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diff --git a/src/glu/sgi/libnurbs/internals/slicer.cc b/src/glu/sgi/libnurbs/internals/slicer.cc
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+++ b/src/glu/sgi/libnurbs/internals/slicer.cc
@@ -0,0 +1,1287 @@
+/*
+** 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.
+*/
+
+/*
+ * slicer.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/slicer.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "bufpool.h"
+#include "slicer.h"
+#include "backend.h"
+#include "arc.h"
+#include "gridtrimvertex.h"
+#include "trimvertex.h"
+#include "varray.h"
+
+#include "polyUtil.h" //for area()
+
+//static int count=0;
+
+/*USE_OPTTT is initiated in trimvertex.h*/
+
+#ifdef USE_OPTTT
+ #include <GL/gl.h>
+#endif
+
+//#define USE_READ_FLAG //whether to use new or old tesselator
+ //if defined, it reads "flagFile",
+ // if the number is 1, then use new tess
+ // otherwise, use the old tess.
+ //if not defined, then use new tess.
+#ifdef USE_READ_FLAG
+static Int read_flag(char* name);
+Int newtess_flag = read_flag("flagFile");
+#endif
+
+//#define COUNT_TRIANGLES
+#ifdef COUNT_TRIANGLES
+Int num_triangles = 0;
+Int num_quads = 0;
+#endif
+
+#define max(a,b) ((a>b)? a:b)
+#define ZERO 0.00001 /*determing whether a loop is a rectngle or not*/
+#define equalRect(a,b) ((fabs(a-b) <= ZERO)? 1:0) //only used in tessellating a rectangle
+
+static Int is_Convex(Arc_ptr loop)
+{
+ if(area(loop->tail(), loop->head(), loop->next->head()) <0 )
+ return 0;
+ for(Arc_ptr jarc = loop->next; jarc != loop; jarc = jarc->next)
+ {
+ if(area(jarc->tail(), jarc->head(), jarc->next->head()) < 0)
+ return 0;
+ }
+ return 1;
+}
+
+/******triangulate a monotone polygon**************/
+#include "monoTriangulation.h"
+static int is_U_monotone(Arc_ptr loop)
+{
+ int n_changes=0;
+ int prev_sign;
+ int cur_sign;
+ Arc_ptr temp;
+
+ cur_sign = compV2InX(loop->head(), loop->tail());
+
+ n_changes = (compV2InX(loop->prev->head(), loop->prev->tail())
+ != cur_sign);
+
+ for(temp=loop->next; temp != loop; temp = temp->next)
+ {
+ prev_sign = cur_sign;
+ cur_sign = compV2InX(temp->head(), temp->tail());
+ if(cur_sign != prev_sign)
+ {
+#ifdef DEBUG
+ printf("***change signe\n");
+#endif
+ n_changes++;
+ }
+ }
+ if(n_changes == 2) return 1;
+ else
+ return 0;
+}
+
+inline int compInY(REAL a[2], REAL b[2])
+{
+ if(a[1] < b[1])
+ return -1;
+ else if (a[1] > b[1])
+ return 1;
+ else if(a[0] > b[0])
+ return 1;
+ else return -1;
+}
+
+void monoTriangulationLoop(Arc_ptr loop, Backend& backend, primStream* pStream)
+{
+ int i;
+ //find the top, bottom, increasing and decreasing chain
+ //then call monoTrianulation
+ Arc_ptr jarc, temp;
+ Arc_ptr top;
+ Arc_ptr bot;
+ top = bot = loop;
+ if(compInY(loop->tail(), loop->prev->tail()) < 0)
+ {
+ //first find bot
+ for(temp = loop->next; temp != loop; temp = temp->next)
+ {
+ if(compInY(temp->tail(), temp->prev->tail()) > 0)
+ break;
+ }
+ bot = temp->prev;
+ //then find top
+ for(temp=loop->prev; temp != loop; temp = temp->prev)
+ {
+ if(compInY(temp->tail(), temp->prev->tail()) > 0)
+ break;
+ }
+ top = temp;
+ }
+ else //loop > loop->prev
+ {
+ for(temp=loop->next; temp != loop; temp = temp->next)
+ {
+ if(compInY(temp->tail(), temp->prev->tail()) < 0)
+ break;
+ }
+ top = temp->prev;
+ for(temp=loop->prev; temp != loop; temp = temp->prev)
+ {
+ if(compInY(temp->tail(), temp->prev->tail()) < 0)
+ break;
+ }
+ bot = temp;
+ }
+ //creat increase and decrease chains
+ vertexArray inc_chain(50); //this is a dynamci array
+ for(i=1; i<=top->pwlArc->npts-2; i++)
+ {
+ //the first vertex is the top which doesn't below to inc_chain
+ inc_chain.appendVertex(top->pwlArc->pts[i].param);
+ }
+ for(jarc=top->next; jarc != bot; jarc = jarc->next)
+ {
+ for(i=0; i<=jarc->pwlArc->npts-2; i++)
