Hi, I'm building Qt5 (latest from git) on an arm board (imx53 QSB). I
am not using X11. I am using the eglfs plugin.
I have attempted to run several of the qtbase demos (like
animatedtiles). In all cases, I get a SEGV in
qpaintengineex_opengl2.cpp:1960 (QGL2PaintEngineEx::begin()).
This code looks like:
1959: d->ctx = d->device->context();
1960: d->ctx->d_ptr->active_engine = this;
d->device->context() is returning NULL, and of course it then cores
when it tries to deref it on line 1960.
I have gone through the eglfs plugin code in as much detail as I can -
The egl display and window surfaces are being created and initialized
properly, and seem to return sane values. The eglCreateContext()
calls in qeglplatformcontext.cpp are working and returning sane
results.
So - where/when is this QGLContext supposed to be created? And why is
it not being created :)
I am very new to the guts of Qt, so please forgive me if I'm missing
something stupid. Any ideas or suggestions are definitely welcome.
Thanks.
PS: I case it's useful, here are a few lines from the backtrace in
gdb (frame #1 is where the trouble is):
#0 0x2c4eb7f4 in QScopedPointer<QGLContextPrivate,
QScopedPointerDeleter<QGLContextPrivate> >::operator-> (this=0x4)
at ../../include/QtCore/../../src/corelib/tools/qscopedpointer.h:109
#1 0x2c520cd8 in QGL2PaintEngineEx::begin (this=0x358d8, pdev=0x355a8)
at gl2paintengineex/qpaintengineex_opengl2.cpp:1960
#2 0x2b68c558 in QPainter::begin (this=0x7eedf430, pd=0x355a8)
at painting/qpainter.cpp:1826
#3 0x2b68ab28 in QPainter (this=0x7eedf430, pd=0x2f868)
at painting/qpainter.cpp:1470
#4 0x2ac371b0 in QWidgetPrivate::drawWidget (this=0x2f878, pdev=0x355a8,
rgn=@0x7eedf550, offset=@0x7eedf59c, flags=4, sharedPainter=0x0,
backingStore=0x35350) at kernel/qwidget.cpp:5091
I have more if you like :)
--
Jon Trulson
"Get the cheese to sickbay, the Doctor should look at it as soon as
possible." -- Chief Engineer B'Elanna Torres, Voyager
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