Function patch_eval_subdivision

kernels/subdiv/patch_eval_grid.h:209–242

    
    template<typename Tessellator>
      inline void patch_eval_subdivision (const HalfEdge* h, Tessellator tessellator)
    {
      const unsigned N = h->numEdges();
      int neighborSubdiv[GeneralCatmullClarkPatch3fa::SIZE]; // FIXME: use array_t
      float levels[GeneralCatmullClarkPatch3fa::SIZE];
      for (unsigned i=0; i<N; i++) {
        assert(i<GeneralCatmullClarkPatch3fa::SIZE);
        neighborSubdiv[i] = h->hasOpposite() ? h->opposite()->numEdges() != 4 : 0; 
        levels[i] = h->edge_level;
        h = h->next();
      }      
      if (N == 4)
      {
        const Vec2f uv[4] = { Vec2f(0.0f,0.0f), Vec2f(1.0f,0.0f), Vec2f(1.0f,1.0f), Vec2f(0.0f,1.0f) };
        tessellator(uv,neighborSubdiv,levels,0);
      }
      else
      {
        for (unsigned i=0; i<N; i++) 
        {
          assert(i<MAX_PATCH_VALENCE);
          static_assert(MAX_PATCH_VALENCE <= 16, "MAX_PATCH_VALENCE > 16");
          const int h = (i >> 2) & 3, l = i & 3;
          const Vec2f subPatchID((float)l,(float)h);
          const Vec2f uv[4] = { 2.0f*subPatchID + (0.5f+Vec2f(0.0f,0.0f)),
                                2.0f*subPatchID + (0.5f+Vec2f(1.0f,0.0f)),
                                2.0f*subPatchID + (0.5f+Vec2f(1.0f,1.0f)),
                                2.0f*subPatchID + (0.5f+Vec2f(0.0f,1.0f)) };
          const int neighborSubdiv1[4] = { 0,0,0,0 }; 
          const float levels1[4] = { 0.5f*levels[(i+0)%N], 0.5f*levels[(i+0)%N], 0.5f*levels[(i+N-1)%N], 0.5f*levels[(i+N-1)%N] };
          tessellator(uv,neighborSubdiv1,levels1,i);
        }
      }
    }
  }
}