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add a hack for Decap Attack
[picodrive.git] / libretro / libretro.c
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1/*
2 * libretro core glue for PicoDrive
3 * (C) notaz, 2013
4 * (C) aliaspider, 2016
5 * (C) Daniel De Matteis, 2013
6 *
7 * This work is licensed under the terms of MAME license.
8 * See COPYING file in the top-level directory.
9 */
10
11#define _GNU_SOURCE 1 // mremap
12#include <stdio.h>
13#include <stdarg.h>
14#include <string.h>
15#ifndef _WIN32
16#ifndef NO_MMAP
17#include <sys/mman.h>
18#endif
19#else
20#include <io.h>
21#include <windows.h>
22#include <sys/types.h>
23#endif
24#include <errno.h>
25#ifdef __MACH__
26#include <libkern/OSCacheControl.h>
27#endif
28
29#ifdef _3DS
30#include "3ds/3ds_utils.h"
31#define MEMOP_MAP 4
32#define MEMOP_UNMAP 5
33#define MEMOP_PROT 6
34
35int svcDuplicateHandle(unsigned int* out, unsigned int original);
36int svcCloseHandle(unsigned int handle);
37int svcControlProcessMemory(unsigned int process, void* addr0, void* addr1,
38 unsigned int size, unsigned int type, unsigned int perm);
39void* linearMemAlign(size_t size, size_t alignment);
40void linearFree(void* mem);
41
42static int ctr_svchack_successful = 0;
43
44#elif defined(VITA)
45#define TARGET_SIZE_2 24 // 2^24 = 16 megabytes
46
47#include <psp2/kernel/sysmem.h>
48static int sceBlock;
49int getVMBlock();
50int _newlib_vm_size_user = 1 << TARGET_SIZE_2;
51
52#endif
53
54#include <pico/pico_int.h>
55#include <pico/state.h>
56#include "../common/input_pico.h"
57#include "../common/version.h"
58#include "libretro.h"
59
60static retro_log_printf_t log_cb;
61static retro_video_refresh_t video_cb;
62static retro_input_poll_t input_poll_cb;
63static retro_input_state_t input_state_cb;
64static retro_environment_t environ_cb;
65static retro_audio_sample_batch_t audio_batch_cb;
66
67#define VOUT_MAX_WIDTH 320
68#define VOUT_MAX_HEIGHT 240
69
70static const float VOUT_PAR = 0.0;
71static const float VOUT_4_3 = (224.0f * (4.0f / 3.0f));
72static const float VOUT_CRT = (224.0f * 1.29911f);
73
74bool show_overscan = false;
75
76static void *vout_buf;
77static int vout_width, vout_height, vout_offset;
78static float user_vout_width = 0.0;
79
80#ifdef _MSC_VER
81static short sndBuffer[2*44100/50];
82#else
83static short __attribute__((aligned(4))) sndBuffer[2*44100/50];
84#endif
85
86static void snd_write(int len);
87
88#ifdef _WIN32
89#define SLASH '\\'
90#else
91#define SLASH '/'
92#endif
93
94/* functions called by the core */
95
96void cache_flush_d_inval_i(void *start, void *end)
97{
98#ifdef __arm__
99 size_t len = (char *)end - (char *)start;
100#if defined(__BLACKBERRY_QNX__)
101 msync(start, end - start, MS_SYNC | MS_CACHE_ONLY | MS_INVALIDATE_ICACHE);
102#elif defined(__MACH__)
103 sys_dcache_flush(start, len);
104 sys_icache_invalidate(start, len);
105#elif defined(_3DS)
106 ctr_flush_invalidate_cache();
107#elif defined(VITA)
108 sceKernelSyncVMDomain(sceBlock, start, len);
109#else
110 __clear_cache(start, end);
111#endif
112#endif
113}
114
115#ifdef _WIN32
116/* mmap() replacement for Windows
117 *
118 * Author: Mike Frysinger <vapier@gentoo.org>
119 * Placed into the public domain
120 */
121
122/* References:
123 * CreateFileMapping: http://msdn.microsoft.com/en-us/library/aa366537(VS.85).aspx
124 * CloseHandle: http://msdn.microsoft.com/en-us/library/ms724211(VS.85).aspx
125 * MapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366761(VS.85).aspx
126 * UnmapViewOfFile: http://msdn.microsoft.com/en-us/library/aa366882(VS.85).aspx
127 */
128
129#define PROT_READ 0x1
130#define PROT_WRITE 0x2
131/* This flag is only available in WinXP+ */
132#ifdef FILE_MAP_EXECUTE
133#define PROT_EXEC 0x4
134#else
135#define PROT_EXEC 0x0
136#define FILE_MAP_EXECUTE 0
137#endif
138
139#define MAP_SHARED 0x01
140#define MAP_PRIVATE 0x02
141#define MAP_ANONYMOUS 0x20
142#define MAP_ANON MAP_ANONYMOUS
143#define MAP_FAILED ((void *) -1)
144
145#ifdef __USE_FILE_OFFSET64
146# define DWORD_HI(x) (x >> 32)
147# define DWORD_LO(x) ((x) & 0xffffffff)
148#else
149# define DWORD_HI(x) (0)
150# define DWORD_LO(x) (x)
151#endif
152
153static void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
154{
