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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: 2004/03/14 08:29:11 $ $Revision: 1.1.1.4 $
+*/
+/*
+** $Header: /cvs/xorg/xc/extras/ogl-sample/main/gfx/lib/glu/libnurbs/nurbtess/sampleComp.cc,v 1.1.1.4 2004/03/14 08:29:11 eich Exp $
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "glimports.h"
+#include "sampleComp.h"
+#include "sampleCompTop.h"
+#include "sampleCompBot.h"
+#include "sampleCompRight.h"
+
+
+
+#define max(a,b) ((a>b)? a:b)
+#define min(a,b) ((a>b)? b:a)
+
+void sampleConnectedComp(Real* topVertex, Real* botVertex,
+ vertexArray* leftChain,
+ Int leftStartIndex, Int leftEndIndex,
+ vertexArray* rightChain,
+ Int rightStartIndex, Int rightEndIndex,
+ gridBoundaryChain* leftGridChain,
+ gridBoundaryChain* rightGridChain,
+ Int gridIndex1, Int gridIndex2,
+ Int up_leftCornerWhere,
+ Int up_leftCornerIndex,
+ Int up_rightCornerWhere,
+ Int up_rightCornerIndex,
+ Int down_leftCornerWhere,
+ Int down_leftCornerIndex,
+ Int down_rightCornerWhere,
+ Int down_rightCornerIndex,
+ primStream* pStream,
+ rectBlockArray* rbArray
+ )
+{
+
+ sampleCompLeft(topVertex, botVertex,
+ leftChain,
+ leftStartIndex, leftEndIndex,
+ rightChain,
+ rightStartIndex, rightEndIndex,
+ leftGridChain,
+ gridIndex1,
+ gridIndex2,
+ up_leftCornerWhere,
+ up_leftCornerIndex,
+ down_leftCornerWhere,
+ down_leftCornerIndex,
+ pStream);
+
+
+ sampleCompRight(topVertex, botVertex,
+ leftChain,
+ leftStartIndex, leftEndIndex,
+ rightChain,
+ rightStartIndex,
+ rightEndIndex,
+ rightGridChain,
+ gridIndex1, gridIndex2,
+ up_rightCornerWhere,
+ up_rightCornerIndex,
+ down_rightCornerWhere,
+ down_rightCornerIndex,
+ pStream);
+
+
+ sampleCompTop(topVertex,
+ leftChain,
+ leftStartIndex,
+ rightChain,
+ rightStartIndex,
+ leftGridChain,
+ rightGridChain,
+ gridIndex1,
+ up_leftCornerWhere,
+ up_leftCornerIndex,
+ up_rightCornerWhere,
+ up_rightCornerIndex,
+ pStream);
+
+ sampleCompBot(botVertex,
+ leftChain,
+ leftEndIndex,
+ rightChain,
+ rightEndIndex,
+ leftGridChain,
+ rightGridChain,
+ gridIndex2,
+ down_leftCornerWhere,
+ down_leftCornerIndex,
+ down_rightCornerWhere,
+ down_rightCornerIndex,
+ pStream);
+
+
+ //the center
+
+ rbArray->insert(new rectBlock(leftGridChain, rightGridChain, gridIndex1, gridIndex2));
+
+
+}
+
+/*notice that we need rightChain because the
+ *corners could be on the rightChain.
+ *here comp means component.
+ */
+void sampleCompLeft(Real* topVertex, Real* botVertex,
+ vertexArray* leftChain,
+ Int leftStartIndex, Int leftEndIndex,
+ vertexArray* rightChain,
+ Int rightStartIndex, Int rightEndIndex,
+ gridBoundaryChain* leftGridChain,
+ Int gridIndex1, Int gridIndex2,
+ Int up_leftCornerWhere,
+ Int up_leftCornerIndex,
+ Int down_leftCornerWhere,
+ Int down_leftCornerIndex,
+ primStream* pStream)
+{
+ /*find out whether there is a trim vertex which is
+ *inbetween the top and bot grid lines or not.
