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OpenGl_PrimitiveArray.c

/*
  File OpenGl_PrimitiveArray.c

  Created 16/06/2000 :  ATS : G005 : Modified version of OpenGl_indexpolygons.c, which use glDrawArrays or glDrawElements for rendering of primitive
  21.06.03 : SAN : suppress display at all in animation mode if degenartion ratio == 1 (FULL_DEGENER)
  03.07.03 : SAN : draw_degenerates_as_lines() function - all client states disabled except GL_VERTEX_ARRAY
                   in order to avoid exceptions in animation mode (OCC3192)
*/

#define xOGLBUG         /* UNFORTUNATLY the edge flags are attached to vertexes 
                and not to the edges. So the edge visibillity flags array 
                is not usable.
*/

#define xPRINT

#define TEST

#define FULL_DEGENER
#define OCC3192

#ifndef Max
#define Max(a,b) ((a) > (b) ? (a) : (b))
#endif

#ifndef Rand
static unsigned long vRand = 1L;
#define Rand() (vRand = vRand * 214013L + 2531011L)
#endif


#define OCC7833         /* ASL 26/01/05 transparency of polygon with colors assigned to vertices */

/*----------------------------------------------------------------------*/
/*
 * Includes
 */ 

#include <OpenGl_tgl_all.h>

#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <GL/gl.h>
#include <GL/glu.h>

#include <OpenGl_cmn_varargs.h>
#include <OpenGl_cmn_memory.h>
#include <OpenGl_telem_attri.h>
#include <OpenGl_tsm.h>
#include <OpenGl_telem.h>
#include <OpenGl_telem_util.h>
#include <OpenGl_telem_highlight.h>
#include <OpenGl_telem_inquire.h>
#include <OpenGl_telem_view.h>
#include <OpenGl_tgl_funcs.h>
#include <OpenGl_LightBox.h>
#include <OpenGl_TextureBox.h>
#include <InterfaceGraphic_PrimitiveArray.hxx>

# include <float.h>
# define DEF_DS_INTERNAL
# include <OpenGl_degeneration.h>
# ifdef WNT
#  define GET_GL_CONTEXT() wglGetCurrentContext ()
# else
#  define GET_GL_CONTEXT() glXGetCurrentContext ()
# endif  /* WNT */

  extern GLboolean g_fBitmap;

typedef CALL_DEF_PARRAY *call_def_parray;

/*----------------------------------------------------------------------*/
/*
 * Constantes
 */ 

/*----------------------------------------------------------------------*/
/*
 * Prototypes
 */ 

static  TStatus  ParrayDisplay( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  ParrayAdd( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  ParrayDelete( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  ParrayPrint( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  ParrayInquire( TSM_ELEM_DATA, Tint, cmn_key* );

/*static  GLboolean       lighting_mode;*/

static void draw_array(
             call_def_parray,
             Tint,          /* highlight_flag */
             Tint,          /* front_lighting_model,  */
             Tint,          /* interior_style,  */
             Tint,          /* edge_flag,  */
             tel_colour,    /* interior_colour, */
             tel_colour,    /* line_colour, */
             tel_colour     /* edge_colour, */
#ifdef OCC7833
             ,tel_surf_prop
#endif
             );

static void draw_edges                 ( call_def_parray, tel_colour );
static void draw_degenerates_as_points ( call_def_parray, tel_colour );
static void draw_degenerates_as_lines  ( call_def_parray, tel_colour );
static void draw_degenerates_as_bboxs  ( call_def_parray, tel_colour );

static  TStatus  (*MtdTbl[])( TSM_ELEM_DATA, Tint, cmn_key* ) =
{
    NULL,             /* PickTraverse */
    ParrayDisplay,
    ParrayAdd,
    ParrayDelete,
    ParrayPrint,
    ParrayInquire
};
static GLenum draw_mode;
#ifdef IARRAY
static GLenum draw_iformat;
static GLsizei draw_isize;
#endif

/*----------------------------------------------------------------------*/
/*
 * Variables externes
 */
 
extern  Tint  ForbidSetTextureMapping; /* currently defined in tsm/tsm.c */

extern int   g_nDegenerateModel;
extern float g_fSkipRatio;

/*----------------------------------------------------------------------*/

MtblPtr
TelParrayInitClass( TelType* el )
{
    *el = TelParray;
    return MtdTbl;
}

/*----------------------------------------------------------------------*/

static  TStatus
ParrayAdd( TSM_ELEM_DATA d, Tint n, cmn_key *k )
{

    if( k[0]->id != PARRAY_ID ) return TFailure;

    ((tsm_elem_data)(d.pdata))->pdata = k[0]->data.pdata;

    return TSuccess;
}

/*----------------------------------------------------------------------*/

static  TStatus
ParrayDisplay( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
   CMN_KEY       k11, k12, k17, k18, k111, k114, k115;

   Tint           front_lighting_model;
   Tint           interior_style;
   TEL_COLOUR     interior_colour;
   TEL_COLOUR     edge_colour;
   TEL_COLOUR     line_colour;
   Tint           edge_flag;

#ifdef OCC7833
   CMN_KEY        k117;
   TEL_SURF_PROP  prop;
#endif

   CALL_DEF_PARRAY *d = data.pdata;

   k12.id          = TelInteriorReflectanceEquation;
   k17.id          = TelInteriorStyle;
   k18.id          = TelEdgeFlag;
   k111.id         = TelInteriorColour;
   k111.data.pdata = &interior_colour;
   k114.id         = TelEdgeColour;
   k114.data.pdata = &edge_colour;
   k115.id         = TelPolylineColour;
   k115.data.pdata = &line_colour;

#ifdef OCC7833
   k117.id         = TelSurfaceAreaProperties;
   k117.data.pdata = &prop;
#endif

#ifdef OCC7833
   TsmGetAttri( 7, &k12, &k17, &k18, &k111, &k114, &k115, &k117 );
#else
   TsmGetAttri( 6, &k12, &k17, &k18, &k111, &k114, &k115 );
#endif

   front_lighting_model     = k12.data.ldata;
   interior_style           = k17.data.ldata;
   edge_flag                = k18.data.ldata;

#ifdef PRINT
   printf("ParrayDisplay type %d\n",d->type); 
#endif

    /* 
     * Use highlight colours 
     */
     
    if( k[0]->id == TOn ) {                         
      TEL_HIGHLIGHT  hrep;

      k11.id = TelHighlightIndex;
      TsmGetAttri( 1, &k11 );
      if( TelGetHighlightRep( TglActiveWs, k11.data.ldata, &hrep ) == TSuccess ) {
        if( hrep.type == TelHLForcedColour ) {
          edge_colour = interior_colour = line_colour = hrep.col;
          front_lighting_model = CALL_PHIGS_REFL_NONE;
        } else if( hrep.type == TelHLColour ) {
          edge_colour = hrep.col;
          k[0]->id = TOff;
        }
      } else {
        TelGetHighlightRep( TglActiveWs, 0, &hrep );
        if( hrep.type == TelHLForcedColour ) {
          edge_colour = interior_colour = line_colour = hrep.col;
          front_lighting_model = CALL_PHIGS_REFL_NONE;
        } else if( hrep.type == TelHLColour ) {
          edge_colour = hrep.col;
          k[0]->id = TOff;
        }
      }
    }

    draw_array( d, k[0]->id,
                   front_lighting_model,
                   interior_style,
                   edge_flag,     
                   &interior_colour,
                   &line_colour,
                   &edge_colour
#ifdef OCC7833
                   ,&prop
#endif
                   );

    return TSuccess;

