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226 lines
6.4 KiB
C++
226 lines
6.4 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/Implementation/SampleSource.hpp"
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#include "../../Concurrency/AsyncTaskQueue.hpp"
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#include "../../Reflection/Struct.hpp"
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namespace GI {
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namespace AY38910 {
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/*!
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A port handler provides all input for an AY's two 8-bit ports, and may optionally receive
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active notification of changes in output.
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Machines with an AY without ports or with nothing wired to them need not supply a port handler.
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Machines that use the AY ports as output but for which polling for changes is acceptable can
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instead use AY38910.get_port_output.
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*/
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class PortHandler {
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public:
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/*!
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Requests the current input on an AY port.
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@param port_b @c true if the input being queried is Port B. @c false if it is Port A.
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*/
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virtual uint8_t get_port_input([[maybe_unused]] bool port_b) {
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return 0xff;
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}
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/*!
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Sets the current output on an AY port.
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@param port_b @c true if the output being posted is Port B. @c false if it is Port A.
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@param value the value now being output.
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*/
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virtual void set_port_output([[maybe_unused]] bool port_b, [[maybe_unused]] uint8_t value) {}
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};
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/*!
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Names the control lines used as input to the AY, which uses CP1600 bus semantics.
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*/
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enum ControlLines {
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BC1 = (1 << 0),
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BC2 = (1 << 1),
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BDIR = (1 << 2)
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};
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enum class Personality {
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/// Provides 16 volume levels to envelopes.
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AY38910,
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/// Provides 32 volume levels to envelopes.
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YM2149F
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};
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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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This AY has an attached mono or stereo mixer.
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*/
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template <bool is_stereo> class AY38910: public ::Outputs::Speaker::SampleSource {
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public:
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/// Creates a new AY38910.
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AY38910(Personality, Concurrency::DeferringAsyncTaskQueue &);
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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 current control line state, as a bit field.
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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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/*!
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Sets the port handler, which will receive a call every time the AY either wants to sample
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input or else declare new output. As a convenience, current port output can be obtained
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without installing a port handler via get_port_output.
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*/
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void set_port_handler(PortHandler *);
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/*!
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Enables or disables stereo output; if stereo output is enabled then also sets the weight of each of the AY's
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channels in each of the output channels.
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If a_left_ = b_left = c_left = a_right = b_right = c_right = 1.0 then you'll get output that's effectively mono.
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a_left = 0.0, a_right = 1.0 will make A full volume on the right output, and silent on the left.
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a_left = 0.5, a_right = 0.5 will make A half volume on both outputs.
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*/
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void set_output_mixing(float a_left, float b_left, float c_left, float a_right = 1.0, float b_right = 1.0, float c_right = 1.0);
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// to satisfy ::Outputs::Speaker (included via ::Outputs::Filter.
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void get_samples(std::size_t number_of_samples, int16_t *target);
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bool is_zero_level() const;
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void set_sample_volume_range(std::int16_t range);
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static constexpr bool get_is_stereo() { return is_stereo; }
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private:
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Concurrency::DeferringAsyncTaskQueue &task_queue_;
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int selected_register_ = 0;
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uint8_t registers_[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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uint8_t output_registers_[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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int master_divider_ = 0;
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int tone_periods_[3] = {0, 0, 0};
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int tone_counters_[3] = {0, 0, 0};
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int tone_outputs_[3] = {0, 0, 0};
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int noise_period_ = 0;
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int noise_counter_ = 0;
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int noise_shift_register_ = 0xffff;
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int noise_output_ = 0;
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int envelope_period_ = 0;
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int envelope_divider_ = 0;
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int envelope_position_ = 0, envelope_position_mask_ = 0;
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int envelope_shapes_[16][64];
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int envelope_overflow_masks_[16];
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int volumes_[32];
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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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uint32_t output_volume_;
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void update_bus();
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PortHandler *port_handler_ = nullptr;
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void set_port_output(bool port_b);
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void evaluate_output_volume();
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// Output mixing control.
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uint8_t a_left_ = 255, a_right_ = 255;
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uint8_t b_left_ = 255, b_right_ = 255;
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uint8_t c_left_ = 255, c_right_ = 255;
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friend struct State;
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};
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/*!
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Provides helper code, to provide something closer to the interface exposed by many
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AY-deploying machines of the era.
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*/
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struct Utility {
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template <typename AY> static void write(AY &ay, bool is_data_write, uint8_t data) {
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ay.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BDIR | GI::AY38910::BC2 | (is_data_write ? 0 : GI::AY38910::BC1)));
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ay.set_data_input(data);
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ay.set_control_lines(GI::AY38910::ControlLines(0));
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}
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template <typename AY> static void select_register(AY &ay, uint8_t reg) {
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write(ay, false, reg);
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}
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template <typename AY> static void write_data(AY &ay, uint8_t reg) {
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write(ay, true, reg);
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}
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template <typename AY> static uint8_t read(AY &ay) {
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ay.set_control_lines(GI::AY38910::ControlLines(GI::AY38910::BC2 | GI::AY38910::BC1));
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const uint8_t result = ay.get_data_output();
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ay.set_control_lines(GI::AY38910::ControlLines(0));
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return result;
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}
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};
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struct State: public Reflection::StructImpl<State> {
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uint8_t registers[16]{};
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uint8_t selected_register = 0;
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// TODO: all audio-production thread state.
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State() {
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if(needs_declare()) {
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DeclareField(registers);
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DeclareField(selected_register);
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}
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}
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template <typename AY> void apply(AY &target) {
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// Establish emulator-thread state
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for(uint8_t c = 0; c < 16; c++) {
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target.select_register(c);
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target.set_register_value(registers[c]);
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}
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target.select_register(selected_register);
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}
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};
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}
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}
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#endif /* AY_3_8910_hpp */
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