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sources_snake/updateSnake.vhd

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+----------------------------------------------------------------------------------
+-- Company: 
+-- Engineer: 
+-- 
+-- Create Date: 12/15/2021 02:06:27 PM
+-- Design Name: 
+-- Module Name: updateSnake - Behavioral
+-- Project Name: 
+-- Target Devices: 
+-- Tool Versions: 
+-- Description: 
+-- 
+-- Dependencies: 
+-- 
+-- Revision:
+-- Revision 0.01 - File Created
+-- Additional Comments:
+-- 
+----------------------------------------------------------------------------------
+
+
+library IEEE;
+use IEEE.STD_LOGIC_1164.ALL;
+
+library ourTypes;
+use ourTypes.types.all;
+
+-- Uncomment the following library declaration if using
+-- arithmetic functions with Signed or Unsigned values
+use IEEE.NUMERIC_STD.ALL;
+
+-- Uncomment the following library declaration if instantiating
+-- any Xilinx leaf cells in this code.
+--library UNISIM;
+--use UNISIM.VComponents.all;
+
+entity updateSnake is
+    Port ( inSnake : in pos;
+           outSnake : out pos;
+           inIndex : in unsigned(10 downto 0);
+           outIndex : out unsigned(10 downto 0));
+end updateSnake;
+
+architecture Behavioral of updateSnake is
+signal cSnake : pos;
+begin
+process(inSnake)
+variable dir : direction;
+begin
+    case inSnake.dir is
+        when gauche =>
+            cSnake.X <= inSnake.X - 1;
+            cSnake.Y <= inSnake.Y;
+            cSnake.dir <= inSnake.dir;
+            cSnake.isDefined <= inSnake.isDefined;
+        when droite =>
+            cSnake.X <= inSnake.X + 1;
+            cSnake.Y <= inSnake.Y;
+            cSnake.dir <= inSnake.dir;
+            cSnake.isDefined <= inSnake.isDefined;
+        when haut =>
+            cSnake.X <= inSnake.X;
+            cSnake.Y <= inSnake.Y - 1;
+            cSnake.dir <= inSnake.dir;
+            cSnake.isDefined <= inSnake.isDefined;
+        when bas =>
+            cSnake.X <= inSnake.X;
+            cSnake.Y <= inSnake.Y + 1;
+            cSnake.dir <= inSnake.dir;
+            cSnake.isDefined <= inSnake.isDefined;
+    end case;
+end process;
+outSnake <= cSnake;
+outIndex <= inIndex + 1;
+end Behavioral;