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Canvas troubleshooting: Difference between revisions
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→Useful C++ changes
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== Useful C++ changes == | == Useful C++ changes == | ||
{{Note|The following patches are intended to help better understand what's going on behind the scenes. They are intended to be regularly rebased onto SG/FG 'next'. In the mid-term, our hope is to ensure that people working on Nasal/Canvas related features get a better understanding about when, where and why Canvas performance is affected.}} | {{Note|The following patches are intended to help better understand what's going on behind the scenes. They are intended to be regularly rebased onto SG/FG 'next'. In the mid-term, our hope is to ensure that people working on Nasal/Canvas related features get a better understanding about when, where and why Canvas performance is affected.}} | ||
=== Adding support for wireframe mode === | === Adding support for wireframe mode === | ||
To enable wireframe mode, we only need to change the osg::StateSet accordingly. Internally, each Canvas element contains a <code>osg::MatrixTransform</code> node - there's a virtual method <code></code> exposed returning the StateSet, so that we can directly modify the stateset: | |||
<syntaxhighlight lang="cpp"> | |||
osg::StateSet *state = getOrCreateStateSet(); | |||
osg::PolygonMode *polyModeObj; | |||
polyModeObj = dynamic_cast< osg::PolygonMode* > | |||
( state->getAttribute( osg::StateAttribute::POLYGONMODE )); | |||
if ( !polyModeObj ) { | |||
polyModeObj = new osg::PolygonMode; | |||
state->setAttribute( polyModeObj ); | |||
} | |||
polyModeObj->setMode( osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE ); | |||
</syntaxhighlight> | |||
This change could be applied globally for each Canvas, or optionally per Canvas Element - the latter is more useful for troubleshooting things without affecting all active Canvas textures. | |||
The corresponding diff for $SG_SRC adding this as a property-controlled option, looks like this: | |||
<syntaxhighlight lang="diff"> | <syntaxhighlight lang="diff"> | ||
</syntaxhighlight> | </syntaxhighlight> | ||