[Interest] Qt 5.8 qt3d examples not working on Raspberry Pi 3

[Sean Harmer]

Hi,

it sounds like the GLSL compiler is barfing on something in one of the shaders 
you are using. I don't personally have access to a raspberry pi 3 at the 
moment but we'd of course like Qt 3D to work on such devices too. Can you file 
a JIRA with instructions on how to reproduce with a small example please? I'll 
see if anybody here has a rasp-pi 3 to test on so that we can fix this.

All the best,

Sean

On Wednesday 01 March 2017 00:40:49 Pierre Chicoine wrote:
> Qt3d 5.8 examples are not working on Raspberry Pi 3 using Raspbian Jessie.
> I'm using the latest Raspberry PI toolkit not Yocto. Should I use a
> different board?
> 
> I've tried all GL driver modes in raspi-config. The current VC4 driver
> doesnt' work. Strangely enough, the Raspberry PI works with qopenglwidget
> so opengl examples works but not QT3d. I was going to try to compile the
> fragment shaders directly but I can't find a fragment shader that even has
> 41 lines of code in the Qt3d toolkit. (Refer to error below).
> 
> I'm asking this sincerely, I know that KDAB is not technically responsible
> and you've done a great job getting Qt3d working on desktop. The code looks
> like a very capable toolkit.
> 
> Sean, are you planning on supporting the Raspberry PI? I've been trying to
> implement Qt3d since before Qt 5.7 when it was officially supported and
> I've tried everything to no avail. Anholt's work on the Raspberry drivers
> don't work and the legacy drivers don't work so I'm seriously thinking
> about giving up several months of work, removing all the work I did to get
> OpenGl working with Qt3d which will take several month to untangle. I
> really don't know what to do from here.
> 
> Please let us know if it is supported or will be and if it or will be, is
> what is the magic used to get it working.
> 
> This is the error returned on the command line (this works just fine on
> desktops):
> 
> No Input Settings found, keyboard and mouse events won't be handled
> Trying to assign a non shareable component to more than one Entity
> QOpenGLShader::link: ERROR:OPTIMIZER-3 (fragment shader, line 41) Support
> for for loops is restricted : right side of condition expression must be
> constant
> Failed to link shader program: ERROR:OPTIMIZER-3 (fragment shader, line 41)
> Support for for loops is restricted : right side of condition expression
> must be constant

-- 
Dr Sean Harmer | sean.harmer at kdab.com | Managing Director UK
KDAB (UK) Ltd, a KDAB Group company
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