aboutsummaryrefslogtreecommitdiff
path: root/libretro.c
blob: f2056b93d327cf1160b0fe80e823add1676f7cb3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
#include "copyright"

#include <stdio.h>

#include "snes9x.h"
#include "soundux.h"
#include "memmap.h"
#include "apu.h"
#include "cheats.h"
#include "display.h"
#include "gfx.h"
#include "cpuexec.h"
#include "spc7110.h"
#include "srtc.h"
#include "sa1.h"

#ifdef PSP
#include <pspkernel.h>
#include <pspgu.h>
#endif

#include <libretro.h>

#ifdef _3DS
void* linearMemAlign(size_t size, size_t alignment);
void linearFree(void* mem);
#endif

static retro_log_printf_t log_cb = NULL;
static retro_video_refresh_t video_cb = NULL;
static retro_input_poll_t poll_cb = NULL;
static retro_input_state_t input_cb = NULL;
static retro_audio_sample_batch_t audio_batch_cb = NULL;
static retro_environment_t environ_cb = NULL;
struct retro_perf_callback perf_cb;

char retro_save_directory[PATH_MAX];
char retro_base_name[PATH_MAX];

#ifdef _WIN32
char slash = '\\';
#else
char slash = '/';
#endif

static int32_t samples_per_frame = 0;
static int32_t samplerate = (((SNES_CLOCK_SPEED * 6) / (32 * ONE_APU_CYCLE)));

#ifdef PERF_TEST
#define RETRO_PERFORMANCE_INIT(name) \
   retro_perf_tick_t current_ticks;\
   static struct retro_perf_counter name = {#name};\
   if (!name.registered) perf_cb.perf_register(&(name));\
   current_ticks = name.total

#define RETRO_PERFORMANCE_START(name) perf_cb.perf_start(&(name))
#define RETRO_PERFORMANCE_STOP(name) \
   perf_cb.perf_stop(&(name));\
   current_ticks = name.total - current_ticks;
#else
#define RETRO_PERFORMANCE_INIT(name)
#define RETRO_PERFORMANCE_START(name)
#define RETRO_PERFORMANCE_STOP(name)
#endif

void retro_set_environment(retro_environment_t cb)
{
   struct retro_log_callback log;

   environ_cb = cb;

   if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
      log_cb = log.log;
   else
      log_cb = NULL;

   environ_cb(RETRO_ENVIRONMENT_GET_PERF_INTERFACE, &perf_cb);
}


void retro_set_video_refresh(retro_video_refresh_t cb)
{
   video_cb = cb;
}

void retro_set_audio_sample(retro_audio_sample_t cb)
{
}

void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb)
{
   audio_batch_cb = cb;
}

void retro_set_input_poll(retro_input_poll_t cb)
{
   poll_cb = cb;
}

void retro_set_input_state(retro_input_state_t cb)
{
   input_cb = cb;
}

void retro_set_controller_port_device(unsigned port, unsigned device) {}

unsigned retro_api_version()
{
   return RETRO_API_VERSION;
}

void S9xMessage(const char* message)
{
   #define MAX_MESSAGE_LEN (36 * 3)

   static char buffer [MAX_MESSAGE_LEN + 1];

   printf("%s\n", message);
   strncpy(buffer, message, MAX_MESSAGE_LEN);
   buffer [MAX_MESSAGE_LEN] = 0;
   S9xSetInfoString(buffer);
}

void S9xDeinitDisplay(void)
{
#ifdef DS2_DMA
   if (GFX.Screen_buffer) AlignedFree(GFX.Screen, PtrAdj.GFXScreen);
#elif defined(_3DS)
   if (GFX.Screen_buffer) linearFree(GFX.Screen_buffer);
#else
   if (GFX.Screen_buffer) free(GFX.Screen_buffer);
#endif
   if (GFX.SubScreen_buffer) free(GFX.SubScreen_buffer);
   if (GFX.ZBuffer_buffer) free(GFX.ZBuffer_buffer);
   if (GFX.SubZBuffer_buffer) free(GFX.SubZBuffer_buffer);

