[Interest] Qt3D Reading from a Compute Shader

[Russell, Matthew]

Hi,

I was able to build 5.9a (93b18e36e4cee7daccb24b986823360d1707c0a4), but my build can't seem to find the BufferCapture QML object.  The file itself exists, i.e.

/home/matt/usr/local/Qt-5.9.0/include/Qt3DRender/5.9.0/Qt3DRender/private/buffercapture_p.h

And I'm able to build against Qt5.9 in that directory, everything else seems to work, but it simply won't find that QML object.  I'm using CMake as my build system, is there something special I have to do to find this object?

This is my first time running Qt from a build from source.

Thanks,

From: Interest [mailto:interest-bounces+mrussell=neptec.com at qt-project.org] On Behalf Of Juan José Casafranca
Sent: Wednesday, March 1, 2017 6:15 PM
To: interest at qt-project.org
Subject: Re: [Interest] Qt3D Reading from a Compute Shader


I wrote a patch for this some weeks ago. I think is already merged in Qt 5.9. Have a look at the buffercapture example (qt5/qt3d/tests/manual/buffercapture-qml).



Let me know if you have any trouble.



On miércoles, 1 de marzo de 2017 22:09:15 (CET) Russell, Matthew wrote:

> Hi,

>

> Is it possible with QML to read a buffer operated on by a compute shader?

>

> If I understood this message properly,

> http://lists.qt-project.org/pipermail/interest/2016-November/025167.html ,

> then this wasn't possible in 5.8, but might be available in 5.9.

>

> Specifically, I'm showing point data from a lidar in a multi viewport

> Scene3d. My Buffer is used in a Geometry that has a Material on it that

> performs a compute shader in the first pass, and then passes that data to

> the vertex shaders.

>

> My problem is that as I receive new point data from the lidar, I need to

> re-write my data, but I wanna capture the modifications the compute shader

> performed. Otherwise, the compute shader translates my point data

> properly, but when I re-push my buffer, all the translations are forgotten.

>

> Thanks.




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