void gis_opengl_center_position(GisOpenGL *opengl,
gdouble lat, gdouble lon, gdouble elev);
+void gis_opengl_project(GisOpenGL *opengl,
+ gdouble lat, gdouble lon, gdouble elev,
+ gdouble *px, gdouble *py, gdouble *pz);
+
void gis_opengl_render_tile(GisOpenGL *opengl, GisTile *tile);
void gis_opengl_render_tiles(GisOpenGL *opengl, GisTile *root);