GitLab

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

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

removed getElementXD() and getElementXDNormalized() from core GLSL headers since the same functionality is directly provided by GLSL with texture() and texelFetch() in a much cleaner way.

 * use texture and textureOffset instead of clumsy getElement3DNormalized
 * introducing Sobel filtered gradients

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

 * added computation of difference image to SimilarityMeasure
 * fixed possible out of bounds access in datacontainerinspectorwidget.cpp
 * added assertions to ImageRepresentationGL constructor

* OpenGl based reduction in core tools
* SimilarityMeasure processor stub

* Fixed pointer inconsistencies in ScopedTypedData and ScopedRepresentation

+ Using passthrough.vert and geometryrenderer.frag instead of the meshGeometryRenderer.vert and meshgeometryrenderer.frag
+ adding comments for the destroy function of GeometryTextureInfo and why to use it.
+ Change the depth buffer size changing part of Paint() function in datacontainerinspectorcanvas checking part.
+ Delete the commented codes which are not necessary.
+ Fix the opening braces and removing the redundant parts and only for debugging parts.
+ DVRVis and volumerendererdemo default file is revereted to the original locations.
+ Revert the shaders to the original ones.
+ StartMouseDrag and EndMouseDrag functions of the trackball are replaced with mousePress and mouseRelease.

- Delete the meshGeometryRenderer.vert and meshgeometryrenderer.frag.

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 #88: cleaned up VertexArrayObject interface. It's now simpler and more straight-forward.

* Adapted shaders to new texture formats

+ Moving the geomteryshader vertex and fragment shader to application folder as they belong to it.
+ Removing unndeeded shader code.
+ Opening braces convention is considered for datacontainerinspectorcanvas.cpp and datacontainerinspectorcanvas.h  also.
+ Reusing textues for color and depth buffers instead of creating and deleting them.
+ adding gettrackball function to trackball event handler.
+ modifying resetcontent, mouse events in datacontainerinspectorcanvas class
+ using one depth buffer for datacontainerinspectorcanvas instead of one for every color buffer
+ using one frame buffer for whole datacontainerinspectorcanvas instead of one for every frame

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

Bugs:
- Invalid Enumerator during the rendering mesh
- Problems in deleting the generated color and depth textures.
- Depth darkening still has problem :(

+ update the get function of abstractproperty.h and abstractproperty.cpp to support the const objects.

- Still sufring from invalid enumerator in meshgeomtery rendering.

# Adding functionality to render the mesh in the DataContainerInspectorCanvas and camera rotating around the object

# Fixing the bugs of the Color Window in the Canvas

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.

added AbstractProcessor::FIRST_FREE_TO_USE_INVALIDATION_LEVEL enum value to easier add new enum values in derived classes

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

reverted changes from e7b11bfa: "added s_changed signal of properties also being propagated to its shared properties"
This was weak design and lead to problems with the AutoEvaluationPipeline.

Introducing usage of C++11 lambda functions instead of functors in some tbb::parallel_for blocks for better readibility

 * fixed 1D geometry TF editor
 * introduced OptionProperty to specify gradient computation mode
 * added s_changed signal of properties also being propagated to its shared properties
 * fixed sampling rate compensation when using adaptive sampling in simpleraycaster.frag

# Make a pointer from datacontainerinspectorwidget into datacontainerinspectorcanvas, as we need to call the updateInfoWidget() after updating the color.

# Make the updateInfoWidget() as public to be able to call it.

# Add the Capability to look up the color under the mouse button when one of the mouse buttons is pressed.

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