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Stereo module, extended DevilImageReader with builtin filters, minor fix to PredicateDemoSmallHeart pipeline

PipelineRegistry and ProcessorRegistry are now part of campvis-core. Furthermore, moved all calls to PipelineRegistrar<>/SmartProcessorRegistrar<> to a separate cpp file for each module. This way all registrations are at one central location and including headers in external projects does not lead to double registration.

This commit also removes the obsolete columbia and manualsegmentation modules.

* Added modules/modulesapi.h with CAMPVIS_MODULES_API definition (MSVC __declspec switch)
* Updated modules/CMakeLists.txt to allow shared build
* Added CAMPVIS_MODULES_API to every non-templated class definition in campvis-modules

refs #386

* GlGaussianFilter performs a Gaussian blur
* GlIntensityQuantizer quantizes image intensities into bins using a transfer function
* GlSignalToNoiseRatioFilter computes a very simple variance-based SnR value
* GlVesselnessFilter computes a Frangi-similar vesselness measure

* Updated GlGradientVolumeGenerator to generate GL_RGB16F textures to save memory

* Fixed TrackballNavigationEventListener not saving the current scene bounds -> resetting camera too often

Refactoring AbstractProcessor::process() for clearer semantics and better and more uniform handling of invalidation levels:
 * AbstractProcessor::process() now calls updateShader(), updateProperties() and/or updateResult() with respect to the current invalidation level
 * each processor shall no longer override process() but the updateXYZ() methods, at minimum updateResult()
 * AbstractProcessor::process() takes care of (un)locking the processor itself (no need to do this from the outside anymore)

Further implicit changes:
 * Removed redundant HasPropertyCollection::updateProperties()

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

* Split up ProcessorDecoratorShading in ProcessorDecoratorShading inheriting from ProcessorDecoratorGradient
* Introducing GlGradientVolumeGenerator processor in preprocessing module

Fixes -Wignored-qualifiers

Fixes -Wignored-qualifiers

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@405 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* added AbstractPipeline::addProcessor() and VisualizationPipeline::addEventHandler() convenience methods
* some refactoring of property names

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@344 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

The modules package is now itsself modular. Every subdirectory in modules/ builds its own submodule that can be individually switched on and off. Therefore each submodule needs its own submodule.cmake file to specify the build targets etc.
This is neat!

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@340 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@326 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added ImageData::indexToPosition()
 * fixed glsl/tools/transferfunction.frag
 * fixed TextFileParser
 * added GradientVolumeGenerator and LHHistogram processors

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@305 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * introducing geometryrenderer.cpp
 * updated DVRVis pipeline and various processors

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@283 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * introducing ProxyGeometryGenerator
 * updated DVRVis
 * updated TumVisApplication to check for OpenGL and GLSL 3.3

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@276 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * introducing new TUMVis::QuadRenderer using VAO/VBOs
 * started upgrading shaders to GLSL 3.30


git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@271 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added update_legal_header.py script for updating the legal header in all code files of the project
 * ran the file => all TUMVis source files now contain the legal header

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@231 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

some GUI improvements

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@219 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * fixed EEPGenerator and added TrackballNavigationEventHandler to DVRVis

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@217 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added offset and voxelSize to ImageMappingInformation
 * introducing early EEPGenerator processor and DVRVis pipeline

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@215 bb408c1c-ae56-11e1-83d9-df6b3e0c105e