+ {
+ inc_chain.appendVertex(jarc->pwlArc->pts[i].param);
+ }
+
+ }
+ vertexArray dec_chain(50);
+ for(jarc = top->prev; jarc != bot; jarc = jarc->prev)
+ {
+ for(i=jarc->pwlArc->npts-2; i>=0; i--)
+ {
+ dec_chain.appendVertex(jarc->pwlArc->pts[i].param);
+ }
+ }
+ for(i=bot->pwlArc->npts-2; i>=1; i--)
+ {
+ dec_chain.appendVertex(jarc->pwlArc->pts[i].param);
+ }
+
+ monoTriangulationRec(top->tail(), bot->tail(), &inc_chain, 0,
+ &dec_chain, 0, &backend);
+
+}
+
+/********tesselate a rectanlge (OPTIMIZATION**************/
+static void triangulateRectGen(Arc_ptr loop, int n_ulines, int n_vlines, Backend& backend);
+
+static Int is_rect(Arc_ptr loop)
+{
+ Int nlines =1;
+ for(Arc_ptr jarc = loop->next; jarc != loop; jarc = jarc->next)
+ {
+ nlines++;
+ if(nlines == 5)
+ break;
+ }
+ if(nlines != 4)
+ return 0;
+
+
+/*
+printf("here1\n");
+printf("loop->tail=(%f,%f)\n", loop->tail()[0], loop->tail()[1]);
+printf("loop->head=(%f,%f)\n", loop->head()[0], loop->head()[1]);
+printf("loop->next->tail=(%f,%f)\n", loop->next->tail()[0], loop->next->tail()[1]);
+printf("loop->next->head=(%f,%f)\n", loop->next->head()[0], loop->next->head()[1]);
+if(fabs(loop->tail()[0] - loop->head()[0])<0.000001)
+ printf("equal 1\n");
+if(loop->next->tail()[1] == loop->next->head()[1])
+ printf("equal 2\n");
+*/
+
+ if( (fabs(loop->tail()[0] - loop->head()[0])<=ZERO) &&
+ (fabs(loop->next->tail()[1] - loop->next->head()[1])<=ZERO) &&
+ (fabs(loop->prev->tail()[1] - loop->prev->head()[1])<=ZERO) &&
+ (fabs(loop->prev->prev->tail()[0] - loop->prev->prev->head()[0])<=ZERO)
+ )
+ return 1;
+ else if
+ ( (fabs(loop->tail()[1] - loop->head()[1]) <= ZERO) &&
+ (fabs(loop->next->tail()[0] - loop->next->head()[0]) <= ZERO) &&
+ (fabs(loop->prev->tail()[0] - loop->prev->head()[0]) <= ZERO) &&
+ (fabs(loop->prev->prev->tail()[1] - loop->prev->prev->head()[1]) <= ZERO)
+ )
+ return 1;
+ else
+ return 0;
+}
+
+
+//a line with the same u for opt
+static void evalLineNOGE_BU(TrimVertex *verts, int n, Backend& backend)
+{
+ int i;
+ backend.preEvaluateBU(verts[0].param[0]);
+ for(i=0; i<n; i++)
+ backend.tmeshvertNOGE_BU(&verts[i]);
+}
+
+//a line with the same v for opt
+static void evalLineNOGE_BV(TrimVertex *verts, int n, Backend& backend)
+{
+ int i;
+ backend.preEvaluateBV(verts[0].param[1]);
+
+ for(i=0; i<n; i++)
+ backend.tmeshvertNOGE_BV(&verts[i]);
+}
+static void evalLineNOGE(TrimVertex *verts, int n, Backend& backend)
+{
+
+ if(verts[0].param[0] == verts[n-1].param[0]) //all u;s are equal
+ evalLineNOGE_BU(verts, n, backend);
+ else if(verts[0].param[1] == verts[n-1].param[1]) //all v's are equal
+ evalLineNOGE_BV(verts, n, backend);
+ else
+ {
+ int i;
+ for(i=0; i<n; i++)
+ backend.tmeshvertNOGE(&verts[i]);
+ }
+}
+
+
+inline void OPT_OUTVERT(TrimVertex& vv, Backend& backend)
+{
+
+#ifdef USE_OPTTT
+ glNormal3fv(vv.cache_normal);
+ glVertex3fv(vv.cache_point);
+#else
+
+ backend.tmeshvert(&vv);
+
+#endif
+
+}
+
+static void triangulateRectAux(PwlArc* top, PwlArc* bot, PwlArc* left, PwlArc* right, Backend& backend);
+
+static void triangulateRect(Arc_ptr loop, Backend& backend, int TB_or_LR, int ulinear, int vlinear)
+{
+ int i;
+ //we know the loop is a rectangle, but not sure which is top
+ Arc_ptr top, bot, left, right;
+ if(loop->tail()[1] == loop->head()[1])
+ {
+ if(loop->tail()[1] > loop->prev->prev->tail()[1])
+ {
+
+ top = loop;
+ }
+ else{
+
+ top = loop->prev->prev;
+ }
+ }
+ else
+ {
+ if(loop->tail()[0] > loop->prev->prev->tail()[0])
+ {
+ //loop is the right arc
+
+ top = loop->next;
+ }
+ else
+ {
+
+ top = loop->prev;
+ }
+ }
+ left = top->next;
+ bot = left->next;
+ right= bot->next;
+
+ //if u, v are both nonlinear, then if the
+ //boundary is tessellated dense, we also
+ //sample the inside to get a better tesslletant.
