hi list, hi miller,

I've made a little patch to enable externs

to modify the dsp chain while the dsp processing

is running... this avoids to restart dsp processing

when a parameter is changed, this is illustrated

by the "spigot~" extern attached.

Without this patch, I had to restart dsp processing

and all other dsp objects got interrupted.

That was really annoying !!!

What was made basically was adding the following code :

d_ugen.c :

################################################

    /* function to dynamically change dsp functions parameters
       arguments are :
       f : pointer to your dsp function
       rank : rank of the argument to change
       value : new value of this parameter

       QUITE DANGEROUS !!! no checking is possible
       because the number of arguments is not stored in dsp_chain
       Copyleft ydegoyon@free.fr */
void dsp_mod(t_perfroutine f, int rank, int value )
{
    va_list ap;
    t_int *pdsp_chain = dsp_chain;
    t_int i;

    while ( pdsp_chain ){
       if ( *pdsp_chain == (t_int)f ){
          *(pdsp_chain+rank) = value;
          post ( "dsp_mod : warning : modifying dsp chain, better know what you're doing!!!!" );
          break;
       }
       pdsp_chain++;
    }
}
################################################

This function has to be exported in m_pd.h :

################################################

EXTERN void dsp_mod(t_perfroutine f, int rank, int value);
################################################

An example of use is available in spigot~.c attached.

This is really dangerous to use this,

because it enables an extern to transform

dsp_chain into a mess,

so use it with care !!!

Cheers,

Yves Degoyon.

PS : it seems to be patch day, so I don't deliver this as a patch

for incremental reasons ( I've applied some patches myself ).