[mapserver-users] OpenGL on Linux (Debian/Ubunu)

[Even Rouault]

On vendredi 2 juin 2017 05:57:25 CEST Schepers, Benjamin wrote:
> Hi Daniel,
> 
> thanks for your advice - I've done exactly the same way you as you described
> it for some years now (doing the painful "average"-resampling due to
> preprocessing the overviews with GDAL and nesrest in WMS-postprocessing).
> The servers and services are "highly optimized" and generally fast - thanks
> to GDAL's and mapserver's functionality and performance and community
> hints. But I wasn't really satisfied with final image-quality, because of
> the trade-of between performance and image-quality on WMS-postprocessing -
> I decided for performance.
 
> From my point of view it still makes a difference in image quality, whether
> I use nearest or average on WMS-postprocessing, especially the
> aliasing-effects on edges of buildings, bridges, etc. would be nearly
> totally eliminated with "average"postprocessing , I did some tests!
 
> My guess was, that resampling could be done much better by the GPU (having a
> look in the world of gaming, where some "super-mega-ultra-antialiasing" is
> done with more than 100 frames per seconds in highest resolutions.

Before going to the GPU, I would look if the MapServer resampling code couldn't already be 
optimized on the CPU. There's likely room for improvements.

 > Now there is an option to get some new servers with integrated GPUs (Nvidia
> GTX1080) and asked myself (and now the community ;-) ) whether it would
> make sense  to exercise that option...

What is not obvious performance wise is that you would need to transfer buffers back and 
forth between the CPU and GPU.

Even

-- 
Spatialys - Geospatial professional services
http://www.spatialys.com
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