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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

* Included VoxelHierarchyMapper for empty space skipping
* Now can successfully render three volumes at the same time.

Introducing nifty error texture in case that there is nothing to render. Updated copyimage.frag to use texture coordinates instead of viewport pixels.

* Introduced tgt::Shader::IgnoreUniformLocationErrorGuard
* Fixed SimpleRaycaster::updateProperties() and OptimizedRaycaster::updateProperties() not calling base class' updateProperties()

* Updated ProcessorDecoratorGradient to support controllable LOD for gradient computation
* updated RaycastingProcessor to compute min/max depth values of entry/exit points and set as uniforms if needed by shader

* Fixed orientation of XY-slice (flipped along Y axis)
* Implemented background for raycasting result
* Fixed sum for volume rendering integral evaluation in simpleraycaster.frag

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

* Moving to Apache 2.0 license
* Updated AUTHORS.txt

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

* OpenGl based reduction in core tools
* SimilarityMeasure processor stub

* Adapted shaders to new texture formats

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

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@511 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

 * introducing CMBatchGeneration pipeline
 * added fan geometry to ConfidenceMapGenerator
 * added DevilImageReader read to local intensity
 * fixed XYZ color space conversion
 * added Hunter Lab conversion (broken)


git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@475 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

* Fixed L*a*b* mapping in AdvancedUsFusion processor

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@474 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * added tgt::Texture::isDepthTexture()
 * added more color conversions and updated AdvancedUsFusion processor, L*a*b*/L*C*H* still not working correctly...

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@473 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@469 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

further work on AdvancedUsFusion: added further color spaces - conversion functions still have bug though!

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@466 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@441 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

Added colorspace tools shader

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@408 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

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

 * DevilImageReader renders into ImageDataRenderTarget (intermediate solution...)
 * further work on IxpvDemo pipeline
 * RenderTargetCompositor knows difference compositing

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@389 bb408c1c-ae56-11e1-83d9-df6b3e0c105e

 * enabled correct scaling during OpenGL upload
 * changed TypeNormalizer::normalizeToFloat() and TypeNormalizer::denormalizeFromFloat() to normalize signed integers to [0.0, 1.0] (as OpenGL does)
 * adapted TransferFunctionPropertyWidget (still a hack yet)

git-svn-id: https://camplinux.in.tum.de/svn/campvis/trunk@387 bb408c1c-ae56-11e1-83d9-df6b3e0c105e