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mx_data.c
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Created
Fri, Sep 27, 10:28
Size
3 KB
Mime Type
text/x-c
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Sun, Sep 29, 10:28 (2 d)
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blob
Format
Raw Data
Handle
21122353
Attached To
R10977 RADIANCE Photon Map
mx_data.c
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#ifndef lint
static
const
char
RCSid
[]
=
"$Id: mx_data.c,v 2.10 2014/07/08 18:25:00 greg Exp $"
;
#endif
/*
* mx_data.c - routine for stored mixtures.
*/
#include "copyright.h"
#include "ray.h"
#include "data.h"
#include "func.h"
#include "rtotypes.h"
/*
* A stored mixture is specified:
*
* modifier mixdata name
* 6+ foremod backmod func dfname vfname v0 v1 .. xf
* 0
* n A1 A2 ..
*
* A picture mixture is specified as:
*
* modifier mixpict name
* 7+ foremod backmod func pfname vfname vx vy xf
* 0
* n A1 A2 ..
*
*
* Vfname is the name of the file where the variable definitions
* can be found. The list of real arguments can be accessed by
* definitions in the file. Dfname is the data file.
* (Pfname is a picture file.)
* The dimensions of the data files and the number
* of variables must match. The func is a single argument
* function in the case of mixdata (three argument in the case
* of mixpict), which returns the corrected data value given the
* interpolated value from the file. The xf is a transformation
* to get from the original coordinates to the current coordinates.
*/
int
mx_data
(
/* interpolate mixture data */
OBJREC
*
m
,
RAY
*
r
)
{
OBJECT
obj
;
double
coef
;
double
pt
[
MAXDIM
];
DATARRAY
*
dp
;
OBJECT
mod
[
2
];
MFUNC
*
mf
;
int
i
;
if
(
m
->
oargs
.
nsargs
<
6
)
objerror
(
m
,
USER
,
"bad # arguments"
);
obj
=
objndx
(
m
);
for
(
i
=
0
;
i
<
2
;
i
++
)
if
(
!
strcmp
(
m
->
oargs
.
sarg
[
i
],
VOIDID
))
mod
[
i
]
=
OVOID
;
else
if
((
mod
[
i
]
=
lastmod
(
obj
,
m
->
oargs
.
sarg
[
i
]))
==
OVOID
)
{
sprintf
(
errmsg
,
"undefined modifier
\"
%s
\"
"
,
m
->
oargs
.
sarg
[
i
]);
objerror
(
m
,
USER
,
errmsg
);
}
dp
=
getdata
(
m
->
oargs
.
sarg
[
3
]);
i
=
(
1
<<
dp
->
nd
)
-
1
;
mf
=
getfunc
(
m
,
4
,
i
<<
5
,
0
);
setfunc
(
m
,
r
);
errno
=
0
;
for
(
i
=
0
;
i
<
dp
->
nd
;
i
++
)
{
pt
[
i
]
=
evalue
(
mf
->
ep
[
i
]);
if
(
errno
==
EDOM
||
errno
==
ERANGE
)
goto
computerr
;
}
coef
=
datavalue
(
dp
,
pt
);
errno
=
0
;
coef
=
funvalue
(
m
->
oargs
.
sarg
[
2
],
1
,
&
coef
);
if
(
errno
==
EDOM
||
errno
==
ERANGE
)
goto
computerr
;
if
(
raymixture
(
r
,
mod
[
0
],
mod
[
1
],
coef
))
{
if
(
m
->
omod
!=
OVOID
)
objerror
(
m
,
USER
,
"inappropriate modifier"
);
return
(
1
);
}
return
(
0
);
computerr:
objerror
(
m
,
WARNING
,
"compute error"
);
return
(
0
);
}
int
mx_pdata
(
/* interpolate mixture picture */
OBJREC
*
m
,
RAY
*
r
)
{
OBJECT
obj
;
double
col
[
3
],
coef
;
double
pt
[
MAXDIM
];
DATARRAY
*
dp
;
OBJECT
mod
[
2
];
MFUNC
*
mf
;
int
i
;
if
(
m
->
oargs
.
nsargs
<
7
)
objerror
(
m
,
USER
,
"bad # arguments"
);
obj
=
objndx
(
m
);
for
(
i
=
0
;
i
<
2
;
i
++
)
if
(
!
strcmp
(
m
->
oargs
.
sarg
[
i
],
VOIDID
))
mod
[
i
]
=
OVOID
;
else
if
((
mod
[
i
]
=
lastmod
(
obj
,
m
->
oargs
.
sarg
[
i
]))
==
OVOID
)
{
sprintf
(
errmsg
,
"undefined modifier
\"
%s
\"
"
,
m
->
oargs
.
sarg
[
i
]);
objerror
(
m
,
USER
,
errmsg
);
}
dp
=
getpict
(
m
->
oargs
.
sarg
[
3
]);
mf
=
getfunc
(
m
,
4
,
0x3
<<
5
,
0
);
setfunc
(
m
,
r
);
errno
=
0
;
pt
[
1
]
=
evalue
(
mf
->
ep
[
0
]);
/* y major ordering */
pt
[
0
]
=
evalue
(
mf
->
ep
[
1
]);
if
(
errno
==
EDOM
||
errno
==
ERANGE
)
goto
computerr
;
for
(
i
=
0
;
i
<
3
;
i
++
)
/* get pixel from picture */
col
[
i
]
=
datavalue
(
dp
+
i
,
pt
);
errno
=
0
;
/* evaluate function on pixel */
coef
=
funvalue
(
m
->
oargs
.
sarg
[
2
],
3
,
col
);
if
(
errno
==
EDOM
||
errno
==
ERANGE
)
goto
computerr
;
if
(
raymixture
(
r
,
mod
[
0
],
mod
[
1
],
coef
))
{
if
(
m
->
omod
!=
OVOID
)
objerror
(
m
,
USER
,
"inappropriate modifier"
);
return
(
1
);
}
return
(
0
);
computerr:
objerror
(
m
,
WARNING
,
"compute error"
);
return
(
0
);
}
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