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MapMaker.cxx

/*-------------------------------------------------------------------------
  MapMaker.cxx

  Written by Per Liedman, started February 2000.
  Based on a perl-script written by Alexei Novikov (anovikov@heron.itep.ru)

  Copyright (C) 2000 Per Liedman, liedman@home.se

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
---------------------------------------------------------------------------*/

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <zlib.h>
#ifndef _MSC_VER
#  include <unistd.h>
#endif
#include <sys/stat.h>
#include <plib/ul.h>

#include "MapMaker.hxx"
/*#include <simgear/magvar/magvar.hxx>*/

// Utility function that I needed to put somewhere - this probably isn't the best place for it.
// Appends a path separator to a directory path if not present.
// Calling function MUST ENSURE that there is space allocated for the potential strcat.
void NormalisePath(char* dpath) {
  size_t dlen = strlen(dpath);
  #if defined( macintosh )
  if(dpath[dlen-1] != ':') {
    dpath[dlen] = ':';
    dpath[dlen+1] = '\0';
  }
  #elseif (defined(WIN32) && !defined(__CYGWIN__))
  if(dpath[dlen-1] != '\\' && dpath[dlen-1] != '/') {
    dpath[dlen] = '\\';
    dpath[dlen+1] = '\0';
  }
  #else
  if(dpath[dlen-1] != '/') {
    //strcat(dpath, '/');
    dpath[dlen] = '/';
    dpath[dlen+1] = '\0';
  }
  #endif
}

const float MapMaker::simple_normals[][3] = {{0.0f, 0.0f, 1.0f},
                                   {0.0f, 0.0f, 1.0f},
                                   {0.0f, 0.0f, 1.0f},
                                   {0.0f, 0.0f, 1.0f}};

MapMaker::MapMaker( char *fg_root, char *ap_filter, int features,
                    int size, int scale ) {
  this->fg_root = NULL;
  setFGRoot(fg_root);
  arp_filter = ap_filter;
  this->features = features;
  this->size = size;
  this->device_size = size;
  scle = scale;

  modified = false;
  palette_loaded = false;

  setLight( -1, -1, 2 );       // default lighting

  // setup indices for the elevation levels colours
  // (these might be overridden by read_materials)
  for (int i = 0; i < MAX_ELEV_LEVELS; i++) {
    elev_colindex[i] = 1+i;
  }

  number_elev_levels = 1;
  elev_height[0] = -1;
}

MapMaker::~MapMaker() {
  for (unsigned int i = 0; i < palette.size(); i++) {
    delete[] palette[i];
  }

  delete[] fg_root;
}

void MapMaker::setFGRoot( char *fg_root ) {
  delete this->fg_root;
  if (fg_root == NULL) {
    fg_root = getenv("FG_ROOT");
    if (fg_root == NULL) {
      fg_root = FGBASE_DIR;
    }
  }
   
  this->fg_root = new char[strlen(fg_root)+1];
  strcpy(this->fg_root, fg_root);
}

void MapMaker::setPalette( char* filename ) {
  if (palette_loaded) {
    for (unsigned int i = 0; i < palette.size(); i++) {
      delete palette[i];
    }
  }

  palette_loaded = false;

  read_materials(filename);
}

int MapMaker::createMap(GfxOutput *output,float theta, float alpha, 
                        string dirpath, float autoscale) {
  this->output = output;
  
  modified = false;

  if (!palette_loaded)
    read_materials();

  if (!palette_loaded) {
    fprintf(stderr, "No palette loaded.\n");
    return 0;
  }

  int nb_frag = size / device_size;
  if ( nb_frag * device_size < size )
    nb_frag += 1;
  nb_frag *= nb_frag;
  if ( nb_frag > 1 ) {
    printf("________________________________\r"); fflush( stdout );
  }

  int i = 0, j = 0;
  for (int x = 0; x < size; x += device_size) {
    for (int y = 0; y < size; y += device_size) {
      output->openFragment(x,y,device_size);
      output->clear( palette[0] );

      // set up coordinate space
      sgVec3 xyz;
      float r_e;
      xyz_lat( theta, alpha, xyz, &r_e );
      sgMat4 rotation_matrix;
      sgMakeRotMat4(rotation_matrix, 
                    alpha * SG_RADIANS_TO_DEGREES,
                    0.0f,
                    90.0f - theta * SG_RADIANS_TO_DEGREES);
      sgCopyVec3(light_vector, map_light);
      sgXformVec3(light_vector, rotation_matrix);
      output->setLightVector( light_vector );
      
