1 | /**************************************************************************** |
2 | ** |
3 | ** Copyright (C) 2017 The Qt Company Ltd. |
4 | ** Contact: https://www.qt.io/licensing/ |
5 | ** |
6 | ** This file is part of the examples of the Qt Toolkit. |
7 | ** |
8 | ** $QT_BEGIN_LICENSE:BSD$ |
9 | ** Commercial License Usage |
10 | ** Licensees holding valid commercial Qt licenses may use this file in |
11 | ** accordance with the commercial license agreement provided with the |
12 | ** Software or, alternatively, in accordance with the terms contained in |
13 | ** a written agreement between you and The Qt Company. For licensing terms |
14 | ** and conditions see https://www.qt.io/terms-conditions. For further |
15 | ** information use the contact form at https://www.qt.io/contact-us. |
16 | ** |
17 | ** BSD License Usage |
18 | ** Alternatively, you may use this file under the terms of the BSD license |
19 | ** as follows: |
20 | ** |
21 | ** "Redistribution and use in source and binary forms, with or without |
22 | ** modification, are permitted provided that the following conditions are |
23 | ** met: |
24 | ** * Redistributions of source code must retain the above copyright |
25 | ** notice, this list of conditions and the following disclaimer. |
26 | ** * Redistributions in binary form must reproduce the above copyright |
27 | ** notice, this list of conditions and the following disclaimer in |
28 | ** the documentation and/or other materials provided with the |
29 | ** distribution. |
30 | ** * Neither the name of The Qt Company Ltd nor the names of its |
31 | ** contributors may be used to endorse or promote products derived |
32 | ** from this software without specific prior written permission. |
33 | ** |
34 | ** |
35 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
36 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
37 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
38 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
39 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
40 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
41 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
42 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
43 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
44 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
45 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
46 | ** |
47 | ** $QT_END_LICENSE$ |
48 | ** |
49 | ****************************************************************************/ |
50 | |
51 | #include "fbitem.h" |
52 | #include <QtGui/QOpenGLFramebufferObject> |
53 | #include <QtGui/QOpenGLContext> |
54 | #include <QtGui/QOpenGLFunctions> |
55 | #include <QtCore/QDebug> |
56 | |
57 | #if QT_CONFIG(opengl) |
58 | class FbRenderer : public QQuickFramebufferObject::Renderer |
59 | { |
60 | public: |
61 | FbRenderer() { } |
62 | |
63 | // The lifetime of the FBO and this class depends on how QQuickWidget |
64 | // manages the scenegraph and context when it comes to showing and hiding |
65 | // the widget. The actual behavior is proven by the debug prints. |
66 | ~FbRenderer() override { |
67 | qDebug(msg: "FbRenderer destroyed" ); |
68 | } |
69 | |
70 | void render() override { |
71 | QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions(); |
72 | f->glClearColor(red: c, green: 0, blue: 0, alpha: 1); |
73 | f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); |
74 | c += 0.01f * dir; |
75 | if (c >= 1.0f || c <= 0.0f) |
76 | dir *= -1; |
77 | update(); |
78 | } |
79 | |
80 | QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) override { |
81 | qDebug() << "Creating FBO" << size; |
82 | QOpenGLFramebufferObjectFormat format; |
83 | format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil); |
84 | return new QOpenGLFramebufferObject(size, format); |
85 | } |
86 | |
87 | private: |
88 | float c = 0; |
89 | int dir = 1; |
90 | }; |
91 | #endif |
92 | |
93 | QQuickFramebufferObject::Renderer *FbItem::createRenderer() const |
94 | { |
95 | #if QT_CONFIG(opengl) |
96 | return new FbRenderer; |
97 | #else |
98 | return nullptr; |
99 | #endif |
100 | } |
101 | |