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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
// -*- C++ -*-
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision: 1.1.1.1 $
|
| Description:
| This file defines the SoIndexedShape node class.
|
| Author(s) : Paul S. Strauss
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_INDEXED_SHAPE_
#define _SO_INDEXED_SHAPE_
#include <Inventor/fields/SoMFInt32.h>
#include <Inventor/nodes/SoVertexShape.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoIndexedShape
//
// Abstract indexed shape node class. All nodes derived from this
// (such as SoIndexedFaceSet and SoIndexedLineSet) are shapes
// that are constructed from vertices defined by indexing into the
// current coordinates. The coordinate indices are stored in the
// coordIndex field, which is used by all subclasses.
//
// One rule is used: all coordinate indices less than 0 may be used
// for special purposes, such as to denote the end of a face or
// polyline. This means that all indices < 0 can be ignored safely
// when looking at vertices.
//
// Depending on the current material, normal, and texture coordinate
// binding values, materials, normals, and texture coordinates may be
// accessed in order or may be indexed using the materialIndex,
// normalIndex, and textureCoordIndex fields.
//
//////////////////////////////////////////////////////////////////////////////
// C-api: abstract
// C-api: prefix=SoInd
class SoIndexedShape : public SoVertexShape {
SO_NODE_ABSTRACT_HEADER(SoIndexedShape);
public:
// Fields inherited by all subclasses:
SoMFInt32 coordIndex; // Coordinate indices
SoMFInt32 materialIndex; // Material indices
SoMFInt32 normalIndex; // Surface normal indices
SoMFInt32 textureCoordIndex; // Texture Coordinate indices
SoINTERNAL public:
static void initClass();
protected:
// Constructor - makes this abstract
SoIndexedShape();
// This handles bounding box computation for all shapes derived
// from this class. It sets the bounding box to contain all
// vertices of the shape, assuming that the shape uses the
// coordinates indexed by all non-negative values in the
// coordIndex field. It also sets the center to the average of the
// vertices' coordinates.
virtual void computeBBox(SoAction *action, SbBox3f &box,
SbVec3f ¢er);
// Returns TRUE if texture coordinates should be indexed
static SbBool areTexCoordsIndexed(SoAction *action);
// Starting at a given index in the coordIndex array, figure out
// how many vertices there are before either the end of the array
// or the next 'border' index
int getNumVerts(int startCoord);
// Setup for fast rendering. This should be called by subclasses,
// which can then use the textureI/colorI/normalI arrays (which
// will either point to one of the coordIndex arrays, or to a
// consective array of integers. This must be called AFTER the
// vpCache has been filled in.
void setupIndices(int numParts, int numFaces,
SbBool needNormals, SbBool needTexCoords);
// These must not be called unless setupIndices has been called first:
const int32_t * getNormalIndices()
{ return (normalI ? normalI : consecutiveIndices); }
const int32_t * getColorIndices()
{ return (colorI ? colorI : consecutiveIndices); }
const int32_t * getTexCoordIndices()
{ return (texCoordI ? texCoordI : consecutiveIndices); }
// Keep indices up to date if things change
virtual void notify(SoNotList *list);
virtual ~SoIndexedShape();
private:
// Internal routines used to allocate sequential indices so the
// same rendering loops can be used for indexed or non-indexed
// cases:
void allocateSequential(int howMany);
int32_t* allocateSequentialWithHoles();
// These are filled in by the setupIndices routine:
const int32_t *texCoordI;
const int32_t *colorI;
const int32_t *normalI;
static int32_t *consecutiveIndices;
static int numConsecutiveIndicesAllocated;
unsigned char materialBinding;
unsigned char normalBinding;
unsigned char texCoordBinding;
};
#endif /* _SO_INDEXED_SHAPE_ */
|
