Enhancement: Access to (meta)methods for Vector2 and Vector3 types #32
Description
ffi.metatype assigns to all ffi-types one single global ffi-metatable (that is used for any metatype object):
local vec2 = rl.new("Vector2") local Vector2_mt = getmetatable(vec2) --> "ffi" local Vector2_mt = debug.getmetatable(vec2) local Vector3_mt = debug.getmetatable(rl.new("Vector3")) -- this is single global metatable for every metatype object that calls selects metamethod dependent on object type. print(Vector2_mt == Vector3_mt) --> trueSo, we can't safely add something even with debug.getmetatable.
Possible fix.
/compat.lua:
local Vector2_mt = { __add = function(...) ... end, ... } -- add this little thing Vector2_mt.__index = Vector2_mt -- looping but okay ffi.metatype("Vector2", Vector2_mt)Now we can take any Vector2, get it's index and fill it with new methods (or even metamethods):
local Vec2 = rl.new("Vector2") local Vector2_mt = Vec2.__index Vector2_mt.Negate= rl.Vector2Negate Vector2_mt.__pow = function(self, n) return rl.new("Vector2", self.x^n, self.y^n) end -- Can be used everywhere local OtherVec2 = rl.new("Vector2", 10, 20) print(OtherVec2:Negate()) --> Vector2 (-100 -200) print(OtherVec2^2) --> Vector2 (100 400)