Add Qt screen widget

include/panda_qt/screen.hpp

@@ -0,0 +1,36 @@
+#pragma once
+#include <QWidget>
+#include <memory>
+
+#include "gl/context.h"
+#include "window_info.h"
+
+// OpenGL widget for drawing the 3DS screen
+class ScreenWidget : public QWidget {
+	Q_OBJECT
+
+  public:
+	ScreenWidget(QWidget* parent = nullptr) : QWidget(parent) {
+		// Create a native window for use with our graphics API of choice
+		setAutoFillBackground(false);
+		setAttribute(Qt::WA_NativeWindow, true);
+		setAttribute(Qt::WA_NoSystemBackground, true);
+		setAttribute(Qt::WA_PaintOnScreen, true);
+		setAttribute(Qt::WA_KeyCompression, false);
+		setFocusPolicy(Qt::StrongFocus);
+		setMouseTracking(true);
+
+		if (!createGLContext()) {
+			Helpers::panic("Failed to create GL context for display");
+		}
+	}
+
+  private:
+	std::unique_ptr<GL::Context> glContext = nullptr;
+	bool createGLContext();
+
+	qreal devicePixelRatioFromScreen() const;
+	int scaledWindowWidth() const;
+	int scaledWindowHeight() const;
+	std::optional<WindowInfo> getWindowInfo();
+};