source: trunk/VUT/GtpVisibility/include/HierarchyInterface.h @ 74

#ifndef _GtpVisibilityHierarchyInterface_H__
#define _GtpVisibilityHierarchyInterface_H__

#include "DistanceQueue.h"

namespace GtpVisibility {

/**     Class which implements a hierarchy interface for a scene hierarchy.
*/
class HierarchyInterface
{
public:
        /** Default constructor.
        */
        HierarchyInterface();
        virtual ~HierarchyInterface();
        /** Returns true if current node is leaf of the hierarchy. 
                @param node hierarchy node
                @returns true if node is leaf
        */
    virtual bool IsLeaf(HierarchyNode *node) const = 0;
        /** Traverses the given node. 
                @param node the hierarchy node
        */
        virtual void TraverseNode(HierarchyNode *node) = 0;
        /** Renders current scene node .
                @param node current scene node to be rendered
        */
        virtual void RenderNode(HierarchyNode *node) = 0;
        /** Pulls up the visibility from the current node recursively to the parent nodes. 
                @param node the current node 
        */
        virtual void PullUpVisibility(HierarchyNode *node) = 0;
        /** Issue a occlusion query for this node. 
                @param node the current hierarchy node
                @returns occlusion query for this node
        */
        virtual OcclusionQuery *IssueOcclusionQuery(HierarchyNode *node) = 0;
        /** Sets the root of the scene hierarchy.
                @param root the hierarchy root
        */
        void SetSceneRoot(HierarchyNode *root);
    /** Get the root of the scene hierarchy.
                @return the hierarchy root
        */
        HierarchyNode *GetSceneRoot() const;
        /** Sets the scene root and initialises this scene traverser for a traversal.
                @param root current scene root
                @remark initialises some parameters, and also the statistics.
        */
        void InitFrame(HierarchyNode *root);
        /** Returns current frame id.
                @returns frame id
        */
        unsigned int GetFrameId() const;
        /** Returns the current distance queue.
                @returns current distance queue
        */
        DistanceQueue *GetQueue();
        /** Returns true if node 1 has greater distance to the view
                plane than node 2.
                @param node1 the first node to be compared
                @param node2 the second node to be compared
        */                      
        virtual bool HasGreaterDistance(HierarchyNode *node1, HierarchyNode *node2) const = 0;
        /** Checks if the node is visible from the current view frustum.
                @param node the current node
                @param intersects returns true if the current node intersects the near plane
        */
        virtual bool CheckFrustumVisible(HierarchyNode *node, bool &intersects) = 0;
        /** Checks if the node is visible from the current view frustum.
                @param node the current node
        */
        bool CheckFrustumVisible(HierarchyNode *node);
        /** Returns next available occlusion query or creates new one.
                @return the next occlusion query
        */
        virtual OcclusionQuery *GetNextOcclusionQuery() = 0;
        /** Returns true if there is renderable geometry attached to this node
                @param node the current node
                @returns if the node has renderable geometry
        */
    virtual bool HasGeometry(HierarchyNode *node) const = 0;
        /** Sets the visible flag for this node.
                @param node the current node
                @param visible the visible flag
        */
        virtual void SetNodeVisible(HierarchyNode *node, const bool visible) = 0;
        /** Returns true if node has the visible flag set. See set
        */
        virtual bool IsNodeVisible(HierarchyNode *node) const = 0;
        /** Sets the last visited frame id for this node.
                @param node the current node
                @param frameId the current frame id
        */
        virtual void SetLastVisited(HierarchyNode *node, 
                                                                const unsigned int frameId) = 0;
        /** Returns frame id when this node was last visited by the traverser. See set
        */
        virtual unsigned int LastVisited(HierarchyNode *node) const = 0;
        /** Returns number of traversed nodes.
        */
        unsigned int GetNumTraversedNodes();
        /** Returns number of rendered nodes.
        */
        unsigned int GetNumRenderedNodes();

protected:
        
        unsigned int mFrameId;

        int mCurrentTestIdx;
        
        //--- statistics
        unsigned int mNumTraversedNodes;
        unsigned int mNumRenderedNodes;

        DistanceQueue *mDistanceQueue;
        HierarchyNode *mSceneRoot;
        //HierarchyNode *mCurrentNode;
};
} // namespace GtpVisibility
#endif // GtpVisisibilityHierarchyInterface_H