-- Scott Sirowy
-- February 7th, 2007
-- Sample game framework using a BRAM video screen

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;


entity top is
    Port ( 
				clk 	   : 	in 	std_logic;
				reset	   :	in 	std_logic;
				
				hsync    : 	out  	std_logic;		--vga signals
				vsync    : 	out  	std_logic;													
				red_out  : 	out  	std_logic;     --color signals
				grn_out  : 	out  	std_logic;
				blue_out : 	out  	std_logic
			);
end top;

architecture struct of top is

component vga_timings is
	port(
		reset			:	in 	std_logic;
		clock			:	in 	std_logic; -- 50MHz clock assumed
		hsync			:	out 	std_logic;
		vsync			:	out 	std_logic;
		hcount		:	out 	std_logic_vector(9 downto 0);
   	vcount			:	out 	std_logic_vector(8 downto 0)
	);
end component;

component screen is
Port ( 
				clock 	: in  	std_logic;
				reset 	: in  	std_logic;
				address 	: in 		std_logic_vector(11 downto 0);
				data 		: out  	std_logic_vector(3 downto 0)
			  );
end component;

component rgb_read is
    Port ( 
				hcount	: in 		std_logic_vector(9 downto 0);
				vcount	: in 		std_logic_vector(8 downto 0);
				input 	: in  	std_logic_vector(3 downto 0);
				
				ram_addr    : out		std_logic_vector(11 downto 0);
				red 		: out  	std_logic;
				blue 		: out  	std_logic;
				green 	: out  	std_logic
			);
end component;


signal hcount_sig : std_logic_vector(9 downto 0);
signal vcount_sig : std_logic_vector(8 downto 0);
signal video_address : std_logic_vector(11 downto 0);
signal rgb_in : std_logic_vector(3 downto 0);


begin


my_vga:  vga_timings port map( reset => reset,
					 clock => clk,
					 hsync => hsync,
					 vsync => vsync,
					 hcount => hcount_sig,
					 vcount => vcount_sig
				    );

screen_mem:  screen port map(
					clock => clk,
					reset => reset,
					address => video_address,
					data  => rgb_in
				    );

color_mapper:  rgb_read port map(
					 hcount => hcount_sig,
					vcount => vcount_sig,
					input => rgb_in,
					ram_addr => video_address,
					red => red_out,
					blue => blue_out,
					green => grn_out
					);
				

end struct;