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OpenGl_tmesh.c

#define G003
#define G004
/***********************************************************************

     FONCTION :
     ----------
        File OpenGl_tmesh :
 

     REMARQUES:
     ---------- 
      
      Le culling et le backfacing ne marchent pas.
      

     HISTORIQUE DES MODIFICATIONS   :
     --------------------------------
       xx-xx-xx : xxx ; Creation.
       11-03-96 : FMN ; Correction warning compilation
       01-04-96 : CAL ; Integration MINSK portage WNT
       22-04-96 : FMN ; Suppression prototype inutile.
       09-08-96 : FMN ; Suppression appel glMatrixMode() avant glGetFloatv()
       21-10-96 : FMN ; Suppression LMC_COLOR fait dans OpenGl_execstruct.c
       30-06-97 : FMN ; Suppression OpenGl_telem_light.h
       18-07-97 : FMN ; Ajout desactivation des lights suivant front_lighting_model
       21-07-97 : FMN ; Amelioration des performances OPTIMISATION_FMN
                  - suppression calcul inutile sur les front faces
                  - utilisation de GL_LINE_LOOP
       27-08-97 : FMN ; Correction affichage des edges
                  On n'affiche que les edges dans le mode IS_EMPTY
       10-09-97 : FMN ; Amelioration des perfs liees aux lights.
       15-09-97 : PCT ; Ajout coordonnees textures
       24-09-97 : FMN ; Suppression OPTIMISATION_FMN.
       08-12-97 : FMN ; Suppression appel TsmGetAttri inutile.
       23-12-97 : FMN ; Suppression IsBackFace()
       31-12-97 : FMN ; Simplification pour le highlight
       15-01-98 : FMN ; Ajout Hidden line
       16-02-00 : EUG ; Degeneration support
       16-02-00 : EUG ; Bitmap drawing support
       08-03-01 : GG  ; BUC60823 Avoid crash in the normal computation method
                              on confuse point.

************************************************************************/

#define BUC60876        /* GG 5/4/2001 Disable local display list
//                      when animation is not required
*/

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

#define OCC4298 // SAN : 12/11/2003 : Memory beyond array bound read in TriangleMeshAdd()
/*
 * Includes
 */ 

#include <OpenGl_tgl_all.h>

#include <stddef.h>
#include <stdio.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>

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

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

#ifdef G003
# 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 */

# ifdef G004
extern GLboolean g_fBitmap;
# endif /* G004 */

extern int   g_nDegenerateModel;
extern float g_fSkipRatio;
extern GLboolean g_fAnimation;

#endif  /* G003 */
   
/*----------------------------------------------------------------------*/

typedef struct
{
   Tint       num_facets; /* Number of facets */
   Tint       facet_flag; /* TEL_FA_NONE or TEL_FA_NORMAL */
   Tint       vertex_flag;/* TEL_VT_NONE or TEL_VT_NORMAL */
   tel_point  fnormals;   /* length = num_facets */
   tel_colour fcolours;   /* length = num_facets */
   tel_point  vertices;   /* length = num_facets + 2 */
   tel_colour vcolours;   /* length = num_facets + 2 */
   tel_point  vnormals;   /* length = num_facets + 2 */
   tel_texture_coord vtexturecoord; /* Texture coordinates */
#ifdef G003
   DS_INTERNAL d;
#endif  /* G003 */
} TEL_TMESH_DATA, *tel_tmesh_data;

static  TStatus  TriangleMeshDisplay( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  TriangleMeshAdd( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  TriangleMeshDelete( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  TriangleMeshPrint( TSM_ELEM_DATA, Tint, cmn_key* );
static  TStatus  TriangleMeshInquire( TSM_ELEM_DATA, Tint, cmn_key* );

static void draw_tmesh( tel_tmesh_data,
                        Tint,          /* highlight flag        */
                        Tint,          /* front_lighting_model, */
                        Tint,          /* interior_style,       */
                        tel_colour     /* edge_colour,          */
                     );
#ifndef G003
static void draw_edges( tel_tmesh_data, tel_colour, Tint);
#else
static void draw_edges                 ( tel_tmesh_data, tel_colour, Tint, Tint );
       void draw_degenerates_as_points ( PDS_INTERNAL, tel_point, Tint          );
       void draw_degenerates_as_bboxs  ( PDS_INTERNAL, tel_point, Tint          );
extern void set_drawable_items         ( GLboolean*, int                        );
#endif  /* G003 */

static void draw_line_loop ( tel_tmesh_data );

static TStatus ( *MtdTbl[] )( TSM_ELEM_DATA, Tint, cmn_key* ) = {

                TriangleMeshDisplay, /* PickTraverse */
                TriangleMeshDisplay,
                TriangleMeshAdd,
                TriangleMeshDelete,
                TriangleMeshPrint,
                TriangleMeshInquire

               };

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

MtblPtr TelTriangleMeshInitClass ( TelType* el ) {

 *el = TelTriangleMesh;

 return MtdTbl;

