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Makes effort to round out draft 1 of Outputs::Display::Metrics.

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This commit is contained in:
Thomas Harte 2019-03-05 22:01:58 -05:00
parent 5660007221
commit f18132d674
2 changed files with 28 additions and 6 deletions
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19
Outputs/DisplayMetrics.cpp
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@ -8,7 +8,7 @@
#include "DisplayMetrics.hpp"
#include <iostream>
#include <numeric>
using namespace Outputs::Display;
@ -19,8 +19,10 @@ void Metrics::announce_event(ScanTarget::Event event) {
case ScanTarget::Event::EndHorizontalRetrace:
++lines_this_frame_;
break;
case ScanTarget::Event::EndVerticalRetrace:
case ScanTarget::Event::BeginVerticalRetrace:
add_line_total(lines_this_frame_);
break;
case ScanTarget::Event::EndVerticalRetrace:
lines_this_frame_ = 0;
break;
default: break;
@ -28,11 +30,18 @@ void Metrics::announce_event(ScanTarget::Event event) {
}
void Metrics::add_line_total(int total) {
// std::cout << total << '\n';
line_total_history_[line_total_history_pointer_] = total;
line_total_history_pointer_ = (line_total_history_pointer_ + 1) % line_total_history_.size();
}
float Metrics::lines_per_frame_estimate() {
return 1.0f; // TODO.
float Metrics::visible_lines_per_frame_estimate() {
// 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() {
return lines_this_frame_;
}
// MARK: GPU processing speed decisions.

15
Outputs/DisplayMetrics.hpp
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@ -10,6 +10,8 @@
#define DisplayMetrics_hpp
#include "ScanTarget.hpp"
#include <array>
#include <chrono>
namespace Outputs {
@ -22,16 +24,27 @@ namespace Display {
*/
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();
float lines_per_frame_estimate();
/// @returns An estimate of the number of lines being produced per frame, excluding vertical sync.
float visible_lines_per_frame_estimate();
/// @returns The number of lines since vertical retrace ended.
int current_line();
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;