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[picodrive.git] / platform / libretro / libretro.c
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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
f18d0e08 14#ifndef NO_MMAP
2446536b 15#include <sys/mman.h>
f18d0e08 16#endif
e8b61936 17#else
6f1133bc 18#include <io.h>
e8b61936 19#include <windows.h>
6f1133bc 20#include <sys/types.h>
e8b61936 21#endif
c25d78ee 22#include <errno.h>
2446536b 23#ifdef __MACH__
24#include <libkern/OSCacheControl.h>
25#endif
26
27#include <pico/pico_int.h>
86b38dc4 28#include <pico/state.h>
5345c2b9
T		 29#include "../common/input_pico.h"
30#include "../common/version.h"
2446536b 31#include "libretro.h"
32
f5d4045b 33static retro_log_printf_t log_cb;
2446536b 34static retro_video_refresh_t video_cb;
35static retro_input_poll_t input_poll_cb;
36static retro_input_state_t input_state_cb;
37static retro_environment_t environ_cb;
38static retro_audio_sample_batch_t audio_batch_cb;
39
2446536b 40#define VOUT_MAX_WIDTH 320
41#define VOUT_MAX_HEIGHT 240
42static void *vout_buf;
51c08950 43static int vout_width, vout_height, vout_offset;
2446536b 44
ed06ffd3
T		 45#ifdef _MSC_VER
46static short sndBuffer[2*44100/50];
47#else
2446536b 48static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
ed06ffd3 49#endif
2446536b 50
2446536b 51static void snd_write(int len);
52
53#ifdef _WIN32
54#define SLASH '\\'
55#else
56#define SLASH '/'
57#endif
58
59/* functions called by the core */
60
61void cache_flush_d_inval_i(void *start, void *end)
62{
63#ifdef __arm__
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);
70#else
71 __clear_cache(start, end);
72#endif
73#endif
74}
75
e8b61936 76#ifdef _WIN32
6f1133bc
T		 77/* mmap() replacement for Windows
78 *
79 * Author: Mike Frysinger <vapier@gentoo.org>
80 * Placed into the public domain
81 */
82
83/* References:
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
88 */
89
90#define PROT_READ 0x1
91#define PROT_WRITE 0x2
92/* This flag is only available in WinXP+ */
93#ifdef FILE_MAP_EXECUTE
94#define PROT_EXEC 0x4
95#else
96#define PROT_EXEC 0x0
97#define FILE_MAP_EXECUTE 0
98#endif
99
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)
105
106#ifdef __USE_FILE_OFFSET64
107# define DWORD_HI(x) (x >> 32)
108# define DWORD_LO(x) ((x) & 0xffffffff)
109#else
110# define DWORD_HI(x) (0)
111# define DWORD_LO(x) (x)
112#endif
113
114static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
2446536b 115{
ed06ffd3
T		 116 uint32_t flProtect, dwDesiredAccess;
117 off_t end;
118 HANDLE mmap_fd, h;
119 void *ret;
120
6f1133bc
T		 121 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
122 return MAP_FAILED;
123 if (fd == -1) {
124 if (!(flags & MAP_ANON) || offset)
125 return MAP_FAILED;
126 } else if (flags & MAP_ANON)
127 return MAP_FAILED;
128
6f1133bc
T		 129 if (prot & PROT_WRITE) {
130 if (prot & PROT_EXEC)
131 flProtect = PAGE_EXECUTE_READWRITE;
132 else
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;
139 } else
140 flProtect = PAGE_READONLY;
141
ed06ffd3
T		 142 end = length + offset;
143
6f1133bc
T		 144 if (fd == -1)
145 mmap_fd = INVALID_HANDLE_VALUE;
146 else
147 mmap_fd = (HANDLE)_get_osfhandle(fd);
148 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
149 if (h == NULL)
150 return MAP_FAILED;
151
6f1133bc
T		 152 if (prot & PROT_WRITE)
153 dwDesiredAccess = FILE_MAP_WRITE;
154 else
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;
ed06ffd3 160 ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
6f1133bc
T		 161 if (ret == NULL) {
162 CloseHandle(h);
163 ret = MAP_FAILED;
164 }
165 return ret;
e8b61936 166}
2446536b 167
6f1133bc 168static void munmap(void *addr, size_t length)
e8b61936 169{
6f1133bc
T		 170 UnmapViewOfFile(addr);
171 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
e8b61936 172}
f18d0e08 173#elif defined(NO_MMAP)
5345c2b9 174#define PROT_EXEC 0x04
f18d0e08 175#define MAP_FAILED 0
176#define PROT_READ 0
177#define PROT_WRITE 0
178#define MAP_PRIVATE 0
179#define MAP_ANONYMOUS 0
180
181void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off)
182{
183 return malloc(len);
184}
185
186void munmap(void *base_addr, size_t len)
187{
188 free(base_addr);
189}
190
191int mprotect(void *addr, size_t len, int prot)