}

/*----------------------------------------------------------------------*/

static void 
draw_primitive_array( call_def_parray p, GLenum mode, GLint first, GLsizei count )
{
      int i;
      glBegin( mode );
      for( i=first; i<(first + count); i++ )
      {
            if( p->vnormals )
                  glNormal3fv( p->vnormals[i].xyz );
            if( p->vtexels && !ForbidSetTextureMapping )
                  glTexCoord3fv( p->vtexels[i].xy );
            if( p->vertices ) 
                  glVertex3fv( p->vertices[i].xyz );
        if ( p->vcolours ) 
                  glColor3fv( p->vcolours[i].rgb );  
      }
      glEnd();
}

/*----------------------------------------------------------------------*/

static void 
draw_primitive_elements( call_def_parray p, GLenum mode, GLsizei count, GLenum type, GLenum *indices )
{
      int i;
      GLenum index;
      glBegin( mode );
      for( i=0; i<count; i++ )
      {
            index = indices[i];
            if( p->vnormals )
                  glNormal3fv( p->vnormals[index].xyz );
            if( p->vtexels && !ForbidSetTextureMapping )
                  glTexCoord3fv( p->vtexels[index].xy );
            if( p->vertices ) 
                  glVertex3fv( p->vertices[index].xyz );
        if ( p->vcolours ) 
                  glColor3fv( p->vcolours[index].rgb );
      }
      glEnd();
}

/*----------------------------------------------------------------------*/
static void
draw_array( call_def_parray p, Tint hflag,
             Tint lighting_model,
             Tint interior_style,
             Tint edge_flag,
             tel_colour interior_colour,
             tel_colour line_colour,
             tel_colour edge_colour
#ifdef OCC7833
             ,tel_surf_prop prop
#endif
             )
{
    Tint i,n;

    GLint renderMode;

    /* Following pointers have been provided for performance improvement */
    tel_colour pvc, pfc;

    pvc = p->vcolours;
    pfc = p->fcolours;

#ifdef OCC7833
    if( pvc )
      for( i=0; i<p->num_vertexs; i++ )
        pvc[i].rgb[3] = prop->trans;
#endif


    switch( p->type ) {
      case TelPointsArrayType:
        draw_mode = GL_POINTS; 
        glColor3fv( line_colour->rgb );
        break;
      case TelPolylinesArrayType:
        draw_mode = GL_LINE_STRIP; 
        glColor3fv( line_colour->rgb );
        break;
      case TelSegmentsArrayType:
        draw_mode = GL_LINES;
        glColor3fv( line_colour->rgb );
        break;
      case TelPolygonsArrayType:
        draw_mode = GL_POLYGON;
        glColor3fv( interior_colour->rgb );
        break;
      case TelTrianglesArrayType:
        draw_mode = GL_TRIANGLES;
        glColor3fv( interior_colour->rgb );
        break;
      case TelQuadranglesArrayType:
        draw_mode = GL_QUADS;
        glColor3fv( interior_colour->rgb );
        break;
      case TelTriangleStripsArrayType:
        draw_mode = GL_TRIANGLE_STRIP;
        glColor3fv( interior_colour->rgb );
        break;
      case TelQuadrangleStripsArrayType:
        draw_mode = GL_QUAD_STRIP;
        glColor3fv( interior_colour->rgb );
        break;
      case TelTriangleFansArrayType:
        draw_mode = GL_TRIANGLE_FAN;
        glColor3fv( interior_colour->rgb );
        break;
      default:
        return;
    }

#ifdef IARRAY
    if( p->format == MVERTICE ) {
      draw_iformat = GL_V3F; draw_isize = sizeof(IV3F);
    } else if( p->format == (MVERTICE | MVNORMAL) ) {
      draw_iformat = GL_N3F_V3F; draw_isize = sizeof(IN3FV3F);
    } else if( p->format == (MVERTICE | MVCOLOR) ) {
      draw_iformat = GL_C3F_V3F; draw_isize = sizeof(IC3FV3F);
    } else if( p->format == (MVERTICE | MVTEXEL) ) {
      draw_iformat = GL_T2F_V3F; draw_isize = sizeof(IT2FV3F);
    } else if( p->format == (MVERTICE | MVCOLOR | MVNORMAL) ) {
      draw_iformat = GL_C4F_N3F_V3F; draw_isize = sizeof(IC4FN3FV3F);
    } else if( p->format == (MVERTICE | MVNORMAL | MVTEXEL) ) {
      draw_iformat = GL_T2F_N3F_V3F; draw_isize = sizeof(IT2FN3FV3F);
    } else if( p->format == (MVERTICE | MVCOLOR | MVTEXEL) ) {
      draw_iformat = GL_T2F_C3F_V3F; draw_isize = sizeof(IT2FC3FV3F);
    } else if( p->format == (MVERTICE | MVCOLOR | MVTEXEL | MVNORMAL) ) {
      draw_iformat = GL_T2F_C4F_N3F_V3F; draw_isize = sizeof(IT2FC4FN3FV3F);
    } else {
      printf(" *** Unknown Interleaved array format\n");
      return;
    }
#endif

   /* OCC11904 -- Temporarily disable environment mapping */
   if(draw_mode <= GL_LINE_STRIP){
     glPushAttrib(GL_ENABLE_BIT);
     glDisable(GL_TEXTURE_1D);
     glDisable(GL_TEXTURE_2D);
   }

#ifdef PRINT
printf(" $$$ g_nDegenerateModel %d\n",g_nDegenerateModel);
#endif
    if ( g_nDegenerateModel < 2 && (
        (draw_mode > GL_LINE_STRIP && interior_style != TSM_EMPTY) ||
        (draw_mode <= GL_LINE_STRIP /*&& !hflag*/)
    ) ) {

      if( hflag == TOn ) {
        pvc = pfc = NULL;
      }
       
      if ( interior_style == TSM_HIDDENLINE) {
        edge_flag = 1;
        pvc = pfc = NULL;
      }
      
      /*OCC12297 - Sometimes the GL_LIGHTING mode is activated here 
        without LightOn() call for an unknown reason, so it is necessary 
      to call LightOn() to synchronize LightOn/Off mechanism*/
      LightOn();

      if( lighting_model == CALL_PHIGS_REFL_NONE || draw_mode <= GL_LINE_STRIP )
          LightOff();
     
        glGetIntegerv( GL_RENDER_MODE, &renderMode );

        if( renderMode != GL_FEEDBACK )
        {
#ifdef IARRAY   
            if( p->ivertex.any ) {
                  glInterleavedArrays(draw_iformat,draw_isize,p->ivertex.any);
            } else
#endif 
      {
        if ( p->vnormals ) {
          glEnableClientState(GL_NORMAL_ARRAY);
          glNormalPointer(GL_FLOAT, 0, p->vnormals);            /* array of normals  */
        } else
          glDisableClientState(GL_NORMAL_ARRAY);
                
        if ( p->vtexels && !ForbidSetTextureMapping ) {
          glEnableClientState(GL_TEXTURE_COORD_ARRAY);
          glTexCoordPointer(2, GL_FLOAT, 0, p->vtexels);        /* array of texture coordinates  */
        } else
          glDisableClientState(GL_TEXTURE_COORD_ARRAY);

        if (p->vertices) {
          glEnableClientState(GL_VERTEX_ARRAY);
          glVertexPointer(3, GL_FLOAT, 0, p->vertices); /* array of vertices  */
        } else
          glDisableClientState(GL_VERTEX_ARRAY);

        if ( pvc ) {
          glEnableClientState(GL_COLOR_ARRAY);
#ifdef OCC7833
          glColorPointer(4, GL_FLOAT, 0, pvc);  /* array of colors */
#else
          glColorPointer(3, GL_FLOAT, 0, pvc);  /* array of colors */
#endif

