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- Lots of missing override definitions
- some virtual overloaded function hiding warnings
- class initializer list order

* InspectorWindow immediately detaches from the MDI surface
* some swapBuffers warning on first creation of the inspector remains

* increased overall font size
* introduced debugging diagnostic to detect when derived processors do not call AbstractProcessor::[de]init()
* fixed processors not adhering to this
* fixed some tab vs spaces problems

invalidate() failed for events triggered by sigslot signals, as the makeCurrent() only works from the Qt main thread. Invalidation now goes through the Qt Signals/Slots mechanism to end up in the right thread.

refs #249

* Updated all CMake scripts to use Qt5
* CampvisApplication takes care of moving the QGLContext thread affinity to the threads that do the rendering.
* QtCanvas:resize() is called through Qt signalling to ensure being in GUI thread.
* Added init and deinit functions to the Runnable interface.
* minimum required CMake version is now 3.0

refs #249

* Implemented GenericImageRepresentationLocal<BASETYPE, NUMCHANNELS>::getElementLinear()
* Added support to ImageRepresentationLocal data to DevilImageWriter
* DataContainerInspector shows texel position during picking

Added concurrent conversion test to ImageRepresentationTest. Added ImageData::getNumRepresentations().

Renamed CampvisPainter to PipelinePainter. The PipelinePainter now directly belongs to the corresponding AbstractPipeline, which also owns the pointer and takes care of creating, (de-)initializing and destroying it.

Apparently, glBindAttribLocation() does not work as planned with AMD GPUs. Therefore, all Shaders yielded black images. Replaced all attribute locations with hard-coded ones in the vertex shader and removed corresponding convenience function from cgt::Shader.

refs #382

* Fixed out-of bounds warnings, when showing 2D-Textures in Inspector
* Fixed bug introduced in 719004e0 which would crash the application when the
  PipelineTreeWidget had no item selected (e.g. when adding a new Pipeline)

Replaced all occurrences of GL_POLYGON render mode with GL_TRIANGLE_FAN since GL_POLYGON is deprecated.

Now it is possible to create CAMPVis images with three dimensions but only a single slice (formerly automatically deduced as 2D image). Adapted/fixed some further code.

refs #613

* cleaned up cgt::Texture's constructors: only two left - to create an empty texture or a non-empty one
* cgt::Texture will no longer hold a copy of the image data in local memory
* removed a lot of redundant/confusing methods
* no longer needed to call uploadTexture() even though you don't want to upload sth.
* Adapted all known code to the new interface
* Removed cgt::TextureReaderDevil

refs #613

* Removed CameraProperty, CameraPropertyWidget and TrackballNavigationEventListener
* replaces all known occurrences of the above three with the new TrackballCameraProvider processor
* introduced TrackballCameraProvider::reinitializeCamera()

refs #141

refs #386

refs #386

Moved AbstractJob and OpenGLJobProcessor from campvis-core to tgt and adapted and cleaned up all necessary includes/references.

The new OpenGL wrapping API allows for full multi-threaded access to OpenGL contexts. Instead of one single thread scheduling all OpenGL jobs for all contexts, the new GlContextManager allows for OpenGL access from multiple threads while ensuring that each OpenGL context is acquired by only one thread at a time.

Detailed list of changes:
* tgt::GlContextManager keeping track of which threads acquire which OpenGL contexts and which threads currently have a context acquired.
* OpenGLJobProcessor does no longer schedules and execute the OpenGL calls for all existing contexts, but only for one single context that can be used for background tasks or other jobs that explicitly need a valid OpenGL context.
* AbstractPipeline now implements the Runnable interface and thus runs in it's own thread. This thread also owns the pipeline's OpenGL context.
* AbstractPipeline has a new pure virtual method executePipeline() that has to perform all computations done by the pipeline.
* AbstractPipeline now takes directly care of calling Painter::paint() of the pipeline's canvas (instead of signalling the Painter). However, the Painter interface needs further cleanup.
* AutoEvaluationPipeline was adapted to the new AbstractPipeline API, hence executing processors is no longer delegated to the OpenGLJobProcessor or the SimpleJobProcessor but entirely done in AutoEvaluationPipeline::executePipeline() and thus in the pipeline's thread.
* Adjusted CampVisApplication, DataContainerInspectorWidget, and GeometryTransferFunctionEditor to the new API.

* Added OpenGL thread guard to image conversions to ImageRepresentationGL.

refs #384

* AbstractData now stores a weak_ptr to its shared_ptr owning group if existant. This avoids unintentional creation of multiple owning groups where each eventually tries to delete the AbstractData on its own (which will certainly not work)
* Updated DataContainer implementation to use a hash map instead of an unordered map.

closes #546
closes #37

* Implemented trackball navigation interaction for rendered geometries
* Implemented correct rendering of textures with correct aspect ration (no longer weirdly stretched textures)
* removed obsolete (because redundant) renderFullscreen option

refs #546
refs #37

* DataContainerInspectorCanvas uses the GeometryRenderer processor to render geometry
* DataContainerInspectorCanvas::_textures now uses DataHandle to improve thread safety avoid segfaults
* replaced some function calls with Qt signals to loose coupling
* removed obsolete fields and methods

refs #546

To now, each property hat an _invalidationLevel field that was evaluated by processors when the property had changed in order to determine what has to be done. However, since properties could also be owned by other classes, this design was semantically misleading.
Therefore, it was removed with this commit and replaced by the invalidation map of each processor. Now, this per-processor mapping of property -> invalidation level is managed by the processor itself. Furthermore, the invalidation level is no longer setup during property creation but during AbstractProcessor::addProperty(), which also makes much more sense.

ATTENTION: Due to these intrusive API changes, the code of all processors and other classes handling properties needs to be changed. As a reminder, the implementation of addProperty() also now takes a reference instead of a pointer, so that old code does no longer compile.

refs #542

Affected classes:
- Columbia1
- AdvancedUsFusion
- StrainFiberRenderer
- SimilarityMeasure
- GeometryRenderer
- DataContainerFileLoaderWidget
- DataContainerInspectorCanva

* Rearranged DataContainerInspectorWidget layout to use less space
* Added option to render custom channels in DataContainerInspectorCanvas

* Support read-out of texel values also for 3D images
* introducing tgt::Texture::texelAsFloat() for 3D images
* Fixed Qt crashes in FloatPropertyWidget caused by changing GUI from non-GUI thread