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annotate system.c @ 1971:80920c21bb52

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Add an event log soft flush and call it twice per frame in between hard flushes to netplay latency when there are insufficient hardware updates to flush packets in the middle of a frame
author Michael Pavone <pavone@retrodev.com>
date Fri, 08 May 2020 11:40:30 -0700
parents c3c62dbf1ceb
children 81df9aa2de9b
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1 #include <string.h>
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2 #include "system.h"
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3 #include "genesis.h"
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4 #include "gen_player.h"
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5 #include "sms.h"
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6
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7 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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8 {
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9 long len = strlen(str);
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10 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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11 }
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12
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13 system_type detect_system_type(system_media *media)
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14 {
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15 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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16 //TODO: Differentiate between vanilla Genesis and Sega CD/32X games
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17 return SYSTEM_GENESIS;
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18 }
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19 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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20 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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21 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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22 ) {
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23 return SYSTEM_SMS;
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24 }
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25 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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26 uint8_t *buffer = media->buffer;
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27 if (media->size > 9 && buffer[7] == 0) {
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28 return buffer[8] + 1;
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29 }
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30 }
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31
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32
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33 //TODO: Detect Jaguar ROMs here
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34
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35 //Header based detection failed, examine filename for clues
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36 if (media->extension) {
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37 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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38 return SYSTEM_GENESIS;
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39 }
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40 if (!strcmp("sms", media->extension)) {
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41 return SYSTEM_SMS;
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42 }
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43 if (!strcmp("j64", media->extension)) {
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44 return SYSTEM_JAGUAR;
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45 }
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46 }
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47
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48 //More certain checks failed, look for a valid 68K reset vector
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49 if (media->size >= 8) {
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50 char *rom = media->buffer;
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51 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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52 if (!(reset & 1) && reset < media->size) {
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53 //we have a valid looking reset vector, assume it's a Genesis ROM
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54 return SYSTEM_GENESIS;
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55 }
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56 }
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57 return SYSTEM_UNKNOWN;
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58 }
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59
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60 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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61 {
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62 void *lock_on = NULL;
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63 uint32_t lock_on_size = 0;
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64 if (media->chain) {
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65 lock_on = media->chain->buffer;
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66 lock_on_size = media->chain->size;
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67 }
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68 switch (stype)
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69 {
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70 case SYSTEM_GENESIS:
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71 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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72 case SYSTEM_GENESIS_PLAYER:
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73 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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74 #ifndef NO_Z80
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75 case SYSTEM_SMS:
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76 return &(alloc_configure_sms(media, opts, force_region))->header;
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77 #endif
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78 default:
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79 return NULL;
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80 }
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81 }
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82
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83 system_header *alloc_config_player(system_type stype, event_reader *reader)
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84 {
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85 switch(stype)
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86 {
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87 case SYSTEM_GENESIS:
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88 return &(alloc_config_gen_player_reader(reader))->header;
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89 }
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90 return NULL;
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91 }