+ if( (!ulinear) && (!vlinear))
+ {
+ int nu = top->pwlArc->npts;
+ if(nu < bot->pwlArc->npts)
+ nu = bot->pwlArc->npts;
+ int nv = left->pwlArc->npts;
+ if(nv < right->pwlArc->npts)
+ nv = right->pwlArc->npts;
+/*
+ if(nu > 2 && nv > 2)
+ {
+ triangulateRectGen(top, nu-2, nv-2, backend);
+ return;
+ }
+*/
+ }
+
+ if(TB_or_LR == 1)
+ triangulateRectAux(top->pwlArc, bot->pwlArc, left->pwlArc, right->pwlArc, backend);
+ else if(TB_or_LR == -1)
+ triangulateRectAux(left->pwlArc, right->pwlArc, bot->pwlArc, top->pwlArc, backend);
+ else
+ {
+ Int maxPointsTB = top->pwlArc->npts + bot->pwlArc->npts;
+ Int maxPointsLR = left->pwlArc->npts + right->pwlArc->npts;
+
+ if(maxPointsTB < maxPointsLR)
+ triangulateRectAux(left->pwlArc, right->pwlArc, bot->pwlArc, top->pwlArc, backend);
+ else
+ triangulateRectAux(top->pwlArc, bot->pwlArc, left->pwlArc, right->pwlArc, backend);
+ }
+}
+
+static void triangulateRectAux(PwlArc* top, PwlArc* bot, PwlArc* left, PwlArc* right, Backend& backend)
+{ //if(maxPointsTB >= maxPointsLR)
+ {
+
+ Int d, topd_left, topd_right, botd_left, botd_right, i,j;
+ d = left->npts /2;
+
+#ifdef USE_OPTTT
+ evalLineNOGE(top->pts, top->npts, backend);
+ evalLineNOGE(bot->pts, bot->npts, backend);
+ evalLineNOGE(left->pts, left->npts, backend);
+ evalLineNOGE(right->pts, right->npts, backend);
+#endif
+
+ if(top->npts == 2) {
+ backend.bgntfan();
+ OPT_OUTVERT(top->pts[0], backend);//the root
+ for(i=0; i<left->npts; i++){
+ OPT_OUTVERT(left->pts[i], backend);
+ }
+ for(i=1; i<= bot->npts-2; i++){
+ OPT_OUTVERT(bot->pts[i], backend);
+ }
+ backend.endtfan();
+
+ backend.bgntfan();
+ OPT_OUTVERT(bot->pts[bot->npts-2], backend);
+ for(i=0; i<right->npts; i++){
+ OPT_OUTVERT(right->pts[i], backend);
+ }
+ backend.endtfan();
+ }
+ else if(bot->npts == 2) {
+ backend.bgntfan();
+ OPT_OUTVERT(bot->pts[0], backend);//the root
+ for(i=0; i<right->npts; i++){
+ OPT_OUTVERT(right->pts[i], backend);
+ }
+ for(i=1; i<= top->npts-2; i++){
+ OPT_OUTVERT(top->pts[i], backend);
+ }
+ backend.endtfan();
+
+ backend.bgntfan();
+ OPT_OUTVERT(top->pts[top->npts-2], backend);
+ for(i=0; i<left->npts; i++){
+ OPT_OUTVERT(left->pts[i], backend);
+ }
+ backend.endtfan();
+ }
+ else { //both top and bot have >=3 points
+
+ backend.bgntfan();
+
+ OPT_OUTVERT(top->pts[top->npts-2], backend);
+
+ for(i=0; i<=d; i++)
+ {
+ OPT_OUTVERT(left->pts[i], backend);
+ }
+ backend.endtfan();
+
+ backend.bgntfan();
+
+ OPT_OUTVERT(bot->pts[1], backend);
+
+ OPT_OUTVERT(top->pts[top->npts-2], backend);
+
+ for(i=d; i< left->npts; i++)
+ {
+ OPT_OUTVERT(left->pts[i], backend);
+ }
+ backend.endtfan();
+
+ d = right->npts/2;
+ //output only when d<right->npts-1 and
+ //
+ if(d<right->npts-1)
+ {
+ backend.bgntfan();
+ // backend.tmeshvert(& top->pts[1]);
+ OPT_OUTVERT(top->pts[1], backend);
+ for(i=d; i< right->npts; i++)
+ {
+ // backend.tmeshvert(& right->pts[i]);
+
+ OPT_OUTVERT(right->pts[i], backend);
+
+ }
+ backend.endtfan();
+ }
+
+ backend.bgntfan();
+ // backend.tmeshvert(& bot->pts[bot->npts-2]);
+ OPT_OUTVERT( bot->pts[bot->npts-2], backend);
+ for(i=0; i<=d; i++)
+ {
+ // backend.tmeshvert(& right->pts[i]);
+ OPT_OUTVERT(right->pts[i], backend);
+
+ }
+
+ // backend.tmeshvert(& top->pts[1]);
+ OPT_OUTVERT(top->pts[1], backend);
+
+ backend.endtfan();
+
+
+ topd_left = top->npts-2;
+ topd_right = 1; //topd_left>= topd_right
+
+ botd_left = 1;
+ botd_right = bot->npts-2; //botd_left<= bot_dright
+
+
+ if(top->npts < bot->npts)
+ {
+ int delta=bot->npts - top->npts;
+ int u = delta/2;
+ botd_left = 1+ u;
+ botd_right = bot->npts-2-( delta-u);
+
+ if(botd_left >1)
+ {
+ backend.bgntfan();
