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Disables low low-pass filter, honours audio control bits for better volume usage.

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This commit is contained in:
Thomas Harte 2020-04-21 19:57:13 -04:00
parent bdce1c464a
commit 0ac99e8d42
1 changed files with 31 additions and 4 deletions
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35
Machines/MasterSystem/MasterSystem.cpp
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@ -159,8 +159,11 @@ class ConcreteMachine:
map(write_pointers_, ram_, 1024, 0xc000, 0x10000);
}
// Apple a relatively low low-pass filter. More guidance needed here.
speaker_.set_high_frequency_cutoff(8000);
// Apply a relatively low low-pass filter. More guidance needed here.
// speaker_.set_high_frequency_cutoff(8000);
// Set default mixer levels: FM off, SN full-throttle.
set_mixer_levels(0);
keyboard_.set_delegate(this);
}
@ -325,9 +328,8 @@ class ConcreteMachine:
opll_.write(address, *cycle.value);
break;
case 0xf2:
// TODO: it turns out this address isn't just a detection space;
// it's actually an audio control. See https://www.smspower.org/Development/AudioControlPort
opll_detection_word_ = *cycle.value;
set_mixer_levels(opll_detection_word_);
break;
}
}
@ -447,6 +449,31 @@ class ConcreteMachine:
speaker_.run_for(audio_queue_, time_since_sn76489_update_.divide_cycles(Cycles(audio_divider)));
}
void set_mixer_levels(uint8_t mode) {
// This is as per the audio control register;
// see https://www.smspower.org/Development/AudioControlPort
update_audio();
audio_queue_.defer([this, mode] {
switch(mode & 3) {
case 0: // SN76489 only; the default.
mixer_.set_relative_volumes({1.0f, 0.0f});
break;
case 1: // FM only.
mixer_.set_relative_volumes({0.0f, 1.0f});
break;
case 2: // No audio.
mixer_.set_relative_volumes({0.0f, 0.0f});
break;
case 3: // Both FM and SN76489.
mixer_.set_relative_volumes({0.5f, 0.5f});
break;
}
});
}
using Target = Analyser::Static::Sega::Target;
Target::Model model_;
Target::Region region_;