      // Draw a quad spanning the full area and the same as the clear color
      // to avoid corruption from the pixel read not reading areas we don't
      // explicitly draw to on some platforms.
      bool save_shade = output->getShade();
      output->setShade(false);
      output->setColor(palette[12]);
      sgVec2 baseQuad[4];
      sgSetVec2(baseQuad[0], 0.0, 0.0);
      sgSetVec2(baseQuad[1], 0.0, (float)size);
      sgSetVec2(baseQuad[2], (float)size, (float)size);
      sgSetVec2(baseQuad[3], (float)size, 0.0);
      output->drawQuad(&baseQuad[0], simple_normals);
      output->setShade(save_shade);

      // calculate which tiles we will have to load
      float dtheta, dalpha;

      if (autoscale > 0.0f) {
        // I think this is wrong (PL 010719):
        // set scale to autoscale degrees in meters at this latitude
        //scle = (int)(earth_radius_lat(theta)*2.0f * autoscale *SG_PI / 360.0f);

        // this should be better:
        scle = (int)(rec*2.0f * autoscale *SG_PI / 360.0f);

        // no idea why this magic should be here:
        //dtheta = autoscale * 0.8f * SG_DEGREES_TO_RADIANS;
        //dalpha = (autoscale * 0.8f + fabs(tan(theta)) * 0.35f) * SG_DEGREES_TO_RADIANS;
      } //else {
        lat_ab( scle/2, scle/2, theta, alpha, &dtheta, &dalpha );
        dtheta -= theta;
        dalpha -= alpha;
        //  }

//    int sgntheta = (theta < 0.0f) ? 1 : 0, sgnalpha = (alpha < 0.0f) ? 1 : 0;
//    // Rainer Emrich's improved code for finding map boundaries
//    int mid_theta = (int)( theta * SG_RADIANS_TO_DEGREES + 0.0001) - sgntheta;
//    int mid_alpha = (int)( alpha * SG_RADIANS_TO_DEGREES + 0.0001) - sgnalpha;
//    int int_dtheta = (int)( dtheta * SG_RADIANS_TO_DEGREES + 0.6f);
//    int int_dalpha = (int)( dalpha * SG_RADIANS_TO_DEGREES + 0.6f);
//    int max_theta = mid_theta + int_dtheta;
//    int min_theta = mid_theta - int_dtheta;
//    int max_alpha = mid_alpha + int_dalpha;
//    int min_alpha = mid_alpha - int_dalpha;
      int max_theta = (int)floor((theta + dtheta) * SG_RADIANS_TO_DEGREES);
      int min_theta = (int)floor((theta - dtheta) * SG_RADIANS_TO_DEGREES);
      int max_alpha = (int)floor((alpha + dalpha) * SG_RADIANS_TO_DEGREES);
      int min_alpha = (int)floor((alpha - dalpha) * SG_RADIANS_TO_DEGREES);
      if( max_theta > 90 ) max_alpha=90;
      if( min_theta < -90 ) min_alpha=-90;
      if( max_alpha > 360 ) max_alpha=360;
      if( min_alpha < -360 ) min_alpha=-360;
      
      zoom = (float)size / (float)scle;

      // UG! - process_directory modifies the passed char* and wants the result next time
      char *subdir = new char[strlen(fg_root) + 512];  // 512 should be *very* safe (too safe?)
      strcpy(subdir, dirpath.c_str());
      size_t slen = strlen(subdir);
      // Now we need to make sure that the supplied directory ends in a path separator.
      NormalisePath(subdir);
      
      slen = strlen(subdir);  // Need to update it since process_directory relys on it.
      
      //if (getVerbose())
        //printf("Map area: lat %c%d / %c%d, lon %c%d / %c%d.\n", 
        //   ns(min_theta), abs(min_theta), ns(max_theta), abs(max_theta), 
        //   ew(min_alpha), abs(min_alpha), ew(max_alpha), abs(max_alpha) );
     
      for (int k = min_theta; k <= max_theta; k++) {
        for (int l = min_alpha; l <= max_alpha; l++) {
          if (l > 179) {
            process_directory( subdir, slen, k, l - 360, xyz );
          } else if (l < -180) {
            process_directory( subdir, slen, k, l + 360, xyz );
          } else {
            process_directory( subdir, slen, k, l, xyz );
          }
        }
      }

      delete[] subdir;

      if (modified) {
        Overlays overlays( fg_root, zoom, size );
        overlays.setOutput( output );
        overlays.setAirportColor( palette[materials["RunwayOutline"]],
                                  palette[materials["RunwayFill"]] );
        overlays.setNavaidColor( palette[materials["NavaidLabels"]] );
        overlays.setVorToColor( palette[materials["VorToLine"]] );
        overlays.setVorFromColor( palette[materials["VorFromLine"]] );
        overlays.setIlsColor( palette[materials["IlsLoc"]] );
        overlays.setLocation( theta, alpha );

