28.09.2012 20:47, Peter Alexander пишет:
On Friday, 28 September 2012 at 09:43:34 UTC, Timur Gafarov wrote:
dlib is a growing collection of native D language libraries serving as
a framework for various higher-level projects - such as game engines,
rendering pipelines and multimedia applications. It is written in D2
and has no external external dependencies aside D's standart library,
Phobos.
A note on your Vector implementation. Currently you use the vector
operators, e.g.
Vector!(T,size) opAddAssign (Vector!(T,size) v)
body
{
arrayof[] += v.arrayof[];
return this;
}
This is fine for large vectors, but (correct me if I'm wrong), your
vector class appears to be designed for small vectors. Those vector ops
currently call a asm optimised function that uses SIMD instructions in a
loop - it works well for larger vectors with hundreds of elements, but
for small vectors it's significantly faster to just use:
foreach (i; 0..size)
arrayof[i] += v.arrayof[i];
I've also noticed that you've provided Matrix2x2 and Matrix4x4 as
separate structs from the more generic Matrix. I'm guessing this is for
specialisation. A more idiomatic way to handle this would be to use
template specialisation to provide the optimised versions. That way,
when people use Matrix!(T, 2, 2) they get all the benefits of
Matrix2x2!T as well.
Thanks! I didn't realize that about vectors. I'm interested in
performance optimization, so I will fix that as soon as possible.
As for matrices - I used Matrix4x4 for a long time (that was just the
simplest way), and recently introduced that generalized version.
Eventually I will port everything into it.
