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#ifndef lint
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static const char RCSid[] = "$Id: p_data.c,v 2.8 2004/03/30 16:13:01 schorsch Exp $";
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#endif
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/*
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* p_data.c - routine for stored patterns.
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*/
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#include "copyright.h"
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#include "ray.h"
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#include "data.h"
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#include "func.h"
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#include "rtotypes.h"
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/*
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* A stored pattern can either be brightness or
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* color data. Brightness data is specified as:
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*
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* modifier brightdata name
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* 4+ func dfname vfname v0 v1 .. xf
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* 0
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* n A1 A2 ..
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*
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* Color data is specified as:
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*
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* modifier colordata name
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* 8+ rfunc gfunc bfunc rdfname gdfname bdfname vfname v0 v1 .. xf
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* 0
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* n A1 A2 ..
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*
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* Color picture data is specified as:
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*
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* modifier colorpict name
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* 7+ rfunc gfunc bfunc pfname vfname vx vy xf
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* 0
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* n A1 A2 ..
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*
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* Vfname is the name of the file where the variable definitions
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* can be found. The list of real arguments can be accessed by
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* definitions in the file. The dfnames are the data file
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* names. The dimensions of the data files and the number
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* of variables must match. The funcs take a single argument
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* for brightdata, and three for colordata and colorpict to produce
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* interpolated values from the file. The xf is a transformation
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* to get from the original coordinates to the current coordinates.
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*/
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int
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p_bdata( /* interpolate brightness data */
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OBJREC *m,
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RAY *r
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)
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{
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double bval;
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double pt[MAXDIM];
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DATARRAY *dp;
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MFUNC *mf;
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int i;
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if (m->oargs.nsargs < 4)
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objerror(m, USER, "bad # arguments");
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dp = getdata(m->oargs.sarg[1]);
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i = (1 << dp->nd) - 1;
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mf = getfunc(m, 2, i<<3, 0);
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setfunc(m, r);
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errno = 0;
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for (i = dp->nd; i-- > 0; ) {
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pt[i] = evalue(mf->ep[i]);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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}
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bval = datavalue(dp, pt);
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errno = 0;
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bval = funvalue(m->oargs.sarg[0], 1, &bval);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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scalecolor(r->pcol, bval);
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return(0);
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computerr:
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objerror(m, WARNING, "compute error");
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return(0);
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}
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int
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p_cdata( /* interpolate color data */
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OBJREC *m,
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RAY *r
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)
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{
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double col[3];
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COLOR cval;
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double pt[MAXDIM];
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int nv;
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DATARRAY *dp;
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MFUNC *mf;
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int i;
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if (m->oargs.nsargs < 8)
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objerror(m, USER, "bad # arguments");
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dp = getdata(m->oargs.sarg[3]);
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i = (1 << (nv = dp->nd)) - 1;
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mf = getfunc(m, 6, i<<7, 0);
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setfunc(m, r);
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errno = 0;
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for (i = 0; i < nv; i++) {
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pt[i] = evalue(mf->ep[i]);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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}
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col[0] = datavalue(dp, pt);
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for (i = 1; i < 3; i++) {
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dp = getdata(m->oargs.sarg[i+3]);
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if (dp->nd != nv)
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objerror(m, USER, "dimension error");
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col[i] = datavalue(dp, pt);
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}
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errno = 0;
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for (i = 0; i < 3; i++)
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if (fundefined(m->oargs.sarg[i]) < 3)
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colval(cval,i) = funvalue(m->oargs.sarg[i], 1, col+i);
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else
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colval(cval,i) = funvalue(m->oargs.sarg[i], 3, col);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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multcolor(r->pcol, cval);
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return(0);
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computerr:
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objerror(m, WARNING, "compute error");
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return(0);
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}
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int
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p_pdata( /* interpolate picture data */
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OBJREC *m,
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RAY *r
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)
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{
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double col[3];
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COLOR cval;
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double pt[2];
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DATARRAY *dp;
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MFUNC *mf;
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int i;
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if (m->oargs.nsargs < 7)
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objerror(m, USER, "bad # arguments");
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mf = getfunc(m, 4, 0x3<<5, 0);
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setfunc(m, r);
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errno = 0;
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pt[1] = evalue(mf->ep[0]); /* y major ordering */
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pt[0] = evalue(mf->ep[1]);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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dp = getpict(m->oargs.sarg[3]);
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for (i = 0; i < 3; i++)
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col[i] = datavalue(dp+i, pt);
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errno = 0;
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for (i = 0; i < 3; i++)
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if (fundefined(m->oargs.sarg[i]) < 3)
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colval(cval,i) = funvalue(m->oargs.sarg[i], 1, col+i);
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else
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colval(cval,i) = funvalue(m->oargs.sarg[i], 3, col);
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if (errno == EDOM || errno == ERANGE)
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goto computerr;
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multcolor(r->pcol, cval);
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return(0);
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computerr:
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objerror(m, WARNING, "compute error");
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return(0);
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}
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