CLK/Machines/Amiga/Chipset.hpp

//
//  Chipset.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 22/07/2021.
//  Copyright © 2021 Thomas Harte. All rights reserved.
//

#ifndef Chipset_hpp
#define Chipset_hpp

#include <cstddef>
#include <cstdint>

#include "../../Processors/68000/68000.hpp"

#include "Blitter.hpp"

namespace Amiga {

class Chipset {
	public:
		Chipset(uint16_t *ram, size_t size);

		/// @returns The duration from now until the beginning of the next
		/// available CPU slot for accessing chip memory.
		HalfCycles time_until_cpu_slot();

		/// Advances the stated amount of time.
		void run_for(HalfCycles);

		/// Performs the provided microcycle, which the caller guarantees to be a memory access.
		void perform(const CPU::MC68000::Microcycle &);

	private:
		// MARK: - Interrupts.

		uint16_t interrupt_enable_ = 0;
		uint16_t interrupt_requests_ = 0;

		void update_interrupts() {
			// TODO.
		}

		// MARK: - DMA Control and Blitter.

		uint16_t dma_control_ = 0;
		Blitter blitter_;

		// MARK: - Sprites.

		struct Sprite {
			void set_pointer(int shift, uint16_t value);
			void set_start_position(uint16_t value);
			void set_stop_and_control(uint16_t value);
			void set_image_data(int slot, uint16_t value);
		} sprites_[8];

		// MARK: - Raster.

		int x_ = 0, y_ = 0;
		int line_length_ = 227;

		uint16_t display_window_start_[2] = {0, 0};
		uint16_t display_window_stop_[2] = {0, 0};
		uint16_t fetch_window_[2] = {0, 0};
};

}

#endif /* Chipset_hpp */