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

refs #386

refs #386

refs #386

* Added optional picking information to GeometryData API
* GeometryRenderer processor renders the picking information into a separate texture if present
* geometrydata.h contains a stub for a possible rewrite of the API (more flexible buffer layout)

* Fixed crash (due to nullptr) in DataContainerInspectorWidget if DevIL module not present.

* Introducing virtual GeometryData::hasTextureCoordinates()
* Introducing virtual GeometryData::applyTransformationToVertices()

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

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

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.

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.

Further work on Issue #141: Introducing TrackballNavigationEventListener::reinitializeCamera() with tgt::Bounds or the new IHasWorldBounds interface as argument

 * added debug output to DataContainerInspector

* added slice marker rendering to SliceExtractor

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

 * 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@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 memory footprint analysis to DataContainerInspectorWidget

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@306 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

 * fixed TargetType and UsageType of BufferObjects simplifying method signature
 * fix in CLRaycaster

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@272 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added GeometryData base class
 * added early FaceGeometry class

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@270 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

* added DataHandle::removeData
* include/forward declaration clean-up

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@208 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * introduced ReferenceCounted as base class
 * adapted AbstractData, DataHandle and DataContainer

Hence, there is still some work to do to - this version is still not more powerfull than the previous one.

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@201 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

Major revisions to the class layout / data structure:
 * Introduced ImageDataConverter interface (still not really happy with the design)
 * Removed support for Int64 and double images from WeaklyTypedPointer
 * Added ImageDataGL::bind()
 * AbstractProcessor::init() method, gets called by AbstractPipeline::init()
 * added VisualizationProcessor

Updated/New processors:
 * fixed MhdImageReader
 * SliceExtractor stub for very simple slice rendering

Various fixes:
 * DataContaier: managing of DataHandle ownership
 * GenericImageDataLocal::getSubImage()
 * ImageDataRenderTarget bindings
 * GenericProperty
 * linking issues with StringUtils

Hence, all this enables the first usable implementation of a specific pipeline:
The SliceVis pipeline combines MhdImageReader and SliceExtractor for a very simple 2D slice rendering

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@188 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added some initial GLSL shaders
 * work on VisualizationPipeline
 * added SliceVis pipeline stub and SliceExtractor processor stub

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@185 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@163 bb408c1c-ae56-11e1-83d9-df6b3e0c105e