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- /*****************************************************************************
- *
- * objects.c
- *
- * from DKBTrace (c) 1990 David Buck
- *
- * This module implements the methods for objects and composite objects.
- *
- * This software is freely distributable. The source and/or object code may be
- * copied or uploaded to communications services so long as this notice remains
- * at the top of each file. If any changes are made to the program, you must
- * clearly indicate in the documentation and in the programs startup message
- * who it was who made the changes. The documentation should also describe what
- * those changes were. This software may not be included in whole or in
- * part into any commercial package without the express written consent of the
- * author. It may, however, be included in other public domain or freely
- * distributed software so long as the proper credit for the software is given.
- *
- * This software is provided as is without any guarantees or warranty. Although
- * the author has attempted to find and correct any bugs in the software, he
- * is not responsible for any damage caused by the use of the software. The
- * author is under no obligation to provide service, corrections, or upgrades
- * to this package.
- *
- * Despite all the legal stuff above, if you do find bugs, I would like to hear
- * about them. Also, if you have any comments or questions, you may contact me
- * at the following address:
- *
- * David Buck
- * 22C Sonnet Cres.
- * Nepean Ontario
- * Canada, K2H 8W7
- *
- * I can also be reached on the following bulleton boards:
- *
- * OMX (613) 731-3419
- * Mystic (613) 596-4249 or (613) 596-4772
- *
- * Fidonet: 1:163/109.9
- * Internet: dbuck@ccs.carleton.ca
- * The "You Can Call Me RAY" BBS (708) 358-5611
- *
- * IBM Port by Aaron A. Collins. Aaron may be reached on the following BBS'es:
- *
- * The "You Can Call Me RAY" BBS (708) 358-5611
- * The Information Exchange BBS (708) 945-5575
- *
- *****************************************************************************/
-
-
- #include "frame.h"
- #include "vector.h"
- #include "dkbproto.h"
-
- extern RAY *VP_Ray;
- extern long Bounding_Region_Tests, Bounding_Region_Tests_Succeeded;
-
- METHODS Composite_Methods =
- { Object_Intersect, All_Composite_Intersections,
- Inside_Composite_Object, NULL,
- Copy_Composite_Object,
- Translate_Composite_Object, Rotate_Composite_Object,
- Scale_Composite_Object, Invert_Composite_Object};
-
- METHODS Basic_Object_Methods =
- { Object_Intersect, All_Object_Intersections,
- Inside_Basic_Object, NULL,
- Copy_Basic_Object,
- Translate_Basic_Object, Rotate_Basic_Object,
- Scale_Basic_Object, Invert_Basic_Object};
-
-
- INTERSECTION *Object_Intersect (Object, Ray)
- OBJECT *Object;
- RAY *Ray;
- {
- INTERSECTION *Local_Intersection, *Queue_Element;
- PRIOQ *Depth_Queue;
-
- Depth_Queue = pq_new (128);
-
- if ((All_Intersections (Object, Ray, Depth_Queue))
- && ((Queue_Element = pq_get_highest (Depth_Queue)) != NULL))
- {
- if ((Local_Intersection = (INTERSECTION *) malloc(sizeof(INTERSECTION)))
- == NULL) {
- PRINT("Cannot allocate memory for local intersection\n");
- return (NULL);
- }
- Local_Intersection->Point = Queue_Element->Point;
- Local_Intersection->Shape = Queue_Element->Shape;
- Local_Intersection->Depth = Queue_Element->Depth;
- Local_Intersection->Object = Queue_Element->Object;
- pq_free (Depth_Queue);
- return (Local_Intersection);
- }
- else
- {
- pq_free (Depth_Queue);
- return (NULL);
- }
- }
-
- int All_Composite_Intersections (Object, Ray, Depth_Queue)
- OBJECT *Object;
- RAY *Ray;
- PRIOQ *Depth_Queue;
- {
- register int Intersection_Found;
- SHAPE *Bounding_Shape;
- INTERSECTION *Local_Intersection;
- OBJECT *Local_Object;
-
