Hi! I'm implementing a plugin for Qt Multimedia for playing video and audio
using hardware acceleration. When opening a content which includes video, I
need to instantiate an OpenGL texture and an EGLImageKHR. To do this I need
to be in the thread with the current OpenGL context, which should
On Apr 11, 2013, at 8:43 PM, Alan Alpert 4163654...@gmail.com wrote:
On Thu, Apr 11, 2013 at 10:08 AM, Michael Andersen
mich...@steelcode.com wrote:
Forgot list in reply.
So no hope of it being fixed in 5.2 then... oh well. I'll go file a bug
report. Does this happen on windows too or is
On Apr 12, 2013, at 9:26 AM, Michael Andersen mich...@steelcode.com
wrote:
Is vsync enabled in your driver? Sounds like it might not be. If not, then Qt
Quick 2.0 will render at 100% cpu rendering maybe many thousands of frames
per second, even though you only see 60 of them.
You are at least not setting the required texture parameters which will make
the texture incomplete. You typically need to set the textures wrap and min/mag
filters at least once:
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,
Antialiasing on an FBO requires FBO multisampling and framebuffer blit support.
Do you have these extensions available?
Cheers,
Gunnar
On 3. mai 2013, at 00:04, Mark mark...@gmail.com wrote:
On Thu, May 2, 2013 at 11:47 PM, Mark mark...@gmail.com wrote:
On Tue, Mar 12, 2013 at 12:22 AM,
On May 5, 2013, at 11:47 AM, Sean Harmer sean.har...@kdab.com wrote:
On 04/05/2013 19:30, Preet wrote:
Hi,
...
2.
I'd like to use ShaderEffects to apply a somewhat trivial shader to most of
the images in my application. The images are black and white icons, and I'd
like to use
On May 14, 2013, at 9:58 AM, Mark mark...@gmail.com wrote:
On Sun, May 12, 2013 at 2:08 PM, Mark mark...@gmail.com wrote:
Hi,
I'm browsing through the Emitter API while searching for some way to
get notified when a particle is expired.
What i'm having is one emitter that emits 1
/qtdeclarative/trees/stable/examples/quick/scenegraph/openglunderqml
[2]
http://www.codeproject.com/Articles/226569/Drawing-polylines-by-tessellation
On Mon, Jun 10, 2013 at 10:07 AM, Sletta Gunnar gunnar.sle...@digia.com
wrote:
On Jun 8, 2013, at 11:33 PM, Mark mark...@gmail.com wrote:
Hi
On Jun 9, 2013, at 12:59 AM, Mark mark...@gmail.com wrote:
Hi,
Yet another scene graph related question :)
I have to say, the documentation in the scene graph department could
really use some more docs and advanced examples! The code leaves a lot
of guess work and there isn't much to find
, Mark mark...@gmail.com wrote:
On Wed, Jun 12, 2013 at 8:29 AM, Sletta Gunnar gunnar.sle...@digia.com
wrote:
This graph concept might be a good usecase for a more complex example
down the line though.. I'll keep it in mind and maybe it will be included
in Qt in the future :)
Oh... that sucks
On Jun 17, 2013, at 2:38 AM, Preet prismatic.proj...@gmail.com wrote:
Hi
I want to render things with OpenGL directly in a QQuickItem (like
http://doc-snapshot.qt-project.org/qt5-dev/qtquick/scenegraph-openglunderqml.html
shows) but I get the impression that doing so means every other
Hi Charley,
Thanks you for your interest in this project :)
The original idea I had for the presentation system was to make it convenient
to mix a slide deck with live QML. It makes the assumption that the user
understands QML.
I agree with you that there are tons of improvements that could
On Sep 7, 2013, at 12:23 AM, Alan Alpert 4163654...@gmail.com wrote:
*actually I still use its precedessor,
https://gitorious.org/qt-qml-demo-playground/qt-qml-demo-playground/source/708de53727032441efd63f4ac24d13079fe82c52:qml-presentation
, because while it's less user-friendly and less
This is very possible :)
The classes you are looking for are:
QWindow - to create the window
QOpenGLContext - to get the OpenGL context
QOpenGLPaintDevice - to make the opengl context renderable with QPainter
QPainter - to draw the text.
cheers,
Gunnar
On Sep 24, 2013, at 4:15 PM, Thomas
You can use a ShaderEffect element. It does not use an FBO for plain Image
types.