#ifdef TEST
          glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
          glEnable(GL_COLOR_MATERIAL);
#endif
                  } else {
                        glDisableClientState(GL_COLOR_ARRAY);
                  }
            }
        }
        
        if( p->num_bounds > 0 ) {
            if( p->num_edges > 0 ) {
                  for( i=n=0 ; i<p->num_bounds ; i++ ) {
                        if( pfc ) glColor3fv  ( pfc[i].rgb  );
                        if( renderMode == GL_FEEDBACK )
                              draw_primitive_elements( p, draw_mode, p->bounds[i], 
                                 GL_UNSIGNED_INT, (GLenum*) &p->edges[n]);
                        else
                              glDrawElements( draw_mode, p->bounds[i], 
                               GL_UNSIGNED_INT, &p->edges[n]);
                        n += p->bounds[i];
                  }
            } else {
                  for( i=n=0 ; i<p->num_bounds ; i++ ) {
                        if( pfc ) 
                          glColor3fv  ( pfc[i].rgb  );
                        if( renderMode == GL_FEEDBACK )
                              draw_primitive_array( p, draw_mode, n, p->bounds[i]);
                        else
                              glDrawArrays( draw_mode, n, p->bounds[i]);
                        n += p->bounds[i];
                  }
            }
        } else if( p->num_edges > 0 ) {
                  if( renderMode == GL_FEEDBACK )
                        draw_primitive_elements( p, draw_mode, p->num_edges, 
                                  GL_UNSIGNED_INT, (GLenum*) &p->edges[0]);
                  else
                        glDrawElements( draw_mode, p->num_edges, 
                                GL_UNSIGNED_INT, p->edges);
            } else {
                  if( renderMode == GL_FEEDBACK )
                        draw_primitive_array( p, draw_mode, 0, p->num_vertexs);
                  else
                        glDrawArrays( draw_mode, 0, p->num_vertexs);
            }
#ifdef TEST
      if( pvc ) {
        glDisable(GL_COLOR_MATERIAL);
        TelResetMaterial();
      }
#endif

      if ( g_nDegenerateModel ){
        if(draw_mode <= GL_LINE_STRIP)
          glPopAttrib();
        return;
      }
    }

      /* OCC11904 -- Temporarily disable environment mapping */
    /*if(draw_mode <= GL_LINE_STRIP)
    {
      glPushAttrib(GL_ENABLE_BIT);
      glDisable(GL_TEXTURE_GEN_S);
      glDisable(GL_TEXTURE_GEN_T);
    }*/

    if( edge_flag || g_nDegenerateModel ) switch ( g_nDegenerateModel ) {
     default: /* XXX_TDM_NODE or TINY */
      draw_edges ( p, edge_flag ? edge_colour : interior_colour );
      break;
     case 2:  /* XXX_TDM_WIREFRAME */
      draw_degenerates_as_lines ( p, edge_flag ? edge_colour : interior_colour );
      break;
     case 3:  /* XXX_TDM_MARKER */
      draw_degenerates_as_points ( p, edge_flag ? edge_colour : interior_colour );
      break;
     case 4:  /* XXX_TDM_BBOX */
      draw_degenerates_as_bboxs ( p, edge_flag ? edge_colour : interior_colour  );
      break;
    } 
   if(draw_mode <= GL_LINE_STRIP)
     glPopAttrib();
}

/*----------------------------------------------------------------------*/

static  TStatus
ParrayDelete( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
    return TSuccess;
}

/*----------------------------------------------------------------------*/

static  TStatus
ParrayPrint( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
    Tint             i;
    call_def_parray p;

    p = data.pdata;

    fprintf( stdout, "TelParray. Number of Vertices: %d\n", p->num_vertexs );
    if( p->vnormals && p->vcolours && p->vtexels ) 
        fprintf( stdout, "\t\tVertex Flag : NORMAL+COLOR+TEXEL\n" );
    else if( p->vnormals && p->vcolours) 
        fprintf( stdout, "\t\tVertex Flag : NORMAL+COLOR\n" );
    else if( p->vnormals ) 
        fprintf( stdout, "\t\tVertex Flag : NORMAL\n" );
    else
        fprintf( stdout, "\t\tVertex Flag : NONE\n" );
    
    if( p->edge_vis )
    {
        fprintf( stdout, "\t\tEdge Visibility Data :\n" );
        for( i = 0; i < p->num_edges; i++ )
           fprintf( stdout, "\t\t%d ", p->edge_vis[i] );
        fprintf( stdout, "\n" );
    }
    if( p->bounds )
    {
        fprintf( stdout, "\t\tBounds array :\n" );
        for( i = 0; i < p->num_bounds; i++ )
           fprintf( stdout, "\t\tb[%d] %d \n", i, p->bounds[i] );
    }
    if( p->edges )
    {
        fprintf( stdout, "\t\tConnectivity array :\n" );
        for( i = 0; i < p->num_bounds; i++ )
            fprintf( stdout, "\t\tI[%d] %d \n", i, p->edges[i] );
    }
    if( p->fcolours )
    {
         fprintf( stdout, "\n\t\tFacet Colours : " );
         for( i = 0; i < p->num_bounds; i++ )
            fprintf( stdout, "\n\t\t v[%d] = %g %g %g", i,
                                                        p->fcolours[i].rgb[0],
                                                        p->fcolours[i].rgb[1],
                                                        p->fcolours[i].rgb[2] );    }
    else
       fprintf( stdout, "\n\t\tFacet Colours not specified\n" );

    if( p->vertices )
    {
         fprintf( stdout, "\n\t\tVertices : " );
         for( i = 0; i < p->num_vertexs; i++ )
            fprintf( stdout, "\n\t\t v[%d] = %g %g %g", i,
                                                        p->vertices[i].xyz[0],
                                                        p->vertices[i].xyz[1],
                                                        p->vertices[i].xyz[2] );
    }

    fprintf( stdout, "\n" );
    if( p->vcolours )
    {
         fprintf( stdout, "\n\t\tVertex Colours : " );
         for( i = 0; i < p->num_vertexs; i++ )
            fprintf( stdout, "\n\t\t v[%d] = %g %g %g", i,
                                                        p->vcolours[i].rgb[0],
                                                        p->vcolours[i].rgb[1],
                                                        p->vcolours[i].rgb[2] );
    }
    else
       fprintf( stdout, "\n\t\tVertex Colours not specified\n" );

    if( p->vnormals )
    {
         fprintf( stdout, "\n\t\tVertex Normals : " );
         for( i = 0; i < p->num_vertexs; i++ )
            fprintf( stdout, "\n\t\t v[%d] = %g %g %g", i,
                                                        p->vnormals[i].xyz[0],
                                                        p->vnormals[i].xyz[1],
                                                        p->vnormals[i].xyz[2] );
    }
    else
       fprintf( stdout, "\n\t\tVertex Normals not specified\n" );

    if (p->vtexels)
    {
      fprintf(stdout, "\n\t\tTexture Coordinates : ");
      for (i=0; i<p->num_vertexs; i++)
        fprintf(stdout, "\n\t\t v[%d] = %g %g", i,
                p->vtexels[i].xy[0],
                p->vtexels[i].xy[1]);
    }
    else
      fprintf( stdout, "\n\t\tTexture Coordinates not specified\n");

    fprintf( stdout, "\n" );

    return TSuccess;
}

/*----------------------------------------------------------------------*/

static TStatus
ParrayInquire( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
   Tint                 i, j;
   call_def_parray   d;
   Tint                 size_reqd=0;
   Tint                 status = TSuccess;
   Tchar                *cur_ptr = 0;

   d = data.pdata;

