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#ifndef lint |
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static const char RCSid[] = "$Id: p_data.c,v 2.7 2003/03/05 16:16:53 greg 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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|
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#include "copyright.h" |
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|
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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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/* |
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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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|
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|
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extern int |
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p_bdata( /* interpolate brightness data */ |
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register 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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register MFUNC *mf; |
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register int i; |
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|
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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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|
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|
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extern int |
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p_cdata( /* interpolate color data */ |
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register 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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register MFUNC *mf; |
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register int i; |
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|
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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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|
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|
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extern int |
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p_pdata( /* interpolate picture data */ |
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register 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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register MFUNC *mf; |
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register int i; |
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|
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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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|
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computerr: |
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objerror(m, WARNING, "compute error"); |
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return(0); |
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} |
