mirror of
https://github.com/TomHarte/CLK.git
synced 2024-08-27 13:29:12 +00:00
229 lines
6.6 KiB
C++
229 lines
6.6 KiB
C++
#include "scantargetwidget.h"
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#include <QApplication>
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#include <QCursor>
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#include <QDebug>
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#include <QDesktopWidget>
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#include <QGuiApplication>
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#include <QKeyEvent>
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#include <QMouseEvent>
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#include <QOpenGLContext>
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#include <QScreen>
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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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setDefaultClearColour();
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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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if(requestedRedrawTime) {
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const auto now = Time::nanos_now();
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vsyncPredictor.add_timer_jitter(now - requestedRedrawTime);
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requestedRedrawTime = 0;
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}
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// TODO: if Qt 5.14 can be guaranteed, just use window()->screen().
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const auto screenNumber = QApplication::desktop()->screenNumber(this);
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QScreen *const screen = QGuiApplication::screens()[screenNumber];
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const float newOutputScale = float(screen->devicePixelRatio());
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if(outputScale != newOutputScale) {
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outputScale = newOutputScale;
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resize();
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}
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vsyncPredictor.set_frame_rate(float(screen->refreshRate()));
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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(scaledWidth, scaledHeight);
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scanTarget->draw(scaledWidth, scaledHeight);
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glFinish(); // Make sure all costs are properly accounted for in the vsync predictor.
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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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if(!isConnected) return;
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vsyncPredictor.announce_vsync();
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const auto time_now = Time::nanos_now();
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requestedRedrawTime = vsyncPredictor.suggested_draw_time();
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const auto delay_time = (requestedRedrawTime - time_now) / 1'000'000;
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if(delay_time > 0 && delay_time < vsyncPredictor.frame_duration()) {
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QTimer::singleShot(delay_time, this, SLOT(repaint()));
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} else {
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requestedRedrawTime = 0;
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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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if(rawWidth != w || rawHeight != h) {
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rawWidth = w;
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rawHeight = h;
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resize();
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}
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}
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void ScanTargetWidget::resize() {
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const int newScaledWidth = int(float(rawWidth) * outputScale);
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const int newScaledHeight = int(float(rawHeight) * outputScale);
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if(newScaledWidth != scaledWidth || newScaledHeight != scaledHeight) {
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scaledWidth = newScaledWidth;
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scaledHeight = newScaledHeight;
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glViewport(0, 0, scaledWidth, scaledHeight);
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}
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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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setDefaultClearColour();
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vsyncPredictor.pause();
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requestedRedrawTime = 0;
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repaint();
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}
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void ScanTargetWidget::setDefaultClearColour() {
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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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}
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void ScanTargetWidget::setMouseDelegate(MouseDelegate *delegate) {
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if(!delegate && mouseIsCaptured) {
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releaseMouse();
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}
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mouseDelegate = delegate;
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setMouseTracking(delegate);
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}
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void ScanTargetWidget::keyReleaseEvent(QKeyEvent *event) {
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// Releasing F8 or F12 needs to be tracked but doesn't actively do anything,
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// so I'm counting that as a Qt ignore.
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if(event->key() == Qt::Key_F8) f8State = false;
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if(event->key() == Qt::Key_F12) f12State = false;
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event->ignore();
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}
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void ScanTargetWidget::keyPressEvent(QKeyEvent *event) {
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// Use either CTRL+Escape or F8+F12 to end mouse captured mode, if currently captured;
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// otherwise ignore the event.
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if(event->key() == Qt::Key_F8) f8State = true;
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if(event->key() == Qt::Key_F12) f12State = true;
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if(mouseIsCaptured && (
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(event->key() == Qt::Key_Escape && event->modifiers()&Qt::ControlModifier) ||
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(f8State && f12State)
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)) {
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releaseMouse();
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QCursor cursor;
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cursor.setShape(Qt::ArrowCursor);
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setCursor(cursor);
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return;
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}
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event->ignore();
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}
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void ScanTargetWidget::releaseMouse() {
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QOpenGLWidget::releaseMouse();
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mouseIsCaptured = false;
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mouseDelegate->setMouseIsCaptured(false);
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}
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void ScanTargetWidget::mousePressEvent(QMouseEvent *event) {
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if(mouseDelegate) {
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if(!mouseIsCaptured) {
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mouseIsCaptured = true;
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grabMouse();
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QCursor cursor;
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cursor.setPos(mapToGlobal(QPoint(width() / 2, height() / 2)));
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cursor.setShape(Qt::BlankCursor);
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setCursor(cursor);
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mouseDelegate->setMouseIsCaptured(true);
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} else {
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setMouseButtonPressed(event->button(), true);
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}
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}
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}
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void ScanTargetWidget::mouseReleaseEvent(QMouseEvent *event) {
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if(mouseDelegate && !mouseIsCaptured) {
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setMouseButtonPressed(event->button(), false);
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}
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}
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void ScanTargetWidget::setMouseButtonPressed(Qt::MouseButton button, bool isPressed) {
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switch(button) {
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default: break;
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case Qt::LeftButton: mouseDelegate->setButtonPressed(0, isPressed); break;
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case Qt::RightButton: mouseDelegate->setButtonPressed(1, isPressed); break;
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case Qt::MiddleButton: mouseDelegate->setButtonPressed(2, isPressed); break;
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}
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}
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void ScanTargetWidget::mouseMoveEvent(QMouseEvent *event) {
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// Recentre the mouse cursor upon every move if it is currently captured.
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if(mouseDelegate && mouseIsCaptured) {
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const QPoint centre = QPoint(width() / 2, height() / 2);
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const QPoint vector = event->pos() - centre;
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mouseDelegate->moveMouse(vector);
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QCursor::setPos(mapToGlobal(centre));
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}
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}
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bool ScanTargetWidget::isMouseCaptured() {
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return mouseIsCaptured;
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}
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