   if( d->edge_vis )
       size_reqd += ( d->num_edges * sizeof( Tint ) );

   size_reqd += ( d->num_bounds * sizeof( Tint ) ); /* bounds */
   size_reqd += ( d->num_edges * sizeof( Tint ) ); /* connectivity */

   if( d->fcolours )
       size_reqd += ( d->num_bounds * sizeof( TEL_COLOUR ) );

   size_reqd += ( d->num_vertexs * sizeof( TEL_POINT ) );

   if( d->vcolours )
      size_reqd += ( d->num_vertexs * sizeof( TEL_COLOUR ) );

   if( d->vnormals )
      size_reqd += ( d->num_vertexs * sizeof( TEL_POINT ) );

   for( i = 0; i < n; i++ )
   {
      switch( k[i]->id )
      {
         case INQ_GET_SIZE_ID:
         {
            k[i]->data.ldata = size_reqd;
            break;
         }

         case INQ_GET_CONTENT_ID:
         {
            TEL_INQ_CONTENT *c;
            Teldata         *w;

            c = k[i]->data.pdata;
            c->act_size = size_reqd;
            w = c->data;

            cur_ptr = c->buf;
            w->indexedpolygons3data.shpflag = TEL_SHAPE_UNKNOWN;
            w->indexedpolygons3data.num_bounds = d->num_bounds;
            w->indexedpolygons3data.num_vertices = d->num_vertexs;
            if( d->edge_vis )
                w->indexedpolygons3data.edgflag = TOn;
            else
                w->indexedpolygons3data.edgflag = TOff;

            if( c->size >= size_reqd ) {
                w->indexedpolygons3data.gnormals = 0;
                if( d->fcolours ) {
                      w->indexedpolygons3data.fctflag = TEL_FAFLAG_COLOUR;
                      w->indexedpolygons3data.facet_colour_vals =
                                                          (tel_colour)(c->buf );
                      for( j = 0; j < d->num_bounds; j++ ) {
                         w->indexedpolygons3data.facet_colour_vals[j] =
                                                          d->fcolours[j];
                      }
                      cur_ptr += ( d->num_bounds * sizeof( TEL_COLOUR ) );
                } else {
                      w->indexedpolygons3data.fctflag = TEL_FAFLAG_NONE;
                      w->indexedpolygons3data.facet_colour_vals = 0;
                }

                if( d->edge_vis ) {
                  w->indexedpolygons3data.edgvis = (Tint *)(cur_ptr);
                  for( j = 0; j < d->num_edges; j++ ) {
                    w->indexedpolygons3data.edgvis[j] = (Tint) d->edge_vis[j];
                  }
                  cur_ptr += (d->num_edges * sizeof( Tint ) );
                }

                w->indexedpolygons3data.points = (tel_point)cur_ptr;
                for( j = 0; j < d->num_vertexs; j++ ) {
                   w->indexedpolygons3data.points[j] = d->vertices[j];
                }
                cur_ptr += ( d->num_vertexs * sizeof( TEL_POINT ) );

                w->indexedpolygons3data.bounds = (Tint *)cur_ptr;

                                /* !!! WARNING: New bounds have only 1 element */
                /*cmn_memcpy( w->indexedpolygons3data.bounds, d->bounds,
                                        d->num_bounds * sizeof( Tint ) ); */
                cmn_memcpy( w->indexedpolygons3data.bounds, d->bounds,
                                        1 * sizeof( Tint ) );

                cur_ptr += ( d->num_bounds * sizeof( Tint ) );

                w->indexedpolygons3data.indices = (Tint *)cur_ptr;
                cmn_memcpy( w->indexedpolygons3data.indices, d->edges,
                                        d->num_bounds * sizeof( Tint ) );
                cur_ptr += ( d->num_bounds * sizeof( Tint ) );

                if( d->vnormals ) {
                   if( d->vcolours ) {
                      w->indexedpolygons3data.vrtflag = TEL_VTFLAG_COLOURNORMAL;
                      w->indexedpolygons3data.vnormals = (tel_point)(cur_ptr);
                      for( j = 0; j < d->num_vertexs; j++ ) {
                         w->indexedpolygons3data.vnormals[j] = d->vnormals[i];
                      }
                      cur_ptr += ( d->num_vertexs * sizeof( TEL_POINT ) );

                      w->indexedpolygons3data.colours = (tel_colour)(cur_ptr);

                      for( j = 0; j < d->num_vertexs; j++ ) {
                         w->indexedpolygons3data.colours[j] = d->vcolours[i];
                      }
                   } else {
                      w->indexedpolygons3data.vrtflag = TEL_VTFLAG_NORMAL;
                      w->indexedpolygons3data.colours = 0;
                      w->indexedpolygons3data.vnormals = (tel_point)(cur_ptr);

                      for( j = 0; j < d->num_vertexs; j++ ) {
                         w->indexedpolygons3data.vnormals[j] = d->vnormals[i];
                      }
                   }
                } else {
                   w->indexedpolygons3data.vnormals = 0;
                   if( d->vcolours ) {
                      w->indexedpolygons3data.vrtflag = TEL_VTFLAG_COLOUR;
                      w->indexedpolygons3data.colours = (tel_colour)(cur_ptr);
                      for( j = 0; j < d->num_vertexs; j++ ) {
                         w->indexedpolygons3data.colours[j] = d->vcolours[i];
                      }
                   } else {
                      w->indexedpolygons3data.vrtflag = TEL_VTFLAG_NONE;
                      w->indexedpolygons3data.colours = 0;
                   }
                }

                status = TSuccess;
            } else
                status = TFailure;
            break;
         }
      }
   }
   return status;
}

/*----------------------------------------------------------------------*/

static void
draw_edges ( call_def_parray p, tel_colour edge_colour )
{
    Tint    i, j, n;
    Tint    edge_type=0, line_type_preserve=0;
    Tfloat  edge_width=0, line_width_preserve=0;
    /*GLboolean texture_on;*/

      GLint renderMode;
    
    LightOff();
   
    if( draw_mode > GL_LINE_STRIP ) { 
      CMN_KEY k, k1, k2, k3, k4;

      k1.id  = TelPolylineWidth;
      k2.id  = TelPolylineType;
      k3.id  = TelEdgeType;
      k4.id  = TelEdgeWidth;
    
      TsmGetAttri( 4, &k1, &k2, &k3, &k4 );
    
      line_width_preserve = k1.data.fdata;
      line_type_preserve  = k2.data.ldata;
      edge_type           = k3.data.ldata;
      edge_width          = k4.data.fdata;

      if( line_width_preserve != edge_width ) {
        k.id = TelPolylineWidth;
        k.data.fdata = edge_width;
        TsmSetAttri( 1, &k );
      }
      if( line_type_preserve != edge_type ) {
        k.id = TelPolylineType;
        k.data.ldata = edge_type;
        TsmSetAttri( 1, &k );
      }

      glPushAttrib( GL_POLYGON_BIT );
      glPolygonMode( GL_FRONT_AND_BACK, GL_LINE ); 
    }

    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(3, GL_FLOAT, 0, p->vertices); /* array of vertices  */

