src/rt/m_direct.c

#ifndef lint
static const char       RCSid[] = "$Id: m_direct.c,v 2.17 2023/11/15 18:02:53 greg Exp $";
#endif
/*
 * Routines for light-redirecting materials and
 *   their associated virtual light sources
 */

#include "copyright.h"

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

/*
 * The arguments for MAT_DIRECT1 are:
 *
 *      5+ coef1 dx1 dy1 dz1 funcfile transform..
 *      0
 *      n A1 A2 .. An
 *
 * The arguments for MAT_DIRECT2 are:
 *
 *      9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform..
 *      0
 *      n A1 A2 .. An
 */

static int redirect(OBJREC  *m, RAY  *r, int  n);
static int dir_proj(MAT4  pm, OBJREC  *o, SRCREC  *s, int  n);

VSMATERIAL  direct1_vs = {dir_proj, 1};
VSMATERIAL  direct2_vs = {dir_proj, 2};

#define getdfunc(m)     ( (m)->otype == MAT_DIRECT1 ? \
                                getfunc(m, 4, 0xf, 1) : \
                                getfunc(m, 8, 0xff, 1) )


int
m_direct(                       /* shade redirected ray */
        OBJREC  *m,
        RAY  *r
)
{
                                        /* check if source ray */
        if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
                return(1);                      /* got the wrong guy */
                                        /* compute first projection */
        if (m->otype == MAT_DIRECT1 ||
                        (r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 0))
                redirect(m, r, 0);
                                        /* compute second projection */
        if (m->otype == MAT_DIRECT2 &&
                        (r->rsrc < 0 || source[r->rsrc].sa.sv.pn == 1))
                redirect(m, r, 1);
        return(1);
}


static int
redirect(               /* compute n'th ray redirection */
        OBJREC  *m,
        RAY  *r,
        int  n
)
{
        MFUNC  *mf;
        EPNODE  **va;
        FVECT  nsdir;
        RAY  nr;
        double  coef;
        int  j;
                                        /* set up function */
        mf = getdfunc(m);
        setfunc(m, r);
                                        /* assign direction variable */
        if (r->rsrc >= 0) {
                SRCREC  *sp = source + source[r->rsrc].sa.sv.sn;

                if (sp->sflags & SDISTANT)
                        VCOPY(nsdir, sp->sloc);
                else {
                        for (j = 0; j < 3; j++)
                                nsdir[j] = sp->sloc[j] - r->rop[j];
                        normalize(nsdir);
                }
                multv3(nsdir, nsdir, funcxf.xfm);
                varset("DxA", '=', nsdir[0]/funcxf.sca);
                varset("DyA", '=', nsdir[1]/funcxf.sca);
                varset("DzA", '=', nsdir[2]/funcxf.sca);
        } else {
                varset("DxA", '=', 0.0);
                varset("DyA", '=', 0.0);
                varset("DzA", '=', 0.0);
        }
                                        /* compute coefficient */
        errno = 0;
        va = mf->ep + 4*n;
        coef = evalue(va[0]);
        if ((errno == EDOM) | (errno == ERANGE))
                goto computerr;
        setscolor(nr.rcoef, coef, coef, coef);
        if (rayorigin(&nr, TRANS, r, nr.rcoef) < 0)
                return(0);
        va++;                           /* compute direction */
        for (j = 0; j < 3; j++) {
                nr.rdir[j] = evalue(va[j]);
                if ((errno == EDOM) | (errno == ERANGE))
                        goto computerr;
        }
        if (mf->fxp != &unitxf)
                multv3(nr.rdir, nr.rdir, mf->fxp->xfm);
        if (r->rox != NULL)
                multv3(nr.rdir, nr.rdir, r->rox->f.xfm);
        if (normalize(nr.rdir) == 0.0)
                goto computerr;
                                        /* compute value */
        if (r->rsrc >= 0)
                nr.rsrc = source[r->rsrc].sa.sv.sn;
        rayvalue(&nr);
        smultscolor(nr.rcol, nr.rcoef);
        saddscolor(r->rcol, nr.rcol);
        if (r->ro != NULL && isflat(r->ro->otype))
                r->rxt = r->rot + raydistance(&nr);
        return(1);
computerr:
        objerror(m, WARNING, "compute error");
        return(-1);
}


