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Avoids over-greedy DMA.

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This commit is contained in:
Thomas Harte 2021-11-15 12:31:15 -05:00
parent c99dee86dd
commit 50a6496399
1 changed files with 15 additions and 6 deletions
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21
Machines/Amiga/Audio.cpp
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@ -20,14 +20,23 @@ using namespace Amiga;
bool Audio::advance_dma(int channel) { bool Audio::advance_dma(int channel) {
switch(channels_[channel].state) { switch(channels_[channel].state) {
case Channel::State::WaitingForDMA: case Channel::State::WaitingForDMA:
set_data(channel, ram_[pointer_[size_t(channel)]]); if(!channels_[channel].has_data) {
return true; set_data(channel, ram_[pointer_[size_t(channel)]]);
return true;
}
break;
case Channel::State::WaitingForDummyDMA: case Channel::State::WaitingForDummyDMA:
channels_[channel].has_data = true; if(!channels_[channel].has_data) {
return true; channels_[channel].has_data = true;
default: return true;
return false; }
break;
default: break;
} }
return false;
} }
void Audio::set_length(int channel, uint16_t length) { void Audio::set_length(int channel, uint16_t length) {