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
164}
165#endif
166
167#ifndef MAP_ANONYMOUS
168#define MAP_ANONYMOUS MAP_ANON
169#endif
170
171void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
172{
173 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
174 void *req, *ret;
175
176 req = (void *)addr;
177 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
178 if (ret == MAP_FAILED) {
179 lprintf("mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
180 return NULL;
181 }
182
183 if (addr != 0 && ret != (void *)addr) {
184 lprintf("warning: wanted to map @%08lx, got %p\n",
185 addr, ret);
186
187 if (is_fixed) {
188 munmap(ret, size);
189 return NULL;
190 }
191 }
192
193 return ret;
194}
195
196void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
197{
198#ifdef __linux__
199 void *ret = mremap(ptr, oldsize, newsize, 0);
200 if (ret == MAP_FAILED)
201 return NULL;
202
203 return ret;
204#else
205 void *tmp, *ret;
206 size_t preserve_size;
207
208 preserve_size = oldsize;
209 if (preserve_size > newsize)
210 preserve_size = newsize;
211 tmp = malloc(preserve_size);
212 if (tmp == NULL)
213 return NULL;
214 memcpy(tmp, ptr, preserve_size);
215
216 munmap(ptr, oldsize);
217 ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
218 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
219 if (ret == MAP_FAILED) {
220 free(tmp);
221 return NULL;
222 }
223 memcpy(ret, tmp, preserve_size);
224 free(tmp);
225 return ret;
226#endif
227}
228
229void plat_munmap(void *ptr, size_t size)
230{
231 if (ptr != NULL)
232 munmap(ptr, size);
233}
234
235int plat_mem_set_exec(void *ptr, size_t size)
236{
237#ifdef _WIN32
238 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
239 if (ret == 0)
240 lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
241#else
242 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
243 if (ret != 0)
244 lprintf("mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
245#endif
246 return ret;
247}
248
249void emu_video_mode_change(int start_line, int line_count, int is_32cols)
250{
251 memset(vout_buf, 0, 320 * 240 * 2);
252 vout_width = is_32cols ? 256 : 320;
253 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
254}
255
256void emu_32x_startup(void)
257{
258}
259
260#ifndef ANDROID
261
262void lprintf(const char *fmt, ...)
263{
264 va_list list;
265
266 va_start(list, fmt);
267 fprintf(emu_log, "PicoDrive: ");
268 vfprintf(emu_log, fmt, list);
269 va_end(list);
270 fflush(emu_log);
271}
272
273#else
274
275#include <android/log.h>
276
277void lprintf(const char *fmt, ...)
278{
279 va_list list;
280
281 va_start(list, fmt);
282 __android_log_vprint(ANDROID_LOG_INFO, "PicoDrive", fmt, list);
283 va_end(list);
284}
285
286#endif
287
288/* libretro */
289void retro_set_environment(retro_environment_t cb)
290{
291 static const struct retro_variable vars[] = {
292 //{ "region", "Region; Auto|NTSC|PAL" },
293 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
294 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
295#ifdef DRC_SH2
296 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
297#endif
298 { NULL, NULL },
299 };
300
301 environ_cb = cb;
302
303 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
304}
305
306void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
307void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
308void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
309void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
310void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
311
312unsigned retro_api_version(void)
313{
314 return RETRO_API_VERSION;
315}
316
317void retro_set_controller_port_device(unsigned port, unsigned device)
318{
319}
320
321void retro_get_system_info(struct retro_system_info *info)
322{
323 memset(info, 0, sizeof(*info));
324 info->library_name = "PicoDrive";
325 info->library_version = VERSION;
326 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
327 info->need_fullpath = true;
328}
329
330void retro_get_system_av_info(struct retro_system_av_info *info)