#ifdef OGLBUG
    if( p->edge_vis ) {
      glEnableClientState(GL_EDGE_FLAG_ARRAY);
      glEdgeFlagPointer( sizeof(Tchar), p->edge_vis);
    } else
      glDisableClientState(GL_EDGE_FLAG_ARRAY);
#endif

      glGetIntegerv( GL_RENDER_MODE, &renderMode );

    glColor3fv( edge_colour->rgb );
    if( p->num_bounds > 0 ) {
      if( p->num_edges > 0 ) {
        for( i=n=0 ; i<p->num_bounds ; i++ ) {
#ifndef OGLBUG
          if( p->edge_vis ) {
            glBegin( draw_mode );
            for( j=0 ; j<p->bounds[i] ; j++ ) {
              glEdgeFlag( p->edge_vis[n+j] );
              glVertex3fv( &p->vertices[p->edges[n+j]].xyz[0] );
            }
            glEnd();
          } else
#endif
              if( renderMode == GL_FEEDBACK )
                        draw_primitive_elements( p, draw_mode, p->bounds[i], 
                                 GL_UNSIGNED_INT, (GLenum*) &p->edges[n]);
              else
                        glDrawElements( draw_mode, p->bounds[i], 
                                GL_UNSIGNED_INT, &p->edges[n]);
          n += p->bounds[i];
        }
      } else {
        for( i=n=0 ; i<p->num_bounds ; i++ ) {
              if( renderMode == GL_FEEDBACK )
                        draw_primitive_array( p, draw_mode, n, p->bounds[i]);
              else
                        glDrawArrays( draw_mode, n, p->bounds[i]);
          n += p->bounds[i];
        }
      }
    } else if( p->num_edges > 0 ) {
#ifndef OGLBUG
      if( p->edge_vis ) {
        glBegin( draw_mode );
        for( i=0 ; i<p->num_edges ; i++ ) {
          glEdgeFlag( p->edge_vis[i] );
          glVertex3fv( &p->vertices[p->edges[i]].xyz[0] );
        }
        glEnd();
      } else
#endif
        if( renderMode == GL_FEEDBACK )
                  draw_primitive_elements( p, draw_mode, p->num_edges, 
                                GL_UNSIGNED_INT, (GLenum*) p->edges);
        else
                  glDrawElements( draw_mode, p->num_edges, 
                                GL_UNSIGNED_INT, p->edges);
    } else {
        if( renderMode == GL_FEEDBACK )
                  draw_primitive_array( p, draw_mode, 0, p->num_vertexs);
        else
                  glDrawArrays( draw_mode, 0, p->num_vertexs);
    }

    if( draw_mode > GL_LINE_STRIP ) { 
      CMN_KEY k;
      if( line_width_preserve != edge_width ) {
        k.id = TelPolylineWidth;
        k.data.fdata = line_width_preserve;
        TsmSetAttri( 1, &k );
      }
      if( line_type_preserve != edge_type ) {
        k.id = TelPolylineType;
        k.data.ldata = line_type_preserve;
        TsmSetAttri( 1, &k );
      }
      glPopAttrib();
    }
}

/*----------------------------------------------------------------------*/
static void draw_degenerates_points_as_points ( call_def_parray p ) { 

    Tint       j;
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    for ( j=0 ; j<p->num_vertexs ; j++ ) {
      glVertex3fv ( &pv[j].xyz[0] );
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_lines_as_points ( call_def_parray p ) { 

    Tint       j;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    for ( j=0 ; j<p->num_vertexs ; j+=2 ) {
      pt[0] = pt[1] = pt[2] = 0.;
      pt[ 0 ] += pv[j].xyz[ 0 ];
      pt[ 1 ] += pv[j].xyz[ 1 ];
      pt[ 2 ] += pv[j].xyz[ 2 ];
      pt[ 0 ] += pv[j+1].xyz[ 0 ];
      pt[ 1 ] += pv[j+1].xyz[ 1 ];
      pt[ 2 ] += pv[j+1].xyz[ 2 ];
      pt[ 0 ] /= 2;
      pt[ 1 ] /= 2;
      pt[ 2 ] /= 2;
      glVertex3fv ( pt );
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_triangles_as_points ( call_def_parray p ) { 

    Tint       i, j, iv;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    if( p->num_edges > 0 ) {
      for ( j=0 ; j<p->num_edges ; j+=3 ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<3 ; i++ ) {
          iv = p->edges[j+i];
          pt[ 0 ] += pv[iv].xyz[ 0 ];
          pt[ 1 ] += pv[iv].xyz[ 1 ];
          pt[ 2 ] += pv[iv].xyz[ 2 ];
        }
        pt[ 0 ] /= 3;
        pt[ 1 ] /= 3;
        pt[ 2 ] /= 3;
        glVertex3fv ( pt );
      }
    } else {
      for ( j=0 ; j<p->num_vertexs ; j+=3 ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<3 ; i++ ) {
          pt[ 0 ] += pv[j+i].xyz[ 0 ];
          pt[ 1 ] += pv[j+i].xyz[ 1 ];
          pt[ 2 ] += pv[j+i].xyz[ 2 ];
        }
        pt[ 0 ] /= 3;
        pt[ 1 ] /= 3;
        pt[ 2 ] /= 3;
        glVertex3fv ( pt );
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_trianglestrips_as_points ( call_def_parray p ) { 

    Tint       i, j, k, n;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    if( p->num_bounds > 0 ) {
      for ( k=n=0 ; k<p->num_bounds ; k++ ) {
        for ( j=0 ; j<p->bounds[k]-2 ; j++ ) {
          pt[0] = pt[1] = pt[2] = 0.;
          for ( i=0 ; i<3 ; i++ ) {
            pt[ 0 ] += pv[n+j+i].xyz[ 0 ];
            pt[ 1 ] += pv[n+j+i].xyz[ 1 ];
            pt[ 2 ] += pv[n+j+i].xyz[ 2 ];
          }
          pt[ 0 ] /= 3;
          pt[ 1 ] /= 3;
          pt[ 2 ] /= 3;
          glVertex3fv ( pt );
        }
        n += p->bounds[k];
      }
    } else {
      for ( j=0 ; j<p->num_vertexs-2 ; j++ ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<3 ; i++ ) {
          pt[ 0 ] += pv[j+i].xyz[ 0 ];
          pt[ 1 ] += pv[j+i].xyz[ 1 ];
          pt[ 2 ] += pv[j+i].xyz[ 2 ];
        }
        pt[ 0 ] /= 3;
        pt[ 1 ] /= 3;
        pt[ 2 ] /= 3;
        glVertex3fv ( pt );
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_polygons_as_points ( call_def_parray p ) { 

    Tint       j, k, n, iv;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    if( p->num_bounds > 0 ) {
      if( p->num_edges > 0 ) {
        for ( k=n=0 ; k<p->num_bounds ; k++ ) {
          pt[0] = pt[1] = pt[2] = 0.;
          for ( j=0 ; j<p->bounds[k] ; j++ ) {
            iv = p->edges[n+j];
            pt[ 0 ] += pv[iv].xyz[ 0 ];
            pt[ 1 ] += pv[iv].xyz[ 1 ];
            pt[ 2 ] += pv[iv].xyz[ 2 ];
          }
          pt[ 0 ] /= p->bounds[k];
          pt[ 1 ] /= p->bounds[k];
          pt[ 2 ] /= p->bounds[k];
          glVertex3fv ( pt );
          n += p->bounds[k];
        }
      } else {  
        for ( k=n=0 ; k<p->num_bounds ; k++ ) {
          pt[0] = pt[1] = pt[2] = 0.;
          for ( j=0 ; j<p->bounds[k] ; j++ ) {
            pt[ 0 ] += pv[n+j].xyz[ 0 ];
            pt[ 1 ] += pv[n+j].xyz[ 1 ];
            pt[ 2 ] += pv[n+j].xyz[ 2 ];
          }
          pt[ 0 ] /= p->bounds[k];
          pt[ 1 ] /= p->bounds[k];
          pt[ 2 ] /= p->bounds[k];
          glVertex3fv ( pt );
          n += p->bounds[k];
        }
      }
    } else if( p->num_edges > 0 ) {
      pt[0] = pt[1] = pt[2] = 0.;
      for ( j=0 ; j<p->num_edges ; j++ ) {
        iv = p->edges[j];
        pt[ 0 ] += pv[iv].xyz[ 0 ];
        pt[ 1 ] += pv[iv].xyz[ 1 ];
        pt[ 2 ] += pv[iv].xyz[ 2 ];
      }
      pt[ 0 ] /= p->num_edges;
      pt[ 1 ] /= p->num_edges;
      pt[ 2 ] /= p->num_edges;
      glVertex3fv ( pt );
    } else {
      pt[0] = pt[1] = pt[2] = 0.;
      for ( j=0 ; j<p->num_vertexs ; j++ ) {
        pt[ 0 ] += pv[j].xyz[ 0 ];
        pt[ 1 ] += pv[j].xyz[ 1 ];
        pt[ 2 ] += pv[j].xyz[ 2 ];
      }
      pt[ 0 ] /= p->num_vertexs;
      pt[ 1 ] /= p->num_vertexs;
      pt[ 2 ] /= p->num_vertexs;
      glVertex3fv ( pt );
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_quadrangles_as_points ( call_def_parray p ) { 

