DoomRTX/neo/engine/opengl/tess/tessellate.h

typedef struct Vertex {
    double pt[3];
    int index;
    struct Vertex *prev;
} Vertex;

void tessellate
    (double **verts,
     int *nverts,
     int **tris,
     int *ntris,
     const double **contoursbegin, 
     const double **contoursend);