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CLK/Machines/Atari2600.hpp
2015-08-13 13:24:02 +01:00

94 lines
1.9 KiB
C++

//
// Atari2600.hpp
// CLK
//
// Created by Thomas Harte on 14/07/2015.
// Copyright © 2015 Thomas Harte. All rights reserved.
//
#ifndef Atari2600_cpp
#define Atari2600_cpp
#include "../Processors/6502/CPU6502.hpp"
#include "../Outputs/CRT.hpp"
#include <stdint.h>
namespace Atari2600 {
class Machine: public CPU6502::Processor<Machine> {
public:
Machine();
~Machine();
int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
void set_rom(size_t length, const uint8_t *data);
void switch_region();
Outputs::CRT *get_crt() { return _crt; }
private:
uint8_t *_rom, *_romPages[4], _ram[128];
size_t _rom_size;
uint64_t _timestamp;
// the timer
unsigned int _piaTimerValue;
unsigned int _piaTimerShift, _writtenPiaTimerShift;
uint8_t _piaTimerStatus;
// playfield registers
uint8_t _playfield[3], _playfieldControl;
uint8_t _playfieldColour;
uint8_t _backgroundColour;
// player registers
uint8_t _playerColour[2];
uint8_t _playerReflection[2];
uint8_t _playerGraphicsLatch[2], _playerGraphics[2];
uint8_t _playerGraphicsLatchEnable[2];
bool _playerStart[2];
// player + missile registers
uint8_t _playerAndMissileSize[2];
// missile registers
uint8_t _missileGraphicsEnable[2], _missileGraphicsReset[2];
// ball registers
uint8_t _ballGraphicsEnable, _ballGraphicsEnableLatch;
uint8_t _ballGraphicsEnableDelay;
// graphics output
int32_t _horizontalTimer;
bool _vSyncEnabled, _vBlankEnabled;
bool _vBlankExtend;
uint8_t _hMoveCounter, _hMoveFlags;
uint8_t _objectCounter[5], _objectMotion[5];
// collisions
uint8_t _collisions[8];
enum OutputState {
Sync,
Blank,
Pixel
};
void output_pixels(int count);
void get_output_pixel(uint8_t *pixel, int offset);
Outputs::CRT *_crt;
// latched output state
int _lastOutputStateDuration;
OutputState _lastOutputState;
uint8_t *_outputBuffer;
};
}
#endif /* Atari2600_cpp */