[mapserver-dev] OpenGL Renderer bugs

[Toby Rahilly]

Hi Mark,

Thanks for looking into this.

Unfortunately I am away for the next week and wont be able to look
into it straight away.

In the mean time could you please send your environment details: Video
card exact model number, exact video card driver version, operating
system, any overrides you have set in the drivers such as AA or
filtering.

Cheers,
Toby

On Fri, Jun 24, 2011 at 10:48 PM, Mark Deneen <mdeneen at gmail.com> wrote:
> Now that Mapserver 6.0 is out, I built it on a linux server, and
> attempted to utilize a GTX-580 to render maps.  I wasn't all that
> successful but part of that was the transition from mapserver 5.6.6 to
> 6.0.
>
> I ripped out most of my layers to get a basic map to start with, and
> added the following to my map definition:
>
>
>   OUTPUTFORMAT
>          NAME 'OGL_PNG24'
>          DRIVER OGL/PNG
>          IMAGEMODE RGB
>   END
>
>
> Which should be enough to trigger the OGL renderer.  However, judging
> from the debug output, it's not using OGL but rather AGG.  I added
> some debug output to mapoutput.c
>  to msCreateDefaultOutputFormat(...) where it checks for OGL:
>
> msSetError(MS_OGLERR, "Checking for OGL (%s)", "test", driver);
>
>
> And, to my surprise, this was in the log:
>
> [Thu Jun 23 17:49:00 2011].480192 test: Renderer error. Checking for
> OGL (OGL/PNG)
> [Thu Jun 23 17:49:00 2011].482227 CGI Request 12 on process 3284
> [Thu Jun 23 17:49:00 2011].482287 test: Renderer error. Checking for
> OGL (AGG/PNG)
>
> It looks like the output driver is lost when using FCGI and it resets
> to AGG/PNG.  I just altered msInitializeRendererVTable so that it uses
> OGL for the MS_RENDER_WITH_AGG case to force the OGL renderer.
>
> I also noticed some errors in the log from ms_uint32
> OglContext::getTextureSize(GLuint dimension, ms_uint32 value).  It is
> checking to see if the last parameter to glGetTexLevelParameteriv is 0
> but, from reading the documentation on glGetTexLevelParameteriv, this
> sort of check looks wrong.  The doc states "If an error is generated,
> no change is made to the contents of params." and since check is
> initially set to 0, it looks like this may be doing the opposite of
> what was intended.
>
> I was able to confirm that mapserver was, in fact, using OGL/GLX to
> render.  However, none of my labels or roads show up and all of my
> "shields" for the roads are in the upper left hand corner of the
> image.
>
> Additionally, at least when using FCGI, nvidia-smi -q shows increased
> memory usage on the video card with each request.  This appears to be
> freed when I terminate the mapserver FCGI process.
>
> Would I be better off using the latest SVN?  Is using OGL _and_ FCGI
> at the same time a bad idea?
>
> Best Regards,
> Mark Deneen
> _______________________________________________
> mapserver-dev mailing list
> mapserver-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-dev
>