}  /* end TelTriangleMeshInitClass */

/*----------------------------------------------------------------------*/
static  TStatus
TriangleMeshAdd( TSM_ELEM_DATA d, Tint n, cmn_key *k )
 /* expects keys
       NUM_FACETS_ID
       FNORMALS_ID
       FACET_COLOUR_VALS_ID
       VERTICES_ID
       VERTEX_COLOUR_VALS_ID
       VNORMALS_ID
       VTEXTURECOORD_ID */
{
    Tint i, j;
    tel_tmesh_data  data;

    for( i = 0; i < n; i++ )
    {
       if( k[i]->id == NUM_FACETS_ID )
           break;
    }
    if( i == n )
         return TFailure;

    if( !(k[i]->data.ldata) )
        return TFailure;

    data = cmn_getmem( 1, sizeof(TEL_TMESH_DATA), 1 );
    if( !data )
        return TFailure;

    data->num_facets = k[i]->data.ldata;
    data->vtexturecoord = 0;

    for( i = 0; i < n; i++ )
    {
       switch( k[i]->id )
       {
          case FNORMALS_ID:
          {
             data->facet_flag = TEL_FA_NORMAL;
             data->fnormals = cmn_getmem( 1, data->num_facets *
                                                  sizeof(TEL_POINT), 1 );
             cmn_memcpy( data->fnormals, k[i]->data.pdata, data->num_facets *
                                                           sizeof(TEL_POINT) );
             for( j = 0; j < data->num_facets; j++ )
                vecnrm( data->fnormals[j].xyz );
             break;
          }
          case FACET_COLOUR_VALS_ID:
          {
             data->fcolours = cmn_getmem( 1, data->num_facets *
                                                  sizeof(TEL_COLOUR), 1 );
             cmn_memcpy( data->fcolours, k[i]->data.pdata, data->num_facets *
                                                           sizeof(TEL_COLOUR) );
             break;
          }
          case VERTICES_ID:
          {
             data->vertices = cmn_getmem( 1, (data->num_facets + 2) *
                                                  sizeof(TEL_POINT), 1 );
             cmn_memcpy( data->vertices, k[i]->data.pdata,
                         (data->num_facets+2) * sizeof(TEL_POINT) );
             break;
          }
          case VERTEX_COLOUR_VALS_ID:
          {
             data->vcolours = cmn_getmem( 1, (data->num_facets + 2) *
                                                  sizeof(TEL_COLOUR), 1 );
             cmn_memcpy( data->vcolours, k[i]->data.pdata,
                         (data->num_facets+2) * sizeof(TEL_COLOUR) );

             break;
          }
          case VNORMALS_ID:
          {
             data->vertex_flag = TEL_VT_NORMAL;
             data->vnormals = cmn_getmem( 1, (data->num_facets + 2) *
                                                  sizeof(TEL_POINT), 1 );
             cmn_memcpy( data->vnormals, k[i]->data.pdata,
                         (data->num_facets+2) * sizeof(TEL_POINT) );
             for( j = 0; j < (data->num_facets+2); j++ )
                vecnrm( data->vnormals[j].xyz );
             break;
          }
          case VTEXTURECOORD_ID:
          {
            data->vtexturecoord = cmn_getmem(1, (data->num_facets + 2) *
                                                sizeof(TEL_TEXTURE_COORD), 1);
            cmn_memcpy(data->vtexturecoord, k[i]->data.pdata,
                       (data->num_facets+2) * sizeof(TEL_TEXTURE_COORD) );
            break;
          }

          default:
          {
             break;
          }
       }
    }

    if( data->facet_flag != TEL_FA_NORMAL )
    {
        /* calculate the normals and store */

        data->fnormals = cmn_getmem( 1, data->num_facets *
                                                  sizeof(TEL_POINT), 1 );
        for( i = 0; i < data->num_facets; i++ ) {
           if( i & 1 ) {
               TelGetNormal( data->vertices[i].xyz, data->vertices[i+2].xyz,
                             data->vertices[i+1].xyz, data->fnormals[i].xyz );
           } else {
               TelGetNormal( data->vertices[i].xyz, data->vertices[i+1].xyz,
                             data->vertices[i+2].xyz, data->fnormals[i].xyz );
           }
        }
#ifndef BUC60823
        for( j = 0; j < data->num_facets; j++ )
           vecnrm( data->fnormals[j].xyz );
#endif
    }
    if( data->vertex_flag != TEL_VT_NORMAL )
    {
       /* calculate the vertex normals */
        data->vnormals = cmn_getmem( 1, (data->num_facets+2) *
                                                  sizeof(TEL_POINT), 1 );
       for( i = 2; i < data->num_facets; i++ )
       {
          data->vnormals[i].xyz[0] = ( data->fnormals[i-2].xyz[0] +
                                       data->fnormals[i-1].xyz[0] +
                                       data->fnormals[ i ].xyz[0] ) / ( float )3.0;
          data->vnormals[i].xyz[1] = ( data->fnormals[i-2].xyz[1] +
                                       data->fnormals[i-1].xyz[1] +
                                       data->fnormals[ i ].xyz[1] ) / ( float )3.0;
          data->vnormals[i].xyz[2] = ( data->fnormals[i-2].xyz[2] +
                                       data->fnormals[i-1].xyz[2] +
                                       data->fnormals[ i ].xyz[2] ) / ( float )3.0;
       }
       data->vnormals[0] = data->fnormals[0];
#ifdef OCC4298
       if( data->num_facets > 1 )
       {
#endif
       data->vnormals[1].xyz[0] = ( data->fnormals[0].xyz[0] +
                                    data->fnormals[1].xyz[0] )/( float )2.0;
       data->vnormals[1].xyz[1] = ( data->fnormals[0].xyz[1] +
                                    data->fnormals[1].xyz[1] )/( float )2.0;
       data->vnormals[1].xyz[2] = ( data->fnormals[0].xyz[2] +
                                    data->fnormals[1].xyz[2] )/( float )2.0;
#ifdef OCC4298
       }
       else
          data->vnormals[1] = data->fnormals[0];
#endif
       /* last vertex */
       data->vnormals[data->num_facets+1] = data->fnormals[data->num_facets-1];

