merge #16

1 files changed, 67 insertions, 0 deletions

diff --git a/basys3/basys3.srcs/ppu_comp.vhd b/basys3/basys3.srcs/ppu_comp.vhd
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+----------------------------------------------------------------------------------
+-- Company: 
+-- Engineer: 
+-- 
+-- Create Date: 23.02.2023 10:31:25
+-- Design Name: 
+-- Module Name: ppu_comp - 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;
+use work.ppu_consts.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 ppu_comp is
+ Port ( 
+ 		FG_HIT: in std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
+		BG_EN: out std_logic;
+		FG_EN: out std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0));
+		
+end ppu_comp;
+
+architecture Behavioral of ppu_comp is
+signal FG_HIT_Empty : std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0) := (others => '0');
+begin
+    process (FG_HIT)
+    variable HIT : BOOLEAN := FALSE;
+    begin
+        -- check if fg_hit is not empty
+        if FG_HIT /= FG_HIT_Empty then
+            BG_EN <= '0';
+            FOR I IN 0 TO PPU_FG_SPRITE_COUNT-1 LOOP
+                -- if fg_hit is the first one then enable it
+                IF(FG_HIT(I) = '1' AND HIT = FALSE) THEN
+                    FG_EN(I) <= '1';
+                    HIT := TRUE;
+                ELSE
+                    -- make rest low
+                    FG_EN(I) <= '0';
+                END IF;
+            END LOOP;
+            HIT := FALSE;
+        else
+            BG_EN <= '1';
+            FG_EN <= (others => '0');
+        end if;
+    end process;
+end Behavioral;