+ // backend.tmeshvert(& top->pts[top->npts-2]);
+ OPT_OUTVERT(top->pts[top->npts-2], backend);
+ for(i=1; i<= botd_left; i++)
+ {
+ // backend.tmeshvert(& bot->pts[i]);
+ OPT_OUTVERT(bot->pts[i] , backend);
+ }
+ backend.endtfan();
+ }
+ if(botd_right < bot->npts-2)
+ {
+ backend.bgntfan();
+ OPT_OUTVERT(top->pts[1], backend);
+ for(i=botd_right; i<= bot->npts-2; i++)
+ OPT_OUTVERT(bot->pts[i], backend);
+ backend.endtfan();
+ }
+ }
+ else if(top->npts> bot->npts)
+ {
+ int delta=top->npts-bot->npts;
+ int u = delta/2;
+ topd_left = top->npts-2 - u;
+ topd_right = 1+delta-u;
+
+ if(topd_left < top->npts-2)
+ {
+ backend.bgntfan();
+ // backend.tmeshvert(& bot->pts[1]);
+ OPT_OUTVERT(bot->pts[1], backend);
+ for(i=topd_left; i<= top->npts-2; i++)
+ {
+ // backend.tmeshvert(& top->pts[i]);
+ OPT_OUTVERT(top->pts[i], backend);
+ }
+ backend.endtfan();
+ }
+ if(topd_right > 1)
+ {
+ backend.bgntfan();
+ OPT_OUTVERT(bot->pts[bot->npts-2], backend);
+ for(i=1; i<= topd_right; i++)
+ OPT_OUTVERT(top->pts[i], backend);
+ backend.endtfan();
+ }
+ }
+
+ if(topd_left <= topd_right)
+ return;
+
+ backend.bgnqstrip();
+ for(j=botd_left, i=topd_left; i>=topd_right; i--,j++)
+ {
+ // backend.tmeshvert(& top->pts[i]);
+ // backend.tmeshvert(& bot->pts[j]);
+ OPT_OUTVERT(top->pts[i], backend);
+ OPT_OUTVERT(bot->pts[j], backend);
+ }
+ backend.endqstrip();
+
+ }
+ }
+}
+
+
+static void triangulateRectCenter(int n_ulines, REAL* u_val,
+ int n_vlines, REAL* v_val,
+ Backend& backend)
+{
+ TrimVertex trimVert;
+ trimVert.nuid = 0;//????
+
+ backend.surfgrid(u_val[0], u_val[n_ulines-1], n_ulines-1,
+ v_val[n_vlines-1], v_val[0], n_vlines-1);
+
+ if(n_ulines>1 && n_vlines>1)
+ backend.surfmesh(0,0,n_ulines-1,n_vlines-1);
+
+ return;
+
+ /*
+ for(i=0; i<n_vlines-1; i++)
+ {
+
+ backend.bgnqstrip();
+ for(j=0; j<n_ulines; j++)
+ {
+ trimVert.param[0] = u_val[j];
+ trimVert.param[1] = v_val[i+1];
+ backend.tmeshvert(& trimVert);
+
+ trimVert.param[1] = v_val[i];
+ backend.tmeshvert(& trimVert);
+ }
+ backend.endqstrip();
+
+ }
+ */
+}
+
+//it works for top, bot, left ad right, you need ot select correct arguments
+static void triangulateRectTopGen(Arc_ptr arc, int n_ulines, REAL* u_val, Real v, int dir, int is_u, Backend& backend)
+{
+
+ if(is_u)
+ {
+ int i,k;
+ REAL* upper_val = (REAL*) malloc(sizeof(REAL) * arc->pwlArc->npts);
+ assert(upper_val);
+ if(dir)
+ {
+ for(k=0,i=arc->pwlArc->npts-1; i>=0; i--,k++)
+ {
+ upper_val[k] = arc->pwlArc->pts[i].param[0];
+ }
+ backend.evalUStrip(arc->pwlArc->npts, arc->pwlArc->pts[0].param[1],
+ upper_val,
+ n_ulines, v, u_val);
+ }
+ else
+ {
+ for(k=0,i=0; i<arc->pwlArc->npts; i++,k++)
+ {
+ upper_val[k] = arc->pwlArc->pts[i].param[0];
+
+ }
+
+ backend.evalUStrip(
+ n_ulines, v, u_val,
+ arc->pwlArc->npts, arc->pwlArc->pts[0].param[1], upper_val
+ );
+ }
+
+ free(upper_val);
+ return;
+ }
+ else //is_v
+ {
+ int i,k;
+ REAL* left_val = (REAL*) malloc(sizeof(REAL) * arc->pwlArc->npts);
+ assert(left_val);
+ if(dir)
+ {
+ for(k=0,i=arc->pwlArc->npts-1; i>=0; i--,k++)
+ {
+ left_val[k] = arc->pwlArc->pts[i].param[1];
+ }
+ backend.evalVStrip(arc->pwlArc->npts, arc->pwlArc->pts[0].param[0],
+ left_val,
+ n_ulines, v, u_val);
+ }
+ else
+ {
+ for(k=0,i=0; i<arc->pwlArc->npts; i++,k++)
+ {
+ left_val[k] = arc->pwlArc->pts[i].param[1];
+ }
+ backend.evalVStrip(
+ n_ulines, v, u_val,
+ arc->pwlArc->npts, arc->pwlArc->pts[0].param[0], left_val
+ );
+ }
+ free(left_val);
+ return;
+ }
+
+ //the following is a different version of the above code. If you comment
+ //the above code, the following code will still work. The reason to leave
+ //the folliwng code here is purely for testing purpose.
