1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
|
3 |
/* SCCSid "$SunId$ SGI" */ |
4 |
|
5 |
/* |
6 |
* Header file for holodeck device driver routines. |
7 |
*/ |
8 |
|
9 |
#include "view.h" |
10 |
|
11 |
extern struct driver { |
12 |
char *name; /* holodeck name or title */ |
13 |
VIEW v; /* base view parameters */ |
14 |
int hres, vres; /* base view resolution */ |
15 |
int ifd; /* input file descriptor (for select) */ |
16 |
} odev; /* our open device */ |
17 |
|
18 |
extern int imm_mode; /* bundles are being delivered immediately */ |
19 |
|
20 |
extern double eyesepdist; /* world eye separation distance */ |
21 |
|
22 |
/* user commands */ |
23 |
#define DC_SETVIEW 0 /* set the base view */ |
24 |
#define DC_GETVIEW 1 /* print the current base view */ |
25 |
#define DC_LASTVIEW 2 /* restore previous view */ |
26 |
#define DC_PAUSE 3 /* pause the current calculation */ |
27 |
#define DC_RESUME 4 /* resume the calculation */ |
28 |
#define DC_REDRAW 5 /* redraw from server */ |
29 |
#define DC_KILL 6 /* kill rtrace process(es) */ |
30 |
#define DC_RESTART 7 /* restart rtrace process(es) */ |
31 |
#define DC_CLOBBER 8 /* clobber holodeck file */ |
32 |
#define DC_QUIT 9 /* quit the program */ |
33 |
|
34 |
#define DC_NCMDS 10 /* number of commands */ |
35 |
|
36 |
/* dev_input() returns flags from above */ |
37 |
#define DFL(dc) (1<<(dc)) |
38 |
|
39 |
#define CTRL(c) ((c)-'@') |
40 |
/* commands entered in display window */ |
41 |
#define DV_INIT {'\0','v','l','p','\r',CTRL('L'),'K','R','C','q'} |
42 |
/* commands entered on stdin */ |
43 |
#define DC_INIT {"VIEW=","where","last","pause","resume","redraw",\ |
44 |
"kill","restart","clobber","quit"} |
45 |
|
46 |
|
47 |
/************************************************************************ |
48 |
* Driver routines (all are required): |
49 |
|
50 |
|
51 |
void |
52 |
dev_open(nm) : prepare the device |
53 |
char *nm; : appropriate title bar annotation |
54 |
|
55 |
Sets fields of odev structure and prepares the display for i/o. |
56 |
The base view type, horizontal and vertical view angles and other |
57 |
default parameters in odev.v should also be assigned. |
58 |
|
59 |
|
60 |
int |
61 |
dev_view(nv) : set base view parameters |
62 |
VIEW *nv; : the new view |
63 |
|
64 |
Updates the display for the given base view change. |
65 |
Look for nv==&odev.v when making view current after dev_input() |
66 |
returns DEV_NEWVIEW flag. Return 1 on success, or 0 if the |
67 |
new view would conflict with device requirements. In the latter |
68 |
case, reset parameters in nv to make it more agreeable, calling |
69 |
error(COMMAND, "appropriate user warning"). |
70 |
|
71 |
|
72 |
void |
73 |
dev_clear() : clear device memory |
74 |
|
75 |
Clear the device memory in preparation for fresh data. Clearing |
76 |
the screen is optional. |
77 |
|
78 |
|
79 |
void |
80 |
dev_value(c, d, p) : register new point of light |
81 |
COLR c; : pixel color (RGBE) |
82 |
FVECT d; : ray direction vector |
83 |
FVECT p; : world intersection point |
84 |
|
85 |
Add the given color point to the display output queue. If imm_mode is |
86 |
non-zero, then values are being sent in rapid succession. If p is NULL, |
87 |
then the point is at infinity. |
88 |
|
89 |
|
90 |
int |
91 |
dev_flush() : flush the output and prepare for select call |
92 |
|
93 |
Updates display, taking any pending action required before select(2) call. |
94 |
Returns non-zero if there is device input available. |
95 |
|
96 |
|
97 |
int |
98 |
dev_input() : process pending display input |
99 |
|
100 |
Called when odev struct file descriptor shows input is ready. |
101 |
Returns flags indicating actions to take in the control process. |
102 |
If the DC_VIEW or DC_RESIZE flag is returned, the odev |
103 |
structure must be updated beforehand. |
104 |
|
105 |
void |
106 |
dev_auxcom(cmd, args) : process auxiliary command |
107 |
char *cmd, *args; : command name and argument string |
108 |
|
109 |
Execute an auxiliary command (not one of those listed at the head of |
110 |
this file). The cmd argument points to the command name itself, and |
111 |
the args argument points to a string with the rest of the input line. |
112 |
If the command isn't known or there ARE no auxiliary commands, print |
113 |
an appropriate COMMAND error message and return. |
114 |
|
115 |
|
116 |
VIEW * |
117 |
dev_auxview(n, hv) : return nth auxiliary view |
118 |
int n; : auxiliary view number |
119 |
int hv[2]; : returned horiz. and vert. image resolution |
120 |
|
121 |
Return the nth auxiliary view associated with the current base view. |
122 |
The hv entries are assigned the horizontal and vertical view resolution, |
123 |
respectively. Function returns NULL if there are no more auxiliary |
124 |
views. The zeroeth auxiliary view is the base view itself. |
125 |
|
126 |
|
127 |
void |
128 |
dev_close() : close the display |
129 |
|
130 |
Close the display device and free up resources in preparation for exit. |
131 |
Set odev.v.type=0 and odev.hres=odev.vres=0 when done. |
132 |
|
133 |
|
134 |
************************************************************************/ |
135 |
|
136 |
|
137 |
extern VIEW *dev_auxview(); |