        int features = Overlays::OVERLAY_NAMES | Overlays::OVERLAY_IDS;
        if (getAirports()) features += Overlays::OVERLAY_AIRPORTS;
        if (getNavaids()) {
          features += Overlays::OVERLAY_NAVAIDS;
          if (getNavaidsVOR()) features += Overlays::OVERLAY_NAVAIDS_VOR;
          if (getNavaidsNDB()) features += Overlays::OVERLAY_NAVAIDS_NDB;
          if (getNavaidsFIX()) features += Overlays::OVERLAY_NAVAIDS_FIX;
          if (getNavaidsILS()) features += Overlays::OVERLAY_NAVAIDS_ILS;
        }
        overlays.setFeatures(features);

        overlays.drawOverlays();
      } else if (getVerbose()) {
        printf("Nothing to draw - no output written.\n");
      }

      output->closeFragment();
      ++i;
      if ( nb_frag > 32 ) {
        if ( i > nb_frag ) {
          printf("."); fflush( stdout );
          i -= nb_frag;
        }
      } else if ( nb_frag > 1 ) {
        while ( j < i * 32 / nb_frag ) {
          printf(".");
          j++;
        }
      fflush( stdout );
      }
    }
  }
  printf("\r");
  return 1;
}

void MapMaker::sub_trifan( const int_list &indices, vector<float*> &v, 
                     vector<float*> &n ) {
  int_list::const_iterator index = indices.begin();
  int cvert = *(index++);      // index of central vertex
  int vert2 = *(index++);      // the first vertex of the circumference

  sgVec3 t[3], nrm[3];
  float length2 = 0.6f * scle;

  // get the two first vertices
  sgCopyVec3( t[0], v[cvert]);
  sgCopyVec3( t[1], v[vert2]);
  sgCopyVec3( nrm[0], n[cvert]);
  sgCopyVec3( nrm[1], n[vert2]);

  // now loop over each triangle in the fan
  while ( index != indices.end() ) {
    vert2 = *(index++);

    // get third vertex
    sgCopyVec3( t[2], v[vert2] );
    sgCopyVec3( nrm[2], n[vert2] );
    
    // check whether this triangle is visible (?)
    if (fabs(t[0][0]) < length2 || fabs(t[0][1]) < length2 ||
         fabs(t[1][0]) < length2 || fabs(t[1][1]) < length2 ||
         fabs(t[2][0]) < length2 || fabs(t[2][1]) < length2) {
      
      int ctimes = 0, max_ctimes = 0;
      int times[3], order[3], oind[3];
      float levels[MAX_ELEV_LEVELS][4];
      sgVec3 normal[MAX_ELEV_LEVELS][2];

      for (int k = 0; k < number_elev_levels; k++) { 
         levels[k][0] = 0.0f; levels[k][1] = 0.0f; 
         levels[k][2] = 0.0f; levels[k][3] = 0.0f;
      }
      
      // check for each line how many elevation levels it passes
      for (int j = 0; j < 3; j++) {
         int next = (j+1) % 3;
         
         ctimes = abs( elev2colour((int)t[j][2]) - 
                      elev2colour((int)t[next][2]) );
         times[j] = ctimes;

         if (ctimes > 0) {
          float lx, ly;
          int lh;
          sgVec3 dummy_normal;
          level_triangle( (float*)&t[j], (float*)&t[next], nrm[j], nrm[next], 
                          ctimes, &lx, &ly, dummy_normal, &lh );

          order[j] = elev_height[lh];
          if (ctimes > max_ctimes) max_ctimes = ctimes;
         } else
          order[j] = 0;

         oind[j] = j;
      }

      // if some line stretches across more than one elevation level
      if (max_ctimes > 0) {      // we have to subdivide
         for (int j = 0; j < 3; j++) {
          /* pick the index of the greatest value of order 
             (that has not already been used) */
          int k;
          for (k = j+1; k < 3; k++) {
            if (order[k] > order[j]) {
              int tmp = order[j]; order[j] = order[k]; order[k] = tmp;
              tmp = oind[j]; oind[j] = oind[k]; oind[k] = tmp;
            }
          }

          int idx = oind[j];      /* idx is the index of the vertex 
                                     with highest elevation */
          int next = (idx + 1) % 3;

