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Thereby avoids a whole bunch of complicated machinations that would otherwise have been required of the multimachine.
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
//
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// CRTMachine.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 31/05/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef CRTMachine_hpp
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#define CRTMachine_hpp
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#include "../Outputs/CRT/CRT.hpp"
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#include "../Outputs/Speaker/Speaker.hpp"
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#include "../ClockReceiver/ClockReceiver.hpp"
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#include "../ClockReceiver/TimeTypes.hpp"
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#include "ROMMachine.hpp"
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#include <cmath>
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namespace CRTMachine {
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/*!
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A CRTMachine::Machine is a mostly-abstract base class for machines that connect to a CRT,
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that optionally provide a speaker, and that nominate a clock rate and can announce to a delegate
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should that clock rate change.
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*/
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class Machine: public ROMMachine::Machine {
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public:
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/*!
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Causes the machine to set up its CRT and, if it has one, speaker. The caller guarantees
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that an OpenGL context is bound.
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*/
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virtual void setup_output(float aspect_ratio) = 0;
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/*!
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Gives the machine a chance to release all owned resources. The caller guarantees that the
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OpenGL context is bound.
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*/
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virtual void close_output() = 0;
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/// @returns The CRT this machine is drawing to. Should not be @c nullptr.
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virtual Outputs::CRT::CRT *get_crt() = 0;
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/// @returns The speaker that receives this machine's output, or @c nullptr if this machine is mute.
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virtual Outputs::Speaker::Speaker *get_speaker() = 0;
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/// @returns The confidence that this machine is running content it understands.
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virtual float get_confidence() { return 0.5f; }
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virtual void print_type() {}
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/// Runs the machine for @c duration seconds.
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virtual void run_for(Time::Seconds duration) {
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const double cycles = (duration * clock_rate_) + clock_conversion_error_;
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clock_conversion_error_ = std::fmod(cycles, 1.0);
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run_for(Cycles(static_cast<int>(cycles)));
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}
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double get_clock_rate() {
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return clock_rate_;
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}
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protected:
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/// Runs the machine for @c cycles.
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virtual void run_for(const Cycles cycles) = 0;
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void set_clock_rate(double clock_rate) {
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clock_rate_ = clock_rate;
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}
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private:
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double clock_rate_ = 1.0;
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double clock_conversion_error_ = 0.0;
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};
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}
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#endif /* CRTMachine_hpp */
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