mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-18 01:07:58 +00:00
96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
//
|
|
// AY-3-8910.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 14/10/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef AY_3_8910_hpp
|
|
#define AY_3_8910_hpp
|
|
|
|
#include "../../Outputs/Speaker.hpp"
|
|
|
|
namespace GI {
|
|
|
|
/*!
|
|
Provides emulation of an AY-3-8910 / YM2149, which is a three-channel sound chip with a
|
|
noise generator and a volume envelope generator, which also provides two bidirectional
|
|
interface ports.
|
|
*/
|
|
class AY38910: public ::Outputs::Filter<AY38910> {
|
|
public:
|
|
/// Creates a new AY38910.
|
|
AY38910();
|
|
|
|
/// Sets the clock rate at which this AY38910 will be run.
|
|
void set_clock_rate(double clock_rate);
|
|
|
|
enum ControlLines {
|
|
BC1 = (1 << 0),
|
|
BC2 = (1 << 1),
|
|
BCDIR = (1 << 2)
|
|
};
|
|
|
|
/// Sets the value the AY would read from its data lines if it were not outputting.
|
|
void set_data_input(uint8_t r);
|
|
|
|
/// Gets the value that would appear on the data lines if only the AY is outputting.
|
|
uint8_t get_data_output();
|
|
|
|
/// Sets the
|
|
void set_control_lines(ControlLines control_lines);
|
|
|
|
/*!
|
|
Gets the value that would appear on the requested interface port if it were in output mode.
|
|
@parameter port_b @c true to get the value for Port B, @c false to get the value for Port A.
|
|
*/
|
|
uint8_t get_port_output(bool port_b);
|
|
|
|
// to satisfy ::Outputs::Speaker (included via ::Outputs::Filter; not for public consumption
|
|
void get_samples(unsigned int number_of_samples, int16_t *target);
|
|
|
|
private:
|
|
int selected_register_;
|
|
uint8_t registers_[16], output_registers_[16];
|
|
|
|
int master_divider_;
|
|
|
|
int tone_periods_[3];
|
|
int tone_counters_[3];
|
|
int tone_outputs_[3];
|
|
|
|
int noise_period_;
|
|
int noise_counter_;
|
|
int noise_shift_register_;
|
|
int noise_output_;
|
|
|
|
int envelope_period_;
|
|
int envelope_divider_;
|
|
int envelope_position_;
|
|
int envelope_shapes_[16][32];
|
|
int envelope_overflow_masks_[16];
|
|
|
|
int volumes_[16];
|
|
|
|
enum ControlState {
|
|
Inactive,
|
|
LatchAddress,
|
|
Read,
|
|
Write
|
|
} control_state_;
|
|
|
|
void select_register(uint8_t r);
|
|
void set_register_value(uint8_t value);
|
|
uint8_t get_register_value();
|
|
|
|
uint8_t data_input_, data_output_;
|
|
|
|
int16_t output_volume_;
|
|
inline void evaluate_output_volume();
|
|
};
|
|
|
|
};
|
|
|
|
#endif /* AY_3_8910_hpp */
|