155 uint32_t flProtect, dwDesiredAccess;
156 off_t end;
157 HANDLE mmap_fd, h;
158 void *ret;
159
160 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC))
161 return MAP_FAILED;
162 if (fd == -1) {
163 if (!(flags & MAP_ANON) || offset)
164 return MAP_FAILED;
165 } else if (flags & MAP_ANON)
166 return MAP_FAILED;
167
168 if (prot & PROT_WRITE) {
169 if (prot & PROT_EXEC)
170 flProtect = PAGE_EXECUTE_READWRITE;
171 else
172 flProtect = PAGE_READWRITE;
173 } else if (prot & PROT_EXEC) {
174 if (prot & PROT_READ)
175 flProtect = PAGE_EXECUTE_READ;
176 else if (prot & PROT_EXEC)
177 flProtect = PAGE_EXECUTE;
178 } else
179 flProtect = PAGE_READONLY;
180
181 end = length + offset;
182
183 if (fd == -1)
184 mmap_fd = INVALID_HANDLE_VALUE;
185 else
186 mmap_fd = (HANDLE)_get_osfhandle(fd);
187 h = CreateFileMapping(mmap_fd, NULL, flProtect, DWORD_HI(end), DWORD_LO(end), NULL);
188 if (h == NULL)
189 return MAP_FAILED;
190
191 if (prot & PROT_WRITE)
192 dwDesiredAccess = FILE_MAP_WRITE;
193 else
194 dwDesiredAccess = FILE_MAP_READ;
195 if (prot & PROT_EXEC)
196 dwDesiredAccess |= FILE_MAP_EXECUTE;
197 if (flags & MAP_PRIVATE)
198 dwDesiredAccess |= FILE_MAP_COPY;
199 ret = MapViewOfFile(h, dwDesiredAccess, DWORD_HI(offset), DWORD_LO(offset), length);
200 if (ret == NULL) {
201 CloseHandle(h);
202 ret = MAP_FAILED;
203 }
204 return ret;
205}
206
207static void munmap(void *addr, size_t length)
208{
209 UnmapViewOfFile(addr);
210 /* ruh-ro, we leaked handle from CreateFileMapping() ... */
211}
212#elif defined(NO_MMAP)
213#define PROT_EXEC 0x04
214#define MAP_FAILED 0
215#define PROT_READ 0
216#define PROT_WRITE 0
217#define MAP_PRIVATE 0
218#define MAP_ANONYMOUS 0
219
220void* mmap(void *desired_addr, size_t len, int mmap_prot, int mmap_flags, int fildes, size_t off)
221{
222 return malloc(len);
223}
224
225void munmap(void *base_addr, size_t len)
226{
227 free(base_addr);
228}
229
230int mprotect(void *addr, size_t len, int prot)
231{
232 /* stub - not really needed at this point since this codepath has no dynarecs */
233 return 0;
234}
235
236#endif
237
238#ifndef MAP_ANONYMOUS
239#define MAP_ANONYMOUS MAP_ANON
240#endif
241
242#ifdef _3DS
243typedef struct
244{
245 unsigned int requested_map;
246 void* buffer;
247}pico_mmap_t;
248
249pico_mmap_t pico_mmaps[] = {
250 {0x02000000, 0},
251 {0x06000000, 0},
252 {NULL, 0}
253};
254
255void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
256{
257 (void)is_fixed;
258
259 if (ctr_svchack_successful)
260 {
261 pico_mmap_t* pico_mmap;
262
263 for (pico_mmap = pico_mmaps; pico_mmap->requested_map; pico_mmap++)
264 {
265 if ((pico_mmap->requested_map == addr))
266 {
267 unsigned int ptr_aligned, tmp;
268 unsigned int currentHandle;
269 unsigned int perm = 0b011;
270
271 if (need_exec)
272 perm = 0b111;
273
274 size = (size + 0xFFF) & ~0xFFF;
275 pico_mmap->buffer = malloc(size + 0x1000);
276 ptr_aligned = (((unsigned int)pico_mmap->buffer) + 0xFFF) & ~0xFFF;
277
278 svcDuplicateHandle(&currentHandle, 0xFFFF8001);
279
280 if(svcControlProcessMemory(currentHandle, pico_mmap->requested_map, ptr_aligned, size, MEMOP_MAP, perm) < 0)
281 {
282 if (log_cb)
283 log_cb(RETRO_LOG_ERROR, "could not map memory @0x%08X\n", pico_mmap->requested_map);
284 exit(1);
285 }
286
287 svcCloseHandle(currentHandle);
288 return (void*)pico_mmap->requested_map;
289 }
290 }
291 }
292
293 return malloc(size);
294}
295
296void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
297{
298 if (ctr_svchack_successful)
299 {
300 pico_mmap_t* pico_mmap;
301
302 for (pico_mmap = pico_mmaps; pico_mmap->requested_map; pico_mmap++)
303 {
304 if ((pico_mmap->requested_map == (unsigned int)ptr))
305 {
306 unsigned int ptr_aligned;
307 unsigned int currentHandle;
308 void* tmp;
309
310 oldsize = (oldsize + 0xFFF) & ~0xFFF;
311 newsize = (newsize + 0xFFF) & ~0xFFF;
312 ptr_aligned = (((unsigned int)pico_mmap->buffer) + 0xFFF) & ~0xFFF;
313
314 svcDuplicateHandle(&currentHandle, 0xFFFF8001);
315
316 svcControlProcessMemory(currentHandle, pico_mmap->requested_map, ptr_aligned, oldsize, MEMOP_UNMAP, 0b011);
317
318 tmp = realloc(pico_mmap->buffer, newsize + 0x1000);
319 if(!tmp)
320 return NULL;
321
322 pico_mmap->buffer = tmp;
