[rdnzl-devel] (no subject)

[Dan Muller]

My first post to this list...

I started playing around with RDNZL, Direct3D 9.0, and the evaluation 
version of LispWorks for Windows about a week ago. Very nice! But I've 
run into an interesting problem.

Direct3D uses single floats throughout its interface, but in LispWorks 
for Windows, all floating point types are equivalent to double-float. 
So I've got this rather difficult situation, where RDNZL can never find 
a method if it takes a single float argument! Even if it could find it, 
a down-conversion from double to single float would be needed, which 
probably shouldn't occur implicitly.

I tried explicitly calling System.Convert.ToSingle, but by the time I 
can get my hands on the return value, it has been turned back into a 
double! I haven't been able to figure out a way around this without 
modifying RDNZL, or writing some sort of .NET function that returned a 
boxed single. But I'm not sure that the latter wouldn't be unboxed, or 
that it would give the correct type for the method lookup in RDNZL.

Any ideas?

-- 
Dan Muller


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