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96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
//
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// AY-3-8910.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/10/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef AY_3_8910_hpp
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#define AY_3_8910_hpp
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#include "../../Outputs/Speaker.hpp"
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namespace GI {
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/*!
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Provides emulation of an AY-3-8910 / YM2149, which is a three-channel sound chip with a
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noise generator and a volume envelope generator, which also provides two bidirectional
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interface ports.
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*/
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class AY38910: public ::Outputs::Filter<AY38910> {
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public:
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/// Creates a new AY38910.
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AY38910();
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/// Sets the clock rate at which this AY38910 will be run.
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void set_clock_rate(double clock_rate);
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enum ControlLines {
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BC1 = (1 << 0),
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BC2 = (1 << 1),
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BCDIR = (1 << 2)
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};
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/// Sets the value the AY would read from its data lines if it were not outputting.
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void set_data_input(uint8_t r);
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/// Gets the value that would appear on the data lines if only the AY is outputting.
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uint8_t get_data_output();
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/// Sets the
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void set_control_lines(ControlLines control_lines);
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/*!
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Gets the value that would appear on the requested interface port if it were in output mode.
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@parameter port_b @c true to get the value for Port B, @c false to get the value for Port A.
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*/
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uint8_t get_port_output(bool port_b);
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// to satisfy ::Outputs::Speaker (included via ::Outputs::Filter; not for public consumption
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void get_samples(unsigned int number_of_samples, int16_t *target);
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private:
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int _selected_register;
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uint8_t _registers[16], _output_registers[16];
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int _master_divider;
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int _tone_periods[3];
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int _tone_counters[3];
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int _tone_outputs[3];
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int _noise_period;
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int _noise_counter;
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int _noise_shift_register;
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int _noise_output;
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int _envelope_period;
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int _envelope_divider;
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int _envelope_position;
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int _envelope_shapes[16][32];
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int _envelope_overflow_masks[16];
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int _volumes[16];
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enum ControlState {
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Inactive,
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LatchAddress,
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Read,
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Write
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} _control_state;
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void select_register(uint8_t r);
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void set_register_value(uint8_t value);
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uint8_t get_register_value();
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uint8_t _data_input, _data_output;
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int16_t _output_volume;
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inline void evaluate_output_volume();
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};
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};
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#endif /* AY_3_8910_hpp */
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