192{
193 /* stub - not really needed at this point since this codepath has no dynarecs */
194 return 0;
195}
196
e8b61936 197#endif
8e5639bc 198
199#ifndef MAP_ANONYMOUS
200#define MAP_ANONYMOUS MAP_ANON
201#endif
202
e8b61936 203void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
204{
e8b61936 205 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
206 void *req, *ret;
207
208 req = (void *)addr;
209 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
210 if (ret == MAP_FAILED) {
f5d4045b 211 if (log_cb)
212 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
e8b61936 213 return NULL;
214 }
215
216 if (addr != 0 && ret != (void *)addr) {
f5d4045b 217 if (log_cb)
218 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
219 addr, ret);
e8b61936 220
221 if (is_fixed) {
222 munmap(ret, size);
223 return NULL;
224 }
225 }
2446536b 226
227 return ret;
228}
229
230void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
231{
8c8b7284 232#ifdef __linux__
2446536b 233 void *ret = mremap(ptr, oldsize, newsize, 0);
234 if (ret == MAP_FAILED)
235 return NULL;
236
237 return ret;
8c8b7284 238#else
239 void *tmp, *ret;
240 size_t preserve_size;
241
242 preserve_size = oldsize;
243 if (preserve_size > newsize)
244 preserve_size = newsize;
245 tmp = malloc(preserve_size);
246 if (tmp == NULL)
247 return NULL;
248 memcpy(tmp, ptr, preserve_size);
249
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) {
254 free(tmp);
255 return NULL;
256 }
257 memcpy(ret, tmp, preserve_size);
258 free(tmp);
259 return ret;
260#endif
2446536b 261}
262
263void plat_munmap(void *ptr, size_t size)
264{
265 if (ptr != NULL)
266 munmap(ptr, size);
267}
268
c25d78ee 269int plat_mem_set_exec(void *ptr, size_t size)
270{
e8b61936 271#ifdef _WIN32
272 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
f5d4045b 273 if (ret == 0 && log_cb)
274 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
e8b61936 275#else
276 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
f5d4045b 277 if (ret != 0 && log_cb)
278 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
e8b61936 279#endif
c25d78ee 280 return ret;
281}
282
2446536b 283void emu_video_mode_change(int start_line, int line_count, int is_32cols)
284{
285 memset(vout_buf, 0, 320 * 240 * 2);
286 vout_width = is_32cols ? 256 : 320;
287 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
51c08950 288
289 vout_height = line_count;
290 vout_offset = vout_width * start_line;
2446536b 291}
292
293void emu_32x_startup(void)
294{
2446536b 295}
296
2446536b 297void lprintf(const char *fmt, ...)
298{
c681e48d 299 char buffer[256];
300 va_list ap;
301 va_start(ap, fmt);
302 vsprintf(buffer, fmt, ap);
f5d4045b 303 /* TODO - add 'level' param for warning/error messages? */
304 if (log_cb)
c681e48d 305 log_cb(RETRO_LOG_INFO, "%s\n", fmt);
2446536b 306}
307
2446536b 308/* libretro */
309void retro_set_environment(retro_environment_t cb)
310{
311 static const struct retro_variable vars[] = {
312 //{ "region", "Region; Auto|NTSC|PAL" },
531a8f38 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" },
27f190ea 315 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
316 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
0185b677 317#ifdef DRC_SH2
318 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
319#endif
2446536b 320 { NULL, NULL },
321 };
322
323 environ_cb = cb;
324
325 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
326}
327
328void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
329void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
330void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
331void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
332void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
333
334unsigned retro_api_version(void)
335{
336 return RETRO_API_VERSION;
337}
338
339void retro_set_controller_port_device(unsigned port, unsigned device)
340{
341}
342
343void retro_get_system_info(struct retro_system_info *info)
344{
345 memset(info, 0, sizeof(*info));
346 info->library_name = "PicoDrive";
347 info->library_version = VERSION;
53b2e51c 348 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
2446536b 349 info->need_fullpath = true;
350}
351
352void retro_get_system_av_info(struct retro_system_av_info *info)