   GFX.Screen = NULL;
   GFX.Screen_buffer = NULL;
   GFX.SubScreen = NULL;
   GFX.SubScreen_buffer = NULL;
   GFX.ZBuffer = NULL;
   GFX.ZBuffer_buffer = NULL;
   GFX.SubZBuffer = NULL;
   GFX.SubZBuffer_buffer = NULL;
}

void S9xInitDisplay(void)
{
   int32_t h = IMAGE_HEIGHT;
   int32_t safety = 32;

   GFX.Pitch = IMAGE_WIDTH * 2;
#ifdef DS2_DMA
   GFX.Screen_buffer = (uint8_t *) AlignedMalloc(GFX.Pitch * h + safety, 32, &PtrAdj.GFXScreen);
#elif defined(_3DS)
   safety = 0x80;
   GFX.Screen_buffer = (uint8_t *) linearMemAlign(GFX.Pitch * h + safety, 0x80);
#else
   GFX.Screen_buffer = (uint8_t *) malloc(GFX.Pitch * h + safety);
#endif
   GFX.SubScreen_buffer = (uint8_t *) malloc(GFX.Pitch * h + safety);
   GFX.ZBuffer_buffer = (uint8_t *) malloc((GFX.Pitch >> 1) * h + safety);
   GFX.SubZBuffer_buffer = (uint8_t *) malloc((GFX.Pitch >> 1) * h + safety);

   GFX.Screen = GFX.Screen_buffer + safety;
   GFX.SubScreen = GFX.SubScreen_buffer + safety;
   GFX.ZBuffer = GFX.ZBuffer_buffer + safety;
   GFX.SubZBuffer = GFX.SubZBuffer_buffer + safety;

   GFX.Delta = (GFX.SubScreen - GFX.Screen) >> 1;
}

bool S9xInitUpdate()
{
   return (true);
}
#ifndef __WIN32__
void _makepath(char* path, const char* drive, const char* dir,
               const char* fname, const char* ext)
{
   if (dir && *dir)
   {
      strcpy(path, dir);
      strcat(path, "/");
   }
   else
      *path = 0;

   if (fname)
      strcat(path, fname);

   if (ext && *ext)
   {
      strcat(path, ".");
      strcat(path, ext);
   }
}

void _splitpath(const char* path, char* drive, char* dir, char* fname,
                char* ext)
{
   *drive = 0;

   char* slash = strrchr((char*)path, '/');
   if (!slash)
      slash = strrchr((char*)path, '\\');

   char* dot = strrchr((char*)path, '.');

   if (dot && slash && dot < slash)
      dot = NULL;

   if (!slash)
   {
      strcpy(dir, "");
      strcpy(fname, path);
      if (dot)
      {
         * (fname + (dot - path)) = 0;
         strcpy(ext, dot + 1);
      }
      else
         strcpy(ext, "");
   }
   else
   {
      strcpy(dir, path);
      * (dir + (slash - path)) = 0;
      strcpy(fname, slash + 1);
      if (dot)
      {
         * (fname + (dot - slash) - 1) = 0;
         strcpy(ext, dot + 1);
      }
      else
         strcpy(ext, "");
   }
}
#endif
const char* S9xGetFilename(const char* ex)
{
   static char filename [PATH_MAX + 1];
   char drive [_MAX_DRIVE + 1];
   char dir [_MAX_DIR + 1];
   char fname [_MAX_FNAME + 1];
   char ext [_MAX_EXT + 1];
   _splitpath(Memory.ROMFilename, drive, dir, fname, ext);
   _makepath(filename, drive, dir, fname, ex);

   return (filename);
}

void GetBaseName(const char* ex)
{
   char drive [_MAX_DRIVE + 1];
   char dir [_MAX_DIR + 1];
   char fname [_MAX_FNAME + 1];
   char ext [_MAX_EXT + 1];
   _splitpath(Memory.ROMFilename, drive, dir, fname, ext);
   snprintf(retro_base_name,sizeof(retro_base_name),"%s",fname);
}

void init_sfc_setting(void)
{
   memset(&Settings, 0, sizeof(Settings));
   Settings.JoystickEnabled = false;
   Settings.SoundPlaybackRate = samplerate;
   Settings.CyclesPercentage = 100;

