97 lines
3.5 KiB
Plaintext
97 lines
3.5 KiB
Plaintext
#ifndef OSGUTIL_DISPLAYLISTVISITOR
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#define OSGUTIL_DISPLAYLISTVISITOR 1
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#include <osg/NodeVisitor>
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#include <osg/Geode>
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#include <osg/State>
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#include <osgUtil/Export>
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namespace osgUtil {
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/** Visitor for traversing scene graph and setting each osg::GeoSet's _useDisplayList flag,
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* with option to immediately compile osg::GeoSet's OpenGL Display lists.
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* The mode of operation
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* of the vistor is controlled by setting the DisplayListMode either on visitor
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* constructor or via the setDisplayListMode() method. DisplayListMode options are:
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* _displayListMode == SWITCH_ON_AND_COMPILE_DISPLAY_LISTS cals gset->compile() on
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* all Geode childern. Note, the visitor must only be used within a valid
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* OpenGL context as compile uses OpenGL calls.
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* _displayListMode == SWITCH_ON_DISPLAY_LISTS sets the Geode's children with
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* gset->setUseDisplayList(true), this method does not directly create display list,
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* or uses OpenGL calls so if safe to use before a valid OpenGL context has been set up.
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* On the next redraw of the scene, the gset's draw methods will be called
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* which then will respond to their _useDisplayList being set by creating display lists
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* automatically.
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* _displayListMode == SWITCH_OFF_DISPLAY_LISTS sets the Geode's children with
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* gset->setUseDisplayList(false), this method does not directly create display list,
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* or uses OpenGL calls so if safe to use before a valid OpenGL context has been set up.
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*/
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class OSGUTIL_EXPORT DisplayListVisitor : public osg::NodeVisitor
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{
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public:
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/** Operation modes of the DisplayListVisitor.*/
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enum DisplayListMode
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{
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SWITCH_ON_AND_COMPILE_DISPLAY_LISTS,
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COMPILE_ON_DISPLAY_LISTS,
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SWITCH_ON_DISPLAY_LISTS,
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SWITCH_OFF_DISPLAY_LISTS
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};
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/** Construct a CompileGeoSetsVisior to traverse all child,
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* with set specfied display list mode. Default mode is to
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* gset->setUseDisplayList(true).
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*/
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DisplayListVisitor(DisplayListMode mode=SWITCH_ON_DISPLAY_LISTS);
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/** Set the operational mode of how the visitor should set up osg::GeoSet's.*/
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void setDisplayListMode(DisplayListMode mode) { _displayListMode = mode; }
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/** Get the operational mode.*/
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DisplayListMode getDisplayListMode() const { return _displayListMode; }
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/** Set the State to use during traversal. */
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void setState(osg::State* state)
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{
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_externalState = state;
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if (_externalState.valid()) _activeState = _externalState;
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else _activeState = _localState;
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}
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osg::State* getState()
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{
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return _activeState.get();
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}
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/** Simply traverse using standard NodeVisitor traverse method.*/
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virtual void apply(osg::Node& node)
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{
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traverse(node);
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}
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/** For each Geode visited set the display list usage according to the
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* _displayListMode.
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*/
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virtual void apply(osg::Geode& node);
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protected:
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DisplayListMode _displayListMode;
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/** local state is created in constructor and used as the default state during traversal.*/
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osg::ref_ptr<osg::State> _localState;
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/** external state is used to override the default state.*/
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osg::ref_ptr<osg::State> _externalState;
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/** active state is equal to _externalState when it is valid, otherwise defaults to _localState.*/
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osg::ref_ptr<osg::State> _activeState;
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};
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};
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#endif
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