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/**
* $Id$
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2009 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): André Pinto.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef RE_RAYOBJECT_H
#define RE_RAYOBJECT_H
#ifdef __cplusplus
extern "C" {
#endif
#include "RE_raytrace.h"
#include "render_types.h"
#include <float.h>
/* RayObject
A ray object is everything where we can cast rays like:
* a face/triangle
* an octree
* a bvh tree
* an octree of bvh's
* a bvh of bvh's
All types of RayObjects can be created by implementing the
callbacks of the RayObject.
Due to high computing time evolved with casting on faces
there is a special type of RayObject (named RayFace)
which won't use callbacks like other generic nodes.
In order to allow a mixture of RayFace+RayObjects,
all RayObjects must be 4byte aligned, allowing us to use the
2 least significant bits (with the mask 0x02) to define the
type of RayObject.
This leads to 4 possible types of RayObject, but at the moment
only 2 are used:
addr&2 - type of object
0 Self (reserved for each structure)
1 RayFace
2 RayObject (generic with API callbacks)
3 unused
0 means it's reserved and has it own meaning inside each ray acceleration structure
(this way each structure can use the allign offset to determine if a node represents a
RayObject primitive, which can be used to save memory)
You actually don't need to care about this if you are only using the API
described on RE_raytrace.h
*/
typedef struct RayFace
{
float v1[4], v2[4], v3[4], v4[3];
int quad;
void *ob;
void *face;
} RayFace;
#define RE_rayface_isQuad(a) ((a)->quad)
struct RayObject
{
struct RayObjectAPI *api;
};
typedef int (*RE_rayobject_raycast_callback)(RayObject *, Isect *);
typedef void (*RE_rayobject_add_callback)(RayObject *raytree, RayObject *rayobject);
typedef void (*RE_rayobject_done_callback)(RayObject *);
typedef void (*RE_rayobject_free_callback)(RayObject *);
typedef void (*RE_rayobject_merge_bb_callback)(RayObject *, float *min, float *max);
typedef float (*RE_rayobject_cost_callback)(RayObject *);
typedef void (*RE_rayobject_hint_bb_callback)(RayObject *, RayHint *, float *, float *);
typedef struct RayObjectAPI
{
RE_rayobject_raycast_callback raycast;
RE_rayobject_add_callback add;
RE_rayobject_done_callback done;
RE_rayobject_free_callback free;
RE_rayobject_merge_bb_callback bb;
RE_rayobject_cost_callback cost;
RE_rayobject_hint_bb_callback hint_bb;
} RayObjectAPI;
#define RE_rayobject_align(o) ((RayObject*)(((intptr_t)o)&(~3)))
#define RE_rayobject_unalignRayFace(o) ((RayObject*)(((intptr_t)o)|1))
#define RE_rayobject_unalignRayAPI(o) ((RayObject*)(((intptr_t)o)|2))
#define RE_rayobject_isAligned(o) ((((intptr_t)o)&3) == 0)
#define RE_rayobject_isRayFace(o) ((((intptr_t)o)&3) == 1)
#define RE_rayobject_isRayAPI(o) ((((intptr_t)o)&3) == 2)
/*
* Loads a VlakRen on a RayFace
*/
void RE_rayface_from_vlak(RayFace *face, ObjectInstanceRen *obi, VlakRen *vlr);
/*
* Extend min/max coords so that the rayobject is inside them
*/
void RE_rayobject_merge_bb(RayObject *ob, float *min, float *max);
/*
* This function differs from RE_rayobject_raycast
* RE_rayobject_intersect does NOT perform last-hit optimization
* So this is probably a function to call inside raytrace structures
*/
int RE_rayobject_intersect(RayObject *r, Isect *i);
/*
* Returns distance ray must travel to hit the given bounding box
* BB should be in format [2][3]
*/
/* float RE_rayobject_bb_intersect(const Isect *i, const float *bb); */
int RE_rayobject_bb_intersect_test(const Isect *i, const float *bb); /* same as bb_intersect but doens't calculates distance */
/*
* Returns the expected cost of raycast on this node, primitives have a cost of 1
*/
float RE_rayobject_cost(RayObject *r);
#define ISECT_EPSILON ((float)FLT_EPSILON)
#if !defined(_WIN32)
#include <sys/time.h>
#include <time.h>
#include <stdio.h>
#define BENCH(a,name) \
do { \
double _t1, _t2; \
struct timeval _tstart, _tend; \
clock_t _clock_init = clock(); \
gettimeofday ( &_tstart, NULL); \
(a); \
gettimeofday ( &_tend, NULL); \
_t1 = ( double ) _tstart.tv_sec + ( double ) _tstart.tv_usec/ ( 1000*1000 ); \
_t2 = ( double ) _tend.tv_sec + ( double ) _tend.tv_usec/ ( 1000*1000 ); \
printf("BENCH:%s: %fs (real) %fs (cpu)\n", #name, _t2-_t1, (float)(clock()-_clock_init)/CLOCKS_PER_SEC);\
} while(0)
#else
#define BENCH(a) (a)
#endif
#ifdef __cplusplus
}
#endif
#endif
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