diff options
Diffstat (limited to 'basys3/basys3.srcs/ppu_sprite_transform.vhd')
| -rw-r--r-- | basys3/basys3.srcs/ppu_sprite_transform.vhd | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/basys3/basys3.srcs/ppu_sprite_transform.vhd b/basys3/basys3.srcs/ppu_sprite_transform.vhd new file mode 100644 index 0000000..d1b1a23 --- /dev/null +++ b/basys3/basys3.srcs/ppu_sprite_transform.vhd @@ -0,0 +1,24 @@ +library ieee; +library work; +use ieee.std_logic_1164.all; +use ieee.numeric_std.all; +use work.ppu_consts.all; + +entity ppu_sprite_transform is port( -- flip sprites + XI : in std_logic_vector(PPU_SPRITE_POS_H_WIDTH-1 downto 0); -- pixel position relative to tile + YI : in std_logic_vector(PPU_SPRITE_POS_V_WIDTH-1 downto 0); -- pixel position relative to tile + FLIP_H, FLIP_V : in std_logic; -- flip sprite + XO : out std_logic_vector(PPU_SPRITE_POS_H_WIDTH-1 downto 0); -- new pixel position relative to tile + YO : out std_logic_vector(PPU_SPRITE_POS_V_WIDTH-1 downto 0)); -- new pixel position relative to tile +end ppu_sprite_transform; + +architecture Behavioral of ppu_sprite_transform is + signal FLIPPED_X : std_logic_vector(PPU_SPRITE_POS_H_WIDTH-1 downto 0); + signal FLIPPED_Y : std_logic_vector(PPU_SPRITE_POS_V_WIDTH-1 downto 0); +begin + FLIPPED_X <= std_logic_vector(to_unsigned(PPU_SPRITE_WIDTH-1 - to_integer(unsigned(XI)), PPU_SPRITE_POS_H_WIDTH)); + FLIPPED_Y <= std_logic_vector(to_unsigned(PPU_SPRITE_HEIGHT-1 - to_integer(unsigned(YI)), PPU_SPRITE_POS_V_WIDTH)); + + XO <= FLIPPED_X when FLIP_H = '1' else XI; + YO <= FLIPPED_Y when FLIP_V = '1' else YI; +end Behavioral; |