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250 lines
8.8 KiB
C++
250 lines
8.8 KiB
C++
//
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// Atari2600.cpp
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// CLK
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//
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// Created by Thomas Harte on 14/07/2015.
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// Copyright 2015 Thomas Harte. All rights reserved.
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//
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#include "Atari2600.hpp"
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#include <algorithm>
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#include <cstdio>
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#include "../../CRTMachine.hpp"
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#include "../../JoystickMachine.hpp"
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#include "../../../Analyser/Static/Atari2600/Target.hpp"
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#include "Cartridges/Atari8k.hpp"
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#include "Cartridges/Atari16k.hpp"
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#include "Cartridges/Atari32k.hpp"
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#include "Cartridges/ActivisionStack.hpp"
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#include "Cartridges/CBSRAMPlus.hpp"
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#include "Cartridges/CommaVid.hpp"
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#include "Cartridges/MegaBoy.hpp"
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#include "Cartridges/MNetwork.hpp"
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#include "Cartridges/ParkerBros.hpp"
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#include "Cartridges/Pitfall2.hpp"
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#include "Cartridges/Tigervision.hpp"
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#include "Cartridges/Unpaged.hpp"
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namespace {
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static const double NTSC_clock_rate = 1194720;
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static const double PAL_clock_rate = 1182298;
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}
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namespace Atari2600 {
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class Joystick: public Inputs::ConcreteJoystick {
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public:
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Joystick(Bus *bus, std::size_t shift, std::size_t fire_tia_input) :
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ConcreteJoystick({
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Input(Input::Up),
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Input(Input::Down),
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Input(Input::Left),
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Input(Input::Right),
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Input(Input::Fire)
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}),
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bus_(bus), shift_(shift), fire_tia_input_(fire_tia_input) {}
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void did_set_input(const Input &digital_input, bool is_active) override {
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switch(digital_input.type) {
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case Input::Up: bus_->mos6532_.update_port_input(0, 0x10 >> shift_, is_active); break;
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case Input::Down: bus_->mos6532_.update_port_input(0, 0x20 >> shift_, is_active); break;
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case Input::Left: bus_->mos6532_.update_port_input(0, 0x40 >> shift_, is_active); break;
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case Input::Right: bus_->mos6532_.update_port_input(0, 0x80 >> shift_, is_active); break;
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// TODO: latching
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case Input::Fire:
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if(is_active)
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bus_->tia_input_value_[fire_tia_input_] &= ~0x80;
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else
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bus_->tia_input_value_[fire_tia_input_] |= 0x80;
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break;
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default: break;
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}
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}
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private:
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Bus *bus_;
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std::size_t shift_, fire_tia_input_;
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};
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using Target = Analyser::Static::Atari2600::Target;
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class ConcreteMachine:
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public Machine,
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public CRTMachine::Machine,
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public JoystickMachine::Machine,
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public Outputs::CRT::Delegate {
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public:
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ConcreteMachine(const Target &target) {
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set_clock_rate(NTSC_clock_rate);
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const std::vector<uint8_t> &rom = target.media.cartridges.front()->get_segments().front().data;
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using PagingModel = Target::PagingModel;
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switch(target.paging_model) {
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case PagingModel::ActivisionStack: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::ActivisionStack>>(rom); break;
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case PagingModel::CBSRamPlus: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::CBSRAMPlus>>(rom); break;
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case PagingModel::CommaVid: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::CommaVid>>(rom); break;
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case PagingModel::MegaBoy: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::MegaBoy>>(rom); break;
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case PagingModel::MNetwork: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::MNetwork>>(rom); break;
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case PagingModel::None: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Unpaged>>(rom); break;
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case PagingModel::ParkerBros: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::ParkerBros>>(rom); break;
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case PagingModel::Pitfall2: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Pitfall2>>(rom); break;
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case PagingModel::Tigervision: bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Tigervision>>(rom); break;
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case PagingModel::Atari8k:
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if(target.uses_superchip) {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari8kSuperChip>>(rom);
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} else {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari8k>>(rom);
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}
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break;
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case PagingModel::Atari16k:
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if(target.uses_superchip) {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari16kSuperChip>>(rom);
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} else {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari16k>>(rom);
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}
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break;
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case PagingModel::Atari32k:
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if(target.uses_superchip) {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari32kSuperChip>>(rom);
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} else {
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bus_ = std::make_unique<Cartridge::Cartridge<Cartridge::Atari32k>>(rom);
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}
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break;
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}
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joysticks_.emplace_back(new Joystick(bus_.get(), 0, 0));
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joysticks_.emplace_back(new Joystick(bus_.get(), 4, 1));
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}
