Lua BitOps

Development < Lua Scripting < Lua BitOps

Bit Operators

math.bit_and ( number a1, number a2 , ... )
return: number i

Returns the bitwise AND of all arguments. Only use up to 24 bit integers.

math.bit_or ( number a1, number a2 , ... )
return: number i

Returns the bitwise OR of all arguments. Only use up to 24 bit integers.

math.bit_xor ( number a1, number a2 , ... )
return: number i

Returns the bitwise XOR of all arguments. Only use up to 24 bit integers.

math.bit_inv ( number a1 )
return: number i

Returns the bitwise NOT of the 24 bit integer argument.

math.bit_bits ( number a1, number a2 , ... )
return: number i

Set each of the bits of a 24 bit integer. Returns result = result OR (1 << a1) OR (1 << a2) OR ...;)

-- Note: there are no bit shift. Use those Lua functions instead for 24 bits bitshift
-- 24 bits because only the 24 bits of the mantissa can be easily used in a 32 bit float
-- bitshift functions (<<, >> equivalent)

-- shift left
local function lsh(value,shift)
    return (value*(2^shift)) % 2^24
end

-- shift right
local function rsh(value,shift)
    return math.floor(value/2^shift) % 2^24
end