331{
332 memset(info, 0, sizeof(*info));
333 info->timing.fps = Pico.m.pal ? 50 : 60;
334 info->timing.sample_rate = 44100;
335 info->geometry.base_width = 320;
336 info->geometry.base_height = 240;
337 info->geometry.max_width = VOUT_MAX_WIDTH;
338 info->geometry.max_height = VOUT_MAX_HEIGHT;
339 info->geometry.aspect_ratio = 4.0 / 3.0;
340}
341
342/* savestates */
343struct savestate_state {
344 const char *load_buf;
345 char *save_buf;
346 size_t size;
347 size_t pos;
348};
349
350size_t state_read(void *p, size_t size, size_t nmemb, void *file)
351{
352 struct savestate_state *state = file;
353 size_t bsize = size * nmemb;
354
355 if (state->pos + bsize > state->size) {
356 lprintf("savestate error: %u/%u\n",
357 state->pos + bsize, state->size);
358 bsize = state->size - state->pos;
359 if ((int)bsize <= 0)
360 return 0;
361 }
362
363 memcpy(p, state->load_buf + state->pos, bsize);
364 state->pos += bsize;
365 return bsize;
366}
367
368size_t state_write(void *p, size_t size, size_t nmemb, void *file)
369{
370 struct savestate_state *state = file;
371 size_t bsize = size * nmemb;
372
373 if (state->pos + bsize > state->size) {
374 lprintf("savestate error: %u/%u\n",
375 state->pos + bsize, state->size);
376 bsize = state->size - state->pos;
377 if ((int)bsize <= 0)
378 return 0;
379 }
380
381 memcpy(state->save_buf + state->pos, p, bsize);
382 state->pos += bsize;
383 return bsize;
384}
385
386size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
387{
388 struct savestate_state *state = file;
389 size_t bsize = size * nmemb;
390
391 state->pos += bsize;
392 return bsize;
393}
394
395size_t state_eof(void *file)
396{
397 struct savestate_state *state = file;
398
399 return state->pos >= state->size;
400}
401
402int state_fseek(void *file, long offset, int whence)
403{
404 struct savestate_state *state = file;
405
406 switch (whence) {
407 case SEEK_SET:
408 state->pos = offset;
409 break;
410 case SEEK_CUR:
411 state->pos += offset;
412 break;
413 case SEEK_END:
414 state->pos = state->size + offset;
415 break;
416 }
417 return (int)state->pos;
418}
419
420/* savestate sizes vary wildly depending if cd/32x or
421 * carthw is active, so run the whole thing to get size */
422size_t retro_serialize_size(void)
423{
424 struct savestate_state state = { 0, };
425 int ret;
426
427 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
428 if (ret != 0)
429 return 0;
430
431 return state.pos;
432}
433
434bool retro_serialize(void *data, size_t size)
435{
436 struct savestate_state state = { 0, };
437 int ret;
438
439 state.save_buf = data;
440 state.size = size;
441 state.pos = 0;
442
443 ret = PicoStateFP(&state, 1, NULL, state_write,
444 NULL, state_fseek);
445 return ret == 0;
446}
447
448bool retro_unserialize(const void *data, size_t size)
449{
450 struct savestate_state state = { 0, };
451 int ret;
452
453 state.load_buf = data;
454 state.size = size;
455 state.pos = 0;
456
457 ret = PicoStateFP(&state, 0, state_read, NULL,
458 state_eof, state_fseek);
459 return ret == 0;
460}
461
462/* cheats - TODO */
463void retro_cheat_reset(void)
464{
465}
466
467void retro_cheat_set(unsigned index, bool enabled, const char *code)
468{
469}
470
471/* multidisk support */
472static bool disk_ejected;
473static unsigned int disk_current_index;
474static unsigned int disk_count;
475static struct disks_state {
476 char *fname;
477} disks[8];
478
479static bool disk_set_eject_state(bool ejected)
480{
481 // TODO?
482 disk_ejected = ejected;
483 return true;
484}
485
486static bool disk_get_eject_state(void)
487{
488 return disk_ejected;
489}
490
491static unsigned int disk_get_image_index(void)
492{
493 return disk_current_index;
494}
495
496static bool disk_set_image_index(unsigned int index)
497{
498 cd_img_type cd_type;
499 int ret;
500
501 if (index >= sizeof(disks) / sizeof(disks[0]))
502 return false;
503
504 if (disks[index].fname == NULL) {
505 lprintf("missing disk #%u\n", index);
506
507 // RetroArch specifies "no disk" with index == count,
508 // so don't fail here..
