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/*
* ***** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 *****
*/
/** \file blender/render/intern/raytrace/rayobject_blibvh.cpp
* \ingroup render
*/
#include <assert.h>
#include "MEM_guardedalloc.h"
#include "BLI_kdopbvh.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"
#include "rayintersection.h"
#include "rayobject.h"
static int RE_rayobject_blibvh_intersect(RayObject *o, Isect *isec);
static void RE_rayobject_blibvh_add(RayObject *o, RayObject *ob);
static void RE_rayobject_blibvh_done(RayObject *o);
static void RE_rayobject_blibvh_free(RayObject *o);
static void RE_rayobject_blibvh_bb(RayObject *o, float *min, float *max);
static float RE_rayobject_blibvh_cost(RayObject *UNUSED(o))
{
//TODO calculate the expected cost to raycast on this structure
return 1.0;
}
static void RE_rayobject_blibvh_hint_bb(RayObject *UNUSED(o), RayHint *UNUSED(hint),
float *UNUSED(min), float *UNUSED(max))
{
return;
}
static RayObjectAPI bvh_api =
{
RE_rayobject_blibvh_intersect,
RE_rayobject_blibvh_add,
RE_rayobject_blibvh_done,
RE_rayobject_blibvh_free,
RE_rayobject_blibvh_bb,
RE_rayobject_blibvh_cost,
RE_rayobject_blibvh_hint_bb
};
typedef struct BVHObject
{
RayObject rayobj;
RayObject **leafs, **next_leaf;
BVHTree *bvh;
float bb[2][3];
} BVHObject;
RayObject *RE_rayobject_blibvh_create(int size)
{
BVHObject *obj= (BVHObject*)MEM_callocN(sizeof(BVHObject), "BVHObject");
assert(RE_rayobject_isAligned(obj)); /* RayObject API assumes real data to be 4-byte aligned */
obj->rayobj.api = &bvh_api;
obj->bvh = BLI_bvhtree_new(size, 0.0, 4, 6);
obj->next_leaf = obj->leafs = (RayObject**)MEM_callocN(size*sizeof(RayObject*), "BVHObject leafs");
INIT_MINMAX(obj->bb[0], obj->bb[1]);
return RE_rayobject_unalignRayAPI((RayObject*) obj);
}
struct BVHCallbackUserData
{
Isect *isec;
RayObject **leafs;
};
static void bvh_callback(void *userdata, int index, const BVHTreeRay *UNUSED(ray), BVHTreeRayHit *hit)
{
struct BVHCallbackUserData *data = (struct BVHCallbackUserData*)userdata;
Isect *isec = data->isec;
RayObject *face = data->leafs[index];
if (RE_rayobject_intersect(face, isec)) {
hit->index = index;
if (isec->mode == RE_RAY_SHADOW)
hit->dist = 0;
else
hit->dist = isec->dist;
}
}
static int RE_rayobject_blibvh_intersect(RayObject *o, Isect *isec)
{
BVHObject *obj = (BVHObject*)o;
BVHTreeRayHit hit;
float dir[3];
struct BVHCallbackUserData data;
data.isec = isec;
data.leafs = obj->leafs;
copy_v3_v3(dir, isec->dir);
hit.index = 0;
hit.dist = isec->dist;
return BLI_bvhtree_ray_cast(obj->bvh, isec->start, dir, 0.0, &hit, bvh_callback, (void*)&data);
}
static void RE_rayobject_blibvh_add(RayObject *o, RayObject *ob)
{
BVHObject *obj = (BVHObject*)o;
float min_max[6];
INIT_MINMAX(min_max, min_max+3);
RE_rayobject_merge_bb(ob, min_max, min_max+3);
DO_MIN(min_max , obj->bb[0]);
DO_MAX(min_max+3, obj->bb[1]);
BLI_bvhtree_insert(obj->bvh, obj->next_leaf - obj->leafs, min_max, 2);
*(obj->next_leaf++) = ob;
}
static void RE_rayobject_blibvh_done(RayObject *o)
{
BVHObject *obj = (BVHObject*)o;
BLI_bvhtree_balance(obj->bvh);
}
static void RE_rayobject_blibvh_free(RayObject *o)
{
BVHObject *obj = (BVHObject*)o;
if (obj->bvh)
BLI_bvhtree_free(obj->bvh);
if (obj->leafs)
MEM_freeN(obj->leafs);
MEM_freeN(obj);
}
static void RE_rayobject_blibvh_bb(RayObject *o, float *min, float *max)
{
BVHObject *obj = (BVHObject*)o;
DO_MIN(obj->bb[0], min);
DO_MAX(obj->bb[1], max);
}
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