       /* second last vertex */
#ifdef OCC4298
       if( data->num_facets > 1 )
       {
#endif
       data->vnormals[data->num_facets].xyz[0] =
                        ( data->fnormals[data->num_facets-1].xyz[0]  +
                          data->fnormals[data->num_facets-2].xyz[0]  ) / ( float )2.0;
       data->vnormals[data->num_facets].xyz[1] =
                        ( data->fnormals[data->num_facets-1].xyz[1]  +
                          data->fnormals[data->num_facets-2].xyz[1]  ) / ( float )2.0;
       data->vnormals[data->num_facets].xyz[2] =
                        ( data->fnormals[data->num_facets-1].xyz[2]  +
                          data->fnormals[data->num_facets-2].xyz[2]  ) / ( float )2.0;
#ifdef OCC4298
       }
#endif
    }
#ifdef G003
    data -> d.list      =  0;
    data -> d.dlist     =  0;
    data -> d.degMode   =  0;
    data -> d.model     = -1;
    data -> d.skipRatio =  0.0F;
    data -> d.bDraw     =  ( GLboolean* )cmn_getmem (
                                          data -> num_facets + 2, sizeof ( GLboolean ), 0
                                         );
#endif  /* G003 */
    ((tsm_elem_data)(d.pdata))->pdata = data;

    return TSuccess;
}
/*----------------------------------------------------------------------*/

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

   Tint           front_lighting_model;
   Tint           interior_style;
   TEL_COLOUR     interior_colour;
   TEL_COLOUR     edge_colour;

   tel_tmesh_data d;

   k12.id          = TelInteriorReflectanceEquation;
   k17.id          = TelInteriorStyle;
   k111.id         = TelInteriorColour;
   k111.data.pdata = &interior_colour;
   k114.id         = TelEdgeColour;
   k114.data.pdata = &edge_colour;

   TsmGetAttri( 4, &k12, &k17, &k111, &k114);

   front_lighting_model     = k12.data.ldata;
   interior_style           = k17.data.ldata;
   
#ifdef PRINT
   printf("TriangleMeshDisplay \n");
#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 = 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 = hrep.col;
                front_lighting_model = CALL_PHIGS_REFL_NONE;
             }
            else if( hrep.type == TelHLColour )
            {
                edge_colour = hrep.col;
                k[0]->id = TOff;
            }
        }
   }

    d = data.pdata;

    glColor3fv( interior_colour.rgb );
    
    draw_tmesh( d, k[0]->id,
               front_lighting_model, 
               interior_style, 
               &edge_colour);

 return TSuccess;

}

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

static void draw_tmesh (
             tel_tmesh_data                   p,
             Tint                         hflag,
             Tint          front_lighting_model,
             Tint                interior_style,
             tel_colour             edge_colour
            ) {

 Tint              i, newList = 0;
 tel_point         pv, pfn, pvn;
 tel_colour        pfc, pvc;
 tel_texture_coord pvt;

 pfn = p -> fnormals;
 pfc = p -> fcolours;
 pv  = p -> vertices;
 pvc = p -> vcolours;
 pvn = p -> vnormals;
 pvt = p -> vtexturecoord;

 if ( hflag ) pvc = pfc = 0;
#ifdef G003
 if ( g_nDegenerateModel < 2 && interior_style != TSM_EMPTY ) {
#else
 if( interior_style != TSM_EMPTY ) {
#endif  /* G003 */
  if ( front_lighting_model == CALL_PHIGS_REFL_NONE )

   LightOff ();

  else LightOn ();
#ifdef G003
#ifdef BUC60876
     if ( !g_fAnimation )
                goto doDraw; /* Disable object display list out of animation */
#endif
# ifdef G004
  if ( g_fBitmap ) goto doDraw;  /* display lists are NOT shared between */
                                 /*  window's context and bitmap's one   */
# endif  /* G004 */
  if ( p -> d.model != front_lighting_model || !p -> d.list ||
       p -> d.model == -1                                 ||
       ( g_nDegenerateModel && p -> d.skipRatio != g_fSkipRatio )
  ) {

   p -> d.skipRatio = g_fSkipRatio;
   p -> d.model     = front_lighting_model;
   p -> d.degMode   = g_nDegenerateModel;

   if ( g_fSkipRatio == 0.0 ) {

    if ( !p -> d.list ) p -> d.list = glGenLists ( 1 );

    glNewList ( p -> d.list, GL_COMPILE_AND_EXECUTE );
    newList = 1;
#endif  /* G003 */
#ifdef G004
doDraw:
#endif  /* G004 */
    glBegin ( GL_TRIANGLE_STRIP );

     if ( front_lighting_model == CALL_PHIGS_REFL_NONE ) {

      if ( pvc )

       for ( i = 0; i < p -> num_facets + 2; ++i ) {

        glColor3fv  ( pvc[ i ].rgb );
        glVertex3fv ( pv [ i ].xyz );

