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Diffstat (limited to 'doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc')
| -rw-r--r-- | doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc | 62 |
1 files changed, 48 insertions, 14 deletions
diff --git a/doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc b/doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc index 9c18d87..a9bd167 100644 --- a/doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc +++ b/doc/src/platforms/emb-HwAcc-LinuxEmbedded.qdoc @@ -49,23 +49,57 @@ \ingroup qt-embedded-linux - \input platforms/emb-hardwareacceleration.qdocinc + \input platforms/emb-hardwareacceleration.qdocinc -\section1 Supported Hardware Accelerated Graphics APIs + \section1 Windowing on Embedded Linux with Hardware Accelerated Graphics -This list shows which Hardware Accelerated Graphics APIs currently -supported by Qt. + Qt for Embedded Linux includes its own windowing system, QWS. QWS was + designed in 1999, well before graphics acceleration was available for + embedded devices. It does a great job providing a lightweight window + manager including all the expected functionality such as arbitrary + windows that can be moved, resized, minimized, etc. Getting QWS to work + with GPUs is very challenging, particularly with OpenGL and OpenVG + because there is no standard way in Linux to share textures across + processes. Some silicon vendors provide private APIs to allow texture + sharing, others do not. These limitations are documented under the + sections describing each type of accelerated hardware APIs. The simplest + most generic support for accelerated graphics is a full screen single + process single window. - \table - \header - \o Supported Hardware Accelerated Graphics APIs - \row - \o \l {Qt for Embedded Linux and OpenGL}{OpenGL ES} - \row - \o \l {Qt for Embedded Linux and OpenVG}{OpenVG} - \row - \o \l {Qt for Embedded Linux and DirectFB}{DirectFB} - \endtable + \section2 General options + \list + \o QWS, not accelerated, allows arbitrary windowing with multiple + processes drawing on the screen. + \o X11 with an accelerated X11 driver provided by the silicon + vendor. Like QWS, this allows arbitrary windows with multiple + processes drawing on the screen. Our experience is that there is + some overhead from X11 which will adversely affect framerates. + Additionally, our experience is that the drivers from silicon + vendors are still maturing. + \o Full screen single process single window. This will always work. + Some additional capabilities are available and are documented in + the acceleration specific API sections. + \endlist + + \section1 Supported Hardware Accelerated Graphics APIs + + This table shows which Hardware Accelerated Graphics APIs currently + supported by Qt. + + \table + \header + \o Supported APIs + \o API Version + \row + \o \l {Qt for Embedded Linux and OpenGL}{OpenGL ES} + \o 1.x and 2.x + \row + \o \l {Qt for Embedded Linux and OpenVG}{OpenVG } + \o 1.1 + \row + \o \l {Qt for Embedded Linux and DirectFB}{DirectFB} + \o 2.0 + \endtable */ |