source: trunk/doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc

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1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the documentation of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:FDL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in a
14** written agreement between you and Nokia.
15**
16** GNU Free Documentation License
17** Alternatively, this file may be used under the terms of the GNU Free
18** Documentation License version 1.3 as published by the Free Software
19** Foundation and appearing in the file included in the packaging of this
20** file.
21**
22** If you have questions regarding the use of this file, please contact
23** Nokia at [email protected].
24** $QT_END_LICENSE$
25**
26****************************************************************************/
27
28/*!
29
30 \page qt-embeddedLinux-accel.html
31
32 \target Hardware Acceleration with Qt for Embedded Linux
33
34 \title Qt for Embedded Linux Hardware Accelerated Graphics
35 \ingroup qt-embedded-linux
36
37
38 \input platforms/emb-hardwareacceleration.qdocinc
39
40 \section1 Windowing on Embedded Linux with Hardware Accelerated Graphics
41
42 Qt for Embedded Linux includes its own windowing system, QWS. QWS was
43 designed in 1999, well before graphics acceleration was available for
44 embedded devices. It does a great job providing a lightweight window
45 manager including all the expected functionality such as arbitrary
46 windows that can be moved, resized, minimized, etc. Getting QWS to work
47 with GPUs is very challenging, particularly with OpenGL and OpenVG
48 because there is no standard way in Linux to share textures across
49 processes. Some silicon vendors provide private APIs to allow texture
50 sharing, others do not. These limitations are documented under the
51 sections describing each type of accelerated hardware APIs. The simplest
52 most generic support for accelerated graphics is a full screen single
53 process single window.
54
55 \section2 General options
56 \list
57 \o QWS, not accelerated, allows arbitrary windowing with multiple
58 processes drawing on the screen.
59 \o X11 with an accelerated X11 driver provided by the silicon
60 vendor. Like QWS, this allows arbitrary windows with multiple
61 processes drawing on the screen. Our experience is that there is
62 some overhead from X11 which will adversely affect framerates.
63 Additionally, our experience is that the drivers from silicon
64 vendors are still maturing.
65 \o Full screen single process single window. This will always work.
66 Some additional capabilities are available and are documented in
67 the acceleration specific API sections.
68 \endlist
69
70 \section1 Supported Hardware Accelerated Graphics APIs
71
72 This table shows which Hardware Accelerated Graphics APIs currently
73 supported by Qt.
74
75 \table
76 \header
77 \o Supported APIs
78 \o API Version
79 \row
80 \o \l {Qt for Embedded Linux and OpenGL}{OpenGL ES}
81 \o 1.x and 2.x
82 \row
83 \o \l {Qt for Embedded Linux and OpenVG}{OpenVG }
84 \o 1.1
85 \row
86 \o \l {Qt for Embedded Linux and DirectFB}{DirectFB}
87 \o 2.0
88 \endtable
89
90
91*/
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