323 ptr_aligned = (((unsigned int)pico_mmap->buffer) + 0xFFF) & ~0xFFF;
324
325 svcControlProcessMemory(currentHandle, pico_mmap->requested_map, ptr_aligned, newsize, MEMOP_MAP, 0x3);
326
327 svcCloseHandle(currentHandle);
328
329 return ptr;
330 }
331 }
332 }
333
334 return realloc(ptr, newsize);
335
336}
337void plat_munmap(void *ptr, size_t size)
338{
339 if (ctr_svchack_successful)
340 {
341 pico_mmap_t* pico_mmap;
342
343 for (pico_mmap = pico_mmaps; pico_mmap->requested_map; pico_mmap++)
344 {
345 if ((pico_mmap->requested_map == (unsigned int)ptr))
346 {
347 unsigned int ptr_aligned;
348 unsigned int currentHandle;
349
350 size = (size + 0xFFF) & ~0xFFF;
351 ptr_aligned = (((unsigned int)pico_mmap->buffer) + 0xFFF) & ~0xFFF;
352
353 svcDuplicateHandle(&currentHandle, 0xFFFF8001);
354
355 svcControlProcessMemory(currentHandle, (void*)pico_mmap->requested_map, (void*)ptr_aligned, size, MEMOP_UNMAP, 0b011);
356
357 svcCloseHandle(currentHandle);
358
359 free(pico_mmap->buffer);
360 pico_mmap->buffer = NULL;
361 return;
362 }
363 }
364 }
365
366 free(ptr);
367}
368
369#else
370void *plat_mmap(unsigned long addr, size_t size, int need_exec, int is_fixed)
371{
372 int flags = MAP_PRIVATE | MAP_ANONYMOUS;
373 void *req, *ret;
374
375 req = (void *)addr;
376 ret = mmap(req, size, PROT_READ | PROT_WRITE, flags, -1, 0);
377 if (ret == MAP_FAILED) {
378 if (log_cb)
379 log_cb(RETRO_LOG_ERROR, "mmap(%08lx, %zd) failed: %d\n", addr, size, errno);
380 return NULL;
381 }
382
383 if (addr != 0 && ret != (void *)addr) {
384 if (log_cb)
385 log_cb(RETRO_LOG_WARN, "warning: wanted to map @%08lx, got %p\n",
386 addr, ret);
387
388 if (is_fixed) {
389 munmap(ret, size);
390 return NULL;
391 }
392 }
393
394 return ret;
395}
396
397void *plat_mremap(void *ptr, size_t oldsize, size_t newsize)
398{
399#ifdef __linux__
400 void *ret = mremap(ptr, oldsize, newsize, 0);
401 if (ret == MAP_FAILED)
402 return NULL;
403
404 return ret;
405#else
406 void *tmp, *ret;
407 size_t preserve_size;
408
409 preserve_size = oldsize;
410 if (preserve_size > newsize)
411 preserve_size = newsize;
412 tmp = malloc(preserve_size);
413 if (tmp == NULL)
414 return NULL;
415 memcpy(tmp, ptr, preserve_size);
416
417 munmap(ptr, oldsize);
418 ret = mmap(ptr, newsize, PROT_READ | PROT_WRITE,
419 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
420 if (ret == MAP_FAILED) {
421 free(tmp);
422 return NULL;
423 }
424 memcpy(ret, tmp, preserve_size);
425 free(tmp);
426 return ret;
427#endif
428}
429
430void plat_munmap(void *ptr, size_t size)
431{
432 if (ptr != NULL)
433 munmap(ptr, size);
434}
435#endif
436
437int plat_mem_set_exec(void *ptr, size_t size)
438{
439#ifdef _WIN32
440 int ret = VirtualProtect(ptr,size,PAGE_EXECUTE_READWRITE,0);
441 if (ret == 0 && log_cb)
442 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, 0);
443#elif defined(_3DS)
444 int ret = -1;
445 if (ctr_svchack_successful)
446 {
447 unsigned int currentHandle;
448 svcDuplicateHandle(&currentHandle, 0xFFFF8001);
449 ret = svcControlProcessMemory(currentHandle, ptr, 0x0,
450 size, MEMOP_PROT, 0b111);
451 svcCloseHandle(currentHandle);
452 ctr_flush_invalidate_cache();
453
454 }
455 else
456 {
457 if (log_cb)
458 log_cb(RETRO_LOG_ERROR, "plat_mem_set_exec called with no svcControlProcessMemory access\n");
459 exit(1);
460 }
461
462#elif defined(VITA)
463 int ret = sceKernelOpenVMDomain();
464#else
465 int ret = mprotect(ptr, size, PROT_READ | PROT_WRITE | PROT_EXEC);
466 if (ret != 0 && log_cb)
467 log_cb(RETRO_LOG_ERROR, "mprotect(%p, %zd) failed: %d\n", ptr, size, errno);
468#endif
469 return ret;
470}
471
472void emu_video_mode_change(int start_line, int line_count, int is_32cols)
473{
474 memset(vout_buf, 0, 320 * 240 * 2);
475 vout_width = is_32cols ? 256 : 320;
476 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
477 if (show_overscan == true) line_count += 16;
478 if (show_overscan == true) start_line -= 8;
479
480 vout_height = line_count;
481 vout_offset = vout_width * start_line;
482
483 // Update the geometry
484 struct retro_system_av_info av_info;
485 retro_get_system_av_info(&av_info);
486 environ_cb(RETRO_ENVIRONMENT_SET_GEOMETRY, &av_info);
487}
488
489void emu_32x_startup(void)
490{
491}
492
493void lprintf(const char *fmt, ...)
