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raypwin.c
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Sun, Nov 17, 10:58

raypwin.c
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#ifndef lint
static const char RCSid[] = "$Id: raypwin.c,v 2.9 2019/01/08 00:16:31 greg Exp $";
#endif
/*
* raypwin.c - interface for parallel rendering using Radiance (Windows ver)
*
* External symbols declared in ray.h
*/
#include "copyright.h"
/*
* See raypcalls.c for an explanation of these routines.
*/
/***** XXX CURRENTLY, THIS IS JUST A COLLECTION OF IMPOTENT STUBS XXX *****/
#include "ray.h"
int ray_pnprocs = 0; /* number of child processes */
int ray_pnidle = 0; /* number of idle children */
static RAY queued_ray;
void
ray_pinit( /* initialize ray-tracing processes */
char *otnm,
int nproc
)
{
ray_pdone(0);
ray_init(otnm);
ray_popen(nproc);
}
int
ray_psend( /* add a ray to our send queue */
RAY *r
)
{
if (r == NULL)
return(0);
if (ray_pnidle <= 0)
return(0);
queued_ray = *r;
ray_pnidle = 0;
return(1);
}
int
ray_pqueue( /* queue a ray for computation */
RAY *r
)
{
RNUMBER rno;
if (r == NULL)
return(0);
if (ray_pnidle <= 0) {
RAY new_ray = *r;
*r = queued_ray;
queued_ray = new_ray;
}
rno = r->rno;
r->rno = raynum++;
samplendx++;
rayvalue(r);
r->rno = rno;
return(1);
}
int
ray_presult( /* check for a completed ray */
RAY *r,
int poll
)
{
if (r == NULL)
return(0);
if (ray_pnidle <= 0) {
*r = queued_ray;
r->rno = raynum++;
samplendx++;
rayvalue(r);
r->rno = queued_ray.rno;
ray_pnidle = 1;
return(1);
}
return(0);
}
void
ray_pdone( /* reap children and free data */
int freall
)
{
ray_done(freall);
ray_pnprocs = ray_pnidle = 0;
}
void
ray_popen( /* open the specified # processes */
int nadd
)
{
if (ray_pnprocs + nadd > 1) {
error(WARNING, "only single process supported");
nadd = 1 - ray_pnprocs;
}
ray_pnprocs += nadd;
ray_pnidle += nadd;
}
void
ray_pclose( /* close one or more child processes */
int nsub
)
{
if ((nsub <= 0) | (nsub > ray_pnprocs))
nsub = ray_pnprocs;
ray_pnprocs -= nsub;
if ((ray_pnidle -= nsub) < 0)
ray_pnidle = 0;
}

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