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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include "core/perf_stats.h"
#include "performance_overlay.h"
#include "ui_performance_overlay.h"
#include "main_window.h"
#include <QChart>
#include <QChartView>
#include <QGraphicsLayout>
#include <QLineSeries>
#include <QMouseEvent>
#include <QPainter>
#include <QValueAxis>
// TODO(crueter): Reset samples when user changes turbo, slow, etc.
PerformanceOverlay::PerformanceOverlay(MainWindow* parent)
: QWidget(parent), m_mainWindow{parent}, ui(new Ui::PerformanceOverlay) {
ui->setupUi(this);
setAttribute(Qt::WA_TranslucentBackground);
setWindowFlags(Qt::FramelessWindowHint | Qt::Tool);
raise();
// chart setup
m_fpsSeries = new QLineSeries(this);
QPen pen(Qt::red);
pen.setWidth(2);
m_fpsSeries->setPen(pen);
m_fpsChart = new QChart;
m_fpsChart->addSeries(m_fpsSeries);
m_fpsChart->legend()->hide();
m_fpsChart->setBackgroundBrush(Qt::black);
m_fpsChart->setBackgroundVisible(true);
m_fpsChart->layout()->setContentsMargins(2, 2, 2, 2);
m_fpsChart->setMargins(QMargins{4, 4, 4, 4});
// axes
m_fpsX = new QValueAxis(this);
m_fpsX->setRange(0, NUM_FPS_SAMPLES);
m_fpsX->setVisible(false);
m_fpsY = new QValueAxis(this);
m_fpsY->setRange(0, 60);
m_fpsY->setLabelFormat(QStringLiteral("%d"));
m_fpsY->setLabelsColor(Qt::white);
QFont axisFont = m_fpsY->labelsFont();
axisFont.setPixelSize(10);
m_fpsY->setLabelsFont(axisFont);
m_fpsY->setTickCount(3);
// gray-ish label w/ white lines
m_fpsY->setLabelsVisible(true);
m_fpsY->setGridLineColor(QColor(50, 50, 50));
m_fpsY->setLinePenColor(Qt::white);
m_fpsChart->addAxis(m_fpsX, Qt::AlignBottom);
m_fpsChart->addAxis(m_fpsY, Qt::AlignLeft);
m_fpsSeries->attachAxis(m_fpsX);
m_fpsSeries->attachAxis(m_fpsY);
// chart view
m_fpsChartView = new QChartView(m_fpsChart, this);
m_fpsChartView->setRenderHint(QPainter::Antialiasing);
m_fpsChartView->setMinimumHeight(100);
ui->verticalLayout->addWidget(m_fpsChartView, 1);
// thanks Debian.
QFont font = ui->fps->font();
font.setWeight(QFont::DemiBold);
ui->fps->setFont(font);
ui->frametime->setFont(font);
// pos/stats
resetPosition(m_mainWindow->pos());
connect(parent, &MainWindow::positionChanged, this, &PerformanceOverlay::resetPosition);
connect(m_mainWindow, &MainWindow::statsUpdated, this, &PerformanceOverlay::updateStats);
}
PerformanceOverlay::~PerformanceOverlay() {
delete ui;
}
void PerformanceOverlay::resetPosition(const QPoint& _) {
auto pos = m_mainWindow->pos();
move(pos.x() + m_offset.x(), pos.y() + m_offset.y());
}
void PerformanceOverlay::updateStats(const Core::PerfStatsResults& results,
const VideoCore::ShaderNotify& shaders) {
auto fps = results.average_game_fps;
if (!std::isnan(fps)) {
// don't sample measurements < 3 fps because they are probably outliers or freezes
static constexpr double FPS_SAMPLE_THRESHOLD = 3.0;
QString fpsText = tr("%1 fps").arg(std::round(fps), 0, 'f', 0);
// if (!m_fpsSuffix.isEmpty()) fpsText = fpsText % QStringLiteral(" (%1)").arg(m_fpsSuffix);
