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lua-l archive |
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I would
think this is what you want to do int vec3add(lua_State *L) { p=(vector3*)lua_newuserdata(L,sizeof(vector3)); vector3* v=(vector3*)lua_touserdata(L,1); vector3* v2=(vector3*)lua_touserdata(L,2); *p = *v + *v2 lua_getmetatable(L, 1); // ‘v’ should have
one, right? lua_setmetatable(L, -1); // in case you
ever wanted to add something to ‘p’ return 1; } -----Original
Message----- ah crap
i answered my own question.. its always the way.. anyway
here what i did, maybe its evil in some way please feel free to correct it.. int vec3add(lua_State *L) { vector3* v=(vector3*)lua_touserdata(L,1); vector3* v2=(vector3*)lua_touserdata(L,2); *v+=*v2; vector3* p; p=(vector3*)lua_newuserdata(L,sizeof(vector3)); p=v; lua_pushvalue(L, 1); return 1; } it turns out that
lua_newuserdata, pushes itself onto the stack anyway.. -----
Original Message -----
To: Multiple
recipients of list Sent: Tuesday, May 13, 2003
11:58 PM Subject: on the
topic of userdata ok this
is what i want to do, i've
got a vector3 class similar to the vector3 tutorial in the example but using
metatables of cause.. and
what im trying to do is the __add for it, but im not sure what to return, or
push onto the stack i should say. heres
what im doing in c atm.. int
vec3add(lua_State *L) { vector3*
v=(vector3*)lua_touserdata(L,1); vector3*
v2=(vector3*)lua_touserdata(L,2); *v+=*v2; lua_pushlightuserdata(L,
v); return 1; } and in
lua its just something like a=a+b; anyway..
nothing happens. but this is all i could think of, does anyone have any ideas
on what i should do or what im doing wrong. |