Mercurial > repos > blastem
view system.c @ 2005:3ce38692a3f2
Set initial pan bits in YM2612 register array and not just the separate lr field of the channel. This fixes an issue in which some channels would be silent in VGM log output
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 11 Oct 2020 22:42:10 -0700 |
parents | 81df9aa2de9b |
children | 3414a4423de1 |
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#include <string.h> #include "system.h" #include "genesis.h" #include "gen_player.h" #include "sms.h" uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) { long len = strlen(str); return filesize >= offset+len && !memcmp(str, buffer + offset, len); } system_type detect_system_type(system_media *media) { if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { //TODO: Differentiate between vanilla Genesis and Sega CD/32X games return SYSTEM_GENESIS; } if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) ) { return SYSTEM_SMS; } if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) { uint8_t *buffer = media->buffer; if (media->size > 9 && buffer[7] == 0) { return buffer[8] + 1; } } //TODO: Detect Jaguar ROMs here //Header based detection failed, examine filename for clues if (media->extension) { if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { return SYSTEM_GENESIS; } if (!strcmp("sms", media->extension)) { return SYSTEM_SMS; } if (!strcmp("j64", media->extension)) { return SYSTEM_JAGUAR; } } //More certain checks failed, look for a valid 68K reset vector if (media->size >= 8) { char *rom = media->buffer; uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7]; if (!(reset & 1) && reset < media->size) { //we have a valid looking reset vector, assume it's a Genesis ROM return SYSTEM_GENESIS; } } return SYSTEM_UNKNOWN; } system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region) { void *lock_on = NULL; uint32_t lock_on_size = 0; if (media->chain) { lock_on = media->chain->buffer; lock_on_size = media->chain->size; } switch (stype) { case SYSTEM_GENESIS: return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; case SYSTEM_GENESIS_PLAYER: return &(alloc_config_gen_player(media->buffer, media->size))->header; #ifndef NO_Z80 case SYSTEM_SMS: return &(alloc_configure_sms(media, opts, force_region))->header; #endif default: return NULL; } } system_header *alloc_config_player(system_type stype, event_reader *reader) { switch(stype) { case SYSTEM_GENESIS: return &(alloc_config_gen_player_reader(reader))->header; } return NULL; } void system_request_exit(system_header *system, uint8_t force_release) { system->force_release = force_release; system->request_exit(system); }