ui->fps->setText(fpsText);
// sampling
if (fps > FPS_SAMPLE_THRESHOLD) {
m_fpsSamples.push_back(fps);
m_fpsPoints.push_back(QPointF{m_xPos++, fps});
}
if (m_fpsSamples.size() > NUM_FPS_SAMPLES) {
m_fpsSamples.pop_front();
m_fpsPoints.pop_front();
}
// For the average only go back 10 samples max
if (m_fpsSamples.size() >= 2) {
const int back_search = std::min(size_t(10), m_fpsSamples.size() - 1);
double sum = std::accumulate(m_fpsSamples.end() - back_search, m_fpsSamples.end(), 0.0);
double avg = sum / back_search;
ui->fps_avg->setText(tr("Avg: %1").arg(avg, 0, 'f', 0));
}
// chart it :)
if (!m_fpsPoints.empty()) {
auto [min_it, max_it] = std::minmax_element(m_fpsSamples.begin(), m_fpsSamples.end());
double min_fps = *min_it;
double max_fps = *max_it;
ui->fps_min->setText(tr("Min: %1").arg(min_fps, 0, 'f', 0));
ui->fps_max->setText(tr("Max: %1").arg(max_fps, 0, 'f', 0));
m_fpsSeries->replace(QList<QPointF>(m_fpsPoints.begin(), m_fpsPoints.end()));
qreal x_min = std::max(0.0, m_xPos - NUM_FPS_SAMPLES);
qreal x_max = std::max(qreal(10), m_xPos);
m_fpsX->setRange(x_min, x_max);
m_fpsY->setRange(0.0, max_fps);
}
}
auto ft = results.frametime;
if (!std::isnan(ft)) {
// don't sample measurements > 500 ms because they are probably outliers
static constexpr double FT_SAMPLE_THRESHOLD = 500.0;
double ft_ms = results.frametime * 1000.0;
ui->frametime->setText(tr("%1 ms").arg(ft_ms, 0, 'f', 2));
// sampling
if (ft_ms <= FT_SAMPLE_THRESHOLD)
m_frametimeSamples.push_back(ft_ms);
if (m_frametimeSamples.size() > NUM_FRAMETIME_SAMPLES)
m_frametimeSamples.pop_front();
if (!m_frametimeSamples.empty()) {
auto [min_it, max_it] =
std::minmax_element(m_frametimeSamples.begin(), m_frametimeSamples.end());
ui->ft_min->setText(tr("Min: %1").arg(*min_it, 0, 'f', 1));
ui->ft_max->setText(tr("Max: %1").arg(*max_it, 0, 'f', 1));
}
// For the average only go back 10 samples max
if (m_frametimeSamples.size() >= 2) {
const int back_search = std::min(size_t(10), m_frametimeSamples.size() - 1);
double sum = std::accumulate(m_frametimeSamples.end() - back_search,
m_frametimeSamples.end(), 0.0);
double avg = sum / back_search;
ui->ft_avg->setText(tr("Avg: %1").arg(avg, 0, 'f', 1));
}
}
}
void PerformanceOverlay::paintEvent(QPaintEvent* event) {
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.setBrush(m_background);
painter.setPen(Qt::NoPen);
painter.drawRoundedRect(rect(), 10.0, 10.0);
}
void PerformanceOverlay::mousePressEvent(QMouseEvent* event) {
if (event->button() == Qt::LeftButton) {
m_drag_start_pos = event->pos();
}
}
void PerformanceOverlay::mouseMoveEvent(QMouseEvent* event) {
// drag
if (event->buttons() & Qt::LeftButton) {
QPoint new_global_pos = event->globalPosition().toPoint() - m_drag_start_pos;
m_offset = new_global_pos - m_mainWindow->pos();
move(new_global_pos);
}
}
void PerformanceOverlay::closeEvent(QCloseEvent* event) {
emit closed();
}
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