+ */
+ Int midIndex1;
+ Int midIndex2;
+ Int gridMidIndex1, gridMidIndex2;
+ //midIndex1: array[i] <= v, array[i-1] > v
+ //midIndex2: array[i] >= v, array[i+1] < v
+ // v(gridMidIndex1) >= v(midindex1) > v(gridMidIndex1+1)
+ // v(gridMidIndex2-1) >= v(midIndex2) > v(gridMidIndex2) ??
+ midIndex1 = leftChain->findIndexBelowGen(
+ leftGridChain->get_v_value(gridIndex1),
+ leftStartIndex,
+ leftEndIndex);
+
+ midIndex2 = -1; /*initilization*/
+ if(midIndex1<= leftEndIndex && gridIndex1<gridIndex2)
+ if(leftChain->getVertex(midIndex1)[1] >= leftGridChain->get_v_value(gridIndex2))
+ {
+ midIndex2 = leftChain->findIndexAboveGen(
+ leftGridChain->get_v_value(gridIndex2),
+ midIndex1, //midIndex1 <= midIndex2.
+ leftEndIndex);
+ gridMidIndex1 = leftGridChain->lookfor(leftChain->getVertex(midIndex1)[1],
+ gridIndex1, gridIndex2);
+ gridMidIndex2 = 1+leftGridChain->lookfor(leftChain->getVertex(midIndex2)[1],
+ gridMidIndex1, gridIndex2);
+ }
+
+
+ /*to interprete the corner information*/
+ Real* cornerTop;
+ Real* cornerBot;
+ Int cornerLeftStart;
+ Int cornerLeftEnd;
+ Int cornerRightUpEnd;
+ Int cornerRightDownStart;
+ if(up_leftCornerWhere == 0) /*left corner is on left chain*/
+ {
+ cornerTop = leftChain->getVertex(up_leftCornerIndex);
+ cornerLeftStart = up_leftCornerIndex+1;
+ cornerRightUpEnd = -1; /*no right*/
+ }
+ else if(up_leftCornerWhere == 1) /*left corner is on top*/
+ {
+ cornerTop = topVertex;
+ cornerLeftStart = leftStartIndex;
+ cornerRightUpEnd = -1; /*no right*/
+ }
+ else /*left corner is on right chain*/
+ {
+ cornerTop = topVertex;
+ cornerLeftStart = leftStartIndex;
+ cornerRightUpEnd = up_leftCornerIndex;
+ }
+
+ if(down_leftCornerWhere == 0) /*left corner is on left chain*/
+ {
+ cornerBot = leftChain->getVertex(down_leftCornerIndex);
+ cornerLeftEnd = down_leftCornerIndex-1;
+ cornerRightDownStart = rightEndIndex+1; /*no right*/
+ }
+ else if(down_leftCornerWhere == 1) /*left corner is on bot*/
+ {
+ cornerBot = botVertex;
+ cornerLeftEnd = leftEndIndex;
+ cornerRightDownStart = rightEndIndex+1; /*no right*/
+ }
+ else /*left corner is on the right chian*/
+ {
+ cornerBot = botVertex;
+ cornerLeftEnd = leftEndIndex;
+ cornerRightDownStart = down_leftCornerIndex;
+ }
+
+
+
+
+ /*sample*/
+ if(midIndex2 >= 0) /*there is a trim point inbewteen grid lines*/
+ {
+
+ sampleLeftSingleTrimEdgeRegionGen(cornerTop, leftChain->getVertex(midIndex1),
+ leftChain,
+ cornerLeftStart,
+ midIndex1-1,
+ leftGridChain,
+ gridIndex1,
+ gridMidIndex1,
+ rightChain,
+ rightStartIndex,
+ cornerRightUpEnd,
+ 0, //no right down section
+ -1,
+ pStream);
+
+ sampleLeftSingleTrimEdgeRegionGen(leftChain->getVertex(midIndex2),
+ cornerBot,
+ leftChain,
+ midIndex2+1,
+ cornerLeftEnd,
+ leftGridChain,
+ gridMidIndex2,
+ gridIndex2,
+ rightChain,
+ 0, //no right up section
+ -1,
+ cornerRightDownStart,