   Settings.DisableSoundEcho = false;
   Settings.InterpolatedSound = true;
   Settings.APUEnabled = true;

   Settings.H_Max = SNES_CYCLES_PER_SCANLINE;
   Settings.SkipFrames = AUTO_FRAMERATE;
   Settings.ShutdownMaster = true;
   Settings.FrameTimePAL = 20000;
   Settings.FrameTimeNTSC = 16667;
   Settings.DisableMasterVolume = false;
   Settings.Mouse = true;
   Settings.SuperScope = true;
   Settings.MultiPlayer5 = true;
   Settings.ControllerOption = SNES_JOYPAD;

   Settings.Transparency = true;
   Settings.SupportHiRes = true;
#ifdef USE_BLARGG_APU
   Settings.SoundSync = false;
#endif
   Settings.ApplyCheats = true;
   Settings.StretchScreenshots = 1;

   Settings.HBlankStart = (256 * Settings.H_Max) / SNES_HCOUNTER_MAX;
}

#ifdef USE_BLARGG_APU
static void S9xAudioCallback()
{
   size_t avail;
   /* Just pick a big buffer. We won't use it all. */
   static int16_t audio_buf[0x20000];

   S9xFinalizeSamples();
   avail = S9xGetSampleCount();
   S9xMixSamples(audio_buf, avail);
   audio_batch_cb(audio_buf, avail >> 1);
}
#endif

void retro_init(void)
{
   struct retro_log_callback log;
   enum retro_pixel_format rgb565;
   static const struct retro_variable vars[] = {
      { "catsfc_VideoMode",   "Video Mode; auto|NTSC|PAL" },
      { NULL, NULL },
   };

   if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
      log_cb = log.log;
   else
      log_cb = NULL;

   rgb565 = RETRO_PIXEL_FORMAT_RGB565;
   if (environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &rgb565) && log_cb)
      log_cb(RETRO_LOG_INFO,
             "Frontend supports RGB565 - will use that instead of XRGB1555.\n");

   init_sfc_setting();
   S9xInitMemory();
   S9xInitAPU();
   S9xInitDisplay();
   S9xInitGFX();
#ifdef USE_BLARGG_APU
   S9xInitSound(1000, 0); //just give it a 1 second buffer
   S9xSetSamplesAvailableCallback(S9xAudioCallback);
#else
   S9xInitSound();
#endif
   environ_cb(RETRO_ENVIRONMENT_SET_VARIABLES, (void*)vars);
}

void retro_deinit(void)
{
   if (Settings.SPC7110)
      (*CleanUp7110)();

   S9xDeinitGFX();
   S9xDeinitDisplay();
   S9xDeinitAPU();
   S9xDeinitMemory();

#ifdef PERF_TEST
   perf_cb.perf_log();
#endif
}

uint32_t S9xReadJoypad(int32_t port)
{
   static const uint32_t snes_lut[] =
   {
      SNES_B_MASK,
      SNES_Y_MASK,
      SNES_SELECT_MASK,
      SNES_START_MASK,
      SNES_UP_MASK,
      SNES_DOWN_MASK,
      SNES_LEFT_MASK,
      SNES_RIGHT_MASK,
      SNES_A_MASK,
      SNES_X_MASK,
      SNES_TL_MASK,
      SNES_TR_MASK
   };

   int32_t i;
   uint32_t joypad = 0;

   for (i = RETRO_DEVICE_ID_JOYPAD_B; i <= RETRO_DEVICE_ID_JOYPAD_R; i++)
      if (input_cb(port, RETRO_DEVICE_JOYPAD, 0, i))
         joypad |= snes_lut[i];

   return joypad;
}

static void check_variables(void)
{
   struct retro_variable var;

   var.key = "catsfc_VideoMode";
   var.value = NULL;
   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
   {
      Settings.ForceNTSC = !strcmp(var.value, "NTSC");
      Settings.ForcePAL  = !strcmp(var.value, "PAL");
   }
}

#ifdef PSP
#define FRAMESKIP
#endif

static int32_t samples_to_play = 0;
void retro_run(void)
{
   bool updated = false;

