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root/radiance/ray/src/hd/rhdisp.h
Revision: 3.8
Committed: Thu Dec 11 16:45:59 1997 UTC (26 years, 11 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.7: +1 -13 lines
Log Message:
normalized commands between driver and standard input

File Contents

# Content
1 /* Copyright (c) 1997 Silicon Graphics, Inc. */
2
3 /* SCCSid "$SunId$ SGI" */
4
5 /*
6 * Header for holodeck display drivers.
7 */
8
9 /* display requests */
10 #define DR_NOOP 0 /* to release from vain DR_ATTEN */
11 #define DR_BUNDLE 1 /* lone bundle request */
12 #define DR_ATTEN 2 /* request for attention */
13 #define DR_SHUTDOWN 3 /* shutdown request */
14 #define DR_NEWSET 4 /* new bundle set */
15 #define DR_ADDSET 5 /* add to current set */
16 #define DR_ADJSET 6 /* adjust set quantities */
17 #define DR_DELSET 7 /* delete from current set */
18
19 /* server responses */
20 #define DS_BUNDLE 8 /* computed bundle */
21 #define DS_ACKNOW 9 /* acknowledge request for attention */
22 #define DS_SHUTDOWN 10 /* end process and close connection */
23 #define DS_ADDHOLO 11 /* register new holodeck */
24 #define DS_STARTIMM 12 /* begin immediate bundle set */
25 #define DS_ENDIMM 13 /* end immediate bundle set */
26
27 /*
28 * Normally, the server channel has priority, with the display process
29 * checking it frequently for new data. However, when the display process
30 * makes a request for attention (DR_ATTEN), the server will finish its
31 * current operations and flush its buffers, sending an acknowledge
32 * message (DS_ACKNOW) when it's done. This then allows the
33 * display process to send a long request to the holodeck server.
34 * Priority returns to normal after the following request.
35 */
36
37 #ifndef BIGREQSIZ
38 #define BIGREQSIZ 512 /* big request size (bytes) */
39 #endif
40
41 typedef struct {
42 int2 type; /* message type */
43 int4 nbytes; /* number of additional bytes */
44 } MSGHEAD; /* message head */
45
46 /*
47 * The display process is started with three arguments. The first argument
48 * is the short name of the holodeck file, appropriate for window naming, etc.
49 * The second and third arguments are the file descriptor numbers assigned to
50 * the server's standard output and input, respectively. The stdin and stdout
51 * of the display process are used for normal communication with the server,
52 * and are connected to pipes going each way. It is entirely appropriate
53 * for the display process to borrow the server's stdin and stdout for reading
54 * and writing user commands from the list in rhdriver.h. If standard input
55 * is not available for reading, then a descriptor of -1 will be passed.
56 * The standard output will always be available for writing, though it
57 * may go to /dev/null.
58 */