494{
495 char buffer[256];
496 va_list ap;
497 va_start(ap, fmt);
498 vsprintf(buffer, fmt, ap);
499 /* TODO - add 'level' param for warning/error messages? */
500 if (log_cb)
501 log_cb(RETRO_LOG_INFO, "%s", buffer);
502 va_end(ap);
503}
504
505/* libretro */
506void retro_set_environment(retro_environment_t cb)
507{
508 static const struct retro_variable vars[] = {
509 { "picodrive_input1", "Input device 1; 3 button pad|6 button pad|None" },
510 { "picodrive_input2", "Input device 2; 3 button pad|6 button pad|None" },
511 { "picodrive_sprlim", "No sprite limit; disabled|enabled" },
512 { "picodrive_ramcart", "MegaCD RAM cart; disabled|enabled" },
513 { "picodrive_region", "Region; Auto|Japan NTSC|Japan PAL|US|Europe" },
514 { "picodrive_region_fps", "Region FPS; Auto|NTSC|PAL" },
515 { "picodrive_aspect", "Core-provided aspect ratio; PAR|4/3|CRT" },
516 { "picodrive_overscan", "Show Overscan; disabled|enabled" },
517#ifdef DRC_SH2
518 { "picodrive_drc", "Dynamic recompilers; enabled|disabled" },
519#endif
520 { NULL, NULL },
521 };
522
523 environ_cb = cb;
524
525 cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void *)vars);
526}
527
528void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
529void retro_set_audio_sample(retro_audio_sample_t cb) { (void)cb; }
530void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_cb = cb; }
531void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
532void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
533
534unsigned retro_api_version(void)
535{
536 return RETRO_API_VERSION;
537}
538
539void retro_set_controller_port_device(unsigned port, unsigned device)
540{
541}
542
543void retro_get_system_info(struct retro_system_info *info)
544{
545 memset(info, 0, sizeof(*info));
546 info->library_name = "PicoDrive";
547#ifndef GIT_VERSION
548#define GIT_VERSION ""
549#endif
550 info->library_version = VERSION GIT_VERSION;
551 info->valid_extensions = "bin|gen|smd|md|32x|cue|iso|sms";
552 info->need_fullpath = true;
553}
554
555void retro_get_system_av_info(struct retro_system_av_info *info)
556{
557 memset(info, 0, sizeof(*info));
558 info->timing.fps = Pico.m.pal ? 50 : 60;
559 info->timing.sample_rate = 44100;
560 info->geometry.base_width = vout_width;
561 info->geometry.base_height = vout_height;
562 info->geometry.max_width = vout_width;
563 info->geometry.max_height = vout_height;
564
565 float common_width = vout_width;
566 if (user_vout_width != 0)
567 common_width = user_vout_width;
568
569 info->geometry.aspect_ratio = common_width / vout_height;
570}
571
572/* savestates */
573struct savestate_state {
574 const char *load_buf;
575 char *save_buf;
576 size_t size;
577 size_t pos;
578};
579
580size_t state_read(void *p, size_t size, size_t nmemb, void *file)
581{
582 struct savestate_state *state = file;
583 size_t bsize = size * nmemb;
584
585 if (state->pos + bsize > state->size) {
586 if (log_cb)
587 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
588 state->pos + bsize, state->size);
589 bsize = state->size - state->pos;
590 if ((int)bsize <= 0)
591 return 0;
592 }
593
594 memcpy(p, state->load_buf + state->pos, bsize);
595 state->pos += bsize;
596 return bsize;
597}
598
599size_t state_write(void *p, size_t size, size_t nmemb, void *file)
600{
601 struct savestate_state *state = file;
602 size_t bsize = size * nmemb;
603
604 if (state->pos + bsize > state->size) {
605 if (log_cb)
606 log_cb(RETRO_LOG_ERROR, "savestate error: %u/%u\n",
607 state->pos + bsize, state->size);
608 bsize = state->size - state->pos;
609 if ((int)bsize <= 0)
610 return 0;
611 }
612
613 memcpy(state->save_buf + state->pos, p, bsize);
614 state->pos += bsize;
615 return bsize;
616}
617
618size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
619{
620 struct savestate_state *state = file;
621 size_t bsize = size * nmemb;
622
623 state->pos += bsize;
624 return bsize;
625}
626
627size_t state_eof(void *file)
628{
629 struct savestate_state *state = file;
630
631 return state->pos >= state->size;
632}
633
634int state_fseek(void *file, long offset, int whence)
635{
636 struct savestate_state *state = file;
637
638 switch (whence) {
639 case SEEK_SET:
640 state->pos = offset;
641 break;
642 case SEEK_CUR:
643 state->pos += offset;
644 break;
645 case SEEK_END:
646 state->pos = state->size + offset;
647 break;
648 }
649 return (int)state->pos;
650}
651
652/* savestate sizes vary wildly depending if cd/32x or
653 * carthw is active, so run the whole thing to get size */
654size_t retro_serialize_size(void)
655{
656 struct savestate_state state = { 0, };
657 int ret;
658
