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(Libretro) Fixup logging
[picodrive.git] / platform / libretro.c
CommitLineData
2446536b 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>
e8b61936 13#ifndef _WIN32
2446536b 14#include <sys/mman.h>
e8b61936 15#else
6f1133bc 16#include <io.h>
e8b61936 17#include <windows.h>
6f1133bc 18#include <sys/types.h>
e8b61936 19#endif
c25d78ee 20#include <errno.h>
2446536b 21#ifdef __MACH__
22#include <libkern/OSCacheControl.h>
23#endif
24
25#include <pico/pico_int.h>
86b38dc4 26#include <pico/state.h>
2446536b 27#include "common/input_pico.h"
28#include "common/version.h"
29#include "libretro.h"
30
f5d4045b 31static retro_log_printf_t log_cb;
2446536b 32static retro_video_refresh_t video_cb;
33static retro_input_poll_t input_poll_cb;
34static retro_input_state_t input_state_cb;
35static retro_environment_t environ_cb;
36static retro_audio_sample_batch_t audio_batch_cb;
37
2446536b 38#define VOUT_MAX_WIDTH 320
39#define VOUT_MAX_HEIGHT 240
40static void *vout_buf;
51c08950 41static int vout_width, vout_height, vout_offset;
2446536b 42
43static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
44
2446536b 45static void snd_write(int len);
46
47#ifdef _WIN32
48#define SLASH '\\'
49#else
50#define SLASH '/'
51#endif
52
53/* functions called by the core */
54
55void cache_flush_d_inval_i(void *start, void *end)
56{
57#ifdef __arm__
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);
64#else
65 __clear_cache(start, end);
66#endif
67#endif
68}
69
e8b61936 70#ifdef _WIN32
6f1133bc
T		 71/* mmap() replacement for Windows
72 *
73 * Author: Mike Frysinger <vapier@gentoo.org>
74 * Placed into the public domain
75 */
76
77/* References:
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
82 */
83
84#define PROT_READ 0x1
85#define PROT_WRITE 0x2
86/* This flag is only available in WinXP+ */
87#ifdef FILE_MAP_EXECUTE
88#define PROT_EXEC 0x4
89#else
90#define PROT_EXEC 0x0
91#define FILE_MAP_EXECUTE 0
92#endif
93
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)
99
100#ifdef __USE_FILE_OFFSET64
101# define DWORD_HI(x) (x >> 32)
102# define DWORD_LO(x) ((x) & 0xffffffff)
103#else
104# define DWORD_HI(x) (0)
105# define DWORD_LO(x) (x)
106#endif
107
108static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
2446536b 109{
6f1133bc
T		 110 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
111 return MAP_FAILED;
112 if (fd == -1) {
113 if (!(flags & MAP_ANON) || offset)
114 return MAP_FAILED;
115 } else if (flags & MAP_ANON)
116 return MAP_FAILED;
117
118 DWORD flProtect;
119 if (prot & PROT_WRITE) {
120 if (prot & PROT_EXEC)
121 flProtect = PAGE_EXECUTE_READWRITE;
122 else
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;
129 } else
130 flProtect = PAGE_READONLY;
131
132 off_t end = length + offset;
133 HANDLE mmap_fd, h;
134 if (fd == -1)
135 mmap_fd = INVALID_HANDLE_VALUE;
136 else
137 mmap_fd = (HANDLE)_get_osfhandle(fd);
138 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
139 if (h == NULL)
140 return MAP_FAILED;
141
142 DWORD dwDesiredAccess;
143 if (prot & PROT_WRITE)
144 dwDesiredAccess = FILE_MAP_WRITE;
145 else
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);
152 if (ret == NULL) {
153 CloseHandle(h);
154 ret = MAP_FAILED;
155 }
156 return ret;
e8b61936 157}
2446536b 158
6f1133bc 159static void munmap(void *addr, size_t length)
e8b61936 160{
6f1133bc
T		 161 UnmapViewOfFile(addr);
162 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
e8b61936 163}
e8b61936 164#endif
8e5639bc 165
166#ifndef MAP_ANONYMOUS
167#define MAP_ANONYMOUS MAP_ANON
168#endif
169
e8b61936 170void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
171{
e8b61936 172 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
173 void *req, *ret;
174
175 req = (void *)addr;
176 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
177 if (ret == MAP_FAILED) {
f5d4045b 178 if (log_cb)
179 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