static int
dir_proj(               /* compute a director's projection */
        MAT4  pm,
        OBJREC  *o,
        SRCREC  *s,
        int  n
)
{
        RAY  tr;
        OBJREC  *m;
        MFUNC  *mf;
        EPNODE  **va;
        FVECT  cent, newdir, nv, h;
        double  coef, olddot, newdot, od;
        int  i, j;
                                /* initialize test ray */
        getmaxdisk(cent, o);
        if (s->sflags & SDISTANT)
                for (i = 0; i < 3; i++) {
                        tr.rdir[i] = -s->sloc[i];
                        tr.rorg[i] = cent[i] - tr.rdir[i];
                }
        else {
                for (i = 0; i < 3; i++) {
                        tr.rdir[i] = cent[i] - s->sloc[i];
                        tr.rorg[i] = s->sloc[i];
                }
                if (normalize(tr.rdir) == 0.0)
                        return(0);              /* at source! */
        }
        od = getplaneq(nv, o);
        olddot = DOT(tr.rdir, nv);
        if (olddot <= FTINY && olddot >= -FTINY)
                return(0);              /* old dir parallels plane */
        tr.rmax = 0.0;
        rayorigin(&tr, PRIMARY, NULL, NULL);
        if (!(*ofun[o->otype].funp)(o, &tr))
                return(0);              /* no intersection! */
                                /* compute redirection */
        m = vsmaterial(o);
        mf = getdfunc(m);
        setfunc(m, &tr);
        varset("DxA", '=', 0.0);
        varset("DyA", '=', 0.0);
        varset("DzA", '=', 0.0);
        errno = 0;
        va = mf->ep + 4*n;
        coef = evalue(va[0]);
        if ((errno == EDOM) | (errno == ERANGE))
                goto computerr;
        if (coef <= FTINY)
                return(0);              /* insignificant */
        va++;
        for (i = 0; i < 3; i++) {
                newdir[i] = evalue(va[i]);
                if ((errno == EDOM) | (errno == ERANGE))
                        goto computerr;
        }
        if (mf->fxp != &unitxf)
                multv3(newdir, newdir, mf->fxp->xfm);
                                        /* normalization unnecessary */
        newdot = DOT(newdir, nv);
        if (newdot <= FTINY && newdot >= -FTINY)
                return(0);              /* new dir parallels plane */
                                /* everything OK -- compute shear */
        for (i = 0; i < 3; i++)
                h[i] = newdir[i]/newdot - tr.rdir[i]/olddot;
        setident4(pm);
        for (j = 0; j < 3; j++) {
                for (i = 0; i < 3; i++)
                        pm[i][j] += nv[i]*h[j];
                pm[3][j] = -od*h[j];
        }
        if ((newdot > 0.0) ^ (olddot > 0.0))    /* add mirroring */
                for (j = 0; j < 3; j++) {
                        for (i = 0; i < 3; i++)
                                pm[i][j] -= 2.*nv[i]*nv[j];
                        pm[3][j] += 2.*od*nv[j];
                }
        return(1);
computerr:
        objerror(m, WARNING, "projection compute error");
        return(0);
}
Revision:	2.18
Committed:	Tue Dec 3 19:36:58 2024 UTC (11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad6R0, HEAD
Changes since 2.17:	+4 -4 lines
Log Message:	perf: Minor conditional optimizations
