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136 lines
2.8 KiB
C++
136 lines
2.8 KiB
C++
//
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// Mockingboard.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/02/2024.
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// Copyright © 2024 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "Card.hpp"
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#include "../../../Components/6522/6522.hpp"
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namespace Apple::II {
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class AYPair {
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public:
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AYPair(Concurrency::AsyncTaskQueue<false> &queue) :
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ays_{
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{GI::AY38910::Personality::AY38910, queue},
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{GI::AY38910::Personality::AY38910, queue},
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} {}
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void advance() {
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ays_[0].advance();
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ays_[1].advance();
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}
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void set_sample_volume_range(std::int16_t range) {
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ays_[0].set_sample_volume_range(range);
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ays_[1].set_sample_volume_range(range);
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}
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bool is_zero_level() const {
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return ays_[0].is_zero_level() && ays_[1].is_zero_level();
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}
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Outputs::Speaker::StereoSample level() const {
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Outputs::Speaker::StereoSample level;
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level.left = ays_[0].level();
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level.right = ays_[1].level();
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return level;
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}
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GI::AY38910::AY38910SampleSource<false> &get(int index) {
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return ays_[index];
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}
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private:
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GI::AY38910::AY38910SampleSource<false> ays_[2];
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};
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class Mockingboard: public Card {
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public:
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Mockingboard(AYPair &ays) :
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vias_{ {handlers_[0]}, {handlers_[1]} },
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handlers_{ {*this, ays.get(0)}, {*this, ays.get(1)}} {
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set_select_constraints(0);
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}
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void perform_bus_operation(Select select, bool is_read, uint16_t address, uint8_t *value) final {
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if(!(select & IO)) {
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return;
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}
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int index = (address >> 7) & 1;
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if(is_read) {
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*value = vias_[index].read(address);
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} else {
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vias_[index].write(address, *value);
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}
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}
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void run_for(Cycles cycles, int) final {
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vias_[0].run_for(cycles);
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vias_[1].run_for(cycles);
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}
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bool nmi() final {
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return handlers_[1].interrupt;
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}
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bool irq() final {
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return handlers_[0].interrupt;
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}
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void did_change_interrupt_flags() {
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delegate_->card_did_change_interrupt_flags(this);
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}
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private:
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struct AYVIA: public MOS::MOS6522::PortHandler {
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AYVIA(Mockingboard &card, GI::AY38910::AY38910SampleSource<false> &ay) :
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card(card), ay(ay) {}
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void set_interrupt_status(bool status) {
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interrupt = status;
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card.did_change_interrupt_flags();
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}
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void set_port_output(MOS::MOS6522::Port port, uint8_t value, uint8_t) {
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if(port) {
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using ControlLines = GI::AY38910::ControlLines;
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ay.set_control_lines(
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ControlLines(
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((value & 1) ? ControlLines::BC1 : 0) |
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((value & 2) ? ControlLines::BDIR : 0) |
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ControlLines::BC2
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)
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);
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ay.set_reset(!(value & 4));
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} else {
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ay.set_data_input(value);
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}
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}
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uint8_t get_port_input(MOS::MOS6522::Port port) {
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if(!port) {
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return ay.get_data_output();
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}
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return 0xff;
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}
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bool interrupt;
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Mockingboard &card;
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GI::AY38910::AY38910SampleSource<false> &ay;
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};
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MOS::MOS6522::MOS6522<AYVIA> vias_[2];
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AYVIA handlers_[2];
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};
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}
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