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const std::vector<std::unique_ptr<Inputs::Joystick>> &get_joysticks() override {
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return joysticks_;
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}
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void set_switch_is_enabled(Atari2600Switch input, bool state) override {
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switch(input) {
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case Atari2600SwitchReset: bus_->mos6532_.update_port_input(1, 0x01, state); break;
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case Atari2600SwitchSelect: bus_->mos6532_.update_port_input(1, 0x02, state); break;
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case Atari2600SwitchColour: bus_->mos6532_.update_port_input(1, 0x08, state); break;
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case Atari2600SwitchLeftPlayerDifficulty: bus_->mos6532_.update_port_input(1, 0x40, state); break;
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case Atari2600SwitchRightPlayerDifficulty: bus_->mos6532_.update_port_input(1, 0x80, state); break;
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}
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}
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bool get_switch_is_enabled(Atari2600Switch input) override {
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uint8_t port_input = bus_->mos6532_.get_port_input(1);
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switch(input) {
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case Atari2600SwitchReset: return !!(port_input & 0x01);
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case Atari2600SwitchSelect: return !!(port_input & 0x02);
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case Atari2600SwitchColour: return !!(port_input & 0x08);
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case Atari2600SwitchLeftPlayerDifficulty: return !!(port_input & 0x40);
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case Atari2600SwitchRightPlayerDifficulty: return !!(port_input & 0x80);
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default: return false;
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}
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}
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void set_reset_switch(bool state) override {
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bus_->set_reset_line(state);
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}
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// to satisfy CRTMachine::Machine
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void set_scan_target(Outputs::Display::ScanTarget *scan_target) override {
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bus_->speaker_.set_input_rate(static_cast<float>(get_clock_rate() / static_cast<double>(CPUTicksPerAudioTick)));
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bus_->tia_.set_crt_delegate(this);
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bus_->tia_.set_scan_target(scan_target);
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}
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Outputs::Display::ScanStatus get_scaled_scan_status() const final {
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return bus_->tia_.get_scaled_scan_status() / 3.0f;
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}
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Outputs::Speaker::Speaker *get_speaker() override {
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return &bus_->speaker_;
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}
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void run_for(const Cycles cycles) override {
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bus_->run_for(cycles);
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bus_->apply_confidence(confidence_counter_);
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}
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void flush() {
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bus_->flush();
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}
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// to satisfy Outputs::CRT::Delegate
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void crt_did_end_batch_of_frames(Outputs::CRT::CRT *crt, int number_of_frames, int number_of_unexpected_vertical_syncs) override {
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const std::size_t number_of_frame_records = sizeof(frame_records_) / sizeof(frame_records_[0]);
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frame_records_[frame_record_pointer_ % number_of_frame_records].number_of_frames = number_of_frames;
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frame_records_[frame_record_pointer_ % number_of_frame_records].number_of_unexpected_vertical_syncs = number_of_unexpected_vertical_syncs;
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frame_record_pointer_ ++;
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if(frame_record_pointer_ >= 6) {
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int total_number_of_frames = 0;
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int total_number_of_unexpected_vertical_syncs = 0;
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for(std::size_t c = 0; c < number_of_frame_records; c++) {
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total_number_of_frames += frame_records_[c].number_of_frames;
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total_number_of_unexpected_vertical_syncs += frame_records_[c].number_of_unexpected_vertical_syncs;
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}
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if(total_number_of_unexpected_vertical_syncs >= total_number_of_frames >> 1) {
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for(std::size_t c = 0; c < number_of_frame_records; c++) {
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frame_records_[c].number_of_frames = 0;
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frame_records_[c].number_of_unexpected_vertical_syncs = 0;
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}
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is_ntsc_ ^= true;
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double clock_rate;
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if(is_ntsc_) {
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clock_rate = NTSC_clock_rate;
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bus_->tia_.set_output_mode(TIA::OutputMode::NTSC);
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} else {
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clock_rate = PAL_clock_rate;
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bus_->tia_.set_output_mode(TIA::OutputMode::PAL);
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}
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bus_->speaker_.set_input_rate(static_cast<float>(clock_rate / static_cast<double>(CPUTicksPerAudioTick)));
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bus_->speaker_.set_high_frequency_cutoff(static_cast<float>(clock_rate / (static_cast<double>(CPUTicksPerAudioTick) * 2.0)));
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set_clock_rate(clock_rate);
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}
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}
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}
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float get_confidence() override {
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return confidence_counter_.get_confidence();
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}
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private:
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// the bus
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std::unique_ptr<Bus> bus_;
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// output frame rate tracker
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struct FrameRecord {
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int number_of_frames = 0;
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int number_of_unexpected_vertical_syncs = 0;
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} frame_records_[4];
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unsigned int frame_record_pointer_ = 0;
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bool is_ntsc_ = true;
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std::vector<std::unique_ptr<Inputs::Joystick>> joysticks_;
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// a confidence counter
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Analyser::Dynamic::ConfidenceCounter confidence_counter_;
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};
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}
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using namespace Atari2600;
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Machine *Machine::Atari2600(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
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const Target *const atari_target = dynamic_cast<const Target *>(target);
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return new Atari2600::ConcreteMachine(*atari_target);
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}
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Machine::~Machine() {}
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