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58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
//
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// DisplayMetrics.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/03/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#pragma once
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#include "ScanTarget.hpp"
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#include <array>
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#include <atomic>
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#include <chrono>
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namespace Outputs::Display {
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/*!
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A class to derive various metrics about the input to a ScanTarget,
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based purely on empirical observation. In particular it is intended
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to allow for host-client frame synchronisation.
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*/
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class Metrics {
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public:
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/// Notifies Metrics of a beam event.
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void announce_event(ScanTarget::Event);
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/// Notifies Metrics that the size of the output buffer has changed.
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void announce_did_resize();
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/// Provides Metrics with a new data point for output speed estimation.
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void announce_draw_status(size_t lines, std::chrono::high_resolution_clock::duration, bool complete);
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/// Provides Metrics with a new data point for output speed estimation, albeit without line-specific information.
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void announce_draw_status(bool complete);
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/// @returns @c true if Metrics thinks a lower output buffer resolution is desirable in the abstract; @c false otherwise.
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bool should_lower_resolution() const;
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/// @returns An estimate of the number of lines being produced per frame, excluding vertical sync.
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float visible_lines_per_frame_estimate() const;
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/// @returns The number of lines since vertical retrace ended.
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int current_line() const;
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private:
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int lines_this_frame_ = 0;
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std::array<int, 20> line_total_history_;
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size_t line_total_history_pointer_ = 0;
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void add_line_total(int);
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std::atomic<int> frames_hit_ = 0;
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std::atomic<int> frames_missed_ = 0;
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};
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}
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