RadiancePmap/p_func.c
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p_func.c
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			#ifndef lint
			static const char RCSid[] = "$Id: p_func.c,v 2.8 2014/07/08 18:25:00 greg Exp $";
			#endif
			/*
			* p_func.c - routine for procedural patterns.
			*/

			#include "copyright.h"

			#include "ray.h"
			#include "func.h"
			#include "rtotypes.h"

			/*
			* A procedural pattern can either be a brightness or a
			* color function. A brightness function is given as:
			*
			* modifier brightfunc name
			* 2+ bvarname filename xf
			* 0
			* n A1 A2 ..
			*
			* A color function is given as:
			*
			* modifier colorfunc name
			* 4+ rvarname gvarname bvarname filename xf
			* 0
			* n A1 A2 ..
			*
			* Filename 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. The xf is a transformation
			* to get from the original coordinates to the current coordinates.
			*/


			int
			p_bfunc( /* compute brightness pattern */
			OBJREC *m,
			RAY *r
			)
			{
			double bval;
			MFUNC *mf;

			if (m->oargs.nsargs < 2)
			objerror(m, USER, "bad # arguments");
			mf = getfunc(m, 1, 0x1, 0);
			setfunc(m, r);
			errno = 0;
			bval = evalue(mf->ep[0]);
			if (errno == EDOM \|\| errno == ERANGE) {
			objerror(m, WARNING, "compute error");
			return(0);
			}
			scalecolor(r->pcol, bval);
			return(0);
			}


			int
			p_cfunc( /* compute color pattern */
			OBJREC *m,
			RAY *r
			)
			{
			COLOR cval;
			MFUNC *mf;

			if (m->oargs.nsargs < 4)
			objerror(m, USER, "bad # arguments");
			mf = getfunc(m, 3, 0x7, 0);
			setfunc(m, r);
			errno = 0;
			setcolor(cval, evalue(mf->ep[0]),
			evalue(mf->ep[1]),
			evalue(mf->ep[2]));
			if (errno == EDOM \|\| errno == ERANGE) {
			objerror(m, WARNING, "compute error");
			return(0);
			}
			multcolor(r->pcol, cval);
			return(0);
			}