Image {
id: myImage
visible: false
}
ShaderEffect {
property variant source: myImage
anchors.fill: myImage
fragmentShader:
varying highp vec2 qt_TexCoord0;
uniform lowp vec4
Hi Josh,
This should be possible, but there are a few things to keep in mind. In Qt 5.1
the QQuickWindows all share the same OpenGL context, so you need to request
multisampling on the first window you show, before you show it. As a result,
all QQuickWindows will get multisampling.
If you
I find it very strange that qmlscene without an input file would produce the
same apitrace as a qmlscene with a file. The apitrace is a reflection what we
try to draw after all and that is highly dependent on what the input is. What
does the trace look like?
It is a long-shot, but you could
A buffer offset of 0 is correct since it is relative to VBO's memory which is
bound just above the lines you pasted down below.
Fra: Narayanarao Rao [nar...@gmail.com]
Sendt: 6. november 2013 11:02
To: Sletta Gunnar
Cc: Interest@qt-project.org
Emne: Re
is unchanged. It will
be a small overall additional cost, and if it is needed, it is needed.
cheers,
Gunnar
Fra: Narayanarao Rao [nar...@gmail.com]
Sendt: 6. november 2013 13:10
To: Sletta Gunnar
Cc: Interest@qt-project.org
Emne: Re: [Interest] Qt 5.2 scenegraph
Is the time spent rendering gone up or is it something else?
Generally, I see improved rendering performance across the board. If you run
the code with QSG_RENDER_TIMING=1 you get some indication of the breakdown of
where time is being spent.
Performance of javascript has gone down some since
The error message has been quite helpful with tracking down errors in the past,
but I guess we can at least remove it from release builds and limit it a bit :)
Added https://bugreports.qt-project.org/browse/QTBUG-34676 to track this.
But why are you showing ShaderEffects which lack their image
If this consistently reproducible across desktop and device, then I would
appreciate a bugreport with an example that reproduces it. It is not a known
issue to me at least. (bugreports.qt-project.org)
Clipping is implemented using scissor or stencil depending on the complexity of
the mask, no
.
- VStevenP
On Thu, 11/14/13, Ola Røer Thorsen o...@silentwings.no wrote:
Subject: Re: [Interest] Tearing in Quick2 flickable-based items with clipping
enabled
To: Sletta Gunnar gunnar.sle...@digia.com
Cc: interest@qt-project.org interest@qt-project.org
I am unsure if it is intended or not, but the problem seems to be that you
don't have a well defined base state to return to when you exit the pressed
state. The result is that the transition will go from the pressed state to
undefined and only after it completes does it apply the original
In Qt Quick 2.0, there is no difference in performance, but there are some
visual aspects you will have to consider. Once you start placing things on
subpixel positions that also means you get antialiased edges on images and
rects, texture sampling in images is no longer pixel-to-pixel, etc.
Hi,
As many of you might already have noticed, OpenGL drivers are not always
working as well as would like. This has always been a problem, but since Qt
Creator 3.0 is using Qt Quick 2.0 and Qt Quick 2.0 is also being used in more
and more places, the problem is becoming more mainstream. We
I suspect that those warnings are indicators of an underlying problem. They
should not be fatal on their own. How does other OpenGL apps work on they
system?
Fra: interest-bounces+gunnar.sletta=digia@qt-project.org
You want to have a look at the new Animator types introduced in Qt 5.2. These
run on the render thread and won't be blocked when the loader is running.
http://doc-snapshot.qt-project.org/qt5-stable/qtquick-statesanimations-topic.html#animators
cheers,
Gunnar
the Yanimation to work for animating the highlighted background from icon
to icon.
- VStevenP
- Original Message -
From: Sletta Gunnar gunnar.sle...@digia.com
To: VStevenP vstevenpa...@yahoo.com; interest@qt-project.org
interest@qt-project.org
Cc:
Sent: Tuesday, December 10, 2013 8:43 AM
Subject: SV
Getting the Image element's textureProvider at the time of
QQuickFrameBufferObject::synchronize should give you a QSGTextureProvider for
that image, assuming that the Image.status == Ready. This is the same mechanism
that ShaderEffect uses internally as well. You are not supposed to use the
You also need to update your code to start the toplevel animation :)
Fra: VStevenP [vstevenpa...@yahoo.com]
Sendt: 12. desember 2013 15:22
To: Sletta Gunnar; interest
Emne: Re: SV: [Interest] Loader seems to be blocking animation
When I try to use this new
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