Mercurial > repos > blastem
diff genesis.c @ 1798:5278b6e44fc1
Optionally emulate the offset around zero in the imperfect DAC of a discrete YM2612
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Sun, 24 Mar 2019 19:59:41 -0700 |
| parents | 51417bb557b6 |
| children | 49f65d240299 ef3d368d59b0 |
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--- a/genesis.c Sun Mar 24 13:31:22 2019 -0700 +++ b/genesis.c Sun Mar 24 19:59:41 2019 -0700 @@ -1334,20 +1334,23 @@ io_keyboard_up(&gen->io, scancode); } -static void set_gain_config(genesis_context *gen) +static void set_audio_config(genesis_context *gen) { char *config_gain; config_gain = tern_find_path(config, "audio\0psg_gain\0", TVAL_PTR).ptrval; render_audio_source_gaindb(gen->psg->audio, config_gain ? atof(config_gain) : 0.0f); config_gain = tern_find_path(config, "audio\0fm_gain\0", TVAL_PTR).ptrval; render_audio_source_gaindb(gen->ym->audio, config_gain ? atof(config_gain) : 0.0f); + + char *config_dac = tern_find_path_default(config, "audio\0fm_dac\0", (tern_val){.ptrval="zero_offset"}, TVAL_PTR).ptrval; + ym_enable_zero_offset(gen->ym, !strcmp(config_dac, "zero_offset")); } static void config_updated(system_header *system) { genesis_context *gen = (genesis_context *)system; setup_io_devices(config, &system->info, &gen->io); - set_gain_config(gen); + set_audio_config(gen); } genesis_context *alloc_init_genesis(rom_info *rom, void *main_rom, void *lock_on, uint32_t system_opts, uint8_t force_region) @@ -1402,7 +1405,7 @@ gen->psg = malloc(sizeof(psg_context)); psg_init(gen->psg, gen->master_clock, MCLKS_PER_PSG); - set_gain_config(gen); + set_audio_config(gen); z80_map[0].buffer = gen->zram = calloc(1, Z80_RAM_BYTES); #ifndef NO_Z80