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Add local data pointers.

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This commit is contained in:
Thomas Harte 2021-12-04 17:58:41 -05:00
parent bfc70a1b60
commit fdf2b9cd7b
2 changed files with 17 additions and 5 deletions
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12
Machines/Amiga/Audio.cpp
View File

@ -27,6 +27,7 @@ Audio::Audio(Chipset &chipset, uint16_t *ram, size_t word_size, float output_rat
}
speaker_.set_input_rate(output_rate);
speaker_.set_high_frequency_cutoff(7000.0f);
}
// MARK: - Exposed setters.
@ -76,9 +77,12 @@ bool Audio::advance_dma(int channel) {
return false;
}
set_data(channel, ram_[pointer_[size_t(channel) & ram_mask_]]);
if(channels_[channel].state != Channel::State::WaitingForDummyDMA) {
++pointer_[size_t(channel)];
set_data(channel, ram_[channels_[channel].data_address & ram_mask_]);
++channels_[channel].data_address;
if(channels_[channel].should_reload_address) {
channels_[channel].data_address = pointer_[size_t(channel)];
channels_[channel].should_reload_address = false;
}
return true;
@ -345,6 +349,7 @@ template <> bool Audio::Channel::transit<
data_latch = data; // i.e. pbufld1
wants_data = true;
period_counter = period; // i.e. percntrld
should_reload_address = true; // i.e. dmasen
// TODO: volcntrld (see above).
// Request an interrupt.
@ -447,6 +452,7 @@ template <> bool Audio::Channel::transit<
if(!length_counter) {
length_counter = length;
will_request_interrupt = true;
should_reload_address = true; // ???
}
}

6
Machines/Amiga/Audio.hpp
View File

@ -70,6 +70,12 @@ class Audio: public DMADevice<4> {
bool wants_data = false;
uint16_t data_latch = 0x0000;
// The DMA address; unlike most of the Amiga Chipset,
// the user posts a value to feed a pointer, rather
// than having access to the pointer itself.
bool should_reload_address = false;
uint32_t data_address = 0x0000'0000;
// Number of words remaining in DMA data.
uint16_t length = 0;
uint16_t length_counter = 0;