Adapt to OpenGL related Qt6 QQuickWindow API changes

src/libkwineffects/kwinoffscreenquickview.cpp

@@ -27,6 +27,8 @@
 #include <QOpenGLFramebufferObject>
 #include <QTimer>
 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include <QQuickOpenGLUtils>
+#include <QQuickRenderTarget>
 #include <private/qeventpoint_p.h> // for QMutableEventPoint
 #endif
 
@@ -267,7 +269,11 @@ void OffscreenQuickView::update()
                 return;
             }
         }
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         d->m_view->setRenderTarget(d->m_fbo.data());
+#else
+        d->m_view->setRenderTarget(QQuickRenderTarget::fromOpenGLTexture(d->m_fbo->texture(), d->m_fbo->size()));
+#endif
     }
 
     d->m_renderControl->polishItems();
@@ -275,7 +281,11 @@ void OffscreenQuickView::update()
 
     d->m_renderControl->render();
     if (usingGl) {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
         d->m_view->resetOpenGLState();
+#else
+        QQuickOpenGLUtils::resetOpenGLState();
+#endif
     }
 
     if (d->m_useBlit) {