       }  /* end for */

      else if ( pfc ) {

       glColor3fv  ( pfc[ 0 ].rgb );
       glVertex3fv ( pv [ 0 ].xyz );
       glVertex3fv ( pv [ 1 ].xyz );

       for ( i = 2; i < p -> num_facets + 2; ++i ) {

        glColor3fv ( pfc[ i - 2 ].rgb );
        glVertex3fv( pv [ i     ].xyz );

       }  /* end for */

      } else for ( i = 0; i < p -> num_facets + 2; ++i ) glVertex3fv ( pv[ i ].xyz );

     } else {  /* front_lighting_model != TelLModelNone */

      if ( pvt && !ForbidSetTextureMapping )

       for ( i = 0; i < p -> num_facets + 2; ++i ) {

        glNormal3fv   ( pvn[ i ].xyz );
        glTexCoord2fv ( pvt[ i ].xy  );
        glVertex3fv   ( pv [ i ].xyz );

       }  /* end for */

      else for ( i = 0; i < p -> num_facets + 2; ++i ) {

            glNormal3fv( pvn[ i ].xyz );
            glVertex3fv( pv[  i ].xyz );

           }  /* end for */

     }  /* end else */

    glEnd ();
#ifdef G003
   } else if ( g_fSkipRatio != 1.0 ) {

    set_drawable_items ( p -> d.bDraw, p -> num_facets + 2 );

    if ( !p -> d.dlist ) p -> d.dlist = glGenLists ( 1 );

    glNewList ( p -> d.dlist, GL_COMPILE_AND_EXECUTE );
    newList = 1;

    glBegin ( GL_TRIANGLES );

     if ( front_lighting_model == CALL_PHIGS_REFL_NONE ) {

      if ( pvc ) {

       for ( i = 0; i < p -> num_facets; ++i ) {

        if ( p -> d.bDraw[ i ] ) {

         if ( i % 2 ) {

          glColor3fv  ( pvc[ i     ].rgb );
          glVertex3fv ( pv [ i     ].xyz );
          glColor3fv  ( pvc[ i + 2 ].rgb );
          glVertex3fv ( pv [ i + 2 ].xyz );
          glColor3fv  ( pvc[ i + 1 ].rgb );
          glVertex3fv ( pv [ i + 1 ].xyz );

         } else {

          glColor3fv  ( pvc[ i + 2 ].rgb );
          glVertex3fv ( pv [ i + 2 ].xyz );
          glColor3fv  ( pvc[ i     ].rgb );
          glVertex3fv ( pv [ i     ].xyz );
          glColor3fv  ( pvc[ i + 1 ].rgb );
          glVertex3fv ( pv [ i + 1 ].xyz );

         }  /* end else */
       } /* if */
      } /* for */

      } else if ( pfc ) {

       for ( i = 0; i < p -> num_facets; ++i ) {

        if ( p -> d.bDraw[ i ] ) {

         if ( i % 2 ) {

          glColor3fv ( pfc[ i     ].rgb );
          glVertex3fv( pv [ i     ].xyz );
          glColor3fv ( pfc[ i + 2 ].rgb );
          glVertex3fv( pv [ i + 2 ].xyz );
          glColor3fv ( pfc[ i + 1 ].rgb );
          glVertex3fv( pv [ i + 1 ].xyz );

         } else {

          glColor3fv ( pfc[ i + 2 ].rgb );
          glVertex3fv( pv [ i + 2 ].xyz );
          glColor3fv ( pfc[ i     ].rgb );
          glVertex3fv( pv [ i     ].xyz );
          glColor3fv ( pfc[ i + 1 ].rgb );
          glVertex3fv( pv [ i + 1 ].xyz );

         }  /* end else */
       }  /* if */
      } /* for */

      } else {
      for ( i = 0; i < p -> num_facets; ++i ) {

        if ( p -> d.bDraw[ i ] ) {

          if ( i % 2 ) {

            glVertex3fv ( pv[ i     ].xyz );
            glVertex3fv ( pv[ i + 2 ].xyz );
            glVertex3fv ( pv[ i + 1 ].xyz );
            
          } else {
            
            glVertex3fv ( pv[ i + 2 ].xyz );
            glVertex3fv ( pv[ i     ].xyz );
            glVertex3fv ( pv[ i + 1 ].xyz );
            
