CLK/Machines/Oric/Oric.hpp

//
//  Oric.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 11/10/2016.
//  Copyright © 2016 Thomas Harte. All rights reserved.
//

#ifndef Oric_hpp
#define Oric_hpp

#include "../../Processors/6502/CPU6502.hpp"
#include "../../Components/6522/6522.hpp"
#include "../../Components/AY38910/AY38910.hpp"
#include "../../Storage/Tape/Tape.hpp"

#include "../ConfigurationTarget.hpp"
#include "../CRTMachine.hpp"
#include "../Typer.hpp"

#include "Video.hpp"

#include <cstdint>
#include <vector>
#include <memory>

namespace Oric {

enum Key: uint16_t {
	Key3			= 0x0000 | 0x80,	KeyX			= 0x0000 | 0x40,	Key1			= 0x0000 | 0x20,
	KeyV			= 0x0000 | 0x08,	Key5			= 0x0000 | 0x04,	KeyN			= 0x0000 | 0x02,	Key7			= 0x0000 | 0x01,
	KeyD			= 0x0100 | 0x80,	KeyQ			= 0x0100 | 0x40,	KeyEscape		= 0x0100 | 0x20,
	KeyF			= 0x0100 | 0x08,	KeyR			= 0x0100 | 0x04,	KeyT			= 0x0100 | 0x02,	KeyJ			= 0x0100 | 0x01,
	KeyC			= 0x0200 | 0x80,	Key2			= 0x0200 | 0x40,	KeyZ			= 0x0200 | 0x20,	KeyControl		= 0x0200 | 0x10,
	Key4			= 0x0200 | 0x08,	KeyB			= 0x0200 | 0x04,	Key6			= 0x0200 | 0x02,	KeyM			= 0x0200 | 0x01,
	KeyQuote		= 0x0300 | 0x80,	KeyBackSlash	= 0x0300 | 0x40,
	KeyMinus		= 0x0300 | 0x08,	KeySemiColon	= 0x0300 | 0x04,	Key9			= 0x0300 | 0x02,	KeyK			= 0x0300 | 0x01,
	KeyRight		= 0x0400 | 0x80,	KeyDown			= 0x0400 | 0x40,	KeyLeft			= 0x0400 | 0x20,	KeyLeftShift	= 0x0400 | 0x10,
	KeyUp			= 0x0400 | 0x08,	KeyFullStop		= 0x0400 | 0x04,	KeyComma		= 0x0400 | 0x02,	KeySpace		= 0x0400 | 0x01,
	KeyOpenSquare	= 0x0500 | 0x80,	KeyCloseSquare	= 0x0500 | 0x40,	KeyDelete		= 0x0500 | 0x20,	KeyFunction		= 0x0500 | 0x10,
	KeyP			= 0x0500 | 0x08,	KeyO			= 0x0500 | 0x04,	KeyI			= 0x0500 | 0x02,	KeyU			= 0x0500 | 0x01,
	KeyW			= 0x0600 | 0x80,	KeyS			= 0x0600 | 0x40,	KeyA			= 0x0600 | 0x20,
	KeyE			= 0x0600 | 0x08,	KeyG			= 0x0600 | 0x04,	KeyH			= 0x0600 | 0x02,	KeyY			= 0x0600 | 0x01,
	KeyEquals		= 0x0700 | 0x80,										KeyReturn		= 0x0700 | 0x20,	KeyRightShift	= 0x0700 | 0x10,
	KeyForwardSlash	= 0x0700 | 0x08,	Key0			= 0x0700 | 0x04,	KeyL			= 0x0700 | 0x02,	Key8			= 0x0700 | 0x01,

	KeyNMI			= 0xffff,
};

class Machine:
	public CPU6502::Processor<Machine>,
	public CRTMachine::Machine,
	public ConfigurationTarget::Machine,
	public MOS::MOS6522IRQDelegate::Delegate {

	public:
		Machine();

		void set_rom(std::vector<uint8_t> data);
		void set_key_state(Key key, bool isPressed);
		void clear_all_keys();

		// to satisfy ConfigurationTarget::Machine
		void configure_as_target(const StaticAnalyser::Target &target);

		// to satisfy CPU6502::Processor
		unsigned int perform_bus_operation(CPU6502::BusOperation operation, uint16_t address, uint8_t *value);
		void synchronise();

		// to satisfy CRTMachine::Machine
		virtual void setup_output(float aspect_ratio);
		virtual void close_output();
		virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return _videoOutput->get_crt(); }
		virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return _via.ay8910; }
		virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }

		// to satisfy MOS::MOS6522IRQDelegate::Delegate
		void mos6522_did_change_interrupt_status(void *mos6522);

	private:
		// RAM and ROM
		uint8_t _ram[65536], _rom[16384];
		int _cycles_since_video_update;
		inline void update_video();

		// Outputs
		std::unique_ptr<VideoOutput> _videoOutput;

		//
		class Keyboard {
			public:
				uint8_t row;
				uint8_t rows[8];
		};
		class VIA: public MOS::MOS6522<VIA>, public MOS::MOS6522IRQDelegate {
			public:
				using MOS6522IRQDelegate::set_interrupt_status;

				void set_control_line_output(Port port, Line line, bool value)
				{
					if(line)
					{
						if(port) _ay_bdir = value; else _ay_bc1 = value;
						update_ay();
					}
				}

				void set_port_output(Port port, uint8_t value, uint8_t direction_mask) {
					if(port)
					{
						keyboard->row = value;
					}
					else
					{
						_port_a_output = value;
						update_ay();
					}
				}

				uint8_t get_port_input(Port port) {
					if(port)
					{
						uint8_t column = ay8910->get_port_output(false) ^ 0xff;
						return (keyboard->rows[keyboard->row & 7] & column) ? 0x08 : 0x00;
					}
					else
					{
						return _port_a_input;
					}
				}

				inline void run_for_half_cycles(unsigned int number_of_cycles)
				{
					_half_cycles_since_ay_update += number_of_cycles;
					MOS::MOS6522<VIA>::run_for_half_cycles(number_of_cycles);
				}

				std::shared_ptr<GI::AY38910> ay8910;
				std::shared_ptr<Keyboard> keyboard;

				inline void synchronise() { update_ay(); }

			private:
				void update_ay()
				{
					ay8910->run_for_cycles(_half_cycles_since_ay_update >> 1);
					_half_cycles_since_ay_update &= 1;
					if(_ay_bdir)
					{
						if(_ay_bc1) ay8910->select_register(_port_a_output);
						else ay8910->set_register_value(_port_a_output);
					}
					else
					{
						if(_ay_bc1) _port_a_input = ay8910->get_register_value();
					}
				}
				uint8_t _port_a_output, _port_a_input;
				bool _ay_bdir, _ay_bc1;
				unsigned int _half_cycles_since_ay_update;
		};
		VIA _via;
		std::shared_ptr<Keyboard> _keyboard;
};

}
#endif /* Oric_hpp */