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bool checkTextureSize( size_t size )
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WGEOffscreenRenderNode::WGEOffscreenRenderNode( osg::ref_ptr< osg::Camera > reference, size_t width, size_t height, bool noHud ):
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WGEOffscreenRenderNode::WGEOffscreenRenderNode( osg::ref_ptr< WGECamera > reference, size_t width, size_t height, bool noHud ):
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m_referenceCamera( reference ),
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m_textureHeight( height ),
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WAssert( checkTextureSize( width ) && checkTextureSize( height ), "Invalid offscreen texture size. Must be power of two and in [8,4096]." );