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Builds and runs fine so far, but no elaborate testing done yet. Compiler throws a bunch of C4275 warning, since sigslot:has_slots<> is used in exported classes but is itself not exported. While this is no direct problem for campvis-internal builds, it should still be fixed some time.

refs #377

* RaycastingProcessor now has the p_targetImageID property and optionally uses a custom GLSL version for the shader
* Introducing PropertyCollection::getNestedProperty allowing to get nested properties with a single method call
* Fixed StringUtils::split() methods being broken with multi-character delimiters

C++ implicit conversion rules made ShaderManager::loadSeparate() ambiguous in some cases. So I decided to cut loose ends and completely refactored loading with standard version into ShaderManager::load() and loading with custom version into ShaderManager::loadWithCustomGlslVersion().
ShaderManager::loadSeparate() is no longer available!

Fixed GlReduction, now working reliably for 2D and for 3D images. Added test pipeline GlReduction test.

* Introducing MultiIndexedGeometry data type
* Introducing GeometryDataFactory::createTeapot()

 * Introducing campvis::Tensor2<T> type
 * Updated MhdImageReader to support TensorImages

*IMPORTANT FIX* Fixes possible crashes/segfaults when converting OpenGL image representations to local image representations:
 * ImageRepresentationLocal::tryConvert() does not deadlock anymore when called from OpenGL context and converting from GL representation
 * Fixed possible double deletion after converting from OpenGL to local representation due to ambiguous pointer ownership
 * fixed possible out of bounds array write in tgt::Texture::downloadTextureToBuffer()

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

* Updated DepthDarkening to use GlReduction to compute min/max depth

* OpenGl based reduction in core tools
* SimilarityMeasure processor stub

Cleaned up and slightly revised GeometryData API. Cleared the way for non-value semantics. Introducing GeometryDataFactory, a collection of static methods to create standard geometric primitives.

* Adapted shaders to new texture formats

 * Finished implementation of empty space skipping
 * Renamed Adaptive Step Size to Intersection Refinement (which is more precise in terms of what it's doing)

 * Introducing BinaryBrickingVolume
 * Prototype implementation of computing the BBV lookup volume

Fixed missing/wrong deregistration of GeometryXdTransferFcuntionEditors when their widgets are closed (and hence the GL contexts destroyed)

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

* Introducing DataNamePropertyWidget offering a combo box with all DataHandles in current DataContainer
* added slice rendering to Columbia1 pipeline

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@516 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@514 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* added slice marker rendering to SliceExtractor

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@497 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@495 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* fixed transfer function shader
* let processor unlock call after execution be handled by seperate thread

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@494 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

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@489 bb408c1c-ae56-11e1-83d9-df6b3e0c105e