659 ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
660 if (ret != 0)
661 return 0;
662
663 return state.pos;
664}
665
666bool retro_serialize(void *data, size_t size)
667{
668 struct savestate_state state = { 0, };
669 int ret;
670
671 state.save_buf = data;
672 state.size = size;
673 state.pos = 0;
674
675 ret = PicoStateFP(&state, 1, NULL, state_write,
676 NULL, state_fseek);
677 return ret == 0;
678}
679
680bool retro_unserialize(const void *data, size_t size)
681{
682 struct savestate_state state = { 0, };
683 int ret;
684
685 state.load_buf = data;
686 state.size = size;
687 state.pos = 0;
688
689 ret = PicoStateFP(&state, 0, state_read, NULL,
690 state_eof, state_fseek);
691 return ret == 0;
692}
693
694/* cheats - TODO */
695void retro_cheat_reset(void)
696{
697}
698
699void retro_cheat_set(unsigned index, bool enabled, const char *code)
700{
701}
702
703/* multidisk support */
704static bool disk_ejected;
705static unsigned int disk_current_index;
706static unsigned int disk_count;
707static struct disks_state {
708 char *fname;
709} disks[8];
710
711static bool disk_set_eject_state(bool ejected)
712{
713 // TODO?
714 disk_ejected = ejected;
715 return true;
716}
717
718static bool disk_get_eject_state(void)
719{
720 return disk_ejected;
721}
722
723static unsigned int disk_get_image_index(void)
724{
725 return disk_current_index;
726}
727
728static bool disk_set_image_index(unsigned int index)
729{
730 enum cd_img_type cd_type;
731 int ret;
732
733 if (index >= sizeof(disks) / sizeof(disks[0]))
734 return false;
735
736 if (disks[index].fname == NULL) {
737 if (log_cb)
738 log_cb(RETRO_LOG_ERROR, "missing disk #%u\n", index);
739
740 // RetroArch specifies "no disk" with index == count,
741 // so don't fail here..
742 disk_current_index = index;
743 return true;
744 }
745
746 if (log_cb)
747 log_cb(RETRO_LOG_INFO, "switching to disk %u: \"%s\"\n", index,
748 disks[index].fname);
749
750 ret = -1;
751 cd_type = PicoCdCheck(disks[index].fname, NULL);
752 if (cd_type != CIT_NOT_CD)
753 ret = cdd_load(disks[index].fname, cd_type);
754 if (ret != 0) {
755 if (log_cb)
756 log_cb(RETRO_LOG_ERROR, "Load failed, invalid CD image?\n");
757 return 0;
758 }
759
760 disk_current_index = index;
761 return true;
762}
763
764static unsigned int disk_get_num_images(void)
765{
766 return disk_count;
767}
768
769static bool disk_replace_image_index(unsigned index,
770 const struct retro_game_info *info)
771{
772 bool ret = true;
773
774 if (index >= sizeof(disks) / sizeof(disks[0]))
775 return false;
776
777 if (disks[index].fname != NULL)
778 free(disks[index].fname);
779 disks[index].fname = NULL;
780
781 if (info != NULL) {
782 disks[index].fname = strdup(info->path);
783 if (index == disk_current_index)
784 ret = disk_set_image_index(index);
785 }
786
787 return ret;
788}
789
790static bool disk_add_image_index(void)
791{
792 if (disk_count >= sizeof(disks) / sizeof(disks[0]))
793 return false;
794
795 disk_count++;
796 return true;
797}
798
799static struct retro_disk_control_callback disk_control = {
800 disk_set_eject_state,
801 disk_get_eject_state,
802 disk_get_image_index,
803 disk_set_image_index,
804 disk_get_num_images,
805 disk_replace_image_index,
806 disk_add_image_index,
807};
808
809static void disk_tray_open(void)
810{
811 if (log_cb)
812 log_cb(RETRO_LOG_INFO, "cd tray open\n");
813 disk_ejected = 1;
814}
815
816static void disk_tray_close(void)
817{
818 if (log_cb)
819 log_cb(RETRO_LOG_INFO, "cd tray close\n");
820 disk_ejected = 0;
821}
822
823
824static const char * const biosfiles_us[] = {
825 "us_scd2_9306", "SegaCDBIOS9303", "us_scd1_9210", "bios_CD_U"
826};
827static const char * const biosfiles_eu[] = {
828 "eu_mcd2_9306", "eu_mcd2_9303", "eu_mcd1_9210", "bios_CD_E"
829};
830static const char * const biosfiles_jp[] = {
831 "jp_mcd2_921222", "jp_mcd1_9112", "jp_mcd1_9111", "bios_CD_J"
832};
833
834static void make_system_path(char *buf, size_t buf_size,
835 const char *name, const char *ext)
836{
837 const char *dir = NULL;
838
839 if (environ_cb(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &dir) && dir) {
840 snprintf(buf, buf_size, "%s%c%s%s", dir, SLASH, name, ext);
841 }
842 else {
843 snprintf(buf, buf_size, "%s%s", name, ext);
844 }
845}
846
847static const char *find_bios(int *region, const char *cd_fname)
848{
849 const char * const *files;
850 static char path[256];
851 int i, count;
852 FILE *f = NULL;
853
854 if (*region == 4) { // US
855 files = biosfiles_us;
856 count = sizeof(biosfiles_us) / sizeof(char *);
857 } else if (*region == 8) { // EU
858 files = biosfiles_eu;
