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root/radiance/ray/src/hd/rhdisp.h
Revision: 3.4
Committed: Thu Nov 20 18:04:59 1997 UTC (26 years, 11 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.3: +1 -0 lines
Log Message:
added noop function to recover from vain DR_ATTEN

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 /* 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_DELSET 6 /* delete from current set */
17
18 /* server responses */
19 #define DS_BUNDLE 7 /* computed bundle */
20 #define DS_ACKNOW 8 /* acknowledge request for attention */
21 #define DS_SHUTDOWN 9 /* end process and close connection */
22 #define DS_ADDHOLO 10 /* register new holodeck */
23 #define DS_STARTIMM 11 /* begin immediate bundle set */
24 #define DS_ENDIMM 12 /* end immediate bundle set */
25
26 /*
27 * Normally, the server channel has priority, with the display process
28 * checking it frequently for new data. However, when the display process
29 * makes a request for attention (DR_ATTEN), the server will finish its
30 * current operations and flush its buffers, sending an acknowledge
31 * message (DS_ACKNOW) when it's done. This then allows the
32 * display process to send a long request to the holodeck server.
33 * Priority returns to normal after the following request.
34 */
35
36 #ifndef BIGREQSIZ
37 #define BIGREQSIZ 512 /* big request size (bytes) */
38 #endif
39
40 typedef struct {
41 int2 type; /* message type */
42 int4 nbytes; /* number of additional bytes */
43 } MSGHEAD; /* message head */