Re: Fixed-point LUA_NUMBER
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- Subject: Re: Fixed-point LUA_NUMBER
- From: Enrico Colombini <erix@...>
- Date: 2007年10月16日 11:29:56 +0200
Asko Kauppi wrote:
Depends on your need of maths, since things s.a. sin, cos et.al. will
lose their usefulness pretty immediately. I would actually leave such
undefined for a fixed-point Lua implementation.
Yes, that's to be expected.
The C API would be problematic; unless you keep 'lua_Number' as a
familiar double and only do the conversion within the core.
This would be problem #1. Could you be more specific about the
mechanisms that would break?
You wouldn't be aware of how addon modules deal with lua_Number,
> and you wouldn't really even want to know. :)
I wouldn't use any external module... nor many of the standard libs.
This means you wouldn't just get away with redefining LUA_NUMBER.
Well, it was too good to be true :-)
If you get it to work, I'd be interested to add fixed point maths into
the Numbers patch. And to hear performance comparisons against a hybrid
float+int32 approach.
Unfortunately, the fixed-point code is not mine and not public either,
but should I try this road I'll give some stats. At the moment it's just
a hypothesis among many.
Enrico