          // split this line times[idx] times 
          for (k = times[idx]; k > 0; k--) {
            float lx, ly;
            int lh;
            sgVec3 lnormal;
            level_triangle( (float*)&t[idx], (float*)&t[next], 
                            nrm[idx], nrm[next], k, &lx, &ly, lnormal, &lh );
            int pmin = (t[idx][2] < t[next][2]) ? idx : next;
            
            if (levels[lh][2] != 0.0f) {
              // this line can now be transformed into a polygon
              int ecol = lh + 1;

              sgVec2 quadverts[4];
              sgVec3 quadnorms[4];
              sgSetVec2( quadverts[0], 
                         scale(levels[lh][2], size, zoom), 
                         scale(levels[lh][3], size, zoom) );
              sgSetVec2( quadverts[1], 
                         scale(levels[lh][0], size, zoom), 
                         scale(levels[lh][1], size, zoom) );
              sgSetVec2( quadverts[2],
                         scale(lx, size, zoom), scale(ly, size, zoom) );
              sgSetVec2( quadverts[3],
                         scale(t[pmin][0], size, zoom), 
                         scale(t[pmin][1], size, zoom) );
              sgCopyVec3(quadnorms[0], normal[lh][1]);
              sgCopyVec3(quadnorms[1], normal[lh][0]);
              sgCopyVec3(quadnorms[2], lnormal);
              sgCopyVec3(quadnorms[3], nrm[pmin]);

              output->setColor(palette[ecol]);
              output->drawQuad(quadverts, quadnorms);
            } else {
              levels[lh][0] = lx;
              levels[lh][1] = ly;
              levels[lh][2] = t[pmin][0];
              levels[lh][3] = t[pmin][1];
              sgCopyVec3(normal[lh][0], lnormal);
              sgCopyVec3(normal[lh][1], nrm[pmin]);
            }
          }
         } 
      }
    }

    sgCopyVec3( t[1], t[2] );
    sgCopyVec3( nrm[1], nrm[2] );
  }
}

void MapMaker::draw_tri( const int_list &indices, vector<float*> &v,
                         vector<float*> &n, int col) {
  int_list::const_iterator index = indices.begin();
  unsigned int pos = 0;
  // Some btg airport files economize on normals. 
  bool single_normal = false;
  if(n.size() < v.size()) single_normal = true;
  
  while(indices.size() - pos >= 3) {
    int vert0 = *(index++), vert1 = *(index++), vert2 = *(index++);
    // TODO - should add some checking that the returned values of
    // vert0 -> 2 are not greater than the node array size.
    
    sgVec3 t[3], nrm[3];
    sgVec2 p[3];
    sgVec4 color[3];
    
    sgCopyVec3( t[0], v[vert0] );
    sgCopyVec3( t[1], v[vert1] );
    sgCopyVec3( t[2], v[vert2] );
    sgCopyVec3( nrm[0], (single_normal ? *(n.begin()) : n[vert0]) );
    sgCopyVec3( nrm[1], (single_normal ? *(n.begin()) : n[vert1]) );
    sgCopyVec3( nrm[2], (single_normal ? *(n.begin()) : n[vert2]) );
    sgSetVec2( p[0], scale(t[0][0], size, zoom), scale(t[0][1], size, zoom) );
    sgSetVec2( p[1], scale(t[1][0], size, zoom), scale(t[1][1], size, zoom) );
    sgSetVec2( p[2], scale(t[2][0], size, zoom), scale(t[2][1], size, zoom) );
    
    bool smooth=false;
    bool save_shade = output->getShade();
    
    if (col == 12 || col == 13) {
      // do not shade ocean/lake/etc.
      output->setColor(palette[col]);
      // DCL - and switch lighting off for water for now (see the Jan 2005 mailing list archives)
      output->setShade(false);
    } else {
      int dcol;
      if (col>=0) {
         dcol = col;
      } else {
      dcol = elev2colour((int)((t[0][2] + t[1][2] + t[2][2]) / 3.0f));
      if(features & DO_SMOOTH_COLOR) {
        elev2colour_smooth((int)t[0][2], color[0]);
        elev2colour_smooth((int)t[1][2], color[1]);
        elev2colour_smooth((int)t[2][2], color[2]);
        smooth=true;
        }
      }
      output->setColor(palette[dcol]);
    }
    
    if(smooth) {
      output->drawTriangle( p, nrm, color );
    } else {
      output->drawTriangle( p, nrm );
    }
    
