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54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
#include "scantargetwidget.h"
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#include <QDebug>
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#include <QOpenGLContext>
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#include <QTimer>
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#include "../../ClockReceiver/TimeTypes.hpp"
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ScanTargetWidget::ScanTargetWidget(QWidget *parent) : QOpenGLWidget(parent) {}
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ScanTargetWidget::~ScanTargetWidget() {}
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void ScanTargetWidget::initializeGL() {
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// Retain the default background colour.
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const QColor backgroundColour = palette().color(QWidget::backgroundRole());
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glClearColor(backgroundColour.redF(), backgroundColour.greenF(), backgroundColour.blueF(), 1.0);
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// Follow each swapped frame with an additional update.
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connect(this, &QOpenGLWidget::frameSwapped, this, &ScanTargetWidget::vsync);
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}
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void ScanTargetWidget::paintGL() {
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glClear(GL_COLOR_BUFFER_BIT);
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if(scanTarget) {
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vsync_predictor_.begin_redraw();
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scanTarget->update(width(), height());
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scanTarget->draw(width(), height());
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vsync_predictor_.end_redraw();
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}
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}
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void ScanTargetWidget::vsync() {
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vsync_predictor_.announce_vsync();
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const auto time_now = Time::nanos_now();
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const auto delay_time = ((vsync_predictor_.suggested_draw_time() - time_now) / 1'000'000) - 5; // TODO: the extra 5 is a random guess.
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if(delay_time > 0) {
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QTimer::singleShot(delay_time, this, SLOT(repaint()));
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} else {
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repaint();
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}
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}
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void ScanTargetWidget::resizeGL(int w, int h) {
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glViewport(0,0,w,h);
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}
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Outputs::Display::OpenGL::ScanTarget *ScanTargetWidget::getScanTarget() {
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makeCurrent();
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if(!scanTarget) {
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scanTarget = std::make_unique<Outputs::Display::OpenGL::ScanTarget>(defaultFramebufferObject());
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}
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return scanTarget.get();
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}
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