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Beautifying VolumeExplorerDemo and VolumeRendererDemo sample rederings by fine tuning transfer functions.

Removed oblivious tgt::QtContextManager and merged functionality into tgt::GLCanvas and tgt::GlContextManager. Meanwhile, improved OpenGL context initialization and pipeline creation in CampvisApplication.

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

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.

CampvisApplication manages multiple DataContainers, updated PipelineTreeWidget to show correct DataContainer/Pipeline/Processor hierarchy

Refactoring pipeline concept #5: Moved Pipeline registration to modules module and gen_pipelineregistration.h which will soon be generated by CMake.

Refactoring pipeline concept #4: (Almost) got rid of hard pipeline definition in campvis.cpp. Implemented console argument parsing in CampvisApplication dynamically adding the pipelines listed as arguments

 * each VisualizationProcessor manages its own FBO
 * instead of creating a whole new FBO each process(), the processors shall only create and attach textures to the FBO
 * the FramebufferActivationGuard offers automatic (de)activation and detachment of all textures

SimpleRaycaster already uses the new concept, the rest still uses the legacy API

git-svn-id: https://camplinux.in.tum.de/svn/campvis/branches/gui-redux@520 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@511 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

Rendering canvases, as well as the data container inspector, are now
displayed as tabbed docks in the top docking area. The two docks that
were previously located in the right docking area have been moved to the
left to make the layout more intuitive.

We don't use the main window's central widget, but Qt requires it to
exist. This causes certain sizing problems, e.g. docks located in the
top and bottom docking areas don't expand to take up all the vertical
space, which results in some empty space in the centre of the window.
This will hopefully be fixed soon.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/branches/gui-redux@506 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

When created for the first time, the transfer
function editor is added to the main window and
docked in its right docking area.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/branches/gui-redux@505 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

logViewerDock is a new dock in the main window. Its main widget is
a QTextEdit to which log messages are appended by a QTextEditLog
instance.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/branches/gui-redux@503 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

The application is now single-window by default. The floating windows it
was composed of previously have all been docked in the main window.

Certain widgets (e.g. DataContainerInspectorWidget) may have to be
redesigned to better fit this new layout. Also, displaying multiple
rendering canvases at once is not supported yet.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/branches/gui-redux@501 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * Moved destruction of ReferenceCounted object to seperate thread (thus unloading rendering thread)
 * integration of OpenGL garbage collector into OpenGLJobProcessor (finally, you don't need to care anymore whether your code might call a GL object destructor and hence needs an OpenGL context)
 * changed DataContainer implementation from mutex/lock to concurrent container
 * fixing improper order of GL object deinitilization on program exit

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@492 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

fixed further 64bit warnings

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@479 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * Pipelines evaluate themselves
 * removed the PipelineEvaluator
 * adapted all demo pipelines except OpenCLPipeline

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@462 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

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

* Introducing SimpleJobProcessor for dispatching non-OpenGL-related jobs

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@445 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@354 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@342 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@338 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@327 bb408c1c-ae56-11e1-83d9-df6b3e0c105e