    Tint       i, j, iv;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    if( p->num_edges > 0 ) {
      for ( j=0 ; j<p->num_edges ; j+=4 ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<4 ; i++ ) {
          iv = p->edges[j+i];
          pt[ 0 ] += pv[iv].xyz[ 0 ];
          pt[ 1 ] += pv[iv].xyz[ 1 ];
          pt[ 2 ] += pv[iv].xyz[ 2 ];
        }
        pt[ 0 ] /= 4;
        pt[ 1 ] /= 4;
        pt[ 2 ] /= 4;
        glVertex3fv ( pt );
      }
    } else {
      for ( j=0 ; j<p->num_vertexs ; j+=4 ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<4 ; i++ ) {
          pt[ 0 ] += pv[j+i].xyz[ 0 ];
          pt[ 1 ] += pv[j+i].xyz[ 1 ];
          pt[ 2 ] += pv[j+i].xyz[ 2 ];
        }
        pt[ 0 ] /= 4;
        pt[ 1 ] /= 4;
        pt[ 2 ] /= 4;
        glVertex3fv ( pt );
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_quadranglestrips_as_points ( call_def_parray p ) { 

    Tint       i, j, k, n;
    GLfloat    pt[ 3 ];
    tel_point  pv = p -> vertices;

#ifdef FULL_DEGENER
    if ( g_fSkipRatio == 1. )
      return;
#endif

    if( p->num_bounds > 0 ) {
      for ( k=n=0 ; k<p->num_bounds ; k++ ) {
        for ( j=0 ; j<p->bounds[k]-2 ; j+=2 ) {
          pt[0] = pt[1] = pt[2] = 0.;
          for ( i=0 ; i<4 ; i++ ) {
            pt[ 0 ] += pv[n+j+i].xyz[ 0 ];
            pt[ 1 ] += pv[n+j+i].xyz[ 1 ];
            pt[ 2 ] += pv[n+j+i].xyz[ 2 ];
          }
          pt[ 0 ] /= 4;
          pt[ 1 ] /= 4;
          pt[ 2 ] /= 4;
          glVertex3fv ( pt );
        }
        n += p->bounds[k];
      }
    } else {
      for ( j=0 ; j<p->num_vertexs-2 ; j+=2 ) {
        pt[0] = pt[1] = pt[2] = 0.;
        for ( i=0 ; i<4 ; i++ ) {
          pt[ 0 ] += pv[j+i].xyz[ 0 ];
          pt[ 1 ] += pv[j+i].xyz[ 1 ];
          pt[ 2 ] += pv[j+i].xyz[ 2 ];
        }
        pt[ 0 ] /= 4;
        pt[ 1 ] /= 4;
        pt[ 2 ] /= 4;
        glVertex3fv ( pt );
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_as_points ( call_def_parray p, 
                tel_colour edge_colour ) {

    GLboolean zbuff_state = glIsEnabled(GL_DEPTH_TEST);

    LightOff ();

    if( zbuff_state ) glDisable(GL_DEPTH_TEST); 

    glColor3fv( edge_colour->rgb );

    glBegin ( GL_POINTS );

    switch( draw_mode ) {
      case GL_POINTS:
        draw_degenerates_points_as_points( p );
        break;
      case GL_LINES:
        draw_degenerates_lines_as_points( p );
        break;
      case GL_LINE_STRIP:
      case GL_POLYGON:
        draw_degenerates_polygons_as_points( p );
        break;
      case GL_TRIANGLES:
        draw_degenerates_triangles_as_points( p );
        break;
      case GL_QUADS:
        draw_degenerates_quadrangles_as_points( p );
        break;
      case GL_TRIANGLE_FAN:
      case GL_TRIANGLE_STRIP:
        draw_degenerates_trianglestrips_as_points( p );
        break;
      case GL_QUAD_STRIP:
        draw_degenerates_quadranglestrips_as_points( p );
        break;
      default:
        break;
    }

    glEnd ();

    if( zbuff_state ) glEnable(GL_DEPTH_TEST); 
}

/*----------------------------------------------------------------------*/
static void draw_degenerates_lines_as_lines ( call_def_parray p ) { 

    Tint       i,j,n,iv;
    tel_point  pv = p -> vertices;

    n = p->num_vertexs;
    j = (int)((1.-g_fSkipRatio)*n);
    while ( j-- ) {
      i = Rand() % n;
      p->keys[i] = -p->keys[i];
    };

    if( p->num_bounds > 0 ) {
      if( p->num_edges > 0 ) {
        for ( i=n=0 ; i<p->num_bounds ; i++ ) {
          glBegin ( GL_LINES );
          for ( j=0 ; j<p->bounds[i] ; j++ ) {
            iv = p->edges[n+j];
            if( p->keys[iv] < 0 ) {
              p->keys[iv] = -p->keys[iv];
              glVertex3fv ( pv[iv].xyz );
            }
          }
          glEnd();
          n += p->bounds[i];
        }
      } else {  
        for ( i=n=0 ; i<p->num_bounds ; i++ ) {
          glBegin ( GL_LINES );
          for ( j=0 ; j<p->bounds[i] ; j++ ) {
            if( p->keys[n+j] < 0 ) {
              p->keys[n+j] = -p->keys[n+j];
              glVertex3fv ( pv[n+j].xyz );
            }
          }
          glEnd();
          n += p->bounds[i];
        }
      }
    } else if( p->num_edges > 0 ) {
      glBegin ( GL_LINES );
      for ( j=0 ; j<p->num_edges ; j++ ) {
        iv = p->edges[j];
        if( p->keys[iv] < 0 ) {
          p->keys[iv] = -p->keys[iv];
          glVertex3fv ( pv[iv].xyz );
        }
      }
      glEnd();
    } else {
      glBegin ( GL_LINES );
      for ( j=0 ; j<p->num_vertexs ; j++ ) {
        if( p->keys[j] < 0 ) {
          p->keys[j] = -p->keys[j];
          glVertex3fv ( pv[j].xyz );
        }
      }
      glEnd();
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_triangles_as_lines ( call_def_parray p ) { 

