Allow for when a Scene3D item switches screens

When a Scene3D item switches screens then it will need to be
reinitalized so that the supporting contexts, offscreen surfaces are
set to use the same screen and not the original one. This ensures that
the item is still rendered correctly on the new screen.

This includes a manual test using QQuickWidget in separate windows that
enables it going from one screen to the other.

This is a fresh version after the previous version was found to have a
bug shown in the scene3d-loader test which has now been resolved.

Change-Id: I3c711e894018db52ec00a8a5d2e0fb0128743ab1
Done-with: Antti Kokko <antti.kokko@qt.io>
Fixes: QTBUG-79192
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 152 insertions, 0 deletions

diff --git a/tests/manual/quickwidget-switch/main.qml b/tests/manual/quickwidget-switch/main.qml
new file mode 100644
index 000000000..d4bce020c
--- /dev/null
+++ b/tests/manual/quickwidget-switch/main.qml
@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.2 as QQ2
+import Qt3D.Core 2.0
+import Qt3D.Render 2.0
+import Qt3D.Input 2.0
+import Qt3D.Extras 2.0
+
+import QtQuick.Scene3D 2.0
+
+QQ2.Item {
+    id: mioitem
+    width: 300
+    height: 300
+    Scene3D {
+        id: scene3d
+        anchors.fill: parent
+        Entity {
+            id: sceneRoot
+
+            Camera {
+                id: camera
+                projectionType: CameraLens.PerspectiveProjection
+                fieldOfView: 45
+                aspectRatio: 16/9
+                nearPlane : 0.1
+                farPlane : 1000.0
+                position: Qt.vector3d( 0.0, 0.0, -40.0 )
+                upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
+                viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
+            }
+
+            OrbitCameraController {
+                camera: camera
+            }
+
+            components: [
+                RenderSettings {
+                    activeFrameGraph: ForwardRenderer {
+                        clearColor: Qt.rgba(0, 0.5, 1, 1)
+                        camera: camera
+                    }
+                },
+                // Event Source will be set by the Qt3DQuickWindow
+                InputSettings { }
+            ]
+
+            PhongMaterial {
+                id: material
+            }
+
+            TorusMesh {
+                id: torusMesh
+                radius: 5
+                minorRadius: 1
+                rings: 100
+                slices: 20
+            }
+
+            Transform {
+                id: torusTransform
+                scale3D: Qt.vector3d(1.5, 1, 0.5)
+                rotation: fromAxisAndAngle(Qt.vector3d(1, 0, 0), 45)
+            }
+
+            Entity {
+                id: torusEntity
+                components: [ torusMesh, material, torusTransform ]
+            }
+
+            SphereMesh {
+                id: sphereMesh
+                radius: 3
+            }
+
+            Transform {
+                id: sphereTransform
+                property real userAngle: 0.0
+                matrix: {
+                    var m = Qt.matrix4x4();
+                    m.rotate(userAngle, Qt.vector3d(0, 1, 0));
+                    m.translate(Qt.vector3d(20, 0, 0));
+                    return m;
+                }
+            }
+
+            QQ2.NumberAnimation {
+                target: sphereTransform
+                property: "userAngle"
+                duration: 10000
+                from: 0
+                to: 360
+
+                loops: QQ2.Animation.Infinite
+                running: true
+            }
+
+            Entity {
+                id: sphereEntity
+                components: [ sphereMesh, material, sphereTransform ]
+            }
+        }
+    }
+}