          }  /* end else */
        }  /* if */
      } /* for */
      }

     } else {  /* front_lighting_model != TelLModelNone */

      if ( pvt && !ForbidSetTextureMapping ) {

       for ( i = 0; i < p -> num_facets; ++i ) {

        if ( p -> d.bDraw[ i ] ) {

         if ( i % 2 ) {

          glNormal3fv   ( pvn[ i     ].xyz );
          glTexCoord2fv ( pvt[ i     ].xy  );
          glVertex3fv   ( pv [ i     ].xyz );
          glNormal3fv   ( pvn[ i + 2 ].xyz );
          glTexCoord2fv ( pvt[ i + 2 ].xy  );
          glVertex3fv   ( pv [ i + 2 ].xyz );
          glNormal3fv   ( pvn[ i + 1 ].xyz );
          glTexCoord2fv ( pvt[ i + 1 ].xy  );
          glVertex3fv   ( pv [ i + 1 ].xyz );

         } else {

          glNormal3fv   ( pvn[ i + 2 ].xyz );
          glTexCoord2fv ( pvt[ i + 2 ].xy  );
          glVertex3fv   ( pv [ i + 2 ].xyz );
          glNormal3fv   ( pvn[ i     ].xyz );
          glTexCoord2fv ( pvt[ i     ].xy  );
          glVertex3fv   ( pv [ i     ].xyz );
          glNormal3fv   ( pvn[ i + 1 ].xyz );
          glTexCoord2fv ( pvt[ i + 1 ].xy  );
          glVertex3fv   ( pv [ i + 1 ].xyz );

         }  /* end else */
       } /* if */
      }  /* end for */

      } else {
      for ( i = 0; i < p -> num_facets; ++i ) {

        if ( p -> d.bDraw[ i ] ) {
          
          if ( i % 2 ) {
            
              glNormal3fv( pvn[ i     ].xyz );
              glVertex3fv( pv[  i     ].xyz );
              glNormal3fv( pvn[ i + 2 ].xyz );
              glVertex3fv( pv[  i + 2 ].xyz );
              glNormal3fv( pvn[ i + 1 ].xyz );
              glVertex3fv( pv[  i + 1 ].xyz );
            
          } else {
            
              glNormal3fv( pvn[ i + 2 ].xyz );
              glVertex3fv( pv[  i + 2 ].xyz );
              glNormal3fv( pvn[ i     ].xyz );
              glVertex3fv( pv[  i     ].xyz );
              glNormal3fv( pvn[ i + 1 ].xyz );
              glVertex3fv( pv[  i + 1 ].xyz );

          }  /* end else */

        } /* if */
      } /* for */
      } /* end else */
     }  /* end else front_lighting_model != TelLModelNone */

    glEnd ();

   } else {

    if ( !p -> d.dlist ) p -> d.dlist = glGenLists ( 1 );

    glNewList ( p -> d.dlist, GL_COMPILE_AND_EXECUTE );
    newList = 1;

   }  /* end else */
   if ( newList ) glEndList ();

   if ( g_nDegenerateModel ) return;

  } else {

   glCallList ( g_fSkipRatio == 0.0 ? p -> d.list : p -> d.dlist );

   if ( g_nDegenerateModel ) return;

  }  /* end else */
#endif  /* G003 */
 }  /* end if ( interior_style != TSM_EMPTY ) */
#ifdef G003
 i = 0;

 /* OCC11904 -- Temporarily disable environment mapping */
 glPushAttrib(GL_ENABLE_BIT);
 glDisable(GL_TEXTURE_1D);
 glDisable(GL_TEXTURE_2D);

 switch ( g_nDegenerateModel ) {

  default:
  break;

  case 2:  /* XXX_TDM_WIREFRAME */
   i = 1;
  break;

  case 3:  /* XXX_TDM_MARKER */
   draw_degenerates_as_points ( &p -> d, p -> vertices, p -> num_facets + 2 );
  glPopAttrib();
  return;

  case 4:  /* XXX_TDM_BBOX */
   draw_degenerates_as_bboxs ( &p -> d, p -> vertices, p -> num_facets + 2 );
  glPopAttrib();
  return;

 }  /* end switch */

 draw_edges ( p, edge_colour, interior_style, i );
#else
 draw_edges ( p, edge_colour, interior_style    );
#endif  /* G003 */

 glPopAttrib();
}  /* end draw_tmesh */

/*----------------------------------------------------------------------*/
static  TStatus
TriangleMeshDelete( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
    tel_tmesh_data p;

    p = data.pdata;
    if( p->fnormals ) cmn_freemem( p->fnormals );
    if( p->fcolours ) cmn_freemem( p->fcolours );
    if( p->vertices ) cmn_freemem( p->vertices );
    if( p->vcolours ) cmn_freemem( p->vcolours );
    if( p->vnormals ) cmn_freemem( p->vnormals );
    if (p->vtexturecoord) cmn_freemem(p->vtexturecoord);
#ifdef G003
    if (  GET_GL_CONTEXT() != NULL  ) {

     if ( p ->  d.list ) glDeleteLists ( p ->  d.list, 1 );
     if ( p -> d.dlist ) glDeleteLists ( p -> d.dlist, 1 );

