+++ /dev/null
-/*
-** 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++
- *
- */
-
-//#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 "simplemath.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) ((glu_abs(a-b) <= ZERO)? 1:0) //only used in tessellating a rectangle
-
-#if 0 // UNUSED
-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;
-}
-#endif
-
-/******triangulate a monotone polygon**************/
-#include "monoTriangulation.h"
-#if 0 // UNUSED
-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;
-}
-#endif
-
-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(fglu_abs(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( (glu_abs(loop->tail()[0] - loop->head()[0])<=ZERO) &&
- (glu_abs(loop->next->tail()[1] - loop->next->head()[1])<=ZERO) &&
- (glu_abs(loop->prev->tail()[1] - loop->prev->head()[1])<=ZERO) &&
- (glu_abs(loop->prev->prev->tail()[0] - loop->prev->prev->head()[0])<=ZERO)
- )
- return 1;
- else if
- ( (glu_abs(loop->tail()[1] - loop->head()[1]) <= ZERO) &&
- (glu_abs(loop->next->tail()[0] - loop->next->head()[0]) <= ZERO) &&
- (glu_abs(loop->prev->tail()[0] - loop->prev->head()[0]) <= ZERO) &&
- (glu_abs(loop->prev->prev->tail()[1] - loop->prev->prev->head()[1]) <= ZERO)
- )
- return 1;
- else
- return 0;
-}
-
-
-//a line with the same u for opt
-#ifdef USE_OPTTT
-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]);
-}
-#endif
-
-//a line with the same v for opt
-#ifdef USE_OPTTT
-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]);
-}
-#endif
-
-#ifdef USE_OPTTT
-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]);
- }
-}
-#endif
-
-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)
-{
- //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)
-{
-
- // XXX this code was patched by Diego Santa Cruz <Diego.SantaCruz@epfl.ch>
- // to fix a problem in which glMapGrid2f() was called with bad parameters.
- // This has beens submitted to SGI but not integrated as of May 1, 2001.
- if(n_ulines>1 && n_vlines>1) {
- backend.surfgrid(u_val[0], u_val[n_ulines-1], n_ulines-1,
- v_val[n_vlines-1], v_val[0], 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**********/
-#ifdef USE_READ_FLAG
-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;
-}
-#endif
-
-/***********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 (uMax == uMin)
- return; // prevent divide-by-zero. Jon Perry. 17 June 2002
-
- 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 )
-{
- oneOverDu = 0;
- du = 0;
- dv = 0;
- isolines = 0;
- 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();
- }
-}
-
-
projects / reactos.git / blobdiff