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Diffstat (limited to 'mesalib/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h')
| -rw-r--r-- | mesalib/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/mesalib/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h b/mesalib/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h new file mode 100644 index 000000000..f78b8f402 --- /dev/null +++ b/mesalib/src/glu/sgi/libnurbs/nurbtess/monoTriangulation.h @@ -0,0 +1,184 @@ +/* + * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) + * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice including the dates of first publication and + * either this permission notice or a reference to + * http://oss.sgi.com/projects/FreeB/ + * shall be included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF + * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Except as contained in this notice, the name of Silicon Graphics, Inc. + * shall not be used in advertising or otherwise to promote the sale, use or + * other dealings in this Software without prior written authorization from + * Silicon Graphics, Inc. + */ +/* +*/ + +#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 + + + + |