+ /*
+ int i,j;
+ PwlArc* parc = arc->pwlArc;
+ int d1 = parc->npts-1;
+ int d2 = 0;
+ TrimVertex trimVert;
+ trimVert.nuid = 0;//????
+ REAL* temp_u_val = u_val;
+ if(dir ==0) //have to reverse u_val
+ {
+ temp_u_val = (REAL*) malloc(sizeof(REAL) * n_ulines);
+ assert(temp_u_val);
+ for(i=0; i<n_ulines; i++)
+ temp_u_val[i] = u_val[n_ulines-1-i];
+ }
+ u_val = temp_u_val;
+
+ if(parc->npts > n_ulines)
+ {
+ d1 = n_ulines-1;
+
+ backend.bgntfan();
+ if(is_u){
+ trimVert.param[0] = u_val[0];
+ trimVert.param[1] = v;
+ }
+ else
+ {
+ trimVert.param[1] = u_val[0];
+ trimVert.param[0] = v;
+ }
+
+ backend.tmeshvert(& trimVert);
+ for(i=d1; i< parc->npts; i++)
+ backend.tmeshvert(& parc->pts[i]);
+ backend.endtfan();
+
+
+ }
+ else if(parc->npts < n_ulines)
+ {
+ d2 = n_ulines-parc->npts;
+
+
+ backend.bgntfan();
+ backend.tmeshvert(& parc->pts[parc->npts-1]);
+ for(i=0; i<= d2; i++)
+ {
+ if(is_u){
+ trimVert.param[0] = u_val[i];
+ trimVert.param[1] = v;
+ }
+ else
+ {
+ trimVert.param[1] = u_val[i];
+ trimVert.param[0] = v;
+ }
+ backend.tmeshvert(&trimVert);
+ }
+ backend.endtfan();
+
+ }
+ if(d1>0){
+
+
+ backend.bgnqstrip();
+ for(i=d1, j=d2; i>=0; i--, j++)
+ {
+ backend.tmeshvert(& parc->pts[i]);
+
+ if(is_u){
+ trimVert.param[0] = u_val[j];
+ trimVert.param[1] = v;
+ }
+ else{
+ trimVert.param[1] = u_val[j];
+ trimVert.param[0] = v;
+ }
+ backend.tmeshvert(&trimVert);
+
+
+
+ }
+ backend.endqstrip();
+
+
+ }
+ if(dir == 0) //temp_u_val was mallocated
+ free(temp_u_val);
+ */
+}
+
+//n_ulines is the number of ulines inside, and n_vlines is the number of vlines
+//inside, different from meanings elsewhere!!!