    // DCL - restore the original lighting in case we turned it off for water
    output->setShade(save_shade);
    
    pos += 3;
  }
}

void MapMaker::draw_trifan( const int_list &indices, vector<float*> &v, 
                            vector<float*> &n, int col ) {
  // Some btg airport files economize on normals. 
  bool single_normal = false;
  if(n.size() < v.size()) single_normal = true;
  
  int_list::const_iterator index = indices.begin();
  int cvert = *(index++), vert2 = *(index++);

  sgVec3 t[3], nrm[3];
  sgVec2 p[3];
  sgVec4 color[3];

  sgCopyVec3( t[0], v[cvert] );
  sgCopyVec3( t[1], v[vert2] );
  sgCopyVec3( nrm[0], (single_normal ? *(n.begin()) : n[cvert]) );
  sgCopyVec3( nrm[1], (single_normal ? *(n.begin()) : n[vert2]) );
  sgSetVec2( p[0], scale(t[0][0], size, zoom), scale(t[0][1], size, zoom) );
  sgSetVec2( p[1], scale(t[1][0], size, zoom), scale(t[1][1], size, zoom) );

  while ( index != indices.end() ) {
    bool smooth=false;
    bool save_shade = output->getShade();
    vert2 = *(index++);

    sgCopyVec3( t[2], v[vert2] );
    sgCopyVec3( nrm[2], (single_normal ? *(n.begin()) : n[vert2]) );
    sgSetVec2( p[2], scale(t[2][0], size, zoom), scale(t[2][1], size, zoom) );

    if (col == 12 || col == 13) {
      // do not shade ocean/lake/etc.
      output->setColor(palette[col]);
      // DCL - and switch lighting off for water for now (see the Jan 2005 mailing list archives)
      output->setShade(false);
    } else {
      int dcol;
      if (col>=0) {
         dcol = col;
      } else {
      dcol = elev2colour((int)((t[0][2] + t[1][2] + t[2][2]) / 3.0f));
      if(features & DO_SMOOTH_COLOR) {
        elev2colour_smooth((int)t[0][2], color[0]);
        elev2colour_smooth((int)t[1][2], color[1]);
        elev2colour_smooth((int)t[2][2], color[2]);
        smooth=true;
        }
      }
      output->setColor(palette[dcol]);
    }

    if(smooth)
      output->drawTriangle( p, nrm, color );
    else
      output->drawTriangle( p, nrm );

    sgCopyVec2( p[1], p[2] );
    sgCopyVec3( t[1], t[2] );
    sgCopyVec3( nrm[1], nrm[2] );
    
    // DCL - restore the original lighting in case we turned it off for water
    output->setShade(save_shade);
  }

  if (col < 0 && !(features & DO_SMOOTH_COLOR)) {
    sub_trifan( indices, v, n );
  }
}
                      
void MapMaker::draw_tristrip( const int_list &indices, vector<float*> &v, 
                            vector<float*> &n, int col ) {
  // Some btg airport files economize on normals. 
  bool single_normal = false;
  if(n.size() < v.size()) single_normal = true;
  
  int_list::const_iterator index = indices.begin();
  int vert0 = *(index++), vert1 = *(index++), vert2;

  sgVec3 t[3], nrm[3];
  sgVec2 p[3];
  sgVec4 color[3];

  sgCopyVec3( t[0], v[vert0] );
  sgCopyVec3( t[1], v[vert1] );
  sgCopyVec3( nrm[0], (single_normal ? *(n.begin()) : n[vert0]) );
  sgCopyVec3( nrm[1], (single_normal ? *(n.begin()) : n[vert1]) );
  sgSetVec2( p[0], scale(t[0][0], size, zoom), scale(t[0][1], size, zoom) );
  sgSetVec2( p[1], scale(t[1][0], size, zoom), scale(t[1][1], size, zoom) );

  while ( index != indices.end() ) {
    bool smooth=false;
    bool save_shade = output->getShade();
    vert2 = *(index++);

    sgCopyVec3( t[2], v[vert2] );
    sgCopyVec3( nrm[2], (single_normal ? *(n.begin()) : n[vert2]) );
    sgSetVec2( p[2], scale(t[2][0], size, zoom), scale(t[2][1], size, zoom) );

    if (col == 12 || col == 13) {
      // do not shade ocean/lake/etc.
      output->setColor(palette[col]);
      // DCL - and switch lighting off for water for now (see the Jan 2005 mailing list archives)
      output->setShade(false);
    } else {
      int dcol;
      if (col>=0) {
         dcol = col;
      } else {
      dcol = elev2colour((int)((t[0][2] + t[1][2] + t[2][2]) / 3.0f));
      if(features & DO_SMOOTH_COLOR) {
        elev2colour_smooth((int)t[0][2], color[0]);
        elev2colour_smooth((int)t[1][2], color[1]);
        elev2colour_smooth((int)t[2][2], color[2]);
        smooth=true;
        }
      }
      output->setColor(palette[dcol]);
    }

    if(smooth)
      output->drawTriangle( p, nrm, color );
    else
      output->drawTriangle( p, nrm );