    Tint       i,j,n,iv;
    tel_point  pv = p -> vertices;

    n = p->num_vertexs/3;
    j = (int)((1.-g_fSkipRatio)*n);
    while ( j-- ) {
      i = Rand() % n; i *= 3;
      p->keys[i] = -p->keys[i];
    };

    if( p->num_edges > 0 ) {
      for ( j=0 ; j<p->num_edges ; j+=3 ) {
        iv = p->edges[j];
        if( p->keys[iv] < 0 ) { 
          p->keys[iv] = -p->keys[iv];
          glBegin ( GL_LINE_LOOP );
          for ( i=0 ; i<3 ; i++ ) {
            iv = p->edges[j+i];
            glVertex3fv ( pv[iv].xyz );
          }
          glEnd();
        }
      }
    } else {
      for ( j=0 ; j<p->num_vertexs ; j+=3 ) {
        if( p->keys[j] < 0 ) { 
          p->keys[j] = -p->keys[j];
          glBegin ( GL_LINE_LOOP );
          for ( i=0 ; i<3 ; i++ ) {
            glVertex3fv ( pv[j+i].xyz );
          }
          glEnd();
        }
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_trianglestrips_as_lines ( call_def_parray p ) { 

    Tint       i,j,k,n,ni;
    tel_point  pv = p -> vertices;

    if( p->num_bounds > 0 ) {
      for ( i=n=0 ; i<p->num_bounds ; i++ ) {
        ni = p->bounds[i]-2;
        k = (int)((1.-g_fSkipRatio)*ni);
        while ( k-- ) {
          j = Rand() % ni; j += 2;
          p->keys[n+j] = -p->keys[n+j];
        };
        for ( j=2 ; j<p->bounds[i] ; j++ ) {
          if( p->keys[n+j] < 0 ) { 
            p->keys[n+j] = -p->keys[n+j];
            glBegin ( GL_LINE_LOOP );
            glVertex3fv ( pv[n+j-2].xyz );
            glVertex3fv ( pv[n+j-1].xyz );
            glVertex3fv ( pv[n+j].xyz );
            glEnd();
          }
        }
        n += p->bounds[i];
      }
    } else {
      ni = p->num_vertexs-2;
      k = (int)((1.-g_fSkipRatio)*ni);
      while ( k-- ) {
        j = Rand() % ni; j += 2;
        p->keys[j] = -p->keys[j];
      };
      for ( j=2 ; j<p->num_vertexs ; j++ ) {
        if( p->keys[j] < 0 ) { 
          p->keys[j] = -p->keys[j];
          glBegin ( GL_LINE_LOOP );
          glVertex3fv ( pv[j-2].xyz );
          glVertex3fv ( pv[j-1].xyz );
          glVertex3fv ( pv[j].xyz );
          glEnd();
        }
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_polygons_as_lines ( call_def_parray p ) { 
    Tint       i,j,n,iv;
    tel_point  pv = p -> vertices;

    n = p->num_vertexs;
    j = (int)((1.-g_fSkipRatio)*n);
    while ( j-- ) {
      i = Rand() % n;
      p->keys[i] = -p->keys[i];
    };

    if( p->num_bounds > 0 ) {
      if( p->num_edges > 0 ) {
        for ( i=n=0 ; i<p->num_bounds ; i++ ) {
          glBegin ( GL_LINE_LOOP );
          for ( j=0 ; j<p->bounds[i] ; j++ ) {
            iv = p->edges[n+j];
            if( p->keys[iv] < 0 ) {
              p->keys[iv] = -p->keys[iv];
              glVertex3fv ( pv[iv].xyz );
            }
          }
          glEnd();
          n += p->bounds[i];
        }
      } else {  
        for ( i=n=0 ; i<p->num_bounds ; i++ ) {
          glBegin ( GL_LINE_LOOP );
          for ( j=0 ; j<p->bounds[i] ; j++ ) {
            if( p->keys[n+j] < 0 ) {
              p->keys[n+j] = -p->keys[n+j];
              glVertex3fv ( pv[n+j].xyz );
            }
          }
          glEnd();
          n += p->bounds[i];
        }
      }
    } else if( p->num_edges > 0 ) {
      glBegin ( GL_LINE_LOOP );
      for ( j=0 ; j<p->num_edges ; j++ ) {
        iv = p->edges[j];
        if( p->keys[iv] < 0 ) {
          p->keys[iv] = -p->keys[iv];
          glVertex3fv ( pv[iv].xyz );
        }
      }
      glEnd();
    } else {
      glBegin ( GL_LINE_LOOP );
      for ( j=0 ; j<p->num_vertexs ; j++ ) {
        if( p->keys[j] < 0 ) {
          p->keys[j] = -p->keys[j];
          glVertex3fv ( pv[j].xyz );
        }
      }
      glEnd();
    }

}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_quadrangles_as_lines ( call_def_parray p ) { 

    Tint       i,j,n,iv;
    tel_point  pv = p -> vertices;

    n = p->num_vertexs/4;
    j = (int)((1.-g_fSkipRatio)*n);
    while ( j-- ) {
      i = Rand() % n; i *= 4;
      p->keys[i] = -p->keys[i];
    };

    if( p->num_edges > 0 ) {
      for ( j=0 ; j<p->num_edges ; j+=4 ) {
        iv = p->edges[j];
        if( p->keys[iv] < 0 ) {
          p->keys[iv] = -p->keys[iv];
          glBegin ( GL_LINE_LOOP );
          for ( i=0 ; i<4 ; i++ ) {
            iv = p->edges[j+i];
            glVertex3fv ( pv[iv].xyz );
          }
          glEnd();
        }
      }
    } else {
      for ( j=0 ; j<p->num_vertexs ; j+=4 ) {
        if( p->keys[j] < 0 ) {
          p->keys[j] = -p->keys[j];
          glBegin ( GL_LINE_LOOP );
          for ( i=0 ; i<4 ; i++ ) {
            glVertex3fv ( pv[j+i].xyz );
          }
          glEnd();
        }
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_quadranglestrips_as_lines ( call_def_parray p ) { 

    Tint       i,j,k,n,ni;
    tel_point  pv = p -> vertices;

    if( p->num_bounds > 0 ) {
      for ( i=n=0 ; i<p->num_bounds ; i++ ) {
        ni = p->bounds[i]/2-2;
        k = (int)((1.-g_fSkipRatio)*ni);
        while ( k-- ) {
          j = Rand() % ni; j = j*2+2;
          p->keys[n+j] = -p->keys[n+j];
        };
        for ( j=3 ; j<p->bounds[i] ; j+=2 ) {
          if( p->keys[n+j] < 0 ) {
            p->keys[n+j] = -p->keys[n+j];
            glBegin ( GL_LINE_LOOP );
            glVertex3fv ( pv[n+j-3].xyz );
            glVertex3fv ( pv[n+j-2].xyz );
            glVertex3fv ( pv[n+j-1].xyz );
            glVertex3fv ( pv[n+j].xyz );
            glEnd();
          }
        }
        n += p->bounds[i];
      }
    } else {
      ni = p->num_vertexs/2-2;
      k = (int)((1.-g_fSkipRatio)*ni);
      while ( k-- ) {
        j = Rand() % ni; j = j*2+2;
        p->keys[j] = -p->keys[j];
      };
      for ( j=3 ; j<p->num_vertexs ; j+=2 ) {
        if( p->keys[j] < 0 ) {
          p->keys[j] = -p->keys[j];
          glBegin ( GL_LINE_LOOP );
          glVertex3fv ( pv[j-3].xyz );
          glVertex3fv ( pv[j-2].xyz );
          glVertex3fv ( pv[j-1].xyz );
          glVertex3fv ( pv[j].xyz );
          glEnd();
        }
      }
    }
}  

/*----------------------------------------------------------------------*/
static void draw_degenerates_as_lines ( call_def_parray p, 
                tel_colour edge_colour ) {

      GLint renderMode;

    GLboolean zbuff_state = glIsEnabled(GL_DEPTH_TEST);

