create_texcoords(slice.x, slice.x+slice.w, border.left, border.right, texture->get_width(), u);
create_texcoords(slice.y, slice.y+slice.h, border.bottom, border.top, texture->get_height(), v);
create_texcoords(slice.x, slice.x+slice.w, border.left, border.right, texture->get_width(), u);
create_texcoords(slice.y, slice.y+slice.h, border.bottom, border.top, texture->get_height(), v);