   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
      check_variables();

#ifdef NO_VIDEO_OUTPUT
   video_cb(NULL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, GFX.Pitch);
   IPPU.RenderThisFrame = false;
#endif

   poll_cb();

   RETRO_PERFORMANCE_INIT(S9xMainLoop_func);
   RETRO_PERFORMANCE_START(S9xMainLoop_func);
   S9xMainLoop();
   RETRO_PERFORMANCE_STOP(S9xMainLoop_func);

#ifndef USE_BLARGG_APU
   static int16_t audio_buf[2048];

   samples_to_play += samples_per_frame;

   if (samples_to_play > 512)
   {
      S9xMixSamples(audio_buf, samples_to_play * 2);
      audio_batch_cb(audio_buf, samples_to_play);
      samples_to_play = 0;
   }
#endif

#ifdef NO_VIDEO_OUTPUT
   return;
#endif

#ifdef FRAMESKIP
   if (IPPU.RenderThisFrame)
   {
#endif

#ifdef PSP
      static unsigned int __attribute__((aligned(16))) d_list[32];
      void* const texture_vram_p = (void*)(0x44200000 - (512 *
                                           512)); // max VRAM address - frame size

      sceKernelDcacheWritebackRange(GFX.Screen,
                                    GFX.Pitch * IPPU.RenderedScreenHeight);

      sceGuStart(GU_DIRECT, d_list);

      sceGuCopyImage(GU_PSM_4444, 0, 0, IPPU.RenderedScreenWidth,
                     IPPU.RenderedScreenHeight, GFX.Pitch >> 1, GFX.Screen, 0,
                     0,
                     512, texture_vram_p);

      sceGuTexSync();
      sceGuTexImage(0, 512, 512, 512, texture_vram_p);
      sceGuTexMode(GU_PSM_5551, 0, 0, GU_FALSE);
      sceGuTexFunc(GU_TFX_REPLACE, GU_TCC_RGB);
      sceGuDisable(GU_BLEND);

      sceGuFinish();

      video_cb(texture_vram_p, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight,
               GFX.Pitch);
#else
      video_cb(GFX.Screen, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight,
               GFX.Pitch);
#endif

#ifdef FRAMESKIP
      IPPU.RenderThisFrame = false;
   }
   else
   {
      video_cb(NULL, IPPU.RenderedScreenWidth, IPPU.RenderedScreenHeight, GFX.Pitch);
      IPPU.RenderThisFrame = true;
   }
#endif
}

bool S9xReadMousePosition(int32_t which1, int32_t* x, int32_t* y, uint32_t* buttons)
{
   return (false);
}

bool S9xReadSuperScopePosition(int32_t* x, int32_t* y, uint32_t* buttons)
{
   return (true);
}

bool JustifierOffscreen()
{
   return (false);
}

void JustifierButtons(uint32_t* justifiers)
{
}

char* osd_GetPackDir()
{
   static char filename[_MAX_PATH];
   memset(filename, 0, _MAX_PATH);

   char dir [_MAX_DIR + 1];
   char drive [_MAX_DRIVE + 1];
   char name [_MAX_FNAME + 1];
   char ext [_MAX_EXT + 1];
   _splitpath(Memory.ROMFilename, drive, dir, name, ext);
   _makepath(filename, drive, dir, NULL, NULL);


   if (!strncmp((char*)&Memory.ROM [0xffc0], "SUPER POWER LEAG 4   ", 21))
   {
      if (getenv("SPL4PACK"))
         return getenv("SPL4PACK");
      else
         strcat(filename, "/SPL4-SP7");
   }
   else if (!strncmp((char*)&Memory.ROM [0xffc0], "MOMOTETSU HAPPY      ", 21))
   {
      if (getenv("MDHPACK"))
         return getenv("MDHPACK");
      else
         strcat(filename, "/SMHT-SP7");
   }
   else if (!strncmp((char*)&Memory.ROM [0xffc0], "HU TENGAI MAKYO ZERO ", 21))
   {
      if (getenv("FEOEZPACK"))
         return getenv("FEOEZPACK");
      else
         strcat(filename, "/FEOEZSP7");
   }
   else if (!strncmp((char*)&Memory.ROM [0xffc0], "JUMP TENGAIMAKYO ZERO", 21))
   {
      if (getenv("SJNSPACK"))
         return getenv("SJNSPACK");
      else
         strcat(filename, "/SJUMPSP7");
   }
   else strcat(filename, "/MISC-SP7");
   return filename;
}