859 count = sizeof(biosfiles_eu) / sizeof(char *);
860 } else if (*region == 1 || *region == 2) {
861 files = biosfiles_jp;
862 count = sizeof(biosfiles_jp) / sizeof(char *);
863 } else {
864 return NULL;
865 }
866
867 for (i = 0; i < count; i++)
868 {
869 make_system_path(path, sizeof(path), files[i], ".bin");
870 f = fopen(path, "rb");
871 if (f != NULL)
872 break;
873
874 make_system_path(path, sizeof(path), files[i], ".zip");
875 f = fopen(path, "rb");
876 if (f != NULL)
877 break;
878 }
879
880 if (f != NULL) {
881 if (log_cb)
882 log_cb(RETRO_LOG_INFO, "using bios: %s\n", path);
883 fclose(f);
884 return path;
885 }
886
887 return NULL;
888}
889
890static void sram_reset()
891{
892 SRam.data = NULL;
893 SRam.start = 0;
894 SRam.end = 0;
895 SRam.flags = '\0';
896 SRam.unused2 = '\0';
897 SRam.changed = '\0' ;
898 SRam.eeprom_type = '\0';
899 SRam.unused3 = '\0';
900 SRam.eeprom_bit_cl = '\0';
901 SRam.eeprom_bit_in = '\0';
902 SRam.eeprom_bit_out = '\0';
903 SRam.size = 0;
904}
905
906bool retro_load_game(const struct retro_game_info *info)
907{
908 enum media_type_e media_type;
909 static char carthw_path[256];
910 size_t i;
911
912 struct retro_input_descriptor desc[] = {
913 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "D-Pad Left" },
914 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "D-Pad Up" },
915 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "D-Pad Down" },
916 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
917 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
918 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "C" },
919 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "Y" },
920 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y, "A" },
921 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "X" },
922 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "Z" },
923 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,"Mode" },
924 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
925
926 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "D-Pad Left" },
927 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "D-Pad Up" },
928 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "D-Pad Down" },
929 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
930 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
931 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "C" },
932 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "Y" },
933 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y, "A" },
934 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "X" },
935 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "Z" },
936 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,"Mode" },
937 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
938
939 { 0 },
940 };
941
942 struct retro_input_descriptor desc_sms[] = {
943 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "D-Pad Left" },
944 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "D-Pad Up" },
945 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "D-Pad Down" },
946 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
947 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "Button 1 Start" },
948 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "Button 2" },
949 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Button Pause" },
950
951 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "D-Pad Left" },
952 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "D-Pad Up" },
953 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "D-Pad Down" },
954 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
955 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "Button 1 Start" },
956 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "Button 2" },
957 { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Button Pause" },
958
959 { 0 },
960 };
961
962 sram_reset();
963
964 enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_RGB565;
965 if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt)) {
966 if (log_cb)
967 log_cb(RETRO_LOG_ERROR, "RGB565 support required, sorry\n");
968 return false;
969 }
970
971 if (info == NULL || info->path == NULL) {
972 if (log_cb)
973 log_cb(RETRO_LOG_ERROR, "info->path required\n");
974 return false;
975 }
976
977 for (i = 0; i < sizeof(disks) / sizeof(disks[0]); i++) {
978 if (disks[i].fname != NULL) {
979 free(disks[i].fname);
980 disks[i].fname = NULL;
981 }
982 }
983
984 disk_current_index = 0;
985 disk_count = 1;
986 disks[0].fname = strdup(info->path);
987
988 make_system_path(carthw_path, sizeof(carthw_path), "carthw", ".cfg");
989