    }  /* end if */

    if ( p -> d.bDraw ) cmn_freemem ( p -> d.bDraw );
#endif  /* G003 */
    cmn_freemem( data.pdata );

    return TSuccess;
}

/*----------------------------------------------------------------------*/
static  TStatus
TriangleMeshPrint( TSM_ELEM_DATA data, Tint n, cmn_key *k )
{
    Tint           i;
    tel_tmesh_data p;

    p = data.pdata;

    fprintf(stdout, "TelTriangleMesh. Number of Facets : %d\n", p->num_facets);
    switch( p->facet_flag )
    {
       case TEL_FA_NONE:
          if( p->fcolours )
              fprintf( stdout, "\t\tFacet Flag : COLOUR\n" );
          else
              fprintf( stdout, "\t\tFacet Flag : NONE\n" );
          break;

       case TEL_FA_NORMAL:
          if( p->fcolours )
             fprintf( stdout, "\t\tFacet Flag : COLOURNORMAL\n" );
          else
             fprintf( stdout, "\t\tFacet Flag : NORMAL\n" );
          break;
    }

    switch( p->vertex_flag )
    {
       case TEL_VT_NONE:
          if( p->vcolours )
              fprintf( stdout, "\t\tVertex Flag : COLOUR\n" );
          else
              fprintf( stdout, "\t\tVertex Flag : NONE\n" );
          break;

       case TEL_VT_NORMAL:
          if( p->vcolours )
             fprintf( stdout, "\t\tVertex Flag : COLOURNORMAL\n" );
          else
             fprintf( stdout, "\t\tVertex Flag : NORMAL\n" );
          break;
    }
    if( p->fnormals )
    {
         fprintf( stdout, "\n\t\tFacet Normals : " );
         for( i = 0; i < p->num_facets; i++ )
            fprintf( stdout, "\n\t\t v[%d] = %g %g %g", i,
                                                        p->fnormals[i].xyz[0],
                                                        p->fnormals[i].xyz[1],
                                                        p->fnormals[i].xyz[2] );
    }
    else
       fprintf( stdout, "\n\t\tFacet Normals not specified\n" );

    if( p->fcolours )
    {
         fprintf( stdout, "\n\t\tFacet Colours : " );
         for( i = 0; i < p->num_facets; 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_facets+2; 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_facets+2; 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_facets+2; 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->vtexturecoord)
    {
      fprintf(stdout, "\n\t\tTexture Coordinates : ");
      for (i=0; i<p->num_facets+2; i++)
      fprintf(stdout, "\n\t\t v[%d] = %g %g", i,
            p->vtexturecoord[i].xy[0],
            p->vtexturecoord[i].xy[1]);
    }
    else
      fprintf( stdout, "\n\t\tTexture Coordinates not specified\n");

    fprintf( stdout, "\n" );

    return TSuccess;
}

/*----------------------------------------------------------------------*/
#ifndef G003
static void draw_edges ( tel_tmesh_data p, tel_colour edge_colour, Tint interior_style ) {
#else
static void draw_edges (
             tel_tmesh_data           p,
             tel_colour     edge_colour,
             Tint        interior_style,
             Tint             forceDraw
            ) {
#endif  /* G003 */
 CMN_KEY   k, k1, k2, k3, k4;
 Tint      i, edge_type, line_type_preserve, newList = 0;
 Tfloat    edge_width, line_width_preserve;
 GLboolean texture_on;
 tel_point pv;
#ifdef G003
 if ( interior_style != TSM_HIDDENLINE && !forceDraw ) {
#else
 if ( interior_style != TSM_HIDDENLINE ) {
#endif  /* G003 */     

  k.id = TelEdgeFlag;
  TsmGetAttri ( 1, &k );

  if ( k.data.ldata == TOff ) return;

 }  /* end if */
    
 pv = p -> vertices;
    
 LightOff ();
 texture_on = IsTextureEnabled ();
 if ( texture_on ) DisableTexture ();
    
 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 );

 }  /* end if */

 if ( line_type_preserve != edge_type ) {

  k.id         = TelPolylineType;
  k.data.ldata = edge_type;
  TsmSetAttri ( 1, &k );

 }  /* end if */
    
 glColor3fv ( edge_colour -> rgb );
#ifdef G003
 if ( !forceDraw )
#endif  /* G003 */
  draw_line_loop ( p );
#ifdef G003
 else {
#ifdef BUC60876
  if ( !g_fAnimation )
                goto doDraw; /* Disable object display list out of animation */
#endif
# ifdef G004
  if ( g_fBitmap ) 
            goto doDraw;
# endif  /* G004 */
  if ( p -> d.degMode != 2 || p -> d.skipRatio != g_fSkipRatio || !p -> d.dlist ) {

   if ( !p -> d.dlist ) p -> d.dlist = glGenLists ( 1 );

   p -> d.degMode   = 2;
   p -> d.skipRatio = g_fSkipRatio;
   glNewList ( p -> d.dlist, GL_COMPILE_AND_EXECUTE );
   newList = 1;
doDraw:
    glPushAttrib ( GL_DEPTH_BUFFER_BIT );
     glDisable ( GL_DEPTH_TEST );

     if ( g_fSkipRatio == 0.0 )

      draw_line_loop ( p );

     else if ( g_fSkipRatio != 1.0 ) {

      set_drawable_items ( p -> d.bDraw, p -> num_facets + 2 );

      for ( i = 0; i < p -> num_facets; ++i )

       if ( p -> d.bDraw[ i ] ) {

        glBegin ( GL_LINE_LOOP );
         glVertex3fv ( pv[ i     ].xyz );
         glVertex3fv ( pv[ i + 1 ].xyz );
         glVertex3fv ( pv[ i + 2 ].xyz );
        glEnd();

