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- /****************************************************************************
- * texture.h
- *
- * This file contains defines and variables for the txt*.c files
- *
- * from Persistence of Vision Raytracer
- * Copyright 1993 Persistence of Vision Team
- *---------------------------------------------------------------------------
- * NOTICE: This source code file is provided so that users may experiment
- * with enhancements to POV-Ray and to port the software to platforms other
- * than those supported by the POV-Ray Team. There are strict rules under
- * which you are permitted to use this file. The rules are in the file
- * named POVLEGAL.DOC which should be distributed with this file. If
- * POVLEGAL.DOC is not available or for more info please contact the POV-Ray
- * Team Coordinator by leaving a message in CompuServe's Graphics Developer's
- * Forum. The latest version of POV-Ray may be found there as well.
- *
- * This program is based on the popular DKB raytracer version 2.12.
- * DKBTrace was originally written by David K. Buck.
- * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
- *
- *****************************************************************************/
-
- extern long Calls_To_Noise, Calls_To_DNoise;
-
- #define MINX -10000 /* Ridiculously large scaling values */
- #define MINY MINX
- #define MINZ MINX
-
- #define MAXSIZE 267
- #define RNDMASK 0x7FFF
- #define RNDDIVISOR (DBL) RNDMASK
- #define NUMBER_OF_WAVES 10
- #define SINTABSIZE 1000
-
- #define FLOOR(x) ((x) >= 0.0 ? floor(x) : (0.0 - floor(0.0 - (x)) - 1.0))
- #define FABS(x) ((x) < 0.0 ? (0.0 - x) : (x))
- #define SCURVE(a) ((a)*(a)*(3.0-2.0*(a)))
- #define REALSCALE ( 2.0 / 65535.0 )
- #define Hash3d(a,b,c) hashTable[(int)(hashTable[(int)(hashTable[(int)((a) & 0xfffL)] \
- ^ ((b) & 0xfffL))] ^ ((c) & 0xfffL))]
- #define Hash2d(a,b) hashTable[(int)(hashTable[(int)((a) & 0xfffL)] ^ ((b) & 0xfffL))]
- #define Hash1d(a,b) hashTable[(int)(a) ^ ((b) & 0xfffL)]
- #define INCRSUM(m,s,x,y,z) ((s)*(RTable[m]*0.5 \
- + RTable[m+1]*(x) \
- + RTable[m+2]*(y) \
- + RTable[m+3]*(z)))
-
- #define INCRSUMP(mp,s,x,y,z) ((s)*((mp[0])*0.5 + (mp[1])*(x) + (mp[2])*(y) + (mp[3])*(z)))
-
- extern int Options;
- extern DBL *sintab;
- extern DBL frequency[NUMBER_OF_WAVES];
- extern VECTOR Wave_Sources[NUMBER_OF_WAVES];
- extern DBL *RTable;
- extern short *hashTable;
- extern unsigned short crctab[256];
-