Re: [Flightgear-devel] Logging shader errors

[Jonathan R <leg...@gm...>]

Interestingly on next I now see

 VERTEX glCompileShader "" FAILED
  154.50 [WARN]:OSG        VERTEX Shader "" infolog:
0(10) : error C7616: global variable gl_ModelViewProjectionMatrix is
removed after version 140
0(10) : error C7616: global variable gl_Vertex is removed after version 140
0(11) : error C7616: global variable gl_MultiTexCoord0 is removed after
version 140
0(12) : error C7616: global variable gl_Color is removed after version 140

And tooltips are now showing very odd results:
https://i.imgur.com/oM57FJt.png

Jonathan

On Mon, Mar 1, 2021 at 11:48 AM James Turner <ja...@fl...> wrote:

>
>
> > On 25 Feb 2021, at 09:46, James Turner <ja...@fl...> wrote:
> >
> >
> > A helpful person on the OSG list suggested their approach: subclass
> osg::Program, override apply(), and check if the program actually applied
> correctly or not. (That’s only one pointer check per call to
> Program::apply, so should be tolerable)
> >
> > This feels like it should work in our codebase, based on my reading of
> Effect.cxx, but if anyone can spot a problem with this approach, please
> speak up!
>
> Update on this, and a question / notification:
>
> I’m doing this approach now, and it seems to work well, based on my
> breaking some shaders on purpose. Very little intrusion on the Effects
> code, no performance difference that I can see. Will push to next soon for
> others to verify that.
>
> What I am noticing is that within Effect.cxx, we’re not well placed to
> attribute the origin of a shader to an Effect; specifically we might know
> the name of the .eff file but not the pass or technique. Actually we know
> their indices, but that’s not nice from a debugging point of view. So I’m
> thinking to support a <name> element on both techniques and passes.
>
> This would allow us to know the problem is caused by Shader foo_bar.frag,
> in pass “blah” of technique “wibble’ in Effect buildings.eff. There is a
> risk of confusion because some shaders are re-used by multiple effects, but
> I think it’s worth trying, to see if it’s useful. Am I missing anything
> which makes this a bad idea? (I can’t imaging adding a ’name’ to the XML
> for technique/pass is going to break anything, but, stranger things have
> happened.
>
> Kind regards,
> James]
>
>
>
>
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