- for (Bounding_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Bounding_Shape != NULL ;
- Bounding_Shape = Bounding_Shape -> Next_Object) {
-
- Bounding_Region_Tests++;
- if ((Local_Intersection = Intersection ((OBJECT *) Bounding_Shape, Ray)) != NULL)
- free (Local_Intersection);
- else
- if (!Inside (&Ray -> Initial, (OBJECT *) Bounding_Shape))
- return (FALSE);
- Bounding_Region_Tests_Succeeded++;
- }
-
- Intersection_Found = FALSE;
- for (Local_Object = ((COMPOSITE *) Object) -> Objects ;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- if (All_Intersections (Local_Object, Ray, Depth_Queue))
- Intersection_Found = TRUE;
-
- return (Intersection_Found);
- }
-
- int All_Object_Intersections (Object, Ray, Depth_Queue)
- OBJECT *Object;
- RAY *Ray;
- PRIOQ *Depth_Queue;
- {
- INTERSECTION *Local_Intersection;
- SHAPE *Bounding_Shape;
-
- for (Bounding_Shape = Object -> Bounding_Shapes ;
- Bounding_Shape != NULL ;
- Bounding_Shape = Bounding_Shape -> Next_Object) {
-
- Bounding_Region_Tests++;
- if ((Local_Intersection = Intersection ((OBJECT *) Bounding_Shape, Ray)) != NULL)
- free (Local_Intersection);
- else
- if (!Inside (&Ray -> Initial, (OBJECT *) Bounding_Shape))
- return (FALSE);
- Bounding_Region_Tests_Succeeded++;
- }
-
- All_Intersections ((OBJECT *)Object->Shape, Ray, Depth_Queue);
-
- if (pq_is_empty (Depth_Queue))
- return (FALSE);
- return (TRUE);
- }
-
-
- int Inside_Basic_Object (Test_Point, Object)
- VECTOR *Test_Point;
- OBJECT *Object;
- {
- SHAPE *Bounding_Shape;
-
- for (Bounding_Shape = Object -> Bounding_Shapes ;
- Bounding_Shape != NULL ;
- Bounding_Shape = Bounding_Shape -> Next_Object)
-
- if (!Inside (Test_Point, (OBJECT *) Bounding_Shape))
- return (FALSE);
-
- if (Inside (Test_Point, (OBJECT *) Object -> Shape))
- return (TRUE);
- return (FALSE);
- }
-
- int Inside_Composite_Object (Test_Point, Object)
- VECTOR *Test_Point;
- OBJECT *Object;
- {
- SHAPE *Bounding_Shape;
- OBJECT *Local_Object;
-
- for (Bounding_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Bounding_Shape != NULL ;
- Bounding_Shape = Bounding_Shape -> Next_Object)
-
- if (!Inside (Test_Point, (OBJECT *) Bounding_Shape))
- return (FALSE);
-
- for (Local_Object = ((COMPOSITE *) Object) -> Objects ;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- if (Inside (Test_Point, Local_Object))
- return (TRUE);
-
- return (FALSE);
- }
-
- void *Copy_Basic_Object (Object)
- OBJECT *Object;
- {
- SHAPE *Local_Shape, *Copied_Shape;
- OBJECT *New_Object;
-
- New_Object = Get_Object();
- *New_Object = *Object;
- New_Object -> Next_Object = NULL;
- New_Object -> Bounding_Shapes = NULL;
- for (Local_Shape = Object -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object) {
-
- Copied_Shape = (SHAPE *) Copy((OBJECT *) Local_Shape);
- Link ((OBJECT *) Copied_Shape,
- (OBJECT **) &(Copied_Shape -> Next_Object),
- (OBJECT **) &(New_Object -> Bounding_Shapes));
-
- if ((Copied_Shape->Type == CSG_UNION_TYPE)
- || (Copied_Shape->Type == CSG_INTERSECTION_TYPE)
- || (Copied_Shape->Type == CSG_DIFFERENCE_TYPE))
- Set_CSG_Parents ((CSG_SHAPE *) Copied_Shape, New_Object);
- }
-
- New_Object -> Shape = (SHAPE *) Copy((OBJECT *) Object -> Shape);
- if ((New_Object->Shape->Type == CSG_UNION_TYPE)
- || (New_Object->Shape->Type == CSG_INTERSECTION_TYPE)
- || (New_Object->Shape->Type == CSG_DIFFERENCE_TYPE))
- Set_CSG_Parents ((CSG_SHAPE *) New_Object->Shape, New_Object);
- else
- New_Object->Shape->Parent_Object = New_Object;
-
-
- if (New_Object->Object_Texture != NULL)
- New_Object->Object_Texture = Copy_Texture (New_Object->Object_Texture);
-
- return (New_Object);
- }
-
- void *Copy_Composite_Object (Object)
- OBJECT *Object;
- {
- COMPOSITE *New_Object;
- SHAPE *Local_Shape;
- OBJECT *Local_Object, *Copied_Object;
-
- New_Object = Get_Composite_Object();
- *New_Object = *((COMPOSITE *) Object);
