Request for Changes-25: Disable Ice shaders if OpenGL version is lower than 2.0

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[Request for Changes - 21] Support CDS import

Status

Summary

Disable runtime GLSL source-code compilation and use of shaders when running on system which drivers does not provide sufficient OpenGL and GLSL versions. Use standard OpenGL ITK pixel-iterators to store pixel-data into standard OpenGL textures.

Rationale

Allow use of otbIceViewer and Monteverdi on systems which only support old OpenGL drivers such as, for example, remote-desktop systems running on MS-Windows.

This mode allow more users to use otbIceViewer and Monteverdi instead of being stuck.

Implementation details

Classes and files

Image rendering settings are split off from otb::StandardShader into a new otb::ImageSettings class. An instance of it is shared between the otb::GlImageActor and the otb::StandardShader.

otb::GlImageActor now provides a ::CreateShader() method to explicitly instanciate the shader which is not to be called when OpenGL capabilities are not met.

A warning message is output to the console.

OTB: 

M   Modules/Visualization/Ice/include/otbGlImageActor.h
A   Modules/Visualization/Ice/include/otbImageSettings.h
M   Modules/Visualization/Ice/include/otbStandardShader.h
M   Modules/Visualization/Ice/src/CMakeLists.txt
M   Modules/Visualization/Ice/src/otbGlImageActor.cxx
A   Modules/Visualization/Ice/src/otbImageSettings.cxx
M   Modules/Visualization/Ice/src/otbStandardShader.cxx
M   Modules/Visualization/IceViewer/src/otbIceViewer.cxx

Monteverdi: 

M   Code/Application/Monteverdi/mvdMainWindow.cxx
M   Code/Common/Gui/mvdAbstractImageViewRenderer.h
M   Code/Common/Gui/mvdImageViewRenderer.cxx
M   Code/Common/Gui/mvdImageViewRenderer.h
M   Code/Common/Gui/mvdImageViewWidget.h

Applications

N/A

Tests

N/A

Documentation

N/A

Additional notes

N/A

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