diff options
| -rw-r--r-- | src/i_oplmusic.c | 59 |
1 files changed, 29 insertions, 30 deletions
diff --git a/src/i_oplmusic.c b/src/i_oplmusic.c index 433e78fa..9960d35d 100644 --- a/src/i_oplmusic.c +++ b/src/i_oplmusic.c @@ -515,46 +515,45 @@ static void SetVoiceInstrument(opl_voice_t *voice, static void SetVoiceVolume(opl_voice_t *voice, unsigned int volume) { genmidi_voice_t *opl_voice; + unsigned int midi_volume; unsigned int full_volume; - unsigned int op_volume; - unsigned int reg_volume; - + unsigned int car_volume; + unsigned int mod_volume; + voice->note_volume = volume; - + opl_voice = &voice->current_instr->voices[voice->current_instr_voice]; - + // Multiply note volume and channel volume to get the actual volume. - - full_volume = (volume_mapping_table[voice->note_volume] - * volume_mapping_table[voice->channel->volume] - * volume_mapping_table[current_music_volume]) / (127 * 127); - - // The volume of each instrument can be controlled via GENMIDI: - - op_volume = 0x3f - opl_voice->carrier.level; - + + midi_volume = 2 * (volume_mapping_table[(voice->channel->volume + * current_music_volume) / 127] + 1); + + full_volume = (volume_mapping_table[voice->note_volume] * midi_volume) >> 9; + // The volume value to use in the register: - - reg_volume = (op_volume * full_volume) / 128; - reg_volume = (0x3f - reg_volume) | opl_voice->carrier.scale; - + car_volume = 0x3f - full_volume; + // Update the volume register(s) if necessary. - - if (reg_volume != voice->reg_volume) + + if (car_volume != voice->reg_volume) { - voice->reg_volume = reg_volume; - - OPL_WriteRegister(OPL_REGS_LEVEL + voice->op2, reg_volume); - + voice->reg_volume = car_volume | (opl_voice->carrier.scale & 0xc0); + + OPL_WriteRegister(OPL_REGS_LEVEL + voice->op2, voice->reg_volume); + // If we are using non-modulated feedback mode, we must set the // volume for both voices. - // Note that the same register volume value is written for - // both voices, always calculated from the carrier's level - // value. - - if ((opl_voice->feedback & 0x01) != 0) + + if ((opl_voice->feedback & 0x01) != 0 && opl_voice->modulator.level != 0x3f) { - OPL_WriteRegister(OPL_REGS_LEVEL + voice->op1, reg_volume); + mod_volume = 0x3f - opl_voice->modulator.level; + if (mod_volume >= car_volume) + { + mod_volume = car_volume; + } + OPL_WriteRegister(OPL_REGS_LEVEL + voice->op1, + mod_volume | (opl_voice->modulator.scale & 0xc0)); } } } |