| 23 |
|
* The first step is opening one or more rendering processes |
| 24 |
|
* with a call to ray_pinit(oct, nproc). Before calling fork(), |
| 25 |
|
* ray_pinit() loads the octree and data structures into the |
| 26 |
< |
* caller's memory. This permits all sorts of queries that |
| 27 |
< |
* wouldn't be possible otherwise, without causing any real |
| 26 |
> |
* caller's memory, and ray_popen() synchronizes the ambient |
| 27 |
> |
* file, if any. Shared memory permits all sorts of queries |
| 28 |
> |
* that wouldn't be possible otherwise, without causing any real |
| 29 |
|
* memory overhead, since all the static data are shared |
| 30 |
|
* between processes. Rays are then traced using a simple |
| 31 |
|
* queuing mechanism, explained below. |
| 32 |
|
* |
| 33 |
< |
* The ray queue holds as many rays as there are rendering |
| 34 |
< |
* processes. Rays are queued and returned by a single |
| 33 |
> |
* The ray queue holds at least RAYQLEN rays, up to |
| 34 |
> |
* as many rays as there are rendering processes. |
| 35 |
> |
* Rays are queued and returned by a single |
| 36 |
|
* ray_pqueue() call. A ray_pqueue() return |
| 37 |
|
* value of 0 indicates that no rays are ready |
| 38 |
|
* and the queue is not yet full. A return value of 1 |
| 107 |
|
* Note: These routines are written to coordinate with the |
| 108 |
|
* definitions in raycalls.c, and in fact depend on them. |
| 109 |
|
* If you want to trace a ray and get a result synchronously, |
| 110 |
< |
* use the ray_trace() call to compute it in the parent process |
| 110 |
> |
* use the ray_trace() call to compute it in the parent process. |
| 111 |
|
* This will not interfere with any subprocess calculations, |
| 112 |
|
* but beware that a fatal error may end with a call to quit(). |
| 113 |
|
* |
| 140 |
|
#include "selcall.h" |
| 141 |
|
|
| 142 |
|
#ifndef RAYQLEN |
| 143 |
< |
#define RAYQLEN 16 /* # rays to send at once */ |
| 143 |
> |
#define RAYQLEN 12 /* # rays to send at once */ |
| 144 |
|
#endif |
| 145 |
|
|
| 146 |
|
#ifndef MAX_RPROCS |
| 172 |
|
#define sendq_full() (r_send_next >= RAYQLEN) |
| 173 |
|
|
| 174 |
|
static int ray_pflush(void); |
| 175 |
< |
static void ray_pchild(int fd_in, int fd_out); |
| 175 |
> |
static void ray_pchild(int fd_in, int fd_out); |
| 176 |
|
|
| 177 |
|
|
| 178 |
|
extern void |
| 269 |
|
r_send_next++; |
| 270 |
|
return(rval); /* done */ |
| 271 |
|
} |
| 272 |
< |
/* add ray to send queue */ |
| 272 |
> |
/* else add ray to send queue */ |
| 273 |
|
r_queue[r_send_next] = *r; |
| 274 |
|
r_send_next++; |
| 275 |
|
/* check for returned ray... */ |
| 372 |
|
rp->slights = NULL; |
| 373 |
|
} |
| 374 |
|
/* return first ray received */ |
| 375 |
< |
*r = r_queue[r_recv_first]; |
| 374 |
< |
r_recv_first++; |
| 375 |
> |
*r = r_queue[r_recv_first++]; |
| 376 |
|
return(1); |
| 377 |
|
} |
| 378 |
|
|
| 448 |
|
nadd = MAX_NPROCS - ray_pnprocs; |
| 449 |
|
if (nadd <= 0) |
| 450 |
|
return; |
| 451 |
< |
fflush(stderr); /* clear pending output */ |
| 452 |
< |
fflush(stdout); |
| 451 |
> |
ambsync(); /* load any new ambient values */ |
| 452 |
> |
fflush(NULL); /* clear pending output */ |
| 453 |
|
while (nadd--) { /* fork each new process */ |
| 454 |
|
int p0[2], p1[2]; |
| 455 |
|
if (pipe(p0) < 0 || pipe(p1) < 0) |
