How can I get random numbers between -1024 and 1024 in vhdl

I am really beginner in VHDL and I am trying to make a hot-n-cold game. My first goal is generating numbers between -1024 and 1024 so that I can use 10 switches to guess. However, there are a lot of sources about positive integers but I could not find any for negative ones. Here is a sample code of mine. Also, someone says LFSR does this job but I am new and I could not understand the behavior of LFSR.

library ieee;
use ieee.math_real.all;

entity rand_gen is
end rand_gen;

architecture behavior of rand_gen is 

signal rand_num : integer := 0;

begin

process
    variable seed1, seed2: positive;              
    variable rand: real;   
    variable range_of_rand : real := 1024.0;   
begin
    uniform(seed1, seed2, rand);   
    rand_num <= integer(rand*range_of_rand);  
    wait for 10 ns;
end process;

end behavior;