unsigned retro_get_region(void)
{
   return Settings.PAL ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
}

void retro_get_system_info(struct retro_system_info* info)
{
#ifdef LOAD_FROM_MEMORY_TEST
   info->need_fullpath    = false;
#else
   info->need_fullpath    = true;
#endif
   info->valid_extensions = "smc|fig|sfc|gd3|gd7|dx2|bsx|swc";
#ifndef GIT_VERSION
#define GIT_VERSION ""
#endif
   info->library_version  = "v1.36" GIT_VERSION;
#ifdef USE_BLARGG_APU
   info->library_name     = "Snes9x 2005 Plus";
#else
   info->library_name     = "Snes9x 2005";
#endif
   info->block_extract    = false;
}

void retro_get_system_av_info(struct retro_system_av_info* info)
{
   info->geometry.base_width = 256;
   info->geometry.base_height = 224;
   info->geometry.max_width = 512;
   info->geometry.max_height = 512;
   info->geometry.aspect_ratio = 4.0 / 3.0;

   if (!Settings.PAL)
      info->timing.fps = (SNES_CLOCK_SPEED * 6.0 / (SNES_CYCLES_PER_SCANLINE *
                          SNES_MAX_NTSC_VCOUNTER));
   else
      info->timing.fps = (SNES_CLOCK_SPEED * 6.0 / (SNES_CYCLES_PER_SCANLINE *
                          SNES_MAX_PAL_VCOUNTER));

   info->timing.sample_rate = samplerate;
}

void retro_reset(void)
{
   CPU.Flags = 0;
   S9xReset();
}

size_t retro_serialize_size(void)
{
   return sizeof(CPU) + sizeof(ICPU) + sizeof(PPU) + sizeof(DMA) +
          0x10000 + 0x20000 + 0x20000 + 0x8000 +
#ifndef USE_BLARGG_APU
          sizeof(APU) + sizeof(IAPU) + 0x10000
#else
          SPC_SAVE_STATE_BLOCK_SIZE
#endif
          + sizeof(SA1) +
          sizeof(s7r) + sizeof(rtc_f9);
}

bool retro_serialize(void* data, size_t size)
{
   int32_t i;

   S9xUpdateRTC();
   S9xSRTCPreSaveState();
   uint8_t* buffer = data;
   memcpy(buffer, &CPU, sizeof(CPU));
   buffer += sizeof(CPU);
   memcpy(buffer, &ICPU, sizeof(ICPU));
   buffer += sizeof(ICPU);
   memcpy(buffer, &PPU, sizeof(PPU));
   buffer += sizeof(PPU);
   memcpy(buffer, &DMA, sizeof(DMA));
   buffer += sizeof(DMA);
   memcpy(buffer, Memory.VRAM, 0x10000);
   buffer += 0x10000;
   memcpy(buffer, Memory.RAM, 0x20000);
   buffer += 0x20000;
   memcpy(buffer, Memory.SRAM, 0x20000);
   buffer += 0x20000;
   memcpy(buffer, Memory.FillRAM, 0x8000);
   buffer += 0x8000;
#ifndef USE_BLARGG_APU
   memcpy(buffer, &APU, sizeof(APU));
   buffer += sizeof(APU);
   memcpy(buffer, &IAPU, sizeof(IAPU));
   buffer += sizeof(IAPU);
   memcpy(buffer, IAPU.RAM, 0x10000);
   buffer += 0x10000;
#else
   S9xAPUSaveState(buffer);
   buffer += SPC_SAVE_STATE_BLOCK_SIZE;
#endif

