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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.
**
*/
/*
*/
#ifndef _MONO_TRIANGULATION_H
#define _MONO_TRIANGULATION_H
#include "definitions.h"
#include "primitiveStream.h"
#include "directedLine.h"
#include "arc.h"
class Backend;
class reflexChain{
Real2 *queue;
/*the order of the polygon vertices: either q[0],q[1].., or
* q[n-1], q[n-2], ..., q[0]
*this order determines the interior of the polygon, so it
*also used to determines whether a chain is reflex or convex
*/
Int isIncreasing;
Int index_queue;
Int size_queue; /*allocated size*/
public:
reflexChain(Int size, Int isIncreasing);
~reflexChain();
void insert(Real u, Real v);
void insert(Real v[2]);
void processNewVertex(Real v[2], primStream* pStream);
void outputFan(Real v[2], primStream* pStream);
void processNewVertex(Real v[2], Backend* backend);
void outputFan(Real v[2], Backend* backend);
void print();
};
/*dynamic array of pointers to reals.
*Intended to store an array of (u,v).
*Notice that it doesn't allocate or dealocate the space
*for the (u,v) themselfs. So it assums that someone else
*is taking care of them, while this class only plays with
*the pointers.
*/
class vertexArray{
Real** array;
Int index;
Int size;
public:
vertexArray(Int s);
vertexArray(Real vertices[][2], Int nVertices);
~vertexArray();
void appendVertex(Real* ptr); /*the content (pointed by ptr is NOT copied*/
Real* getVertex(Int i) {return array[i];}
Real** getArray() {return array;}
Int getNumElements() {return index;}
Int findIndexAbove(Real v);
Int findIndexAboveGen(Real v, Int startIndex, Int EndIndex);
Int findIndexBelowGen(Real v, Int startIndex, Int EndIndex);
Int findIndexStrictBelowGen(Real v, Int startIndex, Int EndIndex);
Int findIndexFirstAboveEqualGen(Real v, Int startIndex, Int endIndex);
Int skipEqualityFromStart(Real v, Int start, Int end);
//return i such that fron [i+1, end] is strictly U-monotone (left to right
Int findDecreaseChainFromEnd(Int begin, Int end);
void print();
};
void monoTriangulation(directedLine* monoPolygon, primStream* pStream);
void monoTriangulationRec(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
primStream* pStream);
void monoTriangulationRec(directedLine* inc_chain, Int inc_index,
directedLine* dec_chain, Int dec_index,
directedLine* topVertex, Int top_index,
directedLine* botVertex,
primStream* pStream);
/*the chain could be increasing or decreasing, although we use the
* name inc_chain.
*the argument is_increase_chain indicates whether this chain
*is increasing (left chain in V-monotone case) or decreaing (right chain
*in V-monotone case).
*/
void monoTriangulation2(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_smallIndex,
Int inc_largeIndex,
Int is_increase_chain,
primStream* pStream);
void monoTriangulationRecGen(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void monoTriangulationRecGenOpt(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void triangulateXYMonoTB(Int n_left, Real** leftVerts,
Int n_right, Real** rightVerts,
primStream* pStream);
void monoTriangulationRecGenTBOpt(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
primStream* pStream);
void monoTriangulationRecOpt(Real* topVertex, Real* botVertex,
vertexArray* left_chain, Int left_current,
vertexArray* right_chain, Int right_current,
primStream* pStream);
void monoTriangulationRecFunGen(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current, Int inc_end,
vertexArray* dec_chain, Int dec_current, Int dec_end,
Int (*compFun)(Real*, Real*),
primStream* pStream);
void monoTriangulationRecFun(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Int (*compFun)(Real*, Real*),
primStream* pStream);
void monoTriangulationFun(directedLine* monoPolygon,
Int (*compFun)(Real*, Real*), primStream* pStream);
void monoTriangulationRec(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Backend* backend);
void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend);
void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex,
vertexArray* inc_chain, Int inc_current,
vertexArray* dec_chain, Int dec_current,
Int (*compFun)(Real*, Real*),
Backend* backend);
void monoTriangulationOpt(directedLine* poly, primStream* pStream);
#endif
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