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85 lines
2.3 KiB
C++
85 lines
2.3 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.hpp"
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#include "../ClockReceiver/ClockReceiver.hpp"
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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 {
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public:
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Machine() : clock_is_unlimited_(false), delegate_(nullptr) {}
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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 std::shared_ptr<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 std::shared_ptr<Outputs::Speaker> get_speaker() = 0;
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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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// TODO: sever the clock-rate stuff.
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double get_clock_rate() {
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return clock_rate_;
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}
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bool get_clock_is_unlimited() {
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return clock_is_unlimited_;
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}
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class Delegate {
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public:
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virtual void machine_did_change_clock_rate(Machine *machine) = 0;
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virtual void machine_did_change_clock_is_unlimited(Machine *machine) = 0;
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};
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void set_delegate(Delegate *delegate) { delegate_ = delegate; }
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protected:
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void set_clock_rate(double clock_rate) {
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if(clock_rate_ != clock_rate) {
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clock_rate_ = clock_rate;
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if(delegate_) delegate_->machine_did_change_clock_rate(this);
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}
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}
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void set_clock_is_unlimited(bool clock_is_unlimited) {
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if(clock_is_unlimited != clock_is_unlimited_) {
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clock_is_unlimited_ = clock_is_unlimited;
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if(delegate_) delegate_->machine_did_change_clock_is_unlimited(this);
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}
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}
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private:
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Delegate *delegate_;
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double clock_rate_;
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bool clock_is_unlimited_;
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};
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}
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#endif /* CRTMachine_hpp */
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