> On Jun 15, 2018, at 3:45 PM, Karoly Balogh (Charlie/SGR)
> <[email protected]> wrote:
>
> The whole idea of a packed record is to ignore alignment and "pack" the
> fields ignoring padding and alignment. Use a normal record without
> "packed", or add the padding fields manually, if you still have to use a
> packed record for whatever reason.
>
> BTW, $align specifies the alignment in *BYTES* not in bits. So to align to
> 32bits you need {$align 4}. But Free Pascal also supports {$packrecords
> C}, where it will try to mimic the C compiler's alignment as native to the
> target platform. In any unit which needs to interface to a C library, I'd
> use {$packrecords C} and no {$align}
Ok, I see now. I tried adding {$packrecords C} in all units but the size still
comes back as 24 instead of 32. So what is the C compiler really doing I
wonder? I found out through trial and error I need 2 floats in-between both
fields to get proper alignment but why is this? I hate to be adding random
space into records which may break on other machines or if built with different
compilers (I’m using ppcx64 btw if that matters).
type
TAAPLVertex = record
position: vector_float2;
padding_0: simd_float;
padding_1: simd_float;
color: vector_float4;
end;
Regards,
Ryan Joseph
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