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177 lines
4.4 KiB
C++
177 lines
4.4 KiB
C++
//
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// Atari2600.hpp
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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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#ifndef Atari2600_cpp
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#define Atari2600_cpp
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#include <stdint.h>
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#include "../../Processors/6502/CPU6502.hpp"
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#include "../CRTMachine.hpp"
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#include "PIA.hpp"
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#include "Speaker.hpp"
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#include "../ConfigurationTarget.hpp"
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#include "Atari2600Inputs.h"
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namespace Atari2600 {
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const unsigned int number_of_upcoming_events = 6;
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const unsigned int number_of_recorded_counters = 7;
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class Machine:
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public CPU6502::Processor<Machine>,
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public CRTMachine::Machine,
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public ConfigurationTarget::Machine {
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public:
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Machine();
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~Machine();
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void configure_as_target(const StaticAnalyser::Target &target);
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void switch_region();
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void set_digital_input(Atari2600DigitalInput input, bool state);
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void set_switch_is_enabled(Atari2600Switch input, bool state);
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// to satisfy CPU6502::Processor
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unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
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void synchronise();
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// to satisfy CRTMachine::Machine
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virtual void setup_output(float aspect_ratio);
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virtual void close_output();
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virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return crt_; }
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virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return speaker_; }
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virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }
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// TODO: different rate for PAL
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private:
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uint8_t *rom_, *rom_pages_[4];
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size_t rom_size_;
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// the RIOT
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PIA mos6532_;
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// playfield registers
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uint8_t playfield_control_;
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uint8_t playfield_colour_;
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uint8_t background_colour_;
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uint8_t playfield_[41];
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// ... and derivatives
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int ball_size_, missile_size_[2];
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// delayed clock events
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enum OutputState {
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Sync,
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Blank,
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ColourBurst,
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Pixel
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};
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struct Event {
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enum Action {
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Playfield = 1 << 0,
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ResetCounter = 1 << 1,
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HMoveSetup = 1 << 2,
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HMoveCompare = 1 << 3,
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HMoveDecrement = 1 << 4,
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};
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int updates;
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OutputState state;
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uint8_t playfield_pixel;
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int counter;
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Event() : updates(0), playfield_pixel(0) {}
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} upcoming_events_[number_of_upcoming_events];
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unsigned int upcoming_events_pointer_;
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// object counters
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struct ObjectCounter {
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int count; // the counter value, multiplied by four, counting phase
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int pixel; // for non-sprite objects, a count of cycles since the last counter reset; for sprite objects a count of pixels so far elapsed
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int broad_pixel; // for sprite objects, a count of cycles since the last counter reset; otherwise unused
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ObjectCounter() : count(0), pixel(0), broad_pixel(0) {}
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} object_counter_[number_of_recorded_counters][5];
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unsigned int object_counter_pointer_;
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// the latched playfield output
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uint8_t playfield_output_, next_playfield_output_;
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// player registers
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uint8_t player_colour_[2];
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uint8_t player_reflection_mask_[2];
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uint8_t player_graphics_[2][2];
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uint8_t player_graphics_selector_[2];
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// object flags
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bool has_second_copy_[2];
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bool has_third_copy_[2];
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bool has_fourth_copy_[2];
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uint8_t object_motions_[5]; // the value stored to this counter's motion register
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// player + missile registers
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uint8_t player_and_missile_size_[2];
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// missile registers
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uint8_t missile_graphics_enable_[2];
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bool missile_graphics_reset_[2];
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// ball registers
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uint8_t ball_graphics_enable_[2];
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uint8_t ball_graphics_selector_;
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// graphics output
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unsigned int horizontal_timer_;
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bool vsync_enabled_, vblank_enabled_;
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// horizontal motion control
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uint8_t hmove_counter_;
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uint8_t hmove_flags_;
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// joystick state
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uint8_t tia_input_value_[2];
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// collisions
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uint8_t collisions_[8];
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void output_pixels(unsigned int count);
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uint8_t get_output_pixel();
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void update_timers(int mask);
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// outputs
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std::shared_ptr<Outputs::CRT::CRT> crt_;
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std::shared_ptr<Speaker> speaker_;
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// current mode
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bool is_pal_region_;
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// speaker backlog accumlation counter
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unsigned int cycles_since_speaker_update_;
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void update_audio();
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// latched output state
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unsigned int last_output_state_duration_;
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OutputState state_by_extend_time_[2][57];
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OutputState *state_by_time_;
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OutputState last_output_state_;
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uint8_t *output_buffer_;
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// lookup table for collision reporting
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uint8_t reported_collisions_[64][8];
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void setup_reported_collisions();
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};
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}
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#endif /* Atari2600_cpp */
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