[osg-users] EXTERNAL: Re: EXTERNAL: Re: EXTERNAL: Re: Where is CreateContextAttribs() being used?

[Chris Hanson]

On Thu, Apr 11, 2019 at 5:46 PM Rowley, Marlin R <marlin.r.rowley at lmco.com>
wrote:

> Sebastian,
>
> I have written the shaders for GL 3.3 so that’s done.  When RenderDoc
> runs, I’m assuming it’s only checking that window context.  I am NOT
> assuming that it can comb through my code and determine that I’ve used a
> fixed-function GL call somewhere and therefore spits out the message.
>

  Well, it's not just the GLSL version, you need to create a context that
either can or can not handle non-core  FFP functions. So, outside of your
shaders, even other pieces of OSG code could be requiring non-core
features. You'd need to build OSG and osgEarth with the proper build
options to completely remove their utilization of any non-core abilities,
and then make sure you (or OSG) create a core-only Context.


> In general, I’d like to have a working GPU debugger.  Right now, we are
> struggling to find out values of local variables in the shaders that aren’t
> uniform.  We would also love to be able to pinpoint bottlenecks in the code
> from the GPU side to optimize performance.
>

Debugging shader local variables in-situ is a pretty weak point of GLSL.

My recommendation is to try to create a toy program that replicates the
critical part of your code, as debugging there will be a lot easier, and
then you can apply the fix to your larger environment. Working within OSG
and osgEarth can be very daunting when things aren't working the way you
expect.



>
>
> ----------------------------------------
>
> Marlin Rowley
>
> Software Engineer, Staff
>
> [image: cid:image002.jpg at 01D39374.DEC5A2E0]
>
> *Missiles and Fire Control*
>
> 972-603-1931 (office)
>
> 214-926-0622 (mobile)
>
> marlin.r.rowley at lmco.com
>
>
>
-- 
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