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Switches to maximum-rate multiplexing. Hopefully to eliminate the mixer as a consideration for now.

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This commit is contained in:
Thomas Harte 2020-04-24 23:50:06 -04:00
parent 6d4e29c851
commit 6ebc93c995
2 changed files with 8 additions and 6 deletions
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12
Components/OPL2/OPL2.cpp
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@ -64,12 +64,12 @@ void OPLL::get_samples(std::size_t number_of_samples, std::int16_t *target) {
// unlike the OPL2 the OPLL time-divides the output for 'mixing'. // unlike the OPL2 the OPLL time-divides the output for 'mixing'.
const int update_period = 72 / audio_divider_; const int update_period = 72 / audio_divider_;
const int channel_output_period = 8 / audio_divider_; const int channel_output_period = 1;//2 / audio_divider_;
while(number_of_samples--) { while(number_of_samples--) {
if(!audio_offset_) update_all_chanels(); if(!audio_offset_) update_all_chanels();
*target = int16_t(channels_[audio_offset_ / channel_output_period].level); *target = int16_t(channels_[(audio_offset_ / channel_output_period) % 9].level);
++target; ++target;
audio_offset_ = (audio_offset_ + 1) % update_period; audio_offset_ = (audio_offset_ + 1) % update_period;
} }
@ -192,7 +192,9 @@ void OPLL::update_all_chanels() {
// Update the LFO. // Update the LFO.
oscillator_.update(); oscillator_.update();
// Channels that are updated for melodic output regardless. // Channels that are updated for melodic output regardless;
// in rhythm mode the final three channels — 6, 7, and 8 —
// are lost as their operators are used for drum noises.
for(int c = 0; c < 6; ++ c) { for(int c = 0; c < 6; ++ c) {
channels_[c].level = (channels_[c].update(oscillator_) * total_volume_) >> 11; channels_[c].level = (channels_[c].update(oscillator_) * total_volume_) >> 11;
} }
@ -200,8 +202,8 @@ void OPLL::update_all_chanels() {
if(depth_rhythm_control_ & 0x20) { if(depth_rhythm_control_ & 0x20) {
// Rhythm mode. Somehow? // Rhythm mode. Somehow?
} else { } else {
// All melody, all the time. // Not in rhythm mode; channels 7, 8 and 9 are melodic.
for(int c = 6; c < 9; ++ c) { for(int c = 7; c < 9; ++ c) {
channels_[c].level = (channels_[c].update(oscillator_) * total_volume_) >> 11; channels_[c].level = (channels_[c].update(oscillator_) * total_volume_) >> 11;
} }
} }

2
Machines/MasterSystem/MasterSystem.cpp
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@ -32,7 +32,7 @@
#include <iostream> #include <iostream>
namespace { namespace {
constexpr int audio_divider = 2; constexpr int audio_divider = 1;
} }
namespace Sega { namespace Sega {