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.18	static const char RCSid[] = "$Id: m_direct.c,v 2.17 2023/11/15 18:02:53 greg Exp $";
3	greg	1.1	#endif
4			/*
5			* Routines for light-redirecting materials and
6			* their associated virtual light sources
7			*/
8
9	greg	2.9	#include "copyright.h"
10	greg	2.8
11	greg	1.1	#include "ray.h"
12			#include "otypes.h"
13	schorsch	2.12	#include "rtotypes.h"
14	greg	1.1	#include "source.h"
15	greg	2.2	#include "func.h"
16
17	greg	1.1	/*
18			* The arguments for MAT_DIRECT1 are:
19			*
20	greg	1.3	* 5+ coef1 dx1 dy1 dz1 funcfile transform..
21	greg	1.1	* 0
22			* n A1 A2 .. An
23			*
24			* The arguments for MAT_DIRECT2 are:
25			*
26	greg	1.3	* 9+ coef1 dx1 dy1 dz1 coef2 dx2 dy2 dz2 funcfile transform..
27	greg	1.1	* 0
28			* n A1 A2 .. An
29			*/
30
31	schorsch	2.12	static int redirect(OBJREC m, RAY r, int n);
32			static int dir_proj(MAT4 pm, OBJREC o, SRCREC s, int n);
33	greg	2.8
34	greg	1.1	VSMATERIAL direct1_vs = {dir_proj, 1};
35			VSMATERIAL direct2_vs = {dir_proj, 2};
36
37	greg	2.2	#define getdfunc(m) ( (m)->otype == MAT_DIRECT1 ? \
38			getfunc(m, 4, 0xf, 1) : \
39			getfunc(m, 8, 0xff, 1) )
40	greg	1.1
41	greg	1.6
42	greg	2.15	int
43	schorsch	2.12	m_direct( /* shade redirected ray */
44	greg	2.15	OBJREC *m,
45			RAY *r
46	schorsch	2.12	)
47	greg	1.1	{
48			/* check if source ray */
49			if (r->rsrc >= 0 && source[r->rsrc].so != r->ro)
50	greg	2.4	return(1); /* got the wrong guy */
51	greg	1.1	/* compute first projection */
52			if (m->otype == MAT_DIRECT1 \|\|
53			(r->rsrc < 0 \|\| source[r->rsrc].sa.sv.pn == 0))
54			redirect(m, r, 0);
55			/* compute second projection */
56			if (m->otype == MAT_DIRECT2 &&
57			(r->rsrc < 0 \|\| source[r->rsrc].sa.sv.pn == 1))
58			redirect(m, r, 1);
59	greg	2.4	return(1);
60	greg	1.1	}
61
62
63	schorsch	2.12	static int
64			redirect( /* compute n'th ray redirection */
65			OBJREC *m,
66			RAY *r,
67			int n
68			)
69	greg	1.1	{
70	greg	2.2	MFUNC *mf;
71	greg	2.15	EPNODE **va;
72	greg	2.3	FVECT nsdir;
73	greg	1.1	RAY nr;
74			double coef;
75	greg	2.15	int j;
76	greg	1.1	/* set up function */
77	greg	2.2	mf = getdfunc(m);
78			setfunc(m, r);
79	greg	2.3	/* assign direction variable */
80			if (r->rsrc >= 0) {
81	greg	2.15	SRCREC *sp = source + source[r->rsrc].sa.sv.sn;
82	greg	2.3
83			if (sp->sflags & SDISTANT)
84			VCOPY(nsdir, sp->sloc);
85			else {
86			for (j = 0; j < 3; j++)
87			nsdir[j] = sp->sloc[j] - r->rop[j];
88			normalize(nsdir);
89			}
90	greg	2.6	multv3(nsdir, nsdir, funcxf.xfm);
91			varset("DxA", '=', nsdir[0]/funcxf.sca);
92			varset("DyA", '=', nsdir[1]/funcxf.sca);
93			varset("DzA", '=', nsdir[2]/funcxf.sca);
94			} else {
95			varset("DxA", '=', 0.0);
96			varset("DyA", '=', 0.0);
97			varset("DzA", '=', 0.0);
98			}
99	greg	1.1	/* compute coefficient */
100			errno = 0;
101	greg	2.2	va = mf->ep + 4*n;
102			coef = evalue(va[0]);
103	greg	2.13	if ((errno == EDOM) \| (errno == ERANGE))
104	greg	1.1	goto computerr;
105	greg	2.17	setscolor(nr.rcoef, coef, coef, coef);
106	greg	2.13	if (rayorigin(&nr, TRANS, r, nr.rcoef) < 0)
107	greg	1.1	return(0);
108	greg	2.2	va++; /* compute direction */
109			for (j = 0; j < 3; j++) {
110			nr.rdir[j] = evalue(va[j]);
111	greg	2.18	if ((errno == EDOM) \| (errno == ERANGE))
112	greg	2.2	goto computerr;
