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ROOT developers retreat Graphics - OpenGL O.Couet July 8 th 2014

Explore the current situation of graphics backends, OpenGL utilization, and output file formats in ROOT developers' retreat. Establish OpenGL as the default backend for seamless 2D and 3D graphics on all platforms.

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ROOT developers retreat Graphics - OpenGL O.Couet July 8 th 2014

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  1. ROOT developers retreat Graphics - OpenGL O.Couet July 8th 2014

  2. Current situation • Graphics backends for screen rendering: • - The main backend (via TVirtualX) on all platforms, but Windows, is X11. • Windows has its own implementation of TVirtualX • In addition to X11 Mac platforms have a Cocoa/Quartz version of TVirtualX. • On all platform the OpenGL backend is available for 2D and 3D graphics. • It can be activated: • at run time via a gStyle setting • or in system.rootrc.

  3. Current situation Output files format: All ROOT output file formats are native and do not depend on the backend used to output on screen. Raster output (based on TASImage): PNG, JPEG, GIF … Vector ouput (native implementations in ROOT): PostScript, PDF, SVG, TeX. All possible formats work the same way on all platforms. It would be nice to have the same kind of standard coverage for the screen default backend….

  4. OpenGL default backend ? • +The so called “GL in pad” (trigered via gStyle) covers all the 2d and 3D graphics needed in ROOT. • + It supports transparency. • -+ it does not support the XOR drawing mode use to interact with objects in pad. But the recent work done to implement “Move opaque” everywhere is a much better solution. The XOR mode is not needed anymore. • - OpenGL has to be installed. But that’s kind of standard these days. • - Remote display (ssh) might be an issue. • - OpenGL does not manage the graphics window. A system like X11 is needed (see Bertrand’s slides). •  In total we are close to be ready to have GL as default backend. •  More deep testing might be needed (some bug are surely still around) but the general infrastructure is in place. •  X11 and Windows backend will be needed for a while as fallback solutions.

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