wireframe.C

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/**********************************************************************
 * wireframe.C
 **********************************************************************/
#include "std/config.H"
#include "geom/gl_view.H"
#include "mesh/bfilters.H"
#include "wireframe.H"

static bool debug = Config::get_var_bool("DEBUG_WIREFRAME", false);

/**********************************************************************
 * WireframeTexture:
 **********************************************************************/
bool  WireframeTexture::_show_quad_diagonals = false;
COLOR WireframeTexture::_default_line_color = Color::black;

void
WireframeTexture::set_default_line_color(CCOLOR& color) 
{
   _default_line_color = color;
}

int
WireframeTexture::draw(CVIEWptr& v)
{
   if (_ctrl)
      return _ctrl->draw(v);

   // 'a' is opacity (alpha) determined by GL_VIEW::init_line_smooth()
   // needed to simulate line widths below the minimum supported value:
   GLfloat a = 1;
   static bool line_smooth = Config::get_var_bool("ANTIALIAS_WIREFRAME",false);
   if (line_smooth) {
      // set line smoothing, set line width, and push attributes:
      GLfloat w = GLfloat(v->line_scale()*_width);
      GL_VIEW::init_line_smooth(w, GL_CURRENT_BIT);//, &a);
   } else {
      glPushAttrib(GL_CURRENT_BIT | GL_ENABLE_BIT);
      glLineWidth(_width);
   }

   // set state
   GL_COL(_color, a*alpha());   // GL_CURRENT_BIT
   glDisable(GL_LIGHTING);      // GL_ENABLE_BIT

   if (!(_quad_diagonals_in_dl == _show_quad_diagonals &&
         BasicTexture::draw(v))) {

      _quad_diagonals_in_dl = _show_quad_diagonals;

      int dl = _dl.get_dl(v, 1, _patch->stamp());
      if (dl)
         glNewList(dl, GL_COMPILE);

      // Build the edge strip at the current subdivision level
      Bedge_list edges = _patch->cur_edges();
      edges.clear_flags();

      // If secondary edges shouldn't be drawn, set their flags
      // so they won't be drawn:
      if (!BMESH::show_secondary_faces())
         edges.secondary_edges().set_flags(1);

      err_adv(debug, "wireframe: %d edges", edges.num());

      // Construct filter that accepts unreached strong edges of
      // this patch:
      UnreachedSimplexFilter    unreached;
      StrongEdgeFilter          strong;
      PatchEdgeFilter           mine(_patch->cur_patch());
      if (_show_quad_diagonals)
         EdgeStrip(edges, unreached + mine).draw(_cb);
      else
         EdgeStrip(edges, unreached + strong + mine).draw(_cb);

      // end the display list here
      if (_dl.dl(v)) {
         _dl.close_dl(v);

         // the display list is built; now execute it
         BasicTexture::draw(v);
      }
   }

   glPopAttrib();

   return _patch->num_faces();
}
   
/* end of file wireframe.C */

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