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Attempts to complete OPL2 register decoding.

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This commit is contained in:
Thomas Harte 2020-04-04 23:39:09 -04:00
parent 84cdf6130f
commit 335a68396f
2 changed files with 33 additions and 2 deletions
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26
Components/OPL2/OPL2.cpp
View File

@ -36,7 +36,7 @@ namespace {
Registers 4 and 5, i.e. decay and attack rate, modulator and carrier.
Bytes 7, 8:
Registers 6 and 6, i.e. decay-sustain level and release rate, modulator and carrier.
Registers 6 and 7, i.e. decay-sustain level and release rate, modulator and carrier.
*/
@ -134,6 +134,16 @@ uint8_t OPL2::read(uint16_t address) {
void OPL2::set_opl2_register(uint8_t location, uint8_t value) {
printf("OPL2 write: %02x to %d\n", value, selected_register_);
// Deal with timer changes synchronously.
switch(location) {
case 0x02: timers_[0] = value; return;
case 0x03: timers_[1] = value; return;
case 0x04: timer_control_ = value; return;
default: break;
}
// Enqueue any changes that affect audio output.
task_queue_.enqueue([this, location, value] {
//
@ -149,7 +159,7 @@ void OPL2::set_opl2_register(uint8_t location, uint8_t value) {
return;
}
if(location >= 0x50 && location <= 0x55) {
if(location >= 0x40 && location <= 0x55) {
operators_[location - 0x40].scaling_level = value >> 6;
operators_[location - 0x40].output_level = value & 0x3f;
return;
@ -194,5 +204,17 @@ void OPL2::set_opl2_register(uint8_t location, uint8_t value) {
channels_[location - 0xc0].two_operator = value & 1;
return;
}
//
// Modal modifications.
//
switch(location) {
case 0x01: waveform_enable_ = value & 0x20; break;
case 0x08: csm_keyboard_split_ = value; break;
case 0xbd: depth_rhythm_control_ = value; break;
default: break;
}
});
}

9
Components/OPL2/OPL2.hpp
View File

@ -50,6 +50,7 @@ class OPL2: public ::Outputs::Speaker::SampleSource {
void set_opl2_register(uint8_t location, uint8_t value);
// Asynchronous properties, valid only on the audio thread.
struct Operator {
bool apply_amplitude_modulation = false;
bool apply_vibrato = false;
@ -72,6 +73,14 @@ class OPL2: public ::Outputs::Speaker::SampleSource {
int feedback_strength;
bool two_operator;
} channels_[9];
uint8_t depth_rhythm_control_;
uint8_t csm_keyboard_split_;
bool waveform_enable_;
// Synchronous properties, valid only on the emulation thread.
uint8_t timers_[2];
uint8_t timer_control_;
};
}