- New_Object -> Next_Object = NULL;
- New_Object -> Objects = NULL;
- for (Local_Object = ((COMPOSITE *) Object) -> Objects;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object) {
-
- Copied_Object = (OBJECT *) Copy(Local_Object);
- Link (Copied_Object,
- &(Copied_Object -> Next_Object),
- &(New_Object -> Objects));
- }
-
- New_Object -> Bounding_Shapes = NULL;
- for (Local_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object) {
-
- Copied_Object = (OBJECT *) Copy((OBJECT *) Local_Shape);
- Link (Copied_Object,
- &(Copied_Object -> Next_Object),
- (OBJECT **) &(New_Object -> Bounding_Shapes));
- }
- return (New_Object);
- }
-
- void Translate_Basic_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- SHAPE *Local_Shape;
-
- for (Local_Shape = Object -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Translate ((OBJECT *) Local_Shape, Vector);
-
- Translate ((OBJECT *) Object -> Shape, Vector);
-
- VAdd (Object -> Object_Center, Object -> Object_Center, *Vector);
-
- Translate_Texture (&Object->Object_Texture, Vector);
- }
-
- void Rotate_Basic_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- SHAPE *Local_Shape;
- TRANSFORMATION Transformation;
-
- for (Local_Shape = Object -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Rotate ((OBJECT *) Local_Shape, Vector);
-
- Rotate ((OBJECT *) Object -> Shape, Vector);
- Get_Rotation_Transformation (&Transformation, Vector);
- MTransformVector (&Object->Object_Center,
- &Object->Object_Center, &Transformation);
-
- Rotate_Texture (&Object->Object_Texture, Vector);
- }
-
- void Scale_Basic_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- SHAPE *Local_Shape;
-
- for (Local_Shape = Object -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Scale ((OBJECT *) Local_Shape, Vector);
-
- Scale ((OBJECT *) Object -> Shape, Vector);
-
- VEvaluate (Object -> Object_Center, Object -> Object_Center, *Vector);
-
- Scale_Texture (&Object->Object_Texture, Vector);
- }
-
- void Translate_Composite_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- OBJECT *Local_Object;
- SHAPE *Local_Shape;
-
- for (Local_Object = ((COMPOSITE *) Object) -> Objects;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- Translate (Local_Object, Vector);
-
- for (Local_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Translate ((OBJECT *) Local_Shape, Vector);
- }
-
- void Rotate_Composite_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- OBJECT *Local_Object;
- SHAPE *Local_Shape;
-
- for (Local_Object = ((COMPOSITE *) Object) -> Objects;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- Rotate (Local_Object, Vector);
-
- for (Local_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Rotate ((OBJECT *) Local_Shape, Vector);
- }
-
- void Scale_Composite_Object (Object, Vector)
- OBJECT *Object;
- VECTOR *Vector;
- {
- OBJECT *Local_Object;
- SHAPE *Local_Shape;
-
- for (Local_Object = ((COMPOSITE *) Object) -> Objects;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- Scale (Local_Object, Vector);
-
- for (Local_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Scale ((OBJECT *) Local_Shape, Vector);
- }
-
-
- void Invert_Basic_Object (Object)
- OBJECT *Object;
- {
- SHAPE *Local_Shape;
-
- for (Local_Shape = Object -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Invert ((OBJECT *) Local_Shape);
- Invert ((OBJECT *) Object -> Shape);
- }
-
- void Invert_Composite_Object (Object)
- OBJECT *Object;
- {
- OBJECT *Local_Object;
- SHAPE *Local_Shape;
-
- for (Local_Object = ((COMPOSITE *)Object) -> Objects;
- Local_Object != NULL ;
- Local_Object = Local_Object -> Next_Object)
-
- Invert (Local_Object);
-
- for (Local_Shape = ((COMPOSITE *) Object) -> Bounding_Shapes ;
- Local_Shape != NULL ;
- Local_Shape = Local_Shape -> Next_Object)
-
- Invert ((OBJECT *) Local_Shape);
- }
-