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84 lines
2.6 KiB
C++
84 lines
2.6 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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// Gmynastics ahoy: if a producer has been specified or previously connected then:
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//
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// (i) if it's a new producer, generate a new scan target and pass it on;
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// (ii) in any case, check whether the underlyiung framebuffer has changed; and
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// (iii) draw.
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//
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// The slightly convoluted scan target forwarding arrangement works around an issue
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// with QOpenGLWidget under macOS, which I did not fully diagnose, in which creating
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// a scan target in ::initializeGL did not work (and no other arrangement really works
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// with regard to starting up).
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if(isConnected || producer) {
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if(producer) {
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isConnected = true;
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framebuffer = defaultFramebufferObject();
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scanTarget = std::make_unique<Outputs::Display::OpenGL::ScanTarget>(framebuffer);
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producer->set_scan_target(scanTarget.get());
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producer = nullptr;
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}
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// Qt reserves the right to change the framebuffer object due to window resizes or if setParent is called;
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// therefore check whether it has changed.
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const auto newFramebuffer = defaultFramebufferObject();
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if(framebuffer != newFramebuffer) {
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framebuffer = newFramebuffer;
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scanTarget->set_target_framebuffer(framebuffer);
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}
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vsyncPredictor.begin_redraw();
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scanTarget->update(width(), height());
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scanTarget->draw(width(), height());
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vsyncPredictor.end_redraw();
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}
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}
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void ScanTargetWidget::vsync() {
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vsyncPredictor.announce_vsync();
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const auto time_now = Time::nanos_now();
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const auto delay_time = ((vsyncPredictor.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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void ScanTargetWidget::setScanProducer(MachineTypes::ScanProducer *producer) {
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this->producer = producer;
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repaint();
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}
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void ScanTargetWidget::stop() {
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makeCurrent();
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scanTarget.reset();
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isConnected = false;
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}
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