    // This scheme specifies triangles alternately clockwise and anti-clockwise.
    // Is this OK in openGL?
    sgCopyVec2( p[1], p[0] );
    sgCopyVec3( t[1], t[0] );
    sgCopyVec3( nrm[1], nrm[0] );
    sgCopyVec2( p[0], p[2] );
    sgCopyVec3( t[0], t[2] );
    sgCopyVec3( nrm[0], nrm[2] );
    
    // DCL - restore the original lighting in case we turned it off for water
    output->setShade(save_shade);
  }

  // DCL - I don't know what sub_trifan is meant to do, so haven't written a sub_tristrip
  /*
  if (col < 0 && !(features & DO_SMOOTH_COLOR)) {
    sub_trifan( indices, v, n );
  }
  */
}

int MapMaker::process_binary_file( char *tile_name, sgVec3 xyz ) {
  //cout << "tile name = " << tile_name << '\n';
  
  //float cr;               // reference point (gbs)
  sgVec3 gbs, tmp;
  //int scount = 0;
  int material = 16;
  unsigned int i;
  SGBinObject tile;

  vector<float*> v, n;
  int verts = 0, normals = 0;

  if ( !tile.read_bin( tile_name ) ) {
    return 0;
  }

  modified = true;

  /* ugly conversion of GBS as Point3D to sgVec3 (why doesn't SimGear use
     SG from PLIB?) */
  Point3D gbs_p = tile.get_gbs_center();
  for (i = 0; i < 3; i++) {
    gbs[i] = gbs_p[i];
  }

  /* convert point_list of wgs84 nodes to a list of points transformed
     into the maps local coordinate system */
  const point_list wgs84_nodes = tile.get_wgs84_nodes();
  for ( point_list::const_iterator node = wgs84_nodes . begin(); 
      node != wgs84_nodes . end();
      node++ ) {

    float *nv = new sgVec3;
    for (i = 0; i < 3; i++) {
      tmp[i] = (*node)[i];
    }
    
    sgAddVec3(tmp, gbs);
    double pr = sgLengthVec3( tmp );
    ab_xy( tmp, xyz, nv );
    // nv[2] contains the sea-level z-coordinate - calculate this vertex'
    // altitude:
    nv[2] = pr - nv[2];
    v.push_back( nv );
    verts++;
  }

  // same as above for normals
  const point_list m_norms = tile.get_normals();
  for ( point_list::const_iterator normal = m_norms.begin(); 
      normal != m_norms.end();
      normal++ ) {
    // Make a new normal
    float *nn = new sgVec3;
    
    for (i = 0; i < 3; i++) {
      nn[i] = (*normal)[i];
    }
    
    n.push_back( nn );
    normals++;
  }

  const group_list tris = tile.get_tris_v();
  string_list tri_mats = tile.get_tri_materials();
  const group_list fans = tile.get_fans_v();
  string_list fan_mats = tile.get_fan_materials();
  const group_list strips = tile.get_strips_v();
  string_list strip_mats = tile.get_strip_materials();
  
  // tris
  i = 0;
  for ( group_list::const_iterator tri = tris.begin(); 
      tri != tris.end(); 
      tri++) {

    StrMap::const_iterator mat_it = materials.find( tri_mats[i] );
    if ( mat_it == materials.end() ) {
      if (getVerbose()) {
      fprintf( stderr, "Warning: unknown material \"%s\" encountered.\n", 
             tri_mats[i].c_str() );
      }
      material = -1;
    } else {
      material = (*mat_it).second;
    }

    draw_tri( *tri, v, n, material );
    i++;
  }

  // fans
  i = 0;
  for ( group_list::const_iterator fan = fans.begin(); 
      fan != fans.end(); 
      fan++) {

    StrMap::const_iterator mat_it = materials.find( fan_mats[i] );
    if ( mat_it == materials.end() ) {
      if (getVerbose()) {
      fprintf( stderr, "Warning: unknown material \"%s\" encountered.\n", 
             fan_mats[i].c_str() );
      }
      material = -1;
    } else {
      material = (*mat_it).second;
    }

    draw_trifan( *fan, v, n, material );
    i++;
  }
      
  // strips
  i = 0;
  for ( group_list::const_iterator strip = strips.begin(); 
      strip != strips.end(); 
      strip++) {