   SA1.Registers.PC = SA1.PC - SA1.PCBase;
   S9xSA1PackStatus();

   memcpy(buffer, &SA1, sizeof(SA1));
   buffer += sizeof(SA1);
   memcpy(buffer, &s7r, sizeof(s7r));
   buffer += sizeof(s7r);
   memcpy(buffer, &rtc_f9, sizeof(rtc_f9));

   return true;
}

bool retro_unserialize(const void* data, size_t size)
{
   const uint8_t* buffer = data;

   if (size != retro_serialize_size())
      return false;

   S9xReset();
#ifndef USE_BLARGG_APU
   uint8_t* IAPU_RAM_current = IAPU.RAM;
   uint32_t IAPU_RAM_offset;
#endif
   memcpy(&CPU, buffer, sizeof(CPU));
   buffer += sizeof(CPU);
   memcpy(&ICPU, buffer, sizeof(ICPU));
   buffer += sizeof(ICPU);
   memcpy(&PPU, buffer, sizeof(PPU));
   buffer += sizeof(PPU);
   memcpy(&DMA, buffer, sizeof(DMA));
   buffer += sizeof(DMA);
   memcpy(Memory.VRAM, buffer, 0x10000);
   buffer += 0x10000;
   memcpy(Memory.RAM, buffer, 0x20000);
   buffer += 0x20000;
   memcpy(Memory.SRAM, buffer, 0x20000);
   buffer += 0x20000;
   memcpy(Memory.FillRAM, buffer, 0x8000);
   buffer += 0x8000;
#ifndef USE_BLARGG_APU
   memcpy(&APU, buffer, sizeof(APU));
   buffer += sizeof(APU);
   memcpy(&IAPU, buffer, sizeof(IAPU));
   buffer += sizeof(IAPU);
   IAPU_RAM_offset = IAPU_RAM_current - IAPU.RAM;
   IAPU.PC += IAPU_RAM_offset;
   IAPU.DirectPage += IAPU_RAM_offset;
   IAPU.WaitAddress1 += IAPU_RAM_offset;
   IAPU.WaitAddress2 += IAPU_RAM_offset;
   IAPU.RAM = IAPU_RAM_current;
   memcpy(IAPU.RAM, buffer, 0x10000);
   buffer += 0x10000;
#else
   S9xAPULoadState(buffer);
   buffer += SPC_SAVE_STATE_BLOCK_SIZE;
#endif

   memcpy(&SA1, buffer, sizeof(SA1));
   buffer += sizeof(SA1);
   memcpy(&s7r, buffer, sizeof(s7r));
   buffer += sizeof(s7r);
   memcpy(&rtc_f9, buffer, sizeof(rtc_f9));

   S9xFixSA1AfterSnapshotLoad();
   FixROMSpeed();
   IPPU.ColorsChanged = true;
   IPPU.OBJChanged = true;
   CPU.InDMA = false;
   S9xFixColourBrightness();
   S9xSA1UnpackStatus();
#ifndef USE_BLARGG_APU
   S9xAPUUnpackStatus();
   S9xFixSoundAfterSnapshotLoad();
#endif
   ICPU.ShiftedPB = ICPU.Registers.PB << 16;
   ICPU.ShiftedDB = ICPU.Registers.DB << 16;
   S9xSetPCBase(ICPU.ShiftedPB + ICPU.Registers.PC);
   S9xUnpackStatus();
   S9xFixCycles();
   S9xReschedule();

   return true;
}

void retro_cheat_reset(void)
{
#ifdef WANT_CHEATS
   S9xDeleteCheats();
   S9xApplyCheats();
#endif
}

#ifdef WANT_CHEATS
extern SCheatData Cheat;
#endif

void retro_cheat_set(unsigned index, bool enabled, const char* code)
{
#ifdef WANT_CHEATS
   uint32_t address;
   uint8_t val;
   
   bool sram;
   uint8_t bytes[3];//used only by GoldFinger, ignored for now 
   
   if (S9xGameGenieToRaw(code, &address, &val)!=NULL &&
       S9xProActionReplayToRaw(code, &address, &val)!=NULL &&
       S9xGoldFingerToRaw(code, &address, &sram, &val, bytes)!=NULL)
   { // bad code, ignore
      return;
   }
   if (index > Cheat.num_cheats)
      return; // cheat added in weird order, ignore
   if (index == Cheat.num_cheats)
      Cheat.num_cheats++;
   