e8b61936 180 return NULL;
181 }
182
183 if (addr != 0 && ret != (void *)addr) {
f5d4045b 184 if (log_cb)
185 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
186 addr, ret);
e8b61936 187
188 if (is_fixed) {
189 munmap(ret, size);
190 return NULL;
191 }
192 }
2446536b 193
194 return ret;
195}
196
197void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
198{
8c8b7284 199#ifdef __linux__
2446536b 200 void *ret = mremap(ptr, oldsize, newsize, 0);
201 if (ret == MAP_FAILED)
202 return NULL;
203
204 return ret;
8c8b7284 205#else
206 void *tmp, *ret;
207 size_t preserve_size;
208
209 preserve_size = oldsize;
210 if (preserve_size > newsize)
211 preserve_size = newsize;
212 tmp = malloc(preserve_size);
213 if (tmp == NULL)
214 return NULL;
215 memcpy(tmp, ptr, preserve_size);
216
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) {
221 free(tmp);
222 return NULL;
223 }
224 memcpy(ret, tmp, preserve_size);
225 free(tmp);
226 return ret;
227#endif
2446536b 228}
229
230void plat_munmap(void *ptr, size_t size)
231{
232 if (ptr != NULL)
233 munmap(ptr, size);
234}
235
c25d78ee 236int plat_mem_set_exec(void *ptr, size_t size)
237{
e8b61936 238#ifdef _WIN32
239 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
f5d4045b 240 if (ret == 0 && log_cb)
241 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
e8b61936 242#else
243 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
f5d4045b 244 if (ret != 0 && log_cb)
245 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
e8b61936 246#endif
c25d78ee 247 return ret;
248}
249
2446536b 250void emu_video_mode_change(int start_line, int line_count, int is_32cols)
251{
252 memset(vout_buf, 0, 320 * 240 * 2);
253 vout_width = is_32cols ? 256 : 320;
254 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
51c08950 255
256 vout_height = line_count;
257 vout_offset = vout_width * start_line;
2446536b 258}
259
260void emu_32x_startup(void)
261{
2446536b 262}
263
2446536b 264void lprintf(const char *fmt, ...)
265{
c681e48d 266 char buffer[256];
267 va_list ap;
268 va_start(ap, fmt);
269 vsprintf(buffer, fmt, ap);
f5d4045b 270 /* TODO - add 'level' param for warning/error messages? */
271 if (log_cb)
c681e48d 272 log_cb(RETRO_LOG_INFO, "%s\n", fmt);
2446536b 273}
274
2446536b 275/* libretro */
276void retro_set_environment(retro_environment_t cb)
277{
278 static const struct retro_variable vars[] = {
279 //{ "region", "Region; Auto|NTSC|PAL" },
531a8f38 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" },
27f190ea 282 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
283 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
0185b677 284#ifdef DRC_SH2
285 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
286#endif
2446536b 287 { NULL, NULL },
288 };
289
290 environ_cb = cb;
291
292 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
293}
294
295void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
296void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
297void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
298void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
299void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
300
301unsigned retro_api_version(void)
302{
303 return RETRO_API_VERSION;
304}
305
306void retro_set_controller_port_device(unsigned port, unsigned device)
307{
308}
309
310void retro_get_system_info(struct retro_system_info *info)
311{
312 memset(info, 0, sizeof(*info));
313 info->library_name = "PicoDrive";
314 info->library_version = VERSION;
53b2e51c 315 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
2446536b 316 info->need_fullpath = true;
317}
318
319void retro_get_system_av_info(struct retro_system_av_info *info)
320{
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;
51c08950 325 info->geometry.base_height = vout_height;
2446536b 326 info->geometry.max_width = VOUT_MAX_WIDTH;
327 info->geometry.max_height = VOUT_MAX_HEIGHT;
51c08950 328 info->geometry.aspect_ratio = 0.0f;