990 media_type = PicoLoadMedia(info->path, carthw_path,
991 find_bios, NULL);
992
993 switch (media_type) {
994 case PM_BAD_DETECT:
995 if (log_cb)
996 log_cb(RETRO_LOG_ERROR, "Failed to detect ROM/CD image type.\n");
997 return false;
998 case PM_BAD_CD:
999 if (log_cb)
1000 log_cb(RETRO_LOG_ERROR, "Invalid CD image\n");
1001 return false;
1002 case PM_BAD_CD_NO_BIOS:
1003 if (log_cb)
1004 log_cb(RETRO_LOG_ERROR, "Missing BIOS\n");
1005 return false;
1006 case PM_ERROR:
1007 if (log_cb)
1008 log_cb(RETRO_LOG_ERROR, "Load error\n");
1009 return false;
1010 default:
1011 break;
1012 }
1013
1014 if (media_type == PM_MARK3)
1015 environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc_sms);
1016 else
1017 environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc);
1018
1019 PicoLoopPrepare();
1020
1021 PicoWriteSound = snd_write;
1022 memset(sndBuffer, 0, sizeof(sndBuffer));
1023 PsndOut = sndBuffer;
1024 PsndRerate(0);
1025
1026 return true;
1027}
1028
1029bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info)
1030{
1031 return false;
1032}
1033
1034void retro_unload_game(void)
1035{
1036}
1037
1038unsigned retro_get_region(void)
1039{
1040 return Pico.m.pal ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
1041}
1042
1043void *retro_get_memory_data(unsigned type)
1044{
1045 uint8_t* data;
1046
1047 switch(type)
1048 {
1049 case RETRO_MEMORY_SAVE_RAM:
1050 if (PicoAHW & PAHW_MCD)
1051 data = Pico_mcd->bram;
1052 else
1053 data = SRam.data;
1054 break;
1055 case RETRO_MEMORY_SYSTEM_RAM:
1056 if (PicoAHW & PAHW_SMS)
1057 data = Pico.vramb;
1058 else
1059 data = Pico.ram;
1060 break;
1061 default:
1062 data = NULL;
1063 break;
1064 }
1065
1066 return data;
1067}
1068
1069size_t retro_get_memory_size(unsigned type)
1070{
1071 unsigned int i;
1072 int sum;
1073
1074 switch(type)
1075 {
1076 case RETRO_MEMORY_SAVE_RAM:
1077 if (PicoAHW & PAHW_MCD)
1078 // bram
1079 return 0x2000;
1080
1081 if (Pico.m.frame_count == 0)
1082 return SRam.size;
1083
1084 // if game doesn't write to sram, don't report it to
1085 // libretro so that RA doesn't write out zeroed .srm
1086 for (i = 0, sum = 0; i < SRam.size; i++)
1087 sum |= SRam.data[i];
1088
1089 return (sum != 0) ? SRam.size : 0;
1090
1091 case RETRO_MEMORY_SYSTEM_RAM:
1092 if (PicoAHW & PAHW_SMS)
1093 return sizeof(Pico.vramb);
1094 else
1095 return sizeof(Pico.ram);
1096
1097 default:
1098 return 0;
1099 }
1100
1101}
1102
1103void retro_reset(void)
1104{
1105 PicoReset();
1106}
1107
1108static const unsigned short retro_pico_map[] = {
1109 1 << GBTN_B,
1110 1 << GBTN_A,
1111 1 << GBTN_MODE,
1112 1 << GBTN_START,
1113 1 << GBTN_UP,
1114 1 << GBTN_DOWN,
1115 1 << GBTN_LEFT,
1116 1 << GBTN_RIGHT,
1117 1 << GBTN_C,
1118 1 << GBTN_Y,
1119 1 << GBTN_X,
1120 1 << GBTN_Z,
1121};
1122#define RETRO_PICO_MAP_LEN (sizeof(retro_pico_map) / sizeof(retro_pico_map[0]))
1123
1124static void snd_write(int len)
1125{
1126 audio_batch_cb(PsndOut, len / 4);
1127}
1128
1129static enum input_device input_name_to_val(const char *name)
1130{
1131 if (strcmp(name, "3 button pad") == 0)
1132 return PICO_INPUT_PAD_3BTN;
1133 if (strcmp(name, "6 button pad") == 0)
1134 return PICO_INPUT_PAD_6BTN;
1135 if (strcmp(name, "None") == 0)
1136 return PICO_INPUT_NOTHING;
1137
1138 if (log_cb)
1139 log_cb(RETRO_LOG_WARN, "invalid picodrive_input: '%s'\n", name);
1140 return PICO_INPUT_PAD_3BTN;
1141}
1142
1143static void update_variables(void)
1144{
1145 struct retro_variable var;
1146
1147 var.value = NULL;
1148 var.key = "picodrive_input1";
1149 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
1150 PicoSetInputDevice(0, input_name_to_val(var.value));
1151
1152 var.value = NULL;
1153 var.key = "picodrive_input2";
1154 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
1155 PicoSetInputDevice(1, input_name_to_val(var.value));
1156
1157 var.value = NULL;
1158 var.key = "picodrive_sprlim";
1159 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1160 if (strcmp(var.value, "enabled") == 0)
1161 PicoOpt |= POPT_DIS_SPRITE_LIM;
1162 else
1163 PicoOpt &= ~POPT_DIS_SPRITE_LIM;
1164 }
1165
1166 var.value = NULL;
1167 var.key = "picodrive_ramcart";
1168 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1169 if (strcmp(var.value, "enabled") == 0)
1170 PicoOpt |= POPT_EN_MCD_RAMCART;
1171 else
1172 PicoOpt &= ~POPT_EN_MCD_RAMCART;
1173 }
1174
1175 int OldPicoRegionOverride = PicoRegionOverride;
1176 var.value = NULL;
1177 var.key = "picodrive_region";
1178 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1179 if (strcmp(var.value, "Auto") == 0)
1180 PicoRegionOverride = 0;
1181 else if (strcmp(var.value, "Japan NTSC") == 0)
