/usr/include/crystalspace-2.0/iengine/lod.h is in libcrystalspace-dev 2.0+dfsg-1build1.
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Copyright (C) 2001 by Jorrit Tyberghein and Richard D. Shank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CS_IENGINE_LOD_H__
#define __CS_IENGINE_LOD_H__
/**\file
* Level Of Detail (LOD) interfaces
*/
/**
* \addtogroup engine3d_meshes
* @{ */
#include "csutil/scf.h"
struct iSharedVariable;
/**
* The iLODControl interface represents an object that has controllable
* Level Of Detail (LOD) features. The LOD manager can work with this.
*/
struct iLODControl : public virtual iBase
{
SCF_INTERFACE(iLODControl, 2,0,1);
/**
* Set the parameters of the function used to compute the LOD of the mesh
* depending on the distance to the camera. The function is as follows:
* <pre>
* float lod = m * distance + a;
* </pre>
* The result of this function will be capped to the [0,1] range, with
* 0 meaning worst quality possible (highest speed) and 1 highest
* quality.
*/
virtual void SetLOD (float m, float a) = 0;
/**
* Get the current parameters of the LOD function.
*/
virtual void GetLOD (float& m, float& a) const = 0;
/**
* Set the parameters of the LOD function using shared variables.
*/
virtual void SetLOD (iSharedVariable* varm, iSharedVariable* vara) = 0;
/**
* Return the parameters of the LOD function as shared variables. If the
* parameters were not set using shared variables then varm and vara will be
* set to 0.
*/
virtual void GetLOD (iSharedVariable*& varm, iSharedVariable*& vara)
const = 0;
/**
* Get a rough estimate of the number of polygons for a given LOD value
* (between 0 and 1, similar to the value used by SetLOD()).
* Note that a mesh object that doesn't support LOD should always return
* the same number of polygons.
*/
virtual int GetLODPolygonCount (float lod) const = 0;
// @@@ Poke res for docs
/**
* Set the fading factor to be used while transitioning from one LOD to another.
*/
virtual void SetLODFade (float f) = 0;
/**
* Get the fading factor to be used while transitioning from one LOD to another.
*/
virtual void GetLODFade (float& f) const = 0;
/**
* Set the fading factor as a shared variable.
*/
virtual void SetLODFade (iSharedVariable* varf) = 0;
/**
* Set the fading factor as a shared variable. If this factor was not previsouly
* set using shared variables then varf will be set to 0.
*/
virtual void GetLODFade (iSharedVariable*& varf) const = 0;
};
/** @} */
#endif // __CS_IENGINE_LOD_H__
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