2446536b 329}
330
86b38dc4 331/* savestates */
332struct savestate_state {
333 const char *load_buf;
334 char *save_buf;
335 size_t size;
336 size_t pos;
337};
338
339size_t state_read(void *p, size_t size, size_t nmemb, void *file)
340{
341 struct savestate_state *state = file;
342 size_t bsize = size * nmemb;
343
344 if (state->pos + bsize > state->size) {
f5d4045b 345 if (log_cb)
346 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
347 state->pos + bsize, state->size);
86b38dc4 348 bsize = state->size - state->pos;
349 if ((int)bsize <= 0)
350 return 0;
351 }
352
353 memcpy(p, state->load_buf + state->pos, bsize);
354 state->pos += bsize;
355 return bsize;
356}
357
358size_t state_write(void *p, size_t size, size_t nmemb, void *file)
359{
360 struct savestate_state *state = file;
361 size_t bsize = size * nmemb;
362
363 if (state->pos + bsize > state->size) {
f5d4045b 364 if (log_cb)
365 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
366 state->pos + bsize, state->size);
86b38dc4 367 bsize = state->size - state->pos;
368 if ((int)bsize <= 0)
369 return 0;
370 }
371
372 memcpy(state->save_buf + state->pos, p, bsize);
373 state->pos += bsize;
374 return bsize;
375}
376
377size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
378{
379 struct savestate_state *state = file;
380 size_t bsize = size * nmemb;
381
382 state->pos += bsize;
383 return bsize;
384}
385
386size_t state_eof(void *file)
387{
388 struct savestate_state *state = file;
389
390 return state->pos >= state->size;
391}
392
393int state_fseek(void *file, long offset, int whence)
394{
395 struct savestate_state *state = file;
396
397 switch (whence) {
398 case SEEK_SET:
399 state->pos = offset;
400 break;
401 case SEEK_CUR:
402 state->pos += offset;
403 break;
404 case SEEK_END:
405 state->pos = state->size + offset;
406 break;
407 }
408 return (int)state->pos;
409}
410
411/* savestate sizes vary wildly depending if cd/32x or
412 * carthw is active, so run the whole thing to get size */
2446536b 413size_t retro_serialize_size(void)
414{
86b38dc4 415 struct savestate_state state = { 0, };
416 int ret;
417
418 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
419 if (ret != 0)
420 return 0;
421
422 return state.pos;
2446536b 423}
424
425bool retro_serialize(void *data, size_t size)
426{
86b38dc4 427 struct savestate_state state = { 0, };
428 int ret;
429
430 state.save_buf = data;
431 state.size = size;
432 state.pos = 0;
433
434 ret = PicoStateFP(&state, 1, NULL, state_write,
435 NULL, state_fseek);
436 return ret == 0;
2446536b 437}
438
439bool retro_unserialize(const void *data, size_t size)
440{
86b38dc4 441 struct savestate_state state = { 0, };
442 int ret;
443
444 state.load_buf = data;
445 state.size = size;
446 state.pos = 0;
447
448 ret = PicoStateFP(&state, 0, state_read, NULL,
449 state_eof, state_fseek);
450 return ret == 0;
2446536b 451}
452
453/* cheats - TODO */
454void retro_cheat_reset(void)
455{
456}
457
458void retro_cheat_set(unsigned index, bool enabled, const char *code)
459{
460}
461
462/* multidisk support */
463static bool disk_ejected;
464static unsigned int disk_current_index;
465static unsigned int disk_count;
466static struct disks_state {
467 char *fname;
468} disks[8];
469
470static bool disk_set_eject_state(bool ejected)
471{
472 // TODO?
473 disk_ejected = ejected;
474 return true;
475}
476
477static bool disk_get_eject_state(void)
478{
479 return disk_ejected;
480}
481
482static unsigned int disk_get_image_index(void)
483{
484 return disk_current_index;
485}
486
487static bool disk_set_image_index(unsigned int index)
488{
274fcc35 489 enum cd_img_type cd_type;
2446536b 490 int ret;
491
492 if (index >= sizeof(disks) / sizeof(disks[0]))
493 return false;
494
495 if (disks[index].fname == NULL) {
f5d4045b 496 if (log_cb)
497 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
2446536b 498
499 // RetroArch specifies "no disk" with index == count,
500 // so don't fail here..
