[Bf-committers] Thoughts on 64 bits migration, windows/unix

[Ton Roosendaal]

Hi,

I can understand such an approach for a new code project... but:

a) there's already a good LP64 standard we apply to
b) five years ago the 64 bits port of Blender was made/tested already
c) there's a massive amount of code!

The work todo mainly is getting the Windows version to comply, and of  
course go over the new code as was added after 2000.

-Ton-

On 30 Apr, 2005, at 18:19, john tuffen wrote:

> In my day job as a software engineer (I'm involved in 'proper'  
> embedded software
> for the automotive industry - operating systems/communications systems  
> for
> engine controllers, ABS devices and the like) the accepted standard for
> cross-platform development is to typedef (on a per-target basis) basic  
> types
> with defined sizes. i.e.:
>
> UInt8  (unsigned 8 bit value)
> UInt16 (unsigned 16 bit value)
> SInt8  (Signed 8 bit value)
>
> ... etc. (Automotive usually stops at 32-bit quantities, with a  
> 'natural word'
> type thrown in for use in for loops etc.). The end state being that  
> the code
> has no 'int', 'short', 'char', 'long' references in it (except in the  
> header
> that typedefs the basic types, and that coders know exactly what the  
> range of
> each variable is.
>
> Definitions also differ between compilers on the same platform (or at  
> least they
> do for the targets I deal with!!) so headers are not simply  
> Linux/OSX/Windows
> specific, they are also gcc/VC/Borland (whatever) dependent.
>
> It seems to me that this might be useful in the case of Blender as  
> well, now
> that we're seeing 64 bits coming in (so you can be sure that a SInt64  
> is 64 bit
> signed integer regardless of the OS)
>
> Any thoughts on this? It's a little bit of work I know, but in reality  
> it can be
> mostly handled by sed...
>
>
>
> john..
>
> --
> http://www.iwari.com/
> http://www.minimism.com/
> ---
>
> Quoting Ton Roosendaal <ton at blender.org>:
>
>> We'll have to define the Blender standard for migrating to 64 bits for
>> all platforms... unfortunately the unix and windows worlds haven't
>> adopted the same standard...
>>
>> - Windows keeps the "long" 32 bits in all cases, for unix it is 32 or
>> 64 bits.
>> - Windows doesn't have a "long long" (int64 instead).
>
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------------------------------------------------------------------------ 
--
Ton Roosendaal  Blender Foundation ton at blender.org  
http://www.blender.org