    LightOff ();

    if( zbuff_state ) glDisable(GL_DEPTH_TEST); 

    glColor3fv( edge_colour->rgb );

    if( g_fSkipRatio != 0 ) switch( draw_mode ) {
      case GL_POINTS:
        draw_degenerates_points_as_points( p );
        break;
      case GL_LINES:
        draw_degenerates_lines_as_lines( p );
        break;
      case GL_LINE_STRIP:
      case GL_POLYGON:
        draw_degenerates_polygons_as_lines( p );
        break;
      case GL_TRIANGLES:
        draw_degenerates_triangles_as_lines( p );
        break;
      case GL_QUADS:
        draw_degenerates_quadrangles_as_lines( p );
        break;
      case GL_TRIANGLE_FAN:
      case GL_TRIANGLE_STRIP:
        draw_degenerates_trianglestrips_as_lines( p );
        break;
      case GL_QUAD_STRIP:
        draw_degenerates_quadranglestrips_as_lines( p );
        break;
      default:
        break;
    }
    else {
      int i,n;

#ifdef OCC3192
      GLboolean color_array_mode, 
                edge_flag_array_mode,
                index_array_mode,
                normal_array_mode,
                texture_coord_array_mode,
                vertex_array_mode;
#endif
      glPushAttrib( GL_POLYGON_BIT );
      glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );

#ifdef OCC3192
      color_array_mode         = glIsEnabled( GL_COLOR_ARRAY );
      edge_flag_array_mode     = glIsEnabled( GL_EDGE_FLAG_ARRAY );
      index_array_mode         = glIsEnabled( GL_INDEX_ARRAY );
      normal_array_mode        = glIsEnabled( GL_NORMAL_ARRAY );
      texture_coord_array_mode = glIsEnabled( GL_TEXTURE_COORD_ARRAY );
      vertex_array_mode        = glIsEnabled( GL_VERTEX_ARRAY );

      glDisableClientState( GL_COLOR_ARRAY );
      glDisableClientState( GL_EDGE_FLAG_ARRAY );
      glDisableClientState( GL_INDEX_ARRAY );
      glDisableClientState( GL_NORMAL_ARRAY );
      glDisableClientState( GL_TEXTURE_COORD_ARRAY );

      if( !vertex_array_mode ) glEnableClientState( GL_VERTEX_ARRAY );
#else
      glEnableClientState( GL_VERTEX_ARRAY );
#endif
      glVertexPointer(3, GL_FLOAT, 0, p->vertices); /* array of vertices  */

        glGetIntegerv( GL_RENDER_MODE, &renderMode );

      if( p->num_bounds > 0 ) {
        if( p->num_edges > 0 ) {
          for( i=n=0 ; i<p->num_bounds ; i++ ) {
                  if( renderMode == GL_FEEDBACK )
                        draw_primitive_elements( p, draw_mode, p->bounds[i], 
                                GL_UNSIGNED_INT, (GLenum*) &p->edges[n]);
                  else
                        glDrawElements( draw_mode, p->bounds[i],
                                GL_UNSIGNED_INT, &p->edges[n]);
            n += p->bounds[i];
          }
        } else {
          for( i=n=0 ; i<p->num_bounds ; i++ ) {
                  if( renderMode == GL_FEEDBACK )
                        draw_primitive_array( p, draw_mode, n, p->bounds[i]);
                  else
                        glDrawArrays( draw_mode, n, p->bounds[i]);
            n += p->bounds[i];
          }
        }
      } else if( p->num_edges > 0 ) {
            if( renderMode == GL_FEEDBACK )
                  draw_primitive_elements( p, draw_mode, p->num_edges, 
                                GL_UNSIGNED_INT, (GLenum*) p->edges);
            else
                  glDrawElements( draw_mode, p->num_edges,
                                GL_UNSIGNED_INT, p->edges);
      } else {
            if( renderMode == GL_FEEDBACK )
                  draw_primitive_array( p, draw_mode, 0, p->num_vertexs);
            else
                  glDrawArrays( draw_mode, 0, p->num_vertexs);
      }

#ifdef OCC3192
      if( !vertex_array_mode ) glDisableClientState( GL_VERTEX_ARRAY );

      if( color_array_mode )         glEnableClientState( GL_COLOR_ARRAY );
      if( edge_flag_array_mode )     glEnableClientState( GL_EDGE_FLAG_ARRAY );
      if( index_array_mode )         glEnableClientState( GL_INDEX_ARRAY );
      if( normal_array_mode )        glEnableClientState( GL_NORMAL_ARRAY );
      if( texture_coord_array_mode ) glEnableClientState( GL_TEXTURE_COORD_ARRAY );
#endif
      glPopAttrib();
    }

    if( zbuff_state ) glEnable(GL_DEPTH_TEST); 

}  

static void draw_degenerates_as_bboxs ( call_def_parray p, 
                tel_colour edge_colour ) {

   Tint      i;
   GLfloat   minp[ 3 ] = { FLT_MAX, FLT_MAX, FLT_MAX };
   GLfloat   maxp[ 3 ] = { FLT_MIN, FLT_MIN, FLT_MIN };
   tel_point pv = p -> vertices;

   LightOff ();

   glColor3fv( edge_colour->rgb );

   for ( i=0 ; i<p->num_vertexs ; ++i ) {
     if ( pv[  i  ].xyz[ 0 ] < minp[ 0 ] )
       minp[ 0 ] = pv[  i  ].xyz[ 0 ] ;
     if ( pv[  i  ].xyz[ 1 ] < minp[ 1 ] )
       minp[ 1 ] = pv[  i  ].xyz[ 1 ] ;
     if ( pv[  i  ].xyz[ 2 ] < minp[ 2 ] )
       minp[ 2 ] = pv[  i  ].xyz[ 2 ] ;

     if ( pv[  i  ].xyz[ 0 ] > maxp[ 0 ] )
       maxp[ 0 ] = pv[  i  ].xyz[ 0 ] ;
     if ( pv[  i  ].xyz[ 1 ] > maxp[ 1 ] )
       maxp[ 1 ] = pv[  i  ].xyz[ 1 ] ;
     if ( pv[  i ].xyz[ 2 ] > maxp[ 2 ] )
       maxp[ 2 ] = pv[  i  ].xyz[ 2 ] ;
   }  /* end for ( i ) */

   glBegin ( GL_LINE_STRIP );

   glVertex3fv ( minp );
   glVertex3f ( minp[ 0 ], maxp[ 1 ], minp[ 2 ] );
   glVertex3f ( minp[ 0 ], maxp[ 1 ], maxp[ 2 ] );
   glVertex3f ( minp[ 0 ], minp[ 1 ], maxp[ 2 ] );
   glVertex3f ( minp[ 0 ], minp[ 1 ], minp[ 2 ] );

   glVertex3f ( maxp[ 0 ], minp[ 1 ], minp[ 2 ] );
   glVertex3f ( maxp[ 0 ], maxp[ 1 ], minp[ 2 ] );
   glVertex3f ( maxp[ 0 ], maxp[ 1 ], maxp[ 2 ] );
   glVertex3f ( maxp[ 0 ], minp[ 1 ], maxp[ 2 ] );
   glVertex3f ( maxp[ 0 ], minp[ 1 ], minp[ 2 ] );

   glVertex3f ( maxp[ 0 ], minp[ 1 ], maxp[ 2 ] );
   glVertex3f ( minp[ 0 ], minp[ 1 ], maxp[ 2 ] );
   glVertex3f ( minp[ 0 ], maxp[ 1 ], maxp[ 2 ] );
   glVertex3fv ( maxp );
   glVertex3f ( maxp[ 0 ], maxp[ 1 ], minp[ 2 ] );
   glVertex3f ( minp[ 0 ], maxp[ 1 ], minp[ 2 ] );

   glEnd();

}  /* end draw_degenerates_as_bboxs */

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