501 disk_current_index = index;
502 return true;
503 }
504
f5d4045b 505 if (log_cb)
506 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
507 disks[index].fname);
2446536b 508
509 ret = -1;
510 cd_type = PicoCdCheck(disks[index].fname, NULL);
511 if (cd_type != CIT_NOT_CD)
274fcc35 512 ret = cdd_load(disks[index].fname, cd_type);
2446536b 513 if (ret != 0) {
f5d4045b 514 if (log_cb)
515 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
2446536b 516 return 0;
517 }
518
519 disk_current_index = index;
520 return true;
521}
522
523static unsigned int disk_get_num_images(void)
524{
525 return disk_count;
526}
527
528static bool disk_replace_image_index(unsigned index,
529 const struct retro_game_info *info)
530{
531 bool ret = true;
532
533 if (index >= sizeof(disks) / sizeof(disks[0]))
534 return false;
535
536 if (disks[index].fname != NULL)
537 free(disks[index].fname);
538 disks[index].fname = NULL;
539
540 if (info != NULL) {
541 disks[index].fname = strdup(info->path);
542 if (index == disk_current_index)
543 ret = disk_set_image_index(index);
544 }
545
546 return ret;
547}
548
549static bool disk_add_image_index(void)
550{
551 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
552 return false;
553
554 disk_count++;
555 return true;
556}
557
558static 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,
566};
567
568static void disk_tray_open(void)
569{
f5d4045b 570 if (log_cb)
571 log_cb(RETRO_LOG_INFO, "cd tray open\n");
2446536b 572 disk_ejected = 1;
573}
574
575static void disk_tray_close(void)
576{
f5d4045b 577 if (log_cb)
578 log_cb(RETRO_LOG_INFO, "cd tray close\n");
2446536b 579 disk_ejected = 0;
580}
581
582
583static const char * const biosfiles_us[] = {
b08a2950 584 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
2446536b 585};
586static const char * const biosfiles_eu[] = {
b08a2950 587 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
2446536b 588};
589static const char * const biosfiles_jp[] = {
b08a2950 590 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
2446536b 591};
592
593static void make_system_path(char *buf, size_t buf_size,
594 const char *name, const char *ext)
595{
596 const char *dir = NULL;
597
598 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
599 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
600 }
601 else {
602 snprintf(buf, buf_size, "%s%s", name, ext);
603 }
604}
605
606static const char *find_bios(int *region, const char *cd_fname)
607{
608 const char * const *files;
609 static char path[256];
610 int i, count;
611 FILE *f = NULL;
612
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 *);
622 } else {
623 return NULL;
624 }
625
626 for (i = 0; i < count; i++)
627 {
628 make_system_path(path, sizeof(path), files[i], ".bin");
629 f = fopen(path, "rb");
630 if (f != NULL)
631 break;
632
633 make_system_path(path, sizeof(path), files[i], ".zip");
634 f = fopen(path, "rb");
635 if (f != NULL)
636 break;
637 }
638
639 if (f != NULL) {
f5d4045b 640 if (log_cb)
641 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
2446536b 642 fclose(f);
643 return path;
644 }
645
646 return NULL;
647}
648
649bool retro_load_game(const struct retro_game_info *info)
650{
651 enum media_type_e media_type;
652 static char carthw_path[256];
653 size_t i;
654
655 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
656 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
f5d4045b 657 if (log_cb)
658 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
2446536b 659 return false;
660 }
661
662 if (info == NULL || info->path == NULL) {
f5d4045b 663 if (log_cb)
664 log_cb(RETRO_LOG_ERROR, "info->path required\n");
2446536b 665 return false;
666 }
667
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;
672 }
673 }
674
675 disk_current_index = 0;
676 disk_count = 1;
677 disks[0].fname = strdup(info->path);
678
679 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
680
681 media_type = PicoLoadMedia(info->path, carthw_path,
682 find_bios, NULL);
683
684 switch (media_type) {
685 case PM_BAD_DETECT:
f5d4045b 686 if (log_cb)
687 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
2446536b 688 return false;
689 case PM_BAD_CD:
f5d4045b 690 if (log_cb)
691 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
2446536b 692 return false;