1182 PicoRegionOverride = 1;
1183 else if (strcmp(var.value, "Japan PAL") == 0)
1184 PicoRegionOverride = 2;
1185 else if (strcmp(var.value, "US") == 0)
1186 PicoRegionOverride = 4;
1187 else if (strcmp(var.value, "Europe") == 0)
1188 PicoRegionOverride = 8;
1189 }
1190
1191 int OldPicoRegionFPSOverride = PicoRegionFPSOverride;
1192 var.value = NULL;
1193 var.key = "picodrive_region_fps";
1194 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1195 if (strcmp(var.value, "Auto") == 0)
1196 PicoRegionFPSOverride = 0;
1197 else if (strcmp(var.value, "NTSC") == 0)
1198 PicoRegionFPSOverride = 1;
1199 else if (strcmp(var.value, "PAL") == 0)
1200 PicoRegionFPSOverride = 2;
1201 }
1202
1203 // Update region, fps and sound flags if needed
1204 if (PicoRegionOverride != OldPicoRegionOverride ||
1205 PicoRegionFPSOverride != OldPicoRegionFPSOverride)
1206 {
1207 PicoDetectRegion();
1208 PicoLoopPrepare();
1209 PsndRerate(1);
1210 }
1211
1212 float old_user_vout_width = user_vout_width;
1213 var.value = NULL;
1214 var.key = "picodrive_aspect";
1215 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1216 if (strcmp(var.value, "4/3") == 0)
1217 user_vout_width = VOUT_4_3;
1218 else if (strcmp(var.value, "CRT") == 0)
1219 user_vout_width = VOUT_CRT;
1220 else
1221 user_vout_width = VOUT_PAR;
1222 }
1223
1224 var.value = NULL;
1225 var.key = "picodrive_overscan";
1226 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1227 if (strcmp(var.value, "enabled") == 0)
1228 show_overscan = true;
1229 else
1230 show_overscan = false;
1231 }
1232
1233 if (user_vout_width != old_user_vout_width)
1234 {
1235 // Update the geometry
1236 struct retro_system_av_info av_info;
1237 retro_get_system_av_info(&av_info);
1238 environ_cb(RETRO_ENVIRONMENT_SET_GEOMETRY, &av_info);
1239 }
1240
1241#ifdef DRC_SH2
1242 var.value = NULL;
1243 var.key = "picodrive_drc";
1244 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
1245 if (strcmp(var.value, "enabled") == 0)
1246 PicoOpt |= POPT_EN_DRC;
1247 else
1248 PicoOpt &= ~POPT_EN_DRC;
1249 }
1250#endif
1251#ifdef _3DS
1252 if(!ctr_svchack_successful)
1253 PicoOpt &= ~POPT_EN_DRC;
1254#endif
1255}
1256
1257void retro_run(void)
1258{
1259 bool updated = false;
1260 int pad, i;
1261
1262 if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
1263 update_variables();
1264
1265 input_poll_cb();
1266
1267 PicoPad[0] = PicoPad[1] = 0;
1268 for (pad = 0; pad < 2; pad++)
1269 for (i = 0; i < RETRO_PICO_MAP_LEN; i++)
1270 if (input_state_cb(pad, RETRO_DEVICE_JOYPAD, 0, i))
1271 PicoPad[pad] |= retro_pico_map[i];
1272
1273 PicoFrame();
1274
1275 video_cb((short *)vout_buf + vout_offset,
1276 vout_width, vout_height, vout_width * 2);
1277}
1278
1279static void check_system_specs(void)
1280{
1281 /* TODO - set different performance level for 32X - 6 for ARM dynarec, higher for interpreter core */
1282 unsigned level = 5;
1283 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
1284}
1285
1286void retro_init(void)
1287{
1288 struct retro_log_callback log;
1289 int level;
1290
1291 level = 0;
1292 environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
1293
1294 if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
1295 log_cb = log.log;
1296 else
1297 log_cb = NULL;
1298
1299 environ_cb(RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE, &disk_control);
1300
1301#ifdef _3DS
1302 ctr_svchack_successful = ctr_svchack_init();
1303#elif defined(VITA)
1304 sceBlock = getVMBlock();
1305#endif
1306
1307 PicoOpt = POPT_EN_STEREO|POPT_EN_FM|POPT_EN_PSG|POPT_EN_Z80
1308 | POPT_EN_MCD_PCM|POPT_EN_MCD_CDDA|POPT_EN_MCD_GFX
1309 | POPT_EN_32X|POPT_EN_PWM
1310 | POPT_ACC_SPRITES|POPT_DIS_32C_BORDER;
1311#ifdef __arm__
1312#ifdef _3DS
1313 if (ctr_svchack_successful)
1314#endif
1315 PicoOpt |= POPT_EN_DRC;
1316#endif
1317 PsndRate = 44100;
1318 PicoAutoRgnOrder = 0x184; // US, EU, JP
1319
1320 vout_width = 320;
1321 vout_height = 240;
1322#ifdef _3DS
1323 vout_buf = linearMemAlign(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2, 0x80);
1324#else
1325 vout_buf = malloc(VOUT_MAX_WIDTH * VOUT_MAX_HEIGHT * 2);
1326#endif
1327
1328 PicoInit();
1329 PicoDrawSetOutFormat(PDF_RGB555, 0);
1330 PicoDrawSetOutBuf(vout_buf, vout_width * 2);
1331
1332 //PicoMessage = plat_status_msg_busy_next;
1333 PicoMCDopenTray = disk_tray_open;
1334 PicoMCDcloseTray = disk_tray_close;
1335
1336 update_variables();
1337}
1338
1339void retro_deinit(void)
1340{
1341#ifdef _3DS
1342 linearFree(vout_buf);
1343#else
1344 free(vout_buf);
1345#endif
1346 vout_buf = NULL;
1347 PicoExit();
1348}
fast MegaDrive/MegaCD/32X emulator