       }  /* end if */

     }  /* end if */

    glPopAttrib ();
    if ( newList ) glEndList ();

  } else glCallList ( p -> d.dlist );

 }  /* end else */
#endif  /* G003 */
 if ( line_width_preserve != edge_width ) {

  k.id         = TelPolylineWidth;
  k.data.fdata = line_width_preserve;
  TsmSetAttri ( 1, &k );

 }  /* end if */

 if ( line_type_preserve != edge_type ) {

  k.id         = TelPolylineType;
  k.data.ldata = line_type_preserve;
  TsmSetAttri ( 1, &k );

 }  /* end if */

 if ( texture_on ) EnableTexture ();

}  /* end draw_edges */
#ifdef G003
void draw_degenerates_as_points ( PDS_INTERNAL pd, tel_point p, Tint n ) {

 int i, newList = 0; 

 LightOff ();
#ifdef BUC60876
 if ( !g_fAnimation )
                goto doDraw; /* Disable object display list out of animation */
#endif
#ifdef G004
 if ( g_fBitmap ) 
            goto doDraw;
#endif  /* G004 */
 if ( pd -> degMode != 3 || pd -> skipRatio != g_fSkipRatio || !pd -> dlist ) {

  if ( !pd -> dlist ) pd -> dlist = glGenLists ( 1 );

  pd -> degMode   = 3;
  pd -> skipRatio = g_fSkipRatio;
  glNewList ( pd -> dlist, GL_COMPILE_AND_EXECUTE );
  newList = 1;

   if ( g_fSkipRatio == 0.0 ) {
#ifdef G004
doDraw:
#endif  /* G004 */
    glBegin ( GL_POINTS );

     for ( i = 0; i < n; ++i ) glVertex3fv ( p[ i ].xyz );

    glEnd ();

   } else if ( g_fSkipRatio != 1.0 ) {

    set_drawable_items ( pd -> bDraw, n );

    glBegin ( GL_POINTS );

     for ( i = 0; i < n; ++i )

      if ( pd -> bDraw[ i ] ) glVertex3fv ( p[ i ].xyz );

    glEnd ();

   }  /* end if */
   if ( newList ) glEndList ();

 } else glCallList ( pd -> dlist );

}  /* end draw_degenerates_as_points */

void draw_degenerates_as_bboxs ( PDS_INTERNAL pd, tel_point p, Tint n ) {

 int     i, newList = 0;
 GLfloat minp[ 3 ] = { FLT_MAX, FLT_MAX, FLT_MAX };
 GLfloat maxp[ 3 ] = { FLT_MIN, FLT_MIN, FLT_MIN };

 LightOff ();
#ifdef BUC60876
 if ( !g_fAnimation )
                goto doDraw; /* Disable object display list out of animation */
#endif
#ifdef G004
 if ( g_fBitmap ) 
            goto doDraw;
#endif  /* G004 */
 if ( pd -> degMode != 4 || !pd -> dlist ) {

  if ( !pd -> dlist ) pd -> dlist = glGenLists ( 1 );

  pd -> degMode = 4;

  glNewList ( pd -> dlist, GL_COMPILE_AND_EXECUTE );
  newList = 1; 
#ifdef G004
doDraw:
#endif  /* G004 */
   for ( i = 0; i < n; ++i ) {

    TEL_POINT pt = p[ i ];

    if ( pt.xyz[ 0 ] < minp[ 0 ] )
     minp[ 0 ] = pt.xyz[ 0 ] ;
    if ( pt.xyz[ 1 ] < minp[ 1 ] )
     minp[ 1 ] = pt.xyz[ 1 ] ;
    if ( pt.xyz[ 2 ] < minp[ 2 ] )
     minp[ 2 ] = pt.xyz[ 2 ] ;

    if ( pt.xyz[ 0 ] > maxp[ 0 ] )
     maxp[ 0 ] = pt.xyz[ 0 ] ;
    if ( pt.xyz[ 1 ] > maxp[ 1 ] )
      maxp[ 1 ] = pt.xyz[ 1 ] ;
    if ( pt.xyz[ 2 ] > maxp[ 2 ] )
     maxp[ 2 ] = pt.xyz[ 2 ] ;

   }  /* end for */

   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();
   if ( newList ) glEndList ();

 } else glCallList ( pd -> dlist );

}  /* end draw_degenerates_as_bboxs */
#endif  /* G003 */

static void draw_line_loop ( tel_tmesh_data p ) {

 int i;

 for ( i = 0; i < p -> num_facets; ++i ) {

  glBegin ( GL_LINE_LOOP );
   glVertex3fv ( p -> vertices[ i     ].xyz );
   glVertex3fv ( p -> vertices[ i + 1 ].xyz );
   glVertex3fv ( p -> vertices[ i + 2 ].xyz );
  glEnd();

