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Work on Issue #44: Removed GLContext interface and merged functionality into GlCanvas. Introducing abstract (Qt-free) tgt::GlContextManager interface, being implemented by tgt::QtContextManager. Further clean up of related code.

Removing TBB library from /ext making it fully external (user has to install TBB himself). Adapted CMake files. Adapted include directions

 * Fixed Issue #38: Made common GLSL header conform to the standards (no samplers in structs)
 * Fixed failing destruction of OpenGL buffers when destructing GeometryData from threads without OpenGL context
 * Fixed wrong pointers in GLContexts due to using this pointer of incompletely constructed class

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@463 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@449 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@335 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@199 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * QtContextManager uses QtThreadedCanvas
 * cleaned up tgt


git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@198 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

It took quite some time, but this commit introduces thread-safe management and access to multiple OpenGL contexts.
 * added tgt::QtContextManager for managing multiple OpenGL contexts
 * adapted tgt::GLContext and tgt::QtGLContext, tgt::QtThreadedPainter
 * added PipelineEvaluator for evaluating pipelines in separate threads
 * added various lock/sync features to processors, pipelines, and processors

However, there's still plenty of clean-up work to do: some parts of the tgt library are quite messed up and the core library interfaces need some polishing...


git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@195 bb408c1c-ae56-11e1-83d9-df6b3e0c105e