+static void triangulateRectGen(Arc_ptr loop, int n_ulines, int n_vlines, Backend& backend)
+{
+
+ int i;
+ //we know the loop is a rectangle, but not sure which is top
+ Arc_ptr top, bot, left, right;
+
+ if(equalRect(loop->tail()[1] , loop->head()[1]))
+ {
+
+ if(loop->tail()[1] > loop->prev->prev->tail()[1])
+ {
+
+ top = loop;
+ }
+ else{
+
+ top = loop->prev->prev;
+ }
+ }
+ else
+ {
+ if(loop->tail()[0] > loop->prev->prev->tail()[0])
+ {
+ //loop is the right arc
+
+ top = loop->next;
+ }
+ else
+ {
+
+ top = loop->prev;
+ }
+ }
+
+ left = top->next;
+ bot = left->next;
+ right= bot->next;
+
+#ifdef COUNT_TRIANGLES
+ num_triangles += loop->pwlArc->npts +
+ left->pwlArc->npts +
+ bot->pwlArc->npts +
+ right->pwlArc->npts
+ + 2*n_ulines + 2*n_vlines
+ -8;
+ num_quads += (n_ulines-1)*(n_vlines-1);
+#endif
+/*
+ backend.surfgrid(left->tail()[0], right->tail()[0], n_ulines+1,
+ top->tail()[1], bot->tail()[1], n_vlines+1);
+// if(n_ulines>1 && n_vlines>1)
+ backend.surfmesh(0,0,n_ulines+1,n_vlines+1);
+return;
+*/
+ REAL* u_val=(REAL*) malloc(sizeof(REAL)*n_ulines);
+ assert(u_val);
+ REAL* v_val=(REAL*)malloc(sizeof(REAL) * n_vlines);
+ assert(v_val);
+ REAL u_stepsize = (right->tail()[0] - left->tail()[0])/( (REAL) n_ulines+1);
+ REAL v_stepsize = (top->tail()[1] - bot->tail()[1])/( (REAL) n_vlines+1);
+ Real temp=left->tail()[0]+u_stepsize;
+ for(i=0; i<n_ulines; i++)
+ {
+ u_val[i] = temp;
+ temp += u_stepsize;
+ }
+ temp = bot->tail()[1] + v_stepsize;
+ for(i=0; i<n_vlines; i++)
+ {
+ v_val[i] = temp;
+ temp += v_stepsize;
+ }
+
+ triangulateRectTopGen(top, n_ulines, u_val, v_val[n_vlines-1], 1,1, backend);
+ triangulateRectTopGen(bot, n_ulines, u_val, v_val[0], 0, 1, backend);
+ triangulateRectTopGen(left, n_vlines, v_val, u_val[0], 1, 0, backend);
+ triangulateRectTopGen(right, n_vlines, v_val, u_val[n_ulines-1], 0,0, backend);
+
+
+
+
+ //triangulate the center
+ triangulateRectCenter(n_ulines, u_val, n_vlines, v_val, backend);
+
+ free(u_val);
+ free(v_val);
+
+}
+
+
+
+
+/**********for reading newtess_flag from a file**********/
+static Int read_flag(char* name)
+{
+ Int ret;
+ FILE* fp = fopen(name, "r");
+ if(fp == NULL)
+ {
+ fprintf(stderr, "can't open file %s\n", name);
+ exit(1);
+ }
+ fscanf(fp, "%i", &ret);
+ fclose(fp);
+ return ret;
+}
+
+
+/***********nextgen tess****************/
+#include "sampleMonoPoly.h"
+directedLine* arcToDLine(Arc_ptr arc)
+{
+ int i;
+ Real vert[2];
+ directedLine* ret;
+ sampledLine* sline = new sampledLine(arc->pwlArc->npts);
+ for(i=0; i<arc->pwlArc->npts; i++)
+ {
+ vert[0] = arc->pwlArc->pts[i].param[0];
+ vert[1] = arc->pwlArc->pts[i].param[1];
+ sline->setPoint(i, vert);
+ }
+ ret = new directedLine(INCREASING, sline);
+ return ret;
+}
+
+/*an pwlArc may not be a straight line*/
+directedLine* arcToMultDLines(directedLine* original, Arc_ptr arc)
+{
+ directedLine* ret = original;
+ int is_linear = 0;
+ if(arc->pwlArc->npts == 2 )
+ is_linear = 1;
+ else if(area(arc->pwlArc->pts[0].param, arc->pwlArc->pts[1].param, arc->pwlArc->pts[arc->pwlArc->npts-1].param) == 0.0)
+ is_linear = 1;
+
+ if(is_linear)
+ {
+ directedLine *dline = arcToDLine(arc);
+ if(ret == NULL)
+ ret = dline;
+ else
+ ret->insert(dline);
+ return ret;
+ }
+ else /*not linear*/
+ {
+ for(Int i=0; i<arc->pwlArc->npts-1; i++)
+ {
+ Real vert[2][2];
+ vert[0][0] = arc->pwlArc->pts[i].param[0];
+ vert[0][1] = arc->pwlArc->pts[i].param[1];
+ vert[1][0] = arc->pwlArc->pts[i+1].param[0];
+ vert[1][1] = arc->pwlArc->pts[i+1].param[1];
+
+ sampledLine *sline = new sampledLine(2, vert);
+ directedLine *dline = new directedLine(INCREASING, sline);
+ if(ret == NULL)
+ ret = dline;
+ else
+ ret->insert(dline);
+ }
+ return ret;
+ }
+}
+
+
+
+directedLine* arcLoopToDLineLoop(Arc_ptr loop)
+{
+ directedLine* ret;
+
+ if(loop == NULL)
+ return NULL;
+ ret = arcToMultDLines(NULL, loop);
+//ret->printSingle();
+ for(Arc_ptr temp = loop->next; temp != loop; temp = temp->next){
+ ret = arcToMultDLines(ret, temp);
+//ret->printSingle();
+ }
+
+ return ret;
+}
+
+/*
+void Slicer::evalRBArray(rectBlockArray* rbArray, gridWrap* grid)
+{
+ TrimVertex *trimVert = (TrimVertex*)malloc(sizeof(TrimVertex));
+ trimVert -> nuid = 0;//????