   Cheat.c[index].address = address;
   Cheat.c[index].byte = val;
   Cheat.c[index].enabled = enabled;
   
   Cheat.c[index].saved = false; // it'll be saved next time cheats run anyways
   
   Settings.ApplyCheats = true;
   S9xApplyCheats();
#endif
}

static void init_descriptors(void)
{
   struct retro_input_descriptor desc[] = {
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP,    "D-Pad Up" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN,  "D-Pad Down" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B,     "B" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A,     "A" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X,     "X" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y,     "Y" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L,     "L" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R,     "R" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,   "Select" },
      { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START,    "Start" },

      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP,    "D-Pad Up" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN,  "D-Pad Down" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B,     "B" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A,     "A" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X,     "X" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y,     "Y" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L,     "L" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R,     "R" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,   "Select" },
      { 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START,    "Start" },

      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP,    "D-Pad Up" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN,  "D-Pad Down" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B,     "B" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A,     "A" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X,     "X" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y,     "Y" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L,     "L" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R,     "R" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,   "Select" },
      { 2, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START,    "Start" },

      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP,    "D-Pad Up" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN,  "D-Pad Down" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B,     "B" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A,     "A" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X,     "X" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y,     "Y" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L,     "L" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R,     "R" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,   "Select" },
      { 3, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START,    "Start" },

      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT,  "D-Pad Left" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP,    "D-Pad Up" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN,  "D-Pad Down" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "D-Pad Right" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B,     "B" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A,     "A" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X,     "X" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y,     "Y" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L,     "L" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R,     "R" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT,   "Select" },
      { 4, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START,    "Start" },

      { 0 },
   };

   environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc);
}

bool retro_load_game(const struct retro_game_info* game)
{
   struct retro_system_av_info av_info;
   if (!game)
      return false;

   CPU.Flags = 0;
   init_descriptors();
   check_variables();

#ifdef LOAD_FROM_MEMORY_TEST
   if (!LoadROM(game))
#else
      if (!LoadROM(game->path))
#endif
         return false;

   Settings.FrameTime = (Settings.PAL ? Settings.FrameTimePAL :
         Settings.FrameTimeNTSC);

   retro_get_system_av_info(&av_info);

#ifdef USE_BLARGG_APU
   Settings.SoundPlaybackRate = av_info.timing.sample_rate;
#else
   samples_per_frame = av_info.timing.sample_rate / av_info.timing.fps;
   S9xSetPlaybackRate(Settings.SoundPlaybackRate);
#endif
   return true;
}

bool retro_load_game_special(unsigned game_type,
                             const struct retro_game_info* info, size_t num_info)
{
   return false;
}

void retro_unload_game(void)
{
}

void* retro_get_memory_data(unsigned type)
{
   uint8_t* data = NULL;

   switch(type)
   {
      case RETRO_MEMORY_SAVE_RAM:
         data = Memory.SRAM;
         break;
      case RETRO_MEMORY_SYSTEM_RAM:
         data = Memory.RAM;
         break;
      case RETRO_MEMORY_VIDEO_RAM:
         data = Memory.VRAM;
         break;
      default:
         break;
   }

   return data;
}

size_t retro_get_memory_size(unsigned type)
{
   uint32_t size;

   switch(type)
   {
      case RETRO_MEMORY_SAVE_RAM:
         size = (uint32_t) (Memory.SRAMSize ? (1 << (Memory.SRAMSize + 3)) * 128 : 0);
         if (size > 0x20000)
            size = 0x20000;
         break;
      case RETRO_MEMORY_RTC:
         size = (Settings.SRTC || Settings.SPC7110RTC) ? 20 : 0;
         break;
      case RETRO_MEMORY_SYSTEM_RAM:
         size = 128 * 1024;
         break;
      case RETRO_MEMORY_VIDEO_RAM:
         size = 64 * 1024;
         break;
      default:
         size = 0;
         break;
   }

   return size;
}