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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
*/
/*
** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/nurbtess/gridWrap.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
*/
#ifndef _GRIDWRAP_H
#define _GRIDWRAP_H
#include <stdio.h>
#include "definitions.h"
#include "primitiveStream.h"
#include "zlassert.h"
class gridWrap{
Int n_ulines;
Int n_vlines;
Real u_min, u_max;
Real v_min, v_max;
/*cache the coordinate values for efficiency.
*these are redundant information when
*the grid is uniform.
*/
Real* u_values; /*size is n_ulines*/
Real* v_values; /*size is n_vlines*/
Int is_uniform;
public:
//uniform grid constructor
gridWrap(Int nUlines, Int nVlines,
Real uMin, Real uMax,
Real vMin, Real vMax
);
//nonuniform grid constructor.
gridWrap(Int nUlines, Real *uvals,
Int nVlines, Real *vvlas
);
~gridWrap();
void print();
Int get_n_ulines() {return n_ulines;}
Int get_n_vlines() {return n_vlines;}
Real get_u_min() {return u_min;}
Real get_u_max() {return u_max;}
Real get_v_min() {return v_min;}
Real get_v_max() {return v_max;}
Real get_u_value(Int i)
{
assert(i<n_ulines);
/*if(i>=n_ulines){printf("ERROR, n_ulines=%i,i=%i\n",n_ulines,i);exit(0);}*/
return u_values[i];}
Real get_v_value(Int j) {return v_values[j];}
Real* get_u_values() {return u_values;}
Real* get_v_values() {return v_values;}
void outputFanWithPoint(Int v, Int uleft, Int uright,
Real vert[2], primStream* pStream);
void draw();
Int isUniform() {return is_uniform;}
};
class gridBoundaryChain{
gridWrap* grid;
Int firstVlineIndex;
Int nVlines;
Int* ulineIndices; /*each v line has a boundary*/
Int* innerIndices; /*the segment of the vertical gridline from */
/*(innerIndices[i], i) to (innerIndices[i+1], i-1) */
/*is inside the polygon: i=1,...,nVlines-1*/
Real2* vertices; /*one grid point at each grid V-line, cached for efficiency*/
public:
gridBoundaryChain(gridWrap* gr, Int first_vline_index, Int n_vlines, Int* uline_indices, Int* inner_indices);
~gridBoundaryChain()
{
free(innerIndices);
free(ulineIndices);
free(vertices);
}
/*i indexes the vlines in this chain.
*/
Int getVlineIndex(Int i) {return firstVlineIndex-i;}
Int getUlineIndex(Int i) {return ulineIndices[i];}
Real get_u_value(Int i) {return vertices[i][0];}
Real get_v_value(Int i) {return vertices[i][1];}
Int get_nVlines() {return nVlines;}
Int getInnerIndex(Int i) {return innerIndices[i];}
Real getInner_u_value(Int i) {return grid->get_u_value(innerIndices[i]);}
Real* get_vertex(Int i) {return vertices[i];}
gridWrap* getGrid() {return grid;}
void leftEndFan(Int i, primStream* pStream);
void rightEndFan(Int i, primStream* pStream);
Int lookfor(Real v, Int i1, Int i2); //find i in [i1,i2] so that vertices[i][1]>= v > vertices[i+1][1]
void draw();
void drawInner();
};
#endif
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