- if (!child || !child->data)
- has_children = FALSE;
- if (has_children)
- /* Only draw children */
- gis_tile_foreach(tile, child)
- _draw_tiles(self, child);
- else
- /* No children, draw this tile */
- _draw_tile(self, tile);
+ if (child && child->data)
+ has_children = TRUE;
+
+ GList *triangles = NULL;
+ if (has_children) {
+ /* TODO: simplify this */
+ const gdouble rows = G_N_ELEMENTS(tile->children);
+ const gdouble cols = G_N_ELEMENTS(tile->children[0]);
+ const gdouble lat_dist = tile->edge.n - tile->edge.s;
+ const gdouble lon_dist = tile->edge.e - tile->edge.w;
+ const gdouble lat_step = lat_dist / rows;
+ const gdouble lon_step = lon_dist / cols;
+ int row, col;
+ gis_tile_foreach_index(tile, row, col) {
+ GisTile *child = tile->children[row][col];
+ if (child && child->data) {
+ _draw_tiles(opengl, child);
+ } else {
+ const gdouble n = tile->edge.n-(lat_step*(row+0));
+ const gdouble s = tile->edge.n-(lat_step*(row+1));
+ const gdouble e = tile->edge.w+(lon_step*(col+1));
+ const gdouble w = tile->edge.w+(lon_step*(col+0));
+ GList *these = roam_sphere_get_intersect(opengl->sphere, FALSE, n, s, e, w);
+ triangles = g_list_concat(triangles, these);
+ }
+ }
+ } else {
+ triangles = roam_sphere_get_intersect(opengl->sphere, FALSE,
+ tile->edge.n, tile->edge.s, tile->edge.e, tile->edge.w);
+ }
+ if (triangles)
+ _draw_tile(opengl, tile, triangles);