| 1 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* mx_data.c - routine for stored mixtures. |
| 9 |
* |
| 10 |
* 11/2/88 |
| 11 |
*/ |
| 12 |
|
| 13 |
#include "ray.h" |
| 14 |
|
| 15 |
#include "data.h" |
| 16 |
|
| 17 |
#include "func.h" |
| 18 |
|
| 19 |
/* |
| 20 |
* A stored mixture is specified: |
| 21 |
* |
| 22 |
* modifier mixdata name |
| 23 |
* 6+ foremod backmod func dfname vfname v0 v1 .. xf |
| 24 |
* 0 |
| 25 |
* n A1 A2 .. |
| 26 |
* |
| 27 |
* A picture mixture is specified as: |
| 28 |
* |
| 29 |
* modifier mixpict name |
| 30 |
* 7+ foremod backmod func pfname vfname vx vy xf |
| 31 |
* 0 |
| 32 |
* n A1 A2 .. |
| 33 |
* |
| 34 |
* |
| 35 |
* Vfname is the name of the file where the variable definitions |
| 36 |
* can be found. The list of real arguments can be accessed by |
| 37 |
* definitions in the file. Dfname is the data file. |
| 38 |
* (Pfname is a picture file.) |
| 39 |
* The dimensions of the data files and the number |
| 40 |
* of variables must match. The func is a single argument |
| 41 |
* function in the case of mixdata (three argument in the case |
| 42 |
* of mixpict), which returns the corrected data value given the |
| 43 |
* interpolated value from the file. The xf is a transformation |
| 44 |
* to get from the original coordinates to the current coordinates. |
| 45 |
*/ |
| 46 |
|
| 47 |
|
| 48 |
mx_data(m, r) /* interpolate mixture data */ |
| 49 |
register OBJREC *m; |
| 50 |
RAY *r; |
| 51 |
{ |
| 52 |
OBJECT obj; |
| 53 |
double coef; |
| 54 |
double pt[MAXDIM]; |
| 55 |
DATARRAY *dp; |
| 56 |
OBJECT mod[2]; |
| 57 |
register MFUNC *mf; |
| 58 |
register int i; |
| 59 |
|
| 60 |
if (m->oargs.nsargs < 6) |
| 61 |
objerror(m, USER, "bad # arguments"); |
| 62 |
obj = objndx(m); |
| 63 |
for (i = 0; i < 2; i++) |
| 64 |
if (!strcmp(m->oargs.sarg[i], VOIDID)) |
| 65 |
mod[i] = OVOID; |
| 66 |
else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) { |
| 67 |
sprintf(errmsg, "undefined modifier \"%s\"", |
| 68 |
m->oargs.sarg[i]); |
| 69 |
objerror(m, USER, errmsg); |
| 70 |
} |
| 71 |
dp = getdata(m->oargs.sarg[3]); |
| 72 |
i = (1 << dp->nd) - 1; |
| 73 |
mf = getfunc(m, 4, i<<5, 0); |
| 74 |
setfunc(m, r); |
| 75 |
errno = 0; |
| 76 |
for (i = 0; i < dp->nd; i++) { |
| 77 |
pt[i] = evalue(mf->ep[i]); |
| 78 |
if (errno) |
| 79 |
goto computerr; |
| 80 |
} |
| 81 |
coef = datavalue(dp, pt); |
| 82 |
errno = 0; |
| 83 |
coef = funvalue(m->oargs.sarg[2], 1, &coef); |
| 84 |
if (errno) |
| 85 |
goto computerr; |
| 86 |
if (raymixture(r, mod[0], mod[1], coef)) { |
| 87 |
if (m->omod != OVOID) |
| 88 |
objerror(m, USER, "inappropriate modifier"); |
| 89 |
return(1); |
| 90 |
} |
| 91 |
return(0); |
| 92 |
computerr: |
| 93 |
objerror(m, WARNING, "compute error"); |
| 94 |
return(0); |
| 95 |
} |
| 96 |
|
| 97 |
|
| 98 |
mx_pdata(m, r) /* interpolate mixture picture */ |
| 99 |
register OBJREC *m; |
| 100 |
RAY *r; |
| 101 |
{ |
| 102 |
OBJECT obj; |
| 103 |
double col[3], coef; |
| 104 |
double pt[MAXDIM]; |
| 105 |
DATARRAY *dp; |
| 106 |
OBJECT mod[2]; |
| 107 |
register MFUNC *mf; |
| 108 |
register int i; |
| 109 |
|
| 110 |
if (m->oargs.nsargs < 7) |
| 111 |
objerror(m, USER, "bad # arguments"); |
| 112 |
obj = objndx(m); |
| 113 |
for (i = 0; i < 2; i++) |
| 114 |
if (!strcmp(m->oargs.sarg[i], VOIDID)) |
| 115 |
mod[i] = OVOID; |
| 116 |
else if ((mod[i] = lastmod(obj, m->oargs.sarg[i])) == OVOID) { |
| 117 |
sprintf(errmsg, "undefined modifier \"%s\"", |
| 118 |
m->oargs.sarg[i]); |
| 119 |
objerror(m, USER, errmsg); |
| 120 |
} |
| 121 |
dp = getpict(m->oargs.sarg[3]); |
| 122 |
mf = getfunc(m, 4, 0x3<<5, 0); |
| 123 |
setfunc(m, r); |
| 124 |
errno = 0; |
| 125 |
pt[1] = evalue(mf->ep[0]); /* y major ordering */ |
| 126 |
pt[0] = evalue(mf->ep[1]); |
| 127 |
if (errno) |
| 128 |
goto computerr; |
| 129 |
for (i = 0; i < 3; i++) /* get pixel from picture */ |
| 130 |
col[i] = datavalue(dp+i, pt); |
| 131 |
errno = 0; /* evaluate function on pixel */ |
| 132 |
coef = funvalue(m->oargs.sarg[2], 3, col); |
| 133 |
if (errno) |
| 134 |
goto computerr; |
| 135 |
if (raymixture(r, mod[0], mod[1], coef)) { |
| 136 |
if (m->omod != OVOID) |
| 137 |
objerror(m, USER, "inappropriate modifier"); |
| 138 |
return(1); |
| 139 |
} |
| 140 |
return(0); |
| 141 |
computerr: |
| 142 |
objerror(m, WARNING, "compute error"); |
| 143 |
return(0); |
| 144 |
} |
