mirror of
https://github.com/TomHarte/CLK.git
synced 2025-11-04 00:16:26 +00:00
95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
//
|
|
// DisplayMetrics.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 04/03/2019.
|
|
// Copyright © 2019 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "DisplayMetrics.hpp"
|
|
|
|
#include <numeric>
|
|
|
|
using namespace Outputs::Display;
|
|
|
|
// MARK: Frame size estimation.
|
|
|
|
void Metrics::announce_event(const ScanTarget::Event event) {
|
|
switch(event) {
|
|
case ScanTarget::Event::EndHorizontalRetrace:
|
|
++lines_this_frame_;
|
|
break;
|
|
case ScanTarget::Event::BeginVerticalRetrace:
|
|
add_line_total(lines_this_frame_);
|
|
break;
|
|
case ScanTarget::Event::EndVerticalRetrace:
|
|
lines_this_frame_ = 0;
|
|
break;
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
void Metrics::add_line_total(const int total) {
|
|
line_total_history_[line_total_history_pointer_] = total;
|
|
line_total_history_pointer_ = (line_total_history_pointer_ + 1) % line_total_history_.size();
|
|
}
|
|
|
|
float Metrics::visible_lines_per_frame_estimate() const {
|
|
// Just average the number of records contained in line_total_history_ to provide this estimate;
|
|
// that array should be an even number, to allow for potential interlaced sources.
|
|
return float(
|
|
std::accumulate(line_total_history_.begin(), line_total_history_.end(), 0)) / float(line_total_history_.size()
|
|
);
|
|
}
|
|
|
|
int Metrics::current_line() const {
|
|
return lines_this_frame_;
|
|
}
|
|
|
|
// MARK: GPU processing speed decisions.
|
|
|
|
void Metrics::announce_did_resize() {
|
|
frames_missed_ = frames_hit_ = 0;
|
|
}
|
|
|
|
void Metrics::announce_draw_status(const bool complete) {
|
|
if(!complete) {
|
|
++frames_missed_;
|
|
} else {
|
|
++frames_hit_;
|
|
}
|
|
|
|
// Don't allow the record of history to extend too far into the past.
|
|
if(frames_hit_ + frames_missed_ > 200) {
|
|
// Subtract from whichever wasn't just incremented, to ensure the
|
|
// most recent information is more important than the historic stuff.
|
|
if(!complete) {
|
|
--frames_hit_;
|
|
} else {
|
|
--frames_missed_;
|
|
}
|
|
|
|
// Rebalance if either thing has gone negative.
|
|
if(frames_hit_ < 0) {
|
|
frames_missed_ += frames_hit_;
|
|
frames_hit_ = 0;
|
|
}
|
|
if(frames_missed_ < 0) {
|
|
frames_hit_ += frames_missed_;
|
|
frames_missed_ = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
void Metrics::announce_draw_status(size_t, std::chrono::high_resolution_clock::duration, const bool complete) {
|
|
announce_draw_status(complete);
|
|
}
|
|
|
|
bool Metrics::should_lower_resolution() const {
|
|
// If less than 100 frames are on record, return no opinion; otherwise
|
|
// suggest a lower resolution if more than 10 frames in the last 100-200
|
|
// took too long to produce.
|
|
if(frames_hit_ + frames_missed_ < 100) return false;
|
|
return frames_missed_ > 10;
|
|
}
|