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MindCaged
Newbie cheater
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Joined: 25 Apr 2013
Posts: 10
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 Posted: Thu Apr 25, 2013 2:24 pm Post subject: Trouble making a custom type in Lua |
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Okay, I've been looking and looking and can't find any documentation or examples of making a custom value type in Lua.
I'm currently trying to do a simple thing where I multiply the 4 byte value by 2 and add 1 for RPG Maker games. I could just do the math manually, but it'd be a time saver if I could get it to be automatic. I'm not familiar enough with assembly to try to do it there, even though I'm sure it'd probably be really simple, like a bit shift and add 1 or something.
I also am just curious how to do it in Lua. I have had some experience with it in the past, although I'm a little rusty, and I'm not sure what libraries are included. It'd be pretty useful to have a function to convert between bytes and a 4-byte integer, instead of having to do the math.
This is what I've tried so far, although I can't get it to register so I'm wondering if I made a syntax error.
I'm using version 6.1, so I'm wondering if it's bugged, because nothing happens when I click the ok button to try to add it.
| Code: | --Note: keep the function base name unique.
typename="RPG Maker Value" --shown as the typename in ce
bytecount=4 --number of bytes of this type
functionbasename="rpgmakerval"
function rpgmakerval_bytestovalue(b1,b2,b3,b4)
--Add extra byte parameters as required
local tmp
tmp = ((b4 * 256 + b3) * 256 + b2) * 256 + b1
return (tmp-1)/2
end
function rpgmakerval_valuetobytes(i)
local b1, b2, b3, b4
i = i * 2 + 1
b1 = i % 256
i = (i - b1) / 256
b2 = i % 256
i = (i - b2) / 256
b3 = i % 256
i = (i - b3) / 256
b4 = i
--return the bytes to write (usually only used when you change the value)
return b1,b2,b3,b4
end
return typename,bytecount,functionbasename
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Edit: Hmm, I updated to 6.2 and it now seems to be working fine. I'm not sure if it's the best written code though.
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mgr.inz.Player
I post too much
 Reputation: 218
Joined: 07 Nov 2008
Posts: 4438
Location: W kraju nad Wisla. UTC+01:00
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| Posted: Thu Apr 25, 2013 5:28 pm Post subject: |
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better use AA custom type:
| Code: | alloc(ConvertRoutine,1024)
alloc(ConvertBackRoutine,1024)
alloc(TypeName,256)
alloc(ByteSize,4)
TypeName:
db 'RPG Maker Value - AA',0
ByteSize:
dd 4
ConvertRoutine:
[64-bit]
mov eax,[rcx]
dec eax
shr eax,1
ret
[/64-bit]
[32-bit]
push ebp
mov ebp,esp
mov eax,[ebp+8]
mov eax,[eax]
dec eax
shr eax,1
pop ebp
ret 4
[/32-bit]
ConvertBackRoutine:
[64-bit]
shl ecx,1
inc ecx
mov [rdx],ecx
ret
[/64-bit]
[32-bit]
push ebp
mov ebp,esp
push eax
push ebx
mov eax,[ebp+8]
mov ebx,[ebp+c]
shl eax,1
inc eax
mov [ebx],eax
pop ebx
pop eax
pop ebp
ret 8
[/32-bit]
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