353{
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;
51c08950 358 info->geometry.base_height = vout_height;
2446536b 359 info->geometry.max_width = VOUT_MAX_WIDTH;
360 info->geometry.max_height = VOUT_MAX_HEIGHT;
51c08950 361 info->geometry.aspect_ratio = 0.0f;
2446536b 362}
363
86b38dc4 364/* savestates */
365struct savestate_state {
366 const char *load_buf;
367 char *save_buf;
368 size_t size;
369 size_t pos;
370};
371
372size_t state_read(void *p, size_t size, size_t nmemb, void *file)
373{
374 struct savestate_state *state = file;
375 size_t bsize = size * nmemb;
376
377 if (state->pos + bsize > state->size) {
f5d4045b 378 if (log_cb)
379 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
380 state->pos + bsize, state->size);
86b38dc4 381 bsize = state->size - state->pos;
382 if ((int)bsize <= 0)
383 return 0;
384 }
385
386 memcpy(p, state->load_buf + state->pos, bsize);
387 state->pos += bsize;
388 return bsize;
389}
390
391size_t state_write(void *p, size_t size, size_t nmemb, void *file)
392{
393 struct savestate_state *state = file;
394 size_t bsize = size * nmemb;
395
396 if (state->pos + bsize > state->size) {
f5d4045b 397 if (log_cb)
398 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
399 state->pos + bsize, state->size);
86b38dc4 400 bsize = state->size - state->pos;
401 if ((int)bsize <= 0)
402 return 0;
403 }
404
405 memcpy(state->save_buf + state->pos, p, bsize);
406 state->pos += bsize;
407 return bsize;
408}
409
410size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
411{
412 struct savestate_state *state = file;
413 size_t bsize = size * nmemb;
414
415 state->pos += bsize;
416 return bsize;
417}
418
419size_t state_eof(void *file)
420{
421 struct savestate_state *state = file;
422
423 return state->pos >= state->size;
424}
425
426int state_fseek(void *file, long offset, int whence)
427{
428 struct savestate_state *state = file;
429
430 switch (whence) {
431 case SEEK_SET:
432 state->pos = offset;
433 break;
434 case SEEK_CUR:
435 state->pos += offset;
436 break;
437 case SEEK_END:
438 state->pos = state->size + offset;
439 break;
440 }
441 return (int)state->pos;
442}
443
444/* savestate sizes vary wildly depending if cd/32x or
445 * carthw is active, so run the whole thing to get size */
2446536b 446size_t retro_serialize_size(void)
447{
86b38dc4 448 struct savestate_state state = { 0, };
449 int ret;
450
451 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
452 if (ret != 0)
453 return 0;
454
455 return state.pos;
2446536b 456}
457
458bool retro_serialize(void *data, size_t size)
459{
86b38dc4 460 struct savestate_state state = { 0, };
461 int ret;
462
463 state.save_buf = data;
464 state.size = size;
465 state.pos = 0;
466
467 ret = PicoStateFP(&state, 1, NULL, state_write,
468 NULL, state_fseek);
469 return ret == 0;
2446536b 470}
471
472bool retro_unserialize(const void *data, size_t size)
473{
86b38dc4 474 struct savestate_state state = { 0, };
475 int ret;
476
477 state.load_buf = data;
478 state.size = size;
479 state.pos = 0;
480
481 ret = PicoStateFP(&state, 0, state_read, NULL,
482 state_eof, state_fseek);
483 return ret == 0;
2446536b 484}
485
486/* cheats - TODO */
487void retro_cheat_reset(void)
488{
489}
490
491void retro_cheat_set(unsigned index, bool enabled, const char *code)
492{
493}
494
495/* multidisk support */
496static bool disk_ejected;
497static unsigned int disk_current_index;
498static unsigned int disk_count;
499static struct disks_state {
500 char *fname;
501} disks[8];
502
503static bool disk_set_eject_state(bool ejected)
504{
505 // TODO?
506 disk_ejected = ejected;
507 return true;
508}
509
510static bool disk_get_eject_state(void)
511{
512 return disk_ejected;
513}
514
515static unsigned int disk_get_image_index(void)
516{
517 return disk_current_index;
518}
519
520static bool disk_set_image_index(unsigned int index)
521{
274fcc35 522 enum cd_img_type cd_type;
2446536b 523 int ret;
524
525 if (index >= sizeof(disks) / sizeof(disks[0]))
526 return false;
527
528 if (disks[index].fname == NULL) {
f5d4045b 529 if (log_cb)
530 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
2446536b 531
532 // RetroArch specifies "no disk" with index == count,
533 // so don't fail here..
