[ViewVC] Diff of: radiance/src/common/dircode.c

Comparing src/common/dircode.c (file contents):
Revision 2.8 by greg, Fri Nov 9 01:35:00 2012 UTC vs.
Revision 2.9 by greg, Tue May 14 17:21:50 2019 UTC

#	Line 50 \| Line 50 \| *encodedir(FVECT dv) / encode a normalized direction**
50		return(dc);
51		}
52
53	+	#if 0 /* original version for reference */
54
55		void
56		decodedir(FVECT dv, int32 dc) /* decode a normalized direction vector */
#	Line 77 \| Line 78 \| *decodedir(FVECT dv, int32 dc) / decode a normalized d**
78		if (dc & FZNEG) dv[2] = -dv[2];
79		}
80
81	+	#else
82
83	+	void
84	+	decodedir(FVECT dv, int32 dc) /* decode a normalized direction vector */
85	+	{
86	+	static const short itab[4][3] = {
87	+	{1,0,2},{0,1,2},{1,2,0},{0,2,1}
88	+	};
89	+	static const RREAL neg[2] = {1., -1.};
90	+	const int ndx = ((dc & F2Z) != 0)<<1 \| ((dc & F1X) != 0);
91	+	double d1, d2, der;
92	+
93	+	if (!dc) { /* special code for zero normal */
94	+	dv[0] = dv[1] = dv[2] = 0.;
95	+	return;
96	+	}
97	+	d1 = ((dc>>F1SFT & FMASK)+.5)*(1./DCSCALE);
98	+	d2 = ((dc>>F2SFT & FMASK)+.5)*(1./DCSCALE);
99	+	der = sqrt(1. - d1d1 - d2d2);
100	+	dv[itab[ndx][0]] = d1;
101	+	dv[itab[ndx][1]] = d2;
102	+	dv[itab[ndx][2]] = der;
103	+	dv[0] *= neg[(dc&FXNEG)!=0];
104	+	dv[1] *= neg[(dc&FYNEG)!=0];
105	+	dv[2] *= neg[(dc&FZNEG)!=0];
106	+	}
107	+
108	+	#endif
109	+
110		double
111		dir2diff(int32 dc1, int32 dc2) /* approx. radians^2 between directions */
112		{
#	Line 88 \| Line 117 \| *dir2diff(int32 dc1, int32 dc2) / approx. radians^2 be**
117
118		return(2. - 2.*DOT(v1,v2));
119		}
91	–
120
121		double
122		fdir2diff(int32 dc1, FVECT v2) /* approx. radians^2 between directions */

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