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-Design of SDL::Rect +The beginnings of modular design for SDL Perl

-

you say things,
I hear,
but don't listen,

you show things,
I see,
but don't understand,

you write things,
I read,
but don't know.

Lately we have been working on cleaning up the XS name spaces of SDL perl. After some bumps and falls we came up with a separated Rect module. Rect is one of the most simple C struct as shown below.



Using the awesome perlobject.map as a reference I was able to create a blessed perl object in XS. So now SDL::Rect->new(...) gave us a blessed reference ready to go. And as an icing it would destroy itself properly no matter where it was used. But once I brought it into our existing code base, garu pointed out the extending it was a little bit of a mess. So far to extend Rect we have to something like below. Any comment or advice would be much appreciated.





Have at it I am a big boy. You can grab the code like this.
Only If you don't already have a local git repo:

mkdir SDL
cd SDL
git init .

Then do this or skip to this if you already have a local git repo
git pull git://github.com/kthakore/SDL_perl.git experimental
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“Do or do not... there is no try.”
--yoda

The design before


The bindings before were all in one huge XS file. This was then exported into the SDL module. This means that the XS file has to handle with macros if any component (e.x SDL_Mixer) is not compiled. Moreover having ever binding in one XS file prevents use to treat C structs as object with only one point of free and malloc. This would be BEGIN and DESTROY in Perl. Also the monolithic design introduces a lot of bugs because we have to use free and malloc all over the place. Lastly SDL monolithic design has the constructor for all structs in both Perl and in XS.

The design we are aiming for

Simple one XS per Module. This would also simplify the Build code.

First Step


We have began with SDL Rect. It is in github master branch now. We are in the progress of making it back compatible. Originally SDL::Rect took named variables as parameters for new(). Now since the constructor is in XS we have only unnamed parameters.


Before


SDL::Rect->new( -x => 0, -y => 0, -width => 0, -height => 0);

After


SDL::Rect->new(0, 0, 0, 0);

Ideally we would like both ways of constructing Rect.
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