 }  /* end for */

}  /* end draw_line_loop */

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

   d = data.pdata;

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

   if( d->facet_flag == TEL_FA_NORMAL )
       size_reqd += ( d->num_facets * sizeof( TEL_POINT ) );

   size_reqd += ( (d->num_facets+2) * sizeof( TEL_POINT ) );

   if( d->vcolours )
      size_reqd += ( (d->num_facets+2) * sizeof( TEL_COLOUR ) );

   if( d->vertex_flag == TEL_VT_NORMAL )
      size_reqd += ( (d->num_facets+2) * 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->trianglestrip3data.num_facets = d->num_facets;

            if( c->size >= size_reqd )
            {
                if( d->facet_flag == TEL_FA_NORMAL )
                {
                   if( d->fcolours )
                   {
                      w->trianglestrip3data.fctflag = TEL_FAFLAG_COLOURNORMAL;
                      w->trianglestrip3data.gnormals = (tel_point)(c->buf);
                      for( j = 0; j < d->num_facets; j++ )
                      {
                         w->trianglestrip3data.gnormals[j] = d->fnormals[j];
                      }
                      cur_ptr += ( d->num_facets * sizeof( TEL_POINT ) );

                      w->trianglestrip3data.facet_colour_vals =
                                                          (tel_colour)(cur_ptr);
                      for( j = 0; j < d->num_facets; j++ )
                      {
                         w->trianglestrip3data.facet_colour_vals[j] =
                                                          d->fcolours[j];
                      }
                      cur_ptr += ( d->num_facets * sizeof( TEL_COLOUR ) );
                   }
                   else
                   {
                      w->trianglestrip3data.fctflag = TEL_FAFLAG_NORMAL;
                      w->trianglestrip3data.facet_colour_vals = 0;
                      w->trianglestrip3data.gnormals = (tel_point)(c->buf);
                      for( j = 0; j < d->num_facets; j++ )
                      {
                         w->trianglestrip3data.gnormals[j] = d->fnormals[j];
                      }
                      cur_ptr += ( d->num_facets * sizeof( TEL_POINT ) );
                   }
                }
                else
                {
                   w->trianglestrip3data.gnormals = 0;
                   if( d->fcolours )
                   {
                      w->trianglestrip3data.fctflag = TEL_FAFLAG_COLOUR;
                      w->trianglestrip3data.facet_colour_vals =
                                                          (tel_colour)(c->buf );
                      for( j = 0; j < d->num_facets; j++ )
                      {
                         w->trianglestrip3data.facet_colour_vals[j] =
                                                          d->fcolours[j];
                      }
                      cur_ptr += ( d->num_facets * sizeof( TEL_COLOUR ) );
                   }
                   else
                   {
                      w->trianglestrip3data.fctflag = TEL_FAFLAG_NONE;
                      w->trianglestrip3data.facet_colour_vals = 0;
                   }
                }

                w->trianglestrip3data.points = (tel_point)cur_ptr;
                for( j = 0; j < (d->num_facets+2); j++ )
                {
                   w->trianglestrip3data.points[j] = d->vertices[j];
                }
                cur_ptr += ( (d->num_facets+2) * sizeof( TEL_POINT ) );

                if( d->vertex_flag == TEL_VT_NORMAL )
                {
                   if( d->vcolours )
                   {
                      w->trianglestrip3data.vrtflag = TEL_VTFLAG_COLOURNORMAL;
                      w->trianglestrip3data.vnormals = (tel_point)(cur_ptr);
                      for( j = 0; j < (d->num_facets+2); j++ )
                      {
                         w->trianglestrip3data.vnormals[j] = d->vnormals[i];
                      }
                      cur_ptr += ( (d->num_facets+2) * sizeof( TEL_POINT ) );

                      w->trianglestrip3data.colours = (tel_colour)(cur_ptr);

                      for( j = 0; j < (d->num_facets+2); j++ )
                      {
                         w->trianglestrip3data.colours[j] = d->vcolours[i];
                      }
                   }
                   else
                   {
                      w->trianglestrip3data.vrtflag = TEL_VTFLAG_NORMAL;
                      w->trianglestrip3data.colours = 0;
                      w->trianglestrip3data.vnormals = (tel_point)(cur_ptr);

                      for( j = 0; j < (d->num_facets+2); j++ )
                      {
                         w->trianglestrip3data.vnormals[j] = d->vnormals[i];
                      }
                   }
                }
                else
                {
                   w->trianglestrip3data.vnormals = 0;
                   if( d->vcolours )
                   {
                      w->trianglestrip3data.vrtflag = TEL_VTFLAG_COLOUR;
                      w->trianglestrip3data.colours = (tel_colour)(cur_ptr);
                      for( j = 0; j < (d->num_facets+2); j++ )
                      {
                         w->trianglestrip3data.colours[j] = d->vcolours[i];
                      }
                   }
                   else
                   {
                      w->trianglestrip3data.vrtflag = TEL_VTFLAG_NONE;
                      w->trianglestrip3data.colours = 0;
                   }
                }

                status = TSuccess;
            }
            else
                status = TFailure;
            break;
         }
      }
   }
   return status;
}
/*----------------------------------------------------------------------*/

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