+ rightEndIndex,
+ pStream);
+
+
+ sampleLeftStripRecF(leftChain,
+ midIndex1,
+ midIndex2,
+ leftGridChain,
+ gridMidIndex1,
+ gridMidIndex2,
+ pStream);
+ }
+ else
+ {
+ sampleLeftSingleTrimEdgeRegionGen(cornerTop, cornerBot,
+ leftChain,
+ cornerLeftStart,
+ cornerLeftEnd,
+ leftGridChain,
+ gridIndex1,
+ gridIndex2,
+ rightChain,
+ rightStartIndex,
+ cornerRightUpEnd,
+ cornerRightDownStart,
+ rightEndIndex,
+ pStream);
+ }
+}
+
+void sampleLeftSingleTrimEdgeRegionGen(Real topVert[2], Real botVert[2],
+ vertexArray* leftChain,
+ Int leftStart,
+ Int leftEnd,
+ gridBoundaryChain* gridChain,
+ Int gridBeginIndex,
+ Int gridEndIndex,
+ vertexArray* rightChain,
+ Int rightUpBegin,
+ Int rightUpEnd,
+ Int rightDownBegin,
+ Int rightDownEnd,
+ primStream* pStream)
+{
+ Int i,j,k;
+
+ /*creat an array to store all the up and down secments of the right chain,
+ *and the left end grid points
+ *
+ *although vertex array is a dynamic array, but to gain efficiency,
+ *it is better to initiliza the exact array size
+ */
+ vertexArray vArray(gridEndIndex-gridBeginIndex+1 +
+ max(0,rightUpEnd - rightUpBegin+1)+
+ max(0,rightDownEnd - rightDownBegin+1));
+
+ /*append the vertices on the up section of thr right chain*/
+ for(i=rightUpBegin; i<= rightUpEnd; i++)
+ vArray.appendVertex(rightChain->getVertex(i));
+
+ /*append the vertices of the left extremal grid points,
+ *and at the same time, perform triangulation for the stair cases
+ */
+ vArray.appendVertex(gridChain->get_vertex(gridBeginIndex));
+
+ for(k=1, i=gridBeginIndex+1; i<=gridEndIndex; i++, k++)
+ {
+ vArray.appendVertex(gridChain->get_vertex(i));
+
+ /*output the fan of the grid points of the (i)th and (i-1)th grid line.
+ */
+ if(gridChain->getUlineIndex(i) < gridChain->getUlineIndex(i-1))
+ {
+ pStream->begin();
+ pStream->insert(gridChain->get_vertex(i-1));
+ for(j=gridChain->getUlineIndex(i); j<= gridChain->getUlineIndex(i-1); j++)
+ pStream->insert(gridChain->getGrid()->get_u_value(j), gridChain->get_v_value(i));
+ pStream->end(PRIMITIVE_STREAM_FAN);
+ }
+ else if(gridChain->getUlineIndex(i) > gridChain->getUlineIndex(i-1))
+ {
+ pStream->begin();
+ pStream->insert(gridChain->get_vertex(i));
+ for(j=gridChain->getUlineIndex(i); j>= gridChain->getUlineIndex(i-1); j--)
+ pStream->insert(gridChain->getGrid()->get_u_value(j), gridChain->get_v_value(i-1));
+ pStream->end(PRIMITIVE_STREAM_FAN);
+ }
+ /*otherwisem, the two are equal, so there is no fan to outout*/
+ }
+
+ /*then append all the vertices on the down section of the right chain*/
+ for(i=rightDownBegin; i<= rightDownEnd; i++)
+ vArray.appendVertex(rightChain->getVertex(i));
+
+ monoTriangulationRecGen(topVert, botVert,
+ leftChain, leftStart, leftEnd,
+ &vArray, 0, vArray.getNumElements()-1,
+ pStream);
+
+}
+
+
+
+
+
+
+
+
+
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