[osg-submissions] Maximum number of graphics contexts and Texture unref image data after apply

[Lionel Lagarde]

Sorry ... I missed the reply.

Here is the file.

Hi,

An osg::Texture can unref its image after its apply. A Texture2D unref 
its image if areAllTextureObjectsLoaded method returns true.

This method checks the if a texture object has been allocated for each
graphic context. The number of graphic context is given by the 
DisplaySettings::getMaxNumberOfGraphicsContexts method.


The 1.2 version of OSG (with Producer) updates the maximum number of 
graphic context for each created window.

The 2.x version of OSG updates the maximum number of graphic context 
only if the new context ID is greater than the current number of graphic 
context.

The attached fix updates the DisplaySettings instance for each created 
GraphicsContext.



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