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112 lines
2.8 KiB
C++
112 lines
2.8 KiB
C++
//
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// 6560.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 05/06/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef _560_hpp
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#define _560_hpp
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#include "../../Outputs/CRT/CRT.hpp"
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#include "../../Outputs/Speaker.hpp"
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namespace MOS {
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/*!
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The 6560 is a video and audio output chip; it therefore vends both a @c CRT and a @c Speaker.
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To run the 6560 for a cycle, the caller should call @c get_address, make the requested bus access
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and call @c set_graphics_value with the result.
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@c set_register and @c get_register provide register access.
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*/
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class MOS6560 {
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public:
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MOS6560();
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Outputs::CRT::CRT *get_crt() { return _crt.get(); }
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Outputs::Speaker *get_speaker() { return &_speaker; }
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/*!
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Impliedly runs the 6560 for a single cycle, returning the next address that it puts on the bus.
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*/
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uint16_t get_address();
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/*!
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An owning machine should determine the state of the data bus as a result of the access implied
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by @c get_address and supply it to set_graphics_value.
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*/
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void set_graphics_value(uint8_t value, uint8_t colour_value);
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/*!
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Causes the 6560 to flush as much pending CRT and speaker communications as possible.
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*/
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inline void synchronise() { update_audio(); }
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/*!
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Writes to a 6560 register.
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*/
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void set_register(int address, uint8_t value);
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/*
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Reads from a 6560 register.
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*/
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uint8_t get_register(int address);
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private:
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std::unique_ptr<Outputs::CRT::CRT> _crt;
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class Speaker: public ::Outputs::Filter<Speaker> {
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public:
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Speaker();
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void set_volume(uint8_t volume);
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void set_control(int channel, uint8_t value);
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void get_samples(unsigned int number_of_samples, int16_t *target);
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void skip_samples(unsigned int number_of_samples);
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private:
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unsigned int _counters[4];
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unsigned int _shift_registers[4];
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uint8_t _control_registers[4];
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uint8_t _volume;
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} _speaker;
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bool _interlaced, _tall_characters;
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uint8_t _first_column_location, _first_row_location;
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uint8_t _number_of_columns, _number_of_rows;
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uint16_t _character_cell_start_address, _video_matrix_start_address;
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uint8_t _backgroundColour, _borderColour, _auxiliary_colour;
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bool _invertedCells;
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int _horizontal_counter, _vertical_counter;
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bool _did_output_graphics;
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int _column_counter, _row_counter;
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uint16_t _video_matrix_address_counter, _video_matrix_line_address_counter;
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enum State {
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Sync, ColourBurst, Border, Pixels
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} _this_state, _output_state;
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unsigned int _cycles_in_state;
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uint8_t _character_code, _character_colour, _character_value;
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uint8_t *pixel_pointer;
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uint8_t _registers[16];
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uint8_t _colours[16];
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bool _is_odd_frame;
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void output_border(unsigned int number_of_cycles);
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unsigned int _cycles_since_speaker_update;
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void update_audio();
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};
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}
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#endif /* _560_hpp */
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