509 disk_current_index = index;
510 return true;
511 }
512
513 lprintf("switching to disk %u: \"%s\"\n", index,
514 disks[index].fname);
515
516 ret = -1;
517 cd_type = PicoCdCheck(disks[index].fname, NULL);
518 if (cd_type != CIT_NOT_CD)
519 ret = Insert_CD(disks[index].fname, cd_type);
520 if (ret != 0) {
521 lprintf("Load failed, invalid CD image?\n");
522 return 0;
523 }
524
525 disk_current_index = index;
526 return true;
527}
528
529static unsigned int disk_get_num_images(void)
530{
531 return disk_count;
532}
533
534static bool disk_replace_image_index(unsigned index,
535 const struct retro_game_info *info)
536{
537 bool ret = true;
538
539 if (index >= sizeof(disks) / sizeof(disks[0]))
540 return false;
541
542 if (disks[index].fname != NULL)
543 free(disks[index].fname);
544 disks[index].fname = NULL;
545
546 if (info != NULL) {
547 disks[index].fname = strdup(info->path);
548 if (index == disk_current_index)
549 ret = disk_set_image_index(index);
550 }
551
552 return ret;
553}
554
555static bool disk_add_image_index(void)
556{
557 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
558 return false;
559
560 disk_count++;
561 return true;
562}
563
564static struct retro_disk_control_callback disk_control = {
565 .set_eject_state = disk_set_eject_state,
566 .get_eject_state = disk_get_eject_state,
567 .get_image_index = disk_get_image_index,
568 .set_image_index = disk_set_image_index,
569 .get_num_images = disk_get_num_images,
570 .replace_image_index = disk_replace_image_index,
571 .add_image_index = disk_add_image_index,
572};
573
574static void disk_tray_open(void)
575{
576 lprintf("cd tray open\n");
577 disk_ejected = 1;
578}
579
580static void disk_tray_close(void)
581{
582 lprintf("cd tray close\n");
583 disk_ejected = 0;
584}
585
586
587static const char * const biosfiles_us[] = {
588 "us_scd1_9210", "us_scd2_9306", "SegaCDBIOS9303", "bios_CD_U"
589};
590static const char * const biosfiles_eu[] = {
591 "eu_mcd1_9210", "eu_mcd2_9306", "eu_mcd2_9303", "bios_CD_E"
592};
593static const char * const biosfiles_jp[] = {
594 "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
595};
596
597static void make_system_path(char *buf, size_t buf_size,
598 const char *name, const char *ext)
599{
600 const char *dir = NULL;
601
602 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
603 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
604 }
605 else {
606 snprintf(buf, buf_size, "%s%s", name, ext);
607 }
608}
609
610static const char *find_bios(int *region, const char *cd_fname)
611{
612 const char * const *files;
613 static char path[256];
614 int i, count;
615 FILE *f = NULL;
616
617 if (*region == 4) { // US
618 files = biosfiles_us;
619 count = sizeof(biosfiles_us) / sizeof(char *);
620 } else if (*region == 8) { // EU
621 files = biosfiles_eu;
622 count = sizeof(biosfiles_eu) / sizeof(char *);
623 } else if (*region == 1 || *region == 2) {
624 files = biosfiles_jp;
625 count = sizeof(biosfiles_jp) / sizeof(char *);
626 } else {
627 return NULL;
628 }
629
630 for (i = 0; i < count; i++)
631 {
632 make_system_path(path, sizeof(path), files[i], ".bin");
633 f = fopen(path, "rb");
634 if (f != NULL)
635 break;
636
637 make_system_path(path, sizeof(path), files[i], ".zip");
638 f = fopen(path, "rb");
639 if (f != NULL)
640 break;
641 }
642
643 if (f != NULL) {
644 lprintf("using bios: %s\n", path);
645 fclose(f);
646 return path;
647 }
648
649 return NULL;
650}
651
652bool retro_load_game(const struct retro_game_info *info)
653{
654 enum media_type_e media_type;
655 static char carthw_path[256];
656 size_t i;
657
658 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
659 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
660 lprintf("RGB565 support required, sorry\n");
661 return false;
662 }
663
664 if (info == NULL || info->path == NULL) {
665 lprintf("info->path required\n");
666 return false;
667 }
668
669 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
670 if (disks[i].fname != NULL) {
671 free(disks[i].fname);
672 disks[i].fname = NULL;
673 }
674 }
675
676 disk_current_index = 0;
677 disk_count = 1;
678 disks[0].fname = strdup(info->path);
679
680 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
681
682 media_type = PicoLoadMedia(info->path, carthw_path,
683 find_bios, NULL);
684
685 switch (media_type) {
686 case PM_BAD_DETECT:
687 lprintf("Failed to detect ROM/CD image type.\n");
688 return false;
689 case PM_BAD_CD:
690 lprintf("Invalid CD image\n");
691 return false;
692 case PM_BAD_CD_NO_BIOS:
693 lprintf("Missing BIOS\n");
694 return false;