    StrMap::const_iterator mat_it = materials.find( strip_mats[i] );
    if ( mat_it == materials.end() ) {
      if (getVerbose()) {
      fprintf( stderr, "Warning: unknown material \"%s\" encountered.\n", 
             strip_mats[i].c_str() );
      }
      material = -1;
    } else {
      material = (*mat_it).second;
    }

    draw_tristrip( *strip, v, n, material );
    i++;
  }
      
  if(0) {
    cout << "Node_list sizes are nodes: " << wgs84_nodes.size() << " -- normals: " << m_norms.size() << '\n'; 
    cout << "Group_list sizes are tris: " << tris.size() << " -- fans: " << fans.size() << " -- strips: " << strips.size() << '\n';
  } 

  for (i = 0; i < v.size(); i++) {
    delete[] v[i];
  }
  for (i = 0; i < n.size(); i++) {
    delete[] n[i];
  }
  
  return 1;
}

int MapMaker::process_ascii_file( char *tile_name, sgVec3 xyz ) {
  //float cr;               // reference point (gbs)
  sgVec3 gbs, tmp;
  //int scount = 0;
  int i1, i2, material = 16;
  int verts = 0, normals = 0;
  vector<float*> v;                   // vertices
  vector<float*> n;                   // normals

  char lbuffer[4096];       /* will there be longer lines in
                                         scenery files? */
  char *token, delimiters[] = " \t\n";

  // setup some reasonable sizes for vectors
  v.reserve(1024);
  n.reserve(1024);

  gzFile tf = gzopen( tile_name, "rb" );

  if (tf == NULL) {
    return 0;
  }

  // read the first line
  gzgets( tf, lbuffer, 4096 );
  if ( strncmp(lbuffer, "# FGFS Scenery", 14) != 0 ) {
    gzclose(tf);
    return 0;
  }

  modified = true;

  while ( (gzgets(tf, lbuffer, 4096) != Z_NULL) ) {
    switch (lbuffer[0]) {
    case '#': {
      token = strtok(lbuffer+1, delimiters);

      if ( strcmp(token, "gbs") == 0 ) {
         for (int i = 0; i < 3; i++) {
          token = strtok(NULL, delimiters);
          gbs[i] = atof(token);
         }
      } else if ( strcmp(token, "usemtl") == 0 ) {
         token = strtok(NULL, delimiters);
         StrMap::iterator mat_it = materials.find(token);
         
         if (mat_it == materials.end()) {
          material = -1;  // unknown material
         } else {
          material = (*mat_it).second;
         }
      }
    }
    break;

    case 'v': {
      if (lbuffer[1] == 'n') {
         // Make a new normal
         float *nn = new sgVec3;

         token = strtok(lbuffer+2, delimiters);
         for (int i = 0; i < 3; i++) {
          nn[i] = atof(token);
          token = strtok(NULL, delimiters);
         }

         n.push_back( nn );
         normals++;
      } else if (lbuffer[1] == ' ') {
         float *nv = new sgVec3;
         token = strtok(lbuffer+2, delimiters);
         for (int i = 0; i < 3; i++) {
          tmp[i] = atof(token);
          token = strtok(NULL, delimiters);
         }

         sgAddVec3(tmp, gbs);
         double pr = sgLengthVec3( tmp );
         ab_xy( tmp, xyz, nv );
         // nv[2] contains the sea-level z-coordinate - calculate this vertex'
         // altitude:
         nv[2] = pr - nv[2];
         v.push_back( nv );
         verts++;
      }
    }
    break;

    case 't': {
      if (strncmp(lbuffer, "tf ", 3) == 0) {
         // Triangle fan
         int_list vertex_indices;

         token = strtok(lbuffer+2, " /");
         while ( token != NULL ) {
          i1 = atoi(token);
          token = strtok(NULL, delimiters);
          i2 = atoi(token);

          if (i1 >= verts || i1 >= normals) {
            fprintf(stderr, "Tile \"%s\" contains triangle indices out of " \
                    "bounds.\n", tile_name);
            vertex_indices.clear();
            break;
          }
          
          vertex_indices.push_back( i1 );
          token = strtok(NULL, " /");
         }
         
         if ( !vertex_indices.empty() ) {
          draw_trifan( vertex_indices, v, n, material );
          polys++;
         }
      }
    }
    break;

    case 'f': {
      if (strncmp(lbuffer, "f ", 2) == 0) {
         // Triangle
         int_list vertex_indices;

         token = strtok(lbuffer+2, " /");
         while ( token != NULL ) {
          i1 = atoi(token);
          token = strtok(NULL, delimiters);
          i2 = atoi(token);

          if (i1 >= verts || i1 >= normals) {
            fprintf(stderr, "Tile \"%s\" contains triangle indices out of " \
                    "bounds.\n", tile_name);
            vertex_indices.clear();
            break;
          }
          
          vertex_indices.push_back( i1 );
          token = strtok(NULL, " /");
         }
         
         if ( !vertex_indices.empty() ) {
          draw_trifan( vertex_indices, v, n, material );
          polys++;
         }
      }
    }
    break;

