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Ensures rhythm instruments are installed.

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This commit is contained in:
Thomas Harte 2020-05-05 23:13:13 -04:00
parent 1a4321d7d0
commit 744211cec0
1 changed files with 20 additions and 2 deletions
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22
Components/OPL2/OPLL.cpp
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@ -53,7 +53,15 @@ void OPLL::write_register(uint8_t address, uint8_t value) {
// Register 0xe enables or disables rhythm mode and contains the
// percussion key-on bits.
if(address == 0xe) {
const bool old_rhythm_mode = rhythm_mode_enabled_;
rhythm_mode_enabled_ = value & 0x20;
if(old_rhythm_mode != rhythm_mode_enabled_) {
// Change the instlled instruments for channels 6, 7 and 8
// if this was a transition into or out of rhythm mode.
install_instrument(6);
install_instrument(7);
install_instrument(8);
}
rhythm_generators_[0].set_key_on(value & 0x01);
rhythm_generators_[1].set_key_on(value & 0x02);
rhythm_generators_[2].set_key_on(value & 0x04);
@ -106,7 +114,10 @@ void OPLL::write_register(uint8_t address, uint8_t value) {
case 0x30:
channels_[index].instrument = value >> 4;
channels_[index].attenuation = value >> 4;
install_instrument(index);
if(index < 6 || !rhythm_mode_enabled_) {
install_instrument(index);
}
return;
}
});
@ -141,7 +152,9 @@ void OPLL::install_instrument(int channel) {
auto &modulator_phase = phase_generators_[channel + 9];
auto &modulator_scaler = key_level_scalers_[channel + 9];
const uint8_t *const instrument = instrument_definition(channels_[channel].instrument);
const uint8_t *const instrument = ((channel < 6) || !rhythm_mode_enabled_) ?
instrument_definition(channels_[channel].instrument) :
&percussion_patch_set[(channel - 6) * 8];
// Bytes 0 (modulator) and 1 (carrier):
//
@ -264,6 +277,11 @@ void OPLL::update_all_channels() {
output_levels_[11] = VOLUME(melodic_output(5));
// TODO: drum noises. Also subject to proper channel population.
output_levels_[0] = output_levels_[1] = output_levels_[2] =
output_levels_[6] = output_levels_[7] = output_levels_[8] =
output_levels_[12] = output_levels_[13] = output_levels_[14] =
output_levels_[15] = output_levels_[16] = output_levels_[17] = 0;
} else {
for(int c = 6; c < 9; ++c) {
envelope_generators_[c + 0].update(oscillator_);