[PD] [PD-announce] jl lib

Joseph Larralde joseph.larralde at gmail.com
Thu Nov 8 18:27:16 CET 2018

Ok, this confirms umlaeute's PR and comments on my github repo.
His PR uses the garray_getfloatwords function and copies the contents to 
a float array to make it accessible to the c++ code.
It works very well (at least on my osx 32 bit pd), but I really dislike 
the waste of CPU it takes to duplicate all this data.
umlaeute also pointed me to a stride-based solution, which I think is 
the good direction to follow, so this is what I'm considering right now.
Thanks to both of you for this very useful and cross-validated tip :)

Le 08/11/18 à 17:54, Christof Ressi a écrit :
> in your case, casting definitly won't work in 64 bit Pd because a t_word is 64bit (the largest union member is a pointer) while a float is only 32 bit, so every other float would be garbage.
> you *could* introduce an optional stride value in bytes to your API by which you advance the pointers. but I would start with simply copying the array data and profile.
>> Gesendet: Donnerstag, 08. November 2018 um 16:50 Uhr
>> Von: "Joseph Larralde" <joseph.larralde at gmail.com>
>> An: "Christof Ressi" <christof.ressi at gmx.at>, Pd-List <pd-list at lists.iem.at>
>> Betreff: Re: [PD] [PD-announce] jl lib
>> Hmmm, that's what I was fearing.
>> In my c++ lib I read the buffers/tables contents passing them as
>> pointers to floats/doubles.
>> I'm not sure I can do this anymore with t_words, without either copying
>> the whole buffer to provide a simple pointer to it,
>> or modifying the c++ API in some other way, using getters ore some other
>> trick.
>> Le 08/11/18 à 15:12, Christof Ressi a écrit :
>>>> If one can just cast a t_word into a float or a double, things should go smoothly.
>>> the proper way is to access the union member of t_word, e.g.:
>>> myarray[0].w_float;
>>> Gesendet: Donnerstag, 08. November 2018 um 14:40 Uhr
>>> Von: "Lucas Cordiviola" <lucarda27 at hotmail.com>
>>> An: "Joseph Larralde" <joseph.larralde at gmail.com>, "pd-list at lists.iem.at" <pd-list at lists.iem.at>
>>> Betreff: Re: [PD] [PD-announce] jl lib
>>> On 11/8/2018 10:00 AM, Joseph Larralde wrote:Hi Lucas,
>>> Thanks a lot for the hints !
>>> I'm curious to know how you compiled the win64 version.
>>> >From what I remember, I installed msys2 and could only compile using the 32 bit version.
>>> pd-lib-builder is ready to use 32 and 64 bit Pds if they are in the default location:
>>> 32bit: C:\Program Files (x86)\pd
>>> 64bit: C:\Program Files\pd
>>> If you like you can specify any other dir when calling make:
>>> make PDDIR=your/path/to/pd
>>> On Msys2 you have to install the 64bit compiler (you probably did) :
>>> pacman -S mingw64/mingw-w64-x86_64-gcc
>>>    Later I added the [tonnetz] object to the library and had to add the "cflags = -std=c++11" line in the makefile
>>> in order for it to compile (because of some c++ vector initializers I introduced in my underlying c++ lib).
>>> Then I didn't push my investigations forward because ATM I was happy enough with the windows 32 bit version
>>> and had a working fat external for mac.Just curious:
>>> you don't get the "failed since it uses garray_getfloatarray while running 64-bit!" on OSX 64bit Pd?
>>> That's good to know that I just need to add a "+" to the makefile to get the lib to compile for windows 64 bit,
>>> and, apparently, to get all objects to work except gbend~ (if I understood correctly what you implied).
>>> I opened "jl-objects.pd" and all objects get created, then i started testing at random and when I opened "gbend~" help I spotted the error in the console.
>>> I'll try the changes that you suggested.
>>> I hope I won't have to rewrite a part of my underlying lib's API.
>>> If one can just cast a t_word into a float or a double, things should go smoothly.
>>> I wish I could help you more but C code is not for me yet.
>>> Cheers,
>>> Joseph
>>> Mensaje telepatico asistido por maquinas.
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