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Diffstat (limited to 'src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h')
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1 files changed, 192 insertions, 0 deletions
diff --git a/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h b/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h new file mode 100644 index 00000000000..2b8f38226b6 --- /dev/null +++ b/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h @@ -0,0 +1,192 @@ +/* +** 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/monoTriangulation.h,v 1.1 2001/03/17 00:25:41 brianp Exp $ +*/ + +#ifndef _MONO_TRIANGULATION_H +#define _MONO_TRIANGULATION_H + +#include "definitions.h" +#include "primitiveStream.h" +#include "directedLine.h" + +class Backend; +class Arc; +typedef Arc *Arc_ptr; + +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 + + + + |