mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-10 08:04:45 +00:00
59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
//
|
|
// DisplayMetrics.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 04/03/2019.
|
|
// Copyright © 2019 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef DisplayMetrics_hpp
|
|
#define DisplayMetrics_hpp
|
|
|
|
#include "ScanTarget.hpp"
|
|
|
|
#include <array>
|
|
#include <chrono>
|
|
|
|
namespace Outputs {
|
|
namespace Display {
|
|
|
|
/*!
|
|
A class to derive various metrics about the input to a ScanTarget,
|
|
based purely on empirical observation. In particular it is intended
|
|
to allow for host-client frame synchronisation.
|
|
*/
|
|
class Metrics {
|
|
public:
|
|
/// Notifies Metrics of a beam event.
|
|
void announce_event(ScanTarget::Event event);
|
|
|
|
/// Notifies Metrics that the size of the output buffer has changed.
|
|
void announce_did_resize();
|
|
|
|
/// Provides Metrics with a new data point for output speed estimation.
|
|
void announce_draw_status(size_t lines, std::chrono::high_resolution_clock::duration duration, bool complete);
|
|
|
|
/// @returns @c true if Metrics thinks a lower output buffer resolution is desirable in the abstract; @c false otherwise.
|
|
bool should_lower_resolution() const;
|
|
|
|
/// @returns An estimate of the number of lines being produced per frame, excluding vertical sync.
|
|
float visible_lines_per_frame_estimate() const;
|
|
|
|
/// @returns The number of lines since vertical retrace ended.
|
|
int current_line() const;
|
|
|
|
private:
|
|
int lines_this_frame_ = 0;
|
|
std::array<int, 20> line_total_history_;
|
|
size_t line_total_history_pointer_ = 0;
|
|
void add_line_total(int);
|
|
|
|
int frames_hit_ = 0;
|
|
int frames_missed_ = 0;
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* DisplayMetrics_hpp */
|