+
+ Real* u_values = grid->get_u_values();
+ Real* v_values = grid->get_v_values();
+
+ Int i,j,k,l;
+
+ for(l=0; l<rbArray->get_n_elements(); l++)
+ {
+ rectBlock* block = rbArray->get_element(l);
+ for(k=0, i=block->get_upGridLineIndex(); i>block->get_lowGridLineIndex(); i--, k++)
+ {
+
+ backend.bgnqstrip();
+ for(j=block->get_leftIndices()[k+1]; j<= block->get_rightIndices()[k+1]; j++)
+ {
+ trimVert->param[0] = u_values[j];
+ trimVert->param[1] = v_values[i];
+ backend.tmeshvert(trimVert);
+
+ trimVert->param[1] = v_values[i-1];
+ backend.tmeshvert(trimVert);
+
+ }
+ backend.endqstrip();
+
+ }
+ }
+
+ free(trimVert);
+}
+*/
+
+void Slicer::evalRBArray(rectBlockArray* rbArray, gridWrap* grid)
+{
+ Int i,j,k;
+
+ Int n_vlines=grid->get_n_vlines();
+ //the reason to switch the position of v_max and v_min is because of the
+ //the orientation problem. glEvalMesh generates quad_strip clockwise, but
+ //we need counter-clockwise.
+ backend.surfgrid(grid->get_u_min(), grid->get_u_max(), grid->get_n_ulines()-1,
+ grid->get_v_max(), grid->get_v_min(), n_vlines-1);
+
+
+ for(j=0; j<rbArray->get_n_elements(); j++)
+ {
+ rectBlock* block = rbArray->get_element(j);
+ Int low = block->get_lowGridLineIndex();
+ Int high = block->get_upGridLineIndex();
+
+ for(k=0, i=high; i>low; i--, k++)
+ {
+ backend.surfmesh(block->get_leftIndices()[k+1], n_vlines-1-i, block->get_rightIndices()[k+1]-block->get_leftIndices()[k+1], 1);
+ }
+ }
+}
+
+
+void Slicer::evalStream(primStream* pStream)
+{
+ Int i,j,k;
+ k=0;
+/* TrimVertex X;*/
+ TrimVertex *trimVert =/*&X*/ (TrimVertex*)malloc(sizeof(TrimVertex));
+ trimVert -> nuid = 0;//???
+ Real* vertices = pStream->get_vertices(); //for efficiency
+ for(i=0; i<pStream->get_n_prims(); i++)
+ {
+
+ //ith primitive has #vertices = lengths[i], type=types[i]
+ switch(pStream->get_type(i)){
+ case PRIMITIVE_STREAM_FAN:
+
+ backend.bgntfan();
+
+ for(j=0; j<pStream->get_length(i); j++)
+ {
+ trimVert->param[0] = vertices[k];
+ trimVert->param[1] = vertices[k+1];
+ backend.tmeshvert(trimVert);
+
+// backend.tmeshvert(vertices[k], vertices[k+1]);
+ k += 2;
+ }
+ backend.endtfan();
+ break;
+
+ default:
+ fprintf(stderr, "evalStream: not implemented yet\n");
+ exit(1);
+
+ }
+ }
+ free(trimVert);
+}
+
+
+
+
+void Slicer::slice_new(Arc_ptr loop)
+{
+//count++;
+//if(count == 78) count=1;
+//printf("count=%i\n", count);
+//if( ! (4<= count && count <=4)) return;
+
+
+ Int num_ulines;
+ Int num_vlines;
+ Real uMin, uMax, vMin, vMax;
+ Real mydu, mydv;
+ uMin = uMax = loop->tail()[0];
+ vMin = vMax = loop->tail()[1];
+ mydu = (du>0)? du: -du;
+ mydv = (dv>0)? dv: -dv;
+
+ for(Arc_ptr jarc=loop->next; jarc != loop; jarc = jarc->next)
+ {
+
+ if(jarc->tail()[0] < uMin)
+ uMin = jarc->tail()[0];
+ if(jarc->tail()[0] > uMax)
+ uMax = jarc->tail()[0];
+ if(jarc->tail()[1] < vMin)
+ vMin = jarc->tail()[1];
+ if(jarc->tail()[1] > vMax)
+ vMax = jarc->tail()[1];
+ }
+
+ if(mydu > uMax - uMin)
+ num_ulines = 2;
+ else
+ {
+ num_ulines = 3 + (Int) ((uMax-uMin)/mydu);
+ }
+ if(mydv>=vMax-vMin)
+ num_vlines = 2;
+ else
+ {
+ num_vlines = 2+(Int)((vMax-vMin)/mydv);
+ }
+
+ Int isRect = is_rect(loop);
+
+ if(isRect && (num_ulines<=2 || num_vlines<=2))
+ {
+ if(vlinear)
+ triangulateRect(loop, backend, 1, ulinear, vlinear);
+ else if(ulinear)
+ triangulateRect(loop, backend, -1, ulinear, vlinear);
+ else
+ triangulateRect(loop, backend, 0, ulinear, vlinear);
+ }
+
+ else if(isRect)