534 disk_current_index = index;
535 return true;
536 }
537
f5d4045b 538 if (log_cb)
539 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
540 disks[index].fname);
2446536b 541
542 ret = -1;
543 cd_type = PicoCdCheck(disks[index].fname, NULL);
544 if (cd_type != CIT_NOT_CD)
274fcc35 545 ret = cdd_load(disks[index].fname, cd_type);
2446536b 546 if (ret != 0) {
f5d4045b 547 if (log_cb)
548 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
2446536b 549 return 0;
550 }
551
552 disk_current_index = index;
553 return true;
554}
555
556static unsigned int disk_get_num_images(void)
557{
558 return disk_count;
559}
560
561static bool disk_replace_image_index(unsigned index,
562 const struct retro_game_info *info)
563{
564 bool ret = true;
565
566 if (index >= sizeof(disks) / sizeof(disks[0]))
567 return false;
568
569 if (disks[index].fname != NULL)
570 free(disks[index].fname);
571 disks[index].fname = NULL;
572
573 if (info != NULL) {
574 disks[index].fname = strdup(info->path);
575 if (index == disk_current_index)
576 ret = disk_set_image_index(index);
577 }
578
579 return ret;
580}
581
582static bool disk_add_image_index(void)
583{
584 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
585 return false;
586
587 disk_count++;
588 return true;
589}
590
591static struct retro_disk_control_callback disk_control = {
ed06ffd3
T		 592 disk_set_eject_state,
593 disk_get_eject_state,
594 disk_get_image_index,
595 disk_set_image_index,
596 disk_get_num_images,
597 disk_replace_image_index,
598 disk_add_image_index,
2446536b 599};
600
601static void disk_tray_open(void)
602{
f5d4045b 603 if (log_cb)
604 log_cb(RETRO_LOG_INFO, "cd tray open\n");
2446536b 605 disk_ejected = 1;
606}
607
608static void disk_tray_close(void)
609{
f5d4045b 610 if (log_cb)
611 log_cb(RETRO_LOG_INFO, "cd tray close\n");
2446536b 612 disk_ejected = 0;
613}
614
615
616static const char * const biosfiles_us[] = {
b08a2950 617 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
2446536b 618};
619static const char * const biosfiles_eu[] = {
b08a2950 620 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
2446536b 621};
622static const char * const biosfiles_jp[] = {
b08a2950 623 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
2446536b 624};
625
626static void make_system_path(char *buf, size_t buf_size,
627 const char *name, const char *ext)
628{
629 const char *dir = NULL;
630
631 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
632 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
633 }
634 else {
635 snprintf(buf, buf_size, "%s%s", name, ext);
636 }
637}
638
639static const char *find_bios(int *region, const char *cd_fname)
640{
641 const char * const *files;
642 static char path[256];
643 int i, count;
644 FILE *f = NULL;
645
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 *);
655 } else {
656 return NULL;
657 }
658
659 for (i = 0; i < count; i++)
660 {
661 make_system_path(path, sizeof(path), files[i], ".bin");
662 f = fopen(path, "rb");
663 if (f != NULL)
664 break;
665
666 make_system_path(path, sizeof(path), files[i], ".zip");
667 f = fopen(path, "rb");
668 if (f != NULL)
669 break;
670 }
671
672 if (f != NULL) {
f5d4045b 673 if (log_cb)
674 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
2446536b 675 fclose(f);
676 return path;
677 }
678
679 return NULL;
680}
681
682bool retro_load_game(const struct retro_game_info *info)
683{
684 enum media_type_e media_type;
685 static char carthw_path[256];
686 size_t i;
687
688 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
689 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
f5d4045b 690 if (log_cb)
691 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
2446536b 692 return false;
693 }
694
695 if (info == NULL || info->path == NULL) {
f5d4045b 696 if (log_cb)
697 log_cb(RETRO_LOG_ERROR, "info->path required\n");
2446536b 698 return false;
699 }
700
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;
705 }
706 }
707
708 disk_current_index = 0;
709 disk_count = 1;
710 disks[0].fname = strdup(info->path);
711
712 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
713
714 media_type = PicoLoadMedia(info->path, carthw_path,
715 find_bios, NULL);
716
717 switch (media_type) {
718 case PM_BAD_DETECT:
f5d4045b 719 if (log_cb)
720 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
2446536b 721 return false;
722 case PM_BAD_CD:
f5d4045b 723 if (log_cb)
724 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
2446536b 725 return false;
726 case PM_BAD_CD_NO_BIOS:
f5d4045b 727 if (log_cb)
728 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
2446536b 729 return false;
