[AD] Windows Addition for Message Parsing

["Elias Zacarias" <ezacarias@xxxxxxxxxx>]

WARNING: I don't speak english. I'll try to be as clear as possible,
try to bear with me.

I'm working on a project where multiple  mice input was needed and I found this
http://jstookey.com/arcade/rawmouse/
the raw mouse code allows you to detect multiple mice BUT it parses
WM_INPUT messages for its implementation.

I am using allegro for graphics and sound so I wanted to integrate it
with my project.

My first approach was creating a window by hand, with a procedure of
my own for parsing its messages, then attaching the window to allegro
with win_set_window() and controlling the peek-translate-dispatch
process in my code.
It did work but I had to integrate the game loop somewhere with a
sleep for parsing messages. far from ideal.

So I modified the allegro library code and introduced a function that
allows the user to define a sort of callback.
If such a function is defined, allegro calls it as it enters the
WindowProc (directx_wnd_proc), then the user defined function gets the
chance to parse the messages... if the user-defined function returns
0, then the message it's not parsed by allegro, otherwise it gets
further parsed within directx_wnd_proc if needed.

That lets me leave the window and message handling to allegro but
still being able to parse the WM_INPUT messages when received.

I've attached a patch for Allegro 4.22 sources and the information
needed for doing the mod "by hand" if patch doesn't work.

++ I would like to know if you find the modification useful and worth
to be included in future releases of Allegro. ++

Thanks to trentg, Tomasu, svenVI who supported me on IRC to post this
here and also gave me guidelines on how to post it.

Feedback is appreciated. S.P.A.M is not.


-- 
 Elias Zacarias

Attachment: win_set_msg_pre_proc.zip
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