113			}
114	greg	2.14	if (mf->fxp != &unitxf)
115			multv3(nr.rdir, nr.rdir, mf->fxp->xfm);
116	greg	1.4	if (r->rox != NULL)
117			multv3(nr.rdir, nr.rdir, r->rox->f.xfm);
118			if (normalize(nr.rdir) == 0.0)
119			goto computerr;
120	greg	1.1	/* compute value */
121			if (r->rsrc >= 0)
122			nr.rsrc = source[r->rsrc].sa.sv.sn;
123			rayvalue(&nr);
124	greg	2.17	smultscolor(nr.rcol, nr.rcoef);
125			saddscolor(r->rcol, nr.rcol);
126	greg	2.7	if (r->ro != NULL && isflat(r->ro->otype))
127	greg	2.16	r->rxt = r->rot + raydistance(&nr);
128	greg	1.1	return(1);
129			computerr:
130			objerror(m, WARNING, "compute error");
131			return(-1);
132			}
133
134
135	greg	2.8	static int
136	schorsch	2.12	dir_proj( /* compute a director's projection */
137			MAT4 pm,
138			OBJREC *o,
139			SRCREC *s,
140			int n
141			)
142	greg	1.1	{
143			RAY tr;
144	greg	2.2	OBJREC *m;
145			MFUNC *mf;
146			EPNODE **va;
147	greg	1.1	FVECT cent, newdir, nv, h;
148	greg	2.2	double coef, olddot, newdot, od;
149	greg	2.15	int i, j;
150	greg	1.1	/* initialize test ray */
151			getmaxdisk(cent, o);
152			if (s->sflags & SDISTANT)
153			for (i = 0; i < 3; i++) {
154			tr.rdir[i] = -s->sloc[i];
155			tr.rorg[i] = cent[i] - tr.rdir[i];
156			}
157			else {
158			for (i = 0; i < 3; i++) {
159			tr.rdir[i] = cent[i] - s->sloc[i];
160	greg	1.2	tr.rorg[i] = s->sloc[i];
161	greg	1.1	}
162			if (normalize(tr.rdir) == 0.0)
163			return(0); /* at source! */
164			}
165			od = getplaneq(nv, o);
166			olddot = DOT(tr.rdir, nv);
167			if (olddot <= FTINY && olddot >= -FTINY)
168			return(0); /* old dir parallels plane */
169	greg	2.5	tr.rmax = 0.0;
170	greg	2.13	rayorigin(&tr, PRIMARY, NULL, NULL);
171	greg	1.1	if (!(*ofun[o->otype].funp)(o, &tr))
172			return(0); /* no intersection! */
173			/* compute redirection */
174	greg	2.2	m = vsmaterial(o);
175			mf = getdfunc(m);
176			setfunc(m, &tr);
177	greg	2.3	varset("DxA", '=', 0.0);
178			varset("DyA", '=', 0.0);
179			varset("DzA", '=', 0.0);
180	greg	1.1	errno = 0;
181	greg	2.2	va = mf->ep + 4*n;
182			coef = evalue(va[0]);
183	greg	2.18	if ((errno == EDOM) \| (errno == ERANGE))
184	greg	1.1	goto computerr;
185	greg	2.2	if (coef <= FTINY)
186			return(0); /* insignificant */
187			va++;
188			for (i = 0; i < 3; i++) {
189			newdir[i] = evalue(va[i]);
190	greg	2.18	if ((errno == EDOM) \| (errno == ERANGE))
191	greg	2.2	goto computerr;
192			}
193	greg	2.14	if (mf->fxp != &unitxf)
194			multv3(newdir, newdir, mf->fxp->xfm);
195	greg	1.4	/* normalization unnecessary */
196	greg	1.1	newdot = DOT(newdir, nv);
197			if (newdot <= FTINY && newdot >= -FTINY)
198			return(0); /* new dir parallels plane */
199			/* everything OK -- compute shear */
200			for (i = 0; i < 3; i++)
201	greg	1.4	h[i] = newdir[i]/newdot - tr.rdir[i]/olddot;
202	greg	1.1	setident4(pm);
203			for (j = 0; j < 3; j++) {
204			for (i = 0; i < 3; i++)
205			pm[i][j] += nv[i]*h[j];
206			pm[3][j] = -od*h[j];
207			}
208	schorsch	2.11	if ((newdot > 0.0) ^ (olddot > 0.0)) /* add mirroring */
209	greg	1.1	for (j = 0; j < 3; j++) {
210			for (i = 0; i < 3; i++)
211			pm[i][j] -= 2.nv[i]nv[j];
212			pm[3][j] += 2.odnv[j];
213			}
214			return(1);
215			computerr:
216			objerror(m, WARNING, "projection compute error");
217			return(0);
218			}