SLAccelStruct.h

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/**
 * \file      SLAccelStruct.h
 * \authors   Marcus Hudritsch
 * \date      July 2014
 * \authors   Marcus Hudritsch
 * \copyright http://opensource.org/licenses/GPL-3.0
*/
 
#ifndef SLACCELSTRUCT_H
#define SLACCELSTRUCT_H
 
#include <SLMesh.h>
 
//-----------------------------------------------------------------------------
//! SLAccelStruct is an abstract base class for acceleration structures
/*! The SLAccelStruct class serves as common class for the SLUniformGrid,
SLCompactGrid and the SLKDTree class. All derived acceleration structures must
be able to build, draw, intersect with a ray and update statistics.
All structures work on meshes.
*/
class SLAccelStruct
{
public:
    SLAccelStruct(SLMesh* m) { _m = m; }
    virtual ~SLAccelStruct() { ; }
 
    virtual void   build(SLVec3f minV, SLVec3f maxV)   = 0;
    virtual void   updateStats(SLNodeStats& stats)     = 0;
    virtual void   draw(SLSceneView* sv)               = 0;
    virtual SLbool intersect(SLRay* ray, SLNode* node) = 0;
    virtual void   disposeBuffers()                    = 0;
 
protected:
    SLMesh* _m;             //!< Pointer to the mesh
    SLVec3f _minV;          //!< min. point of AABB
    SLVec3f _maxV;          //!< max. point of AABB
 
    SLuint  _voxelCnt;      //!< NO. of voxels in accelerator
    SLuint  _voxelCntEmpty; //!< NO. of empty voxels
    SLuint  _voxelMaxTria;  //!< max. no. of triangles pre voxel
    SLfloat _voxelAvgTria;  //!< avg. no. of triangles per voxel
};
//-----------------------------------------------------------------------------
#endif // SLACCELSTRUCT_H