695 case PM_ERROR:
696 lprintf("Load error\n");
697 return false;
698 default:
699 break;
700 }
701
702 PicoLoopPrepare();
703
704 PicoWriteSound = snd_write;
705 memset(sndBuffer, 0, sizeof(sndBuffer));
706 PsndOut = sndBuffer;
707 PsndRerate(1);
708
709 return true;
710}
711
712bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
713{
714 return false;
715}
716
717void retro_unload_game(void)
718{
719}
720
721unsigned retro_get_region(void)
722{
723 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
724}
725
726void *retro_get_memory_data(unsigned id)
727{
728 if (id != RETRO_MEMORY_SAVE_RAM)
729 return NULL;
730
731 if (PicoAHW & PAHW_MCD)
732 return Pico_mcd->bram;
733 else
734 return SRam.data;
735}
736
737size_t retro_get_memory_size(unsigned id)
738{
739 if (id != RETRO_MEMORY_SAVE_RAM)
740 return 0;
741
742 if (PicoAHW & PAHW_MCD)
743 // bram
744 return 0x2000;
745 else
746 return SRam.size;
747}
748
749void retro_reset(void)
750{
751 PicoReset();
752}
753
754static const unsigned short retro_pico_map[] = {
755 [RETRO_DEVICE_ID_JOYPAD_B] = 1 << GBTN_B,
756 [RETRO_DEVICE_ID_JOYPAD_Y] = 1 << GBTN_A,
757 [RETRO_DEVICE_ID_JOYPAD_SELECT] = 1 << GBTN_MODE,
758 [RETRO_DEVICE_ID_JOYPAD_START] = 1 << GBTN_START,
759 [RETRO_DEVICE_ID_JOYPAD_UP] = 1 << GBTN_UP,
760 [RETRO_DEVICE_ID_JOYPAD_DOWN] = 1 << GBTN_DOWN,
761 [RETRO_DEVICE_ID_JOYPAD_LEFT] = 1 << GBTN_LEFT,
762 [RETRO_DEVICE_ID_JOYPAD_RIGHT] = 1 << GBTN_RIGHT,
763 [RETRO_DEVICE_ID_JOYPAD_A] = 1 << GBTN_C,
764 [RETRO_DEVICE_ID_JOYPAD_X] = 1 << GBTN_Y,
765 [RETRO_DEVICE_ID_JOYPAD_L] = 1 << GBTN_X,
766 [RETRO_DEVICE_ID_JOYPAD_R] = 1 << GBTN_Z,
767};
768#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
769
770static void snd_write(int len)
771{
772 audio_batch_cb(PsndOut, len / 4);
773}
774
775static enum input_device input_name_to_val(const char *name)
776{
777 if (strcmp(name, "3 button pad") == 0)
778 return PICO_INPUT_PAD_3BTN;
779 if (strcmp(name, "6 button pad") == 0)
780 return PICO_INPUT_PAD_6BTN;
781 if (strcmp(name, "None") == 0)
782 return PICO_INPUT_NOTHING;
783
784 lprintf("invalid picodrive_input: '%s'\n", name);
785 return PICO_INPUT_PAD_3BTN;
786}
787
788static void update_variables(void)
789{
790 struct retro_variable var;
791
792 var.value = NULL;
793 var.key = "picodrive_input1";
794 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
795 PicoSetInputDevice(0, input_name_to_val(var.value));
796
797 var.value = NULL;
798 var.key = "picodrive_input2";
799 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
800 PicoSetInputDevice(1, input_name_to_val(var.value));
801
802#ifdef DRC_SH2
803 var.value = NULL;
804 var.key = "picodrive_drc";
805 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
806 if (strcmp(var.value, "enabled") == 0)
807 PicoOpt |= POPT_EN_DRC;
808 else
809 PicoOpt &= ~POPT_EN_DRC;
810 }
811#endif
812}
813
814void retro_run(void)
815{
816 bool updated = false;
817 int pad, i;
818
819 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
820 update_variables();
821
822 input_poll_cb();
823
824 PicoPad[0] = PicoPad[1] = 0;
825 for (pad = 0; pad < 2; pad++)
826 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
827 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
828 PicoPad[pad] |= retro_pico_map[i];
829
830 PicoFrame();
831
832 video_cb(vout_buf, vout_width, vout_height, vout_width * 2);
833}
834
835void retro_init(void)
836{
837 int level;
838
839#ifdef IOS
840 emu_log = fopen("/User/Documents/PicoDrive.log", "w");
841 if (emu_log == NULL)
842 emu_log = fopen("PicoDrive.log", "w");
843 if (emu_log == NULL)
844#endif
845 emu_log = stdout;
846
847 level = 0;
848 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
849
850 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
851
852 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
853 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
854 | POPT_EN_32X|POPT_EN_PWM
855 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
856#ifdef __arm__
857 PicoOpt |= POPT_EN_DRC;
858#endif
859 PsndRate = 44100;
860 PicoAutoRgnOrder = 0x184; // US, EU, JP
861 PicoCDBuffers = 0;
862
863 vout_width = 320;
864 vout_height = 240;
865 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
866
867 PicoInit();
868 PicoDrawSetOutFormat(PDF_RGB555, 0);
869 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
870
871 //PicoMessage = plat_status_msg_busy_next;
872 PicoMCDopenTray = disk_tray_open;
873 PicoMCDcloseTray = disk_tray_close;
874
875 update_variables();
876}
877
878void retro_deinit(void)
879{
880 PicoExit();
881}
fast MegaDrive/MegaCD/32X emulator