693 case PM_BAD_CD_NO_BIOS:
f5d4045b 694 if (log_cb)
695 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
2446536b 696 return false;
697 case PM_ERROR:
f5d4045b 698 if (log_cb)
699 log_cb(RETRO_LOG_ERROR, "Load error\n");
2446536b 700 return false;
701 default:
702 break;
703 }
704
705 PicoLoopPrepare();
706
707 PicoWriteSound = snd_write;
708 memset(sndBuffer, 0, sizeof(sndBuffer));
709 PsndOut = sndBuffer;
27f190ea 710 PsndRerate(0);
2446536b 711
712 return true;
713}
714
715bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
716{
717 return false;
718}
719
720void retro_unload_game(void)
721{
722}
723
724unsigned retro_get_region(void)
725{
726 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
727}
728
729void *retro_get_memory_data(unsigned id)
730{
731 if (id != RETRO_MEMORY_SAVE_RAM)
732 return NULL;
733
734 if (PicoAHW & PAHW_MCD)
735 return Pico_mcd->bram;
736 else
737 return SRam.data;
738}
739
740size_t retro_get_memory_size(unsigned id)
741{
0fd6751d 742 unsigned int i;
743 int sum;
744
2446536b 745 if (id != RETRO_MEMORY_SAVE_RAM)
746 return 0;
747
748 if (PicoAHW & PAHW_MCD)
749 // bram
750 return 0x2000;
0fd6751d 751
752 if (Pico.m.frame_count == 0)
2446536b 753 return SRam.size;
0fd6751d 754
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++)
758 sum |= SRam.data[i];
759
760 return (sum != 0) ? SRam.size : 0;
2446536b 761}
762
763void retro_reset(void)
764{
765 PicoReset();
766}
767
768static 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,
781};
782#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
783
784static void snd_write(int len)
785{
786 audio_batch_cb(PsndOut, len / 4);
787}
788
531a8f38 789static enum input_device input_name_to_val(const char *name)
790{
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;
797
f5d4045b 798 if (log_cb)
799 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
531a8f38 800 return PICO_INPUT_PAD_3BTN;
801}
802
803static void update_variables(void)
804{
805 struct retro_variable var;
806
807 var.value = NULL;
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));
811
812 var.value = NULL;
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));
0185b677 816
27f190ea 817 var.value = NULL;
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;
822 else
823 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
824 }
825
826 var.value = NULL;
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;
831 else
832 PicoOpt &= ~POPT_EN_MCD_RAMCART;
833 }
834
0185b677 835#ifdef DRC_SH2
836 var.value = NULL;
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;
841 else
842 PicoOpt &= ~POPT_EN_DRC;
843 }
844#endif
531a8f38 845}
846
2446536b 847void retro_run(void)
848{
849 bool updated = false;
850 int pad, i;
851
852 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
531a8f38 853 update_variables();
2446536b 854
855 input_poll_cb();
856
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];
862
863 PicoFrame();
864
51c08950 865 video_cb((short *)vout_buf + vout_offset,
866 vout_width, vout_height, vout_width * 2);
2446536b 867}
868
869void retro_init(void)
870{
f5d4045b 871 struct retro_log_callback log;
2446536b 872 int level;
873
2446536b 874 level = 0;
875 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
876
c681e48d 877 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
f5d4045b 878 log_cb = log.log;
c681e48d 879 else
880 log_cb = NULL;
f5d4045b 881
2446536b 882 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
883
884 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
720bfc5d 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;
888#ifdef __arm__
92dfd9af 889 PicoOpt |= POPT_EN_DRC;
720bfc5d 890#endif
2446536b 891 PsndRate = 44100;
892 PicoAutoRgnOrder = 0x184; // US, EU, JP
2446536b 893
2446536b 894 vout_width = 320;
895 vout_height = 240;
896 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
897
898 PicoInit();
41946d70 899 PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b 900 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
901
902 //PicoMessage = plat_status_msg_busy_next;
903 PicoMCDopenTray = disk_tray_open;
904 PicoMCDcloseTray = disk_tray_close;
531a8f38 905
906 update_variables();
2446536b 907}
908
909void retro_deinit(void)
910{
911 PicoExit();
912}
fast MegaDrive/MegaCD/32X emulator