+ {
+ triangulateRectGen(loop, num_ulines-2, num_vlines-2, backend);
+ }
+ else if( (num_ulines<=2 || num_vlines <=2) && ulinear)
+ {
+ monoTriangulationFunBackend(loop, compV2InY, &backend);
+ }
+ else if( (!ulinear) && (!vlinear) && (num_ulines == 2) && (num_vlines > 2))
+ {
+ monoTriangulationFunBackend(loop, compV2InY, &backend);
+ }
+ else
+ {
+ directedLine* poly = arcLoopToDLineLoop(loop);
+
+ gridWrap grid(num_ulines, num_vlines, uMin, uMax, vMin, vMax);
+ primStream pStream(20, 20);
+ rectBlockArray rbArray(20);
+
+ sampleMonoPoly(poly, &grid, ulinear, vlinear, &pStream, &rbArray);
+
+ evalStream(&pStream);
+
+ evalRBArray(&rbArray, &grid);
+
+#ifdef COUNT_TRIANGLES
+ num_triangles += pStream.num_triangles();
+ num_quads += rbArray.num_quads();
+#endif
+ poly->deleteSinglePolygonWithSline();
+ }
+
+#ifdef COUNT_TRIANGLES
+ printf("num_triangles=%i\n", num_triangles);
+ printf("num_quads = %i\n", num_quads);
+#endif
+}
+
+void Slicer::slice(Arc_ptr loop)
+{
+#ifdef USE_READ_FLAG
+ if(read_flag("flagFile"))
+ slice_new(loop);
+ else
+ slice_old(loop);
+
+#else
+ slice_new(loop);
+#endif
+
+}
+
+
+
+Slicer::Slicer( Backend &b )
+ : CoveAndTiler( b ), Mesher( b ), backend( b )
+{
+ ulinear = 0;
+ vlinear = 0;
+}
+
+Slicer::~Slicer()
+{
+}
+
+void
+Slicer::setisolines( int x )
+{
+ isolines = x;
+}
+
+void
+Slicer::setstriptessellation( REAL x, REAL y )
+{
+ assert(x > 0 && y > 0);
+ du = x;
+ dv = y;
+ setDu( du );
+}
+
+void
+Slicer::slice_old( Arc_ptr loop )
+{
+ loop->markverts();
+
+ Arc_ptr extrema[4];
+ loop->getextrema( extrema );
+
+ unsigned int npts = loop->numpts();
+ TrimRegion::init( npts, extrema[0] );
+
+ Mesher::init( npts );
+
+ long ulines = uarray.init( du, extrema[1], extrema[3] );
+//printf("ulines = %i\n", ulines);
+ Varray varray;
+ long vlines = varray.init( dv, extrema[0], extrema[2] );
+//printf("vlines = %i\n", vlines);
+ long botv = 0;
+ long topv;
+ TrimRegion::init( varray.varray[botv] );
+ getGridExtent( &extrema[0]->pwlArc->pts[0], &extrema[0]->pwlArc->pts[0] );
+
+ for( long quad=0; quad<varray.numquads; quad++ ) {
+ backend.surfgrid( uarray.uarray[0],
+ uarray.uarray[ulines-1],
+ ulines-1,
+ varray.vval[quad],
+ varray.vval[quad+1],
+ varray.voffset[quad+1] - varray.voffset[quad] );
+
+ for( long i=varray.voffset[quad]+1; i <= varray.voffset[quad+1]; i++ ) {
+ topv = botv++;
+ advance( topv - varray.voffset[quad],
+ botv - varray.voffset[quad],
+ varray.varray[botv] );
+ if( i == vlines )
+ getPts( extrema[2] );
+ else
+ getPts( backend );
+ getGridExtent();
+ if( isolines ) {
+ outline();
+ } else {
+ if( canTile() )
+ coveAndTile();
+ else
+ mesh();
+ }
+ }
+ }
+}
+
+
+void
+Slicer::outline( void )
+{
+ GridTrimVertex upper, lower;
+ Hull::init( );
+
+ backend.bgnoutline();
+ while( (nextupper( &upper )) ) {
+ if( upper.isGridVert() )
+ backend.linevert( upper.g );
+ else
+ backend.linevert( upper.t );
+ }
+ backend.endoutline();
+
+ backend.bgnoutline();
+ while( (nextlower( &lower )) ) {
+ if( lower.isGridVert() )
+ backend.linevert( lower.g );
+ else
+ backend.linevert( lower.t );
+ }
+ backend.endoutline();
+}
+
+
+void
+Slicer::outline( Arc_ptr jarc )
+{
+ jarc->markverts();
+
+ if( jarc->pwlArc->npts >= 2 ) {
+ backend.bgnoutline();
+ for( int j = jarc->pwlArc->npts-1; j >= 0; j-- )
+ backend.linevert( &(jarc->pwlArc->pts[j]) );
+ backend.endoutline();
+ }
+}
+
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 20:14:16 +0000