    }    
  }

  gzclose( tf );

  unsigned int i;
  for (i = 0; i < v.size(); i++) {
    delete v[i];
  }
  for (i = 0; i < n.size(); i++) {
    delete n[i];
  }

  return 1;
}


// path must be to the base of the 10x10/1x1 tile tree - more will be appended.
// plen is path length
int MapMaker::process_directory( char *path, size_t plen, int lat, int lon, 
                                 sgVec3 xyz ) {
  int sgnk = (lat < 0) ? 1 : 0, sgnl = (lon < 0) ? 1 : 0;
  
  //printf("process_directory: path = %s, lat = %i, lon = %i\n", path, lat, lon);

  int llen = sprintf( path + plen, "%c%03d%c%02d/%c%03d%c%02d", 
                      ew(lon), abs((lon+sgnl) / 10 * 10) + sgnl*10, 
                      ns(lat), abs((lat+sgnk) / 10 * 10) + sgnk*10,
                      ew(lon), abs(lon), ns(lat), abs(lat) );

  ulDir *dir;
  ulDirEnt *ent;

  if (getVerbose()) 
    printf("%s:  ", path + plen);

  if ((dir = ulOpenDir(path)) == NULL) {
    if (getVerbose()) printf("\n");
    return 0;
  }

  path[plen + llen] = '/';  
  while ((ent = ulReadDir(dir)) != NULL) {
    strcpy( path + plen + llen + 1, ent -> d_name );

    /* we now have to check if this is a regular file -- I suspect this isn't
       portable to non-UNIX systems... */
    struct stat stat_buf;
    stat( path, &stat_buf );
    if ( !(stat_buf.st_mode & S_IFREG) )
      continue;  

    if (getVerbose()) {
      putc( '.', stdout );
      fflush(stdout);
    }

    /* first try to load the tile as a binary file -- if this fails, we
       try it as an ascii file */
    if ( !process_binary_file( path, xyz ) ) {
      if ( !process_ascii_file( path, xyz ) ) {
      if ( getVerbose() )
        fprintf( stderr, "Tile \"%s\" is of unknown format.\n", path );
      }
    }
  }

  if (getVerbose()) putc('\n', stdout);
  ulCloseDir(dir);

  return 1;
}

void MapMaker::read_materials(char *fname /* = NULL */) {
  char *filename;
  if (fname == NULL) {
    char* fgroot = getFGRoot();
    filename = new char[strlen(fgroot) + 32];
    strcpy(filename, fgroot);
    strcat(filename, "/AtlasPalette");
  } else {
    filename = fname;
  }

  FILE *fd = fopen(filename, "r");
  if (fd == NULL) {
    fprintf(stderr, "Could not read palette from file \"%s\".\n", filename);
    return;
  }

  string material;
  char line[256], *token, delimiters[] = " \t";
  unsigned int index;
  int elev_level = 0;
  float* colour;
  sgVec4 black = { 0.0f, 0.0f, 0.0f, 0.0f };
  fgets(line, 256, fd);

  // we might as well reserve space for 32 colours from start
  palette.reserve(32);

  while ( !feof(fd) ) {
    switch (line[0]) {
    case '#':       // comment, ignore
      break;
    case 'C':
    case 'c':
      token = strtok(line, delimiters); // "Colour"
      token = strtok(NULL, delimiters); // index
      index = atoi(token);

      colour = new sgVec4;
      for (int i = 0; i < 4; i++) {
         token = strtok(NULL, delimiters);
         colour[i] = atof(token);
      }

      // make sure we have at least index entries in the palette
      while (palette.size() < index)
         palette.push_back(black);

      if ( index < palette.size() ) {
         palette[index] = colour;
      } else {
         palette.push_back(colour);
      }

      break;

    case 'M':
    case 'm':
      token = strtok(line, delimiters); // "Material"

      token = strtok(NULL, delimiters); // material name
      material = token;

      token = strtok(NULL, delimiters); // index
      index = atoi(token);

      materials[material] = index;

      int height;
      if ( sscanf(material.c_str(), "Elevation_%d", &height) == 1 ) {
         if (elev_level >= MAX_ELEV_LEVELS) {
          fprintf(stderr, "Only %d elevation levels allowed.\n", 
                  MAX_ELEV_LEVELS);
         } else {
          elev_height  [elev_level] = height;
          elev_colindex[elev_level] = index;
          elev_level++;
          if (elev_level > number_elev_levels) number_elev_levels++;
         }
      }

      break;

    case '\n':
    case '\r':
      // Blank line - ignore
      break;
      
    default:
      fprintf(stderr, 
              "Syntax error in file \"%s\". Line:\n\t%s\n", filename, line);
      break;
    }

    fgets(line, 256, fd);
  }

  fclose(fd);

  if (fname == NULL)
    delete[] filename;

  palette_loaded = true;
}

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