730 case PM_ERROR:
f5d4045b 731 if (log_cb)
732 log_cb(RETRO_LOG_ERROR, "Load error\n");
2446536b 733 return false;
734 default:
735 break;
736 }
737
738 PicoLoopPrepare();
739
740 PicoWriteSound = snd_write;
741 memset(sndBuffer, 0, sizeof(sndBuffer));
742 PsndOut = sndBuffer;
27f190ea 743 PsndRerate(0);
2446536b 744
745 return true;
746}
747
748bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
749{
750 return false;
751}
752
753void retro_unload_game(void)
754{
755}
756
757unsigned retro_get_region(void)
758{
759 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
760}
761
762void *retro_get_memory_data(unsigned id)
763{
764 if (id != RETRO_MEMORY_SAVE_RAM)
765 return NULL;
766
767 if (PicoAHW & PAHW_MCD)
768 return Pico_mcd->bram;
769 else
770 return SRam.data;
771}
772
773size_t retro_get_memory_size(unsigned id)
774{
0fd6751d 775 unsigned int i;
776 int sum;
777
2446536b 778 if (id != RETRO_MEMORY_SAVE_RAM)
779 return 0;
780
781 if (PicoAHW & PAHW_MCD)
782 // bram
783 return 0x2000;
0fd6751d 784
785 if (Pico.m.frame_count == 0)
2446536b 786 return SRam.size;
0fd6751d 787
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++)
791 sum |= SRam.data[i];
792
793 return (sum != 0) ? SRam.size : 0;
2446536b 794}
795
796void retro_reset(void)
797{
798 PicoReset();
799}
800
801static const unsigned short retro_pico_map[] = {
ed06ffd3
T		 802 1 << GBTN_B,
803 1 << GBTN_A,
804 1 << GBTN_MODE,
805 1 << GBTN_START,
806 1 << GBTN_UP,
807 1 << GBTN_DOWN,
808 1 << GBTN_LEFT,
809 1 << GBTN_RIGHT,
810 1 << GBTN_C,
811 1 << GBTN_Y,
812 1 << GBTN_X,
813 1 << GBTN_Z,
2446536b 814};
815#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
816
817static void snd_write(int len)
818{
819 audio_batch_cb(PsndOut, len / 4);
820}
821
531a8f38 822static enum input_device input_name_to_val(const char *name)
823{
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;
830
f5d4045b 831 if (log_cb)
832 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
531a8f38 833 return PICO_INPUT_PAD_3BTN;
834}
835
836static void update_variables(void)
837{
838 struct retro_variable var;
839
840 var.value = NULL;
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));
844
845 var.value = NULL;
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));
0185b677 849
27f190ea 850 var.value = NULL;
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;
855 else
856 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
857 }
858
859 var.value = NULL;
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;
864 else
865 PicoOpt &= ~POPT_EN_MCD_RAMCART;
866 }
867
0185b677 868#ifdef DRC_SH2
869 var.value = NULL;
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;
874 else
875 PicoOpt &= ~POPT_EN_DRC;
876 }
877#endif
531a8f38 878}
879
2446536b 880void retro_run(void)
881{
882 bool updated = false;
883 int pad, i;
884
885 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
531a8f38 886 update_variables();
2446536b 887
888 input_poll_cb();
889
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];
895
896 PicoFrame();
897
51c08950 898 video_cb((short *)vout_buf + vout_offset,
899 vout_width, vout_height, vout_width * 2);
2446536b 900}
901
2f832b7f 902static void check_system_specs(void)
903{
904 /* TODO - set different performance level for 32X - 6 for ARM dynarec, higher for interpreter core */
905 unsigned level = 5;
906 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
907}
908
2446536b 909void retro_init(void)
910{
f5d4045b 911 struct retro_log_callback log;
2446536b 912 int level;
913
2446536b 914 level = 0;
915 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
916
c681e48d 917 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
f5d4045b 918 log_cb = log.log;
c681e48d 919 else
920 log_cb = NULL;
f5d4045b 921
2446536b 922 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
923
924 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
720bfc5d 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;
928#ifdef __arm__
92dfd9af 929 PicoOpt |= POPT_EN_DRC;
720bfc5d 930#endif
2446536b 931 PsndRate = 44100;
932 PicoAutoRgnOrder = 0x184; // US, EU, JP
2446536b 933
2446536b 934 vout_width = 320;
935 vout_height = 240;
936 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
937
938 PicoInit();
41946d70 939 PicoDrawSetOutFormat(PDF_RGB555, 0);
2446536b 940 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
941
942 //PicoMessage = plat_status_msg_busy_next;
943 PicoMCDopenTray = disk_tray_open;
944 PicoMCDcloseTray = disk_tray_close;
531a8f38 945
946 update_variables();
2446536b 947}
948
949void retro_deinit(void)
950{
951 PicoExit();
952}
fast MegaDrive/MegaCD/32X emulator