gfx/povray/point.h

   1 /****************************************************************************
   2 *                   point.h
   3 *
   4 *  This module contains all defines, typedefs, and prototypes for POINT.C.
   5 *
   6 *  from Persistence of Vision(tm) Ray Tracer
   7 *  Copyright 1996,1999 Persistence of Vision Team
   8 *---------------------------------------------------------------------------
   9 *  NOTICE: This source code file is provided so that users may experiment
  10 *  with enhancements to POV-Ray and to port the software to platforms other
  11 *  than those supported by the POV-Ray Team.  There are strict rules under
  12 *  which you are permitted to use this file.  The rules are in the file
  13 *  named POVLEGAL.DOC which should be distributed with this file.
  14 *  If POVLEGAL.DOC is not available or for more info please contact the POV-Ray
  15 *  Team Coordinator by email to team-coord@povray.org or visit us on the web at
  16 *  http://www.povray.org. The latest version of POV-Ray may be found at this site.
  17 *
  18 * This program is based on the popular DKB raytracer version 2.12.
  19 * DKBTrace was originally written by David K. Buck.
  20 * DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
  21 *
  22 *****************************************************************************/
  23
  24
  25 #ifndef POINT_H
  26 #define POINT_H
  27
  28 #include "vlbuffer.h"
  29
  30
  31
  32 /*****************************************************************************
  33 * Global preprocessor defines
  34 ******************************************************************************/
  35
  36 #define LIGHT_OBJECT (COMPOUND_OBJECT+PATCH_OBJECT+LIGHT_SOURCE_OBJECT)
  37
  38
  39
  40 /* Light source types. */
  41
  42 #define POINT_SOURCE       1
  43 #define SPOT_SOURCE        2
  44 #define FILL_LIGHT_SOURCE  3
  45 #define CYLINDER_SOURCE    4
  46
  47
  48
  49 /*****************************************************************************
  50 * Global typedefs
  51 ******************************************************************************/
  52
  53 typedef struct Light_Source_Struct LIGHT_SOURCE;
  54
  55 struct Light_Source_Struct
  56 {
  57   COMPOUND_FIELDS
  58   COLOUR Colour;
  59   VECTOR Direction, Center, Points_At, Axis1, Axis2;
  60   DBL Coeff, Radius, Falloff;
  61   DBL Fade_Distance, Fade_Power;
  62   LIGHT_SOURCE *Next_Light_Source;
  63   unsigned char Light_Type, Area_Light, Jitter, Track;
  64   int Area_Size1, Area_Size2;
  65   int Adaptive_Level;
  66   int Media_Attenuation;
  67   int Media_Interaction;
  68   COLOUR **Light_Grid;
  69   OBJECT *Shadow_Cached_Object;
  70
  71   /* Light buffers for the six general directions in space. [DB 9/94] */
  72
  73   PROJECT_TREE_NODE *Light_Buffer[6];
  74 };
  75
  76
  77
  78
  79 /*****************************************************************************
  80 * Global variables
  81 ******************************************************************************/
  82
  83
  84
  85
  86 /*****************************************************************************
  87 * Global functions
  88 ******************************************************************************/
  89
  90 LIGHT_SOURCE *Create_Light_Source (void);
  91 DBL Attenuate_Light (LIGHT_SOURCE *Light_Source, RAY *Light_Source_Ray, DBL Distance);
  92 COLOUR **Create_Light_Grid (int Size1, int Size2);
  93
  94
  95
  96 #endif