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/*
* 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.
*/
/** \file blender/render/intern/raytrace/rayobject_svbvh.cpp
* \ingroup render
*/
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "vbvh.h"
#include "svbvh.h"
#include "reorganize.h"
#ifdef __SSE__
#define DFS_STACK_SIZE 256
struct SVBVHTree {
RayObject rayobj;
SVBVHNode *root;
MemArena *node_arena;
float cost;
RTBuilder *builder;
};
/*
* Cost to test N childs
*/
struct PackCost {
float operator()(int n)
{
return (n / 4) + ((n % 4) > 2 ? 1 : n % 4);
}
};
template<>
void bvh_done<SVBVHTree>(SVBVHTree *obj)
{
rtbuild_done(obj->builder, &obj->rayobj.control);
//TODO find a away to exactly calculate the needed memory
MemArena *arena1 = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, "svbvh arena");
BLI_memarena_use_malloc(arena1);
MemArena *arena2 = BLI_memarena_new(BLI_MEMARENA_STD_BUFSIZE, "svbvh arena2");
BLI_memarena_use_malloc(arena2);
BLI_memarena_use_align(arena2, 16);
//Build and optimize the tree
if (0) {
VBVHNode *root = BuildBinaryVBVH<VBVHNode>(arena1, &obj->rayobj.control).transform(obj->builder);
if (RE_rayobjectcontrol_test_break(&obj->rayobj.control)) {
BLI_memarena_free(arena1);
BLI_memarena_free(arena2);
return;
}
reorganize(root);
remove_useless(root, &root);
bvh_refit(root);
pushup(root);
pushdown(root);
pushup_simd<VBVHNode, 4>(root);
obj->root = Reorganize_SVBVH<VBVHNode>(arena2).transform(root);
}
else {
//Finds the optimal packing of this tree using a given cost model
//TODO this uses quite a lot of memory, find ways to reduce memory usage during building
OVBVHNode *root = BuildBinaryVBVH<OVBVHNode>(arena1, &obj->rayobj.control).transform(obj->builder);
if (RE_rayobjectcontrol_test_break(&obj->rayobj.control)) {
BLI_memarena_free(arena1);
BLI_memarena_free(arena2);
return;
}
if (root) {
VBVH_optimalPackSIMD<OVBVHNode, PackCost>(PackCost()).transform(root);
obj->root = Reorganize_SVBVH<OVBVHNode>(arena2).transform(root);
}
else
obj->root = NULL;
}
//Free data
BLI_memarena_free(arena1);
obj->node_arena = arena2;
obj->cost = 1.0;
rtbuild_free(obj->builder);
obj->builder = NULL;
}
template<int StackSize>
static int intersect(SVBVHTree *obj, Isect *isec)
{
//TODO renable hint support
if (RE_rayobject_isAligned(obj->root)) {
if (isec->mode == RE_RAY_SHADOW)
return svbvh_node_stack_raycast<StackSize, true>(obj->root, isec);
else
return svbvh_node_stack_raycast<StackSize, false>(obj->root, isec);
}
else
return RE_rayobject_intersect( (RayObject *) obj->root, isec);
}
template<class Tree>
static void bvh_hint_bb(Tree *tree, LCTSHint *hint, float *UNUSED(min), float *UNUSED(max))
{
//TODO renable hint support
{
hint->size = 0;
hint->stack[hint->size++] = (RayObject *)tree->root;
}
}
/* the cast to pointer function is needed to workarround gcc bug: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11407 */
template<class Tree, int STACK_SIZE>
static RayObjectAPI make_api()
{
static RayObjectAPI api =
{
(RE_rayobject_raycast_callback) ((int (*)(Tree *, Isect *)) & intersect<STACK_SIZE>),
(RE_rayobject_add_callback) ((void (*)(Tree *, RayObject *)) & bvh_add<Tree>),
(RE_rayobject_done_callback) ((void (*)(Tree *)) & bvh_done<Tree>),
(RE_rayobject_free_callback) ((void (*)(Tree *)) & bvh_free<Tree>),
(RE_rayobject_merge_bb_callback)((void (*)(Tree *, float *, float *)) & bvh_bb<Tree>),
(RE_rayobject_cost_callback) ((float (*)(Tree *)) & bvh_cost<Tree>),
(RE_rayobject_hint_bb_callback) ((void (*)(Tree *, LCTSHint *, float *, float *)) & bvh_hint_bb<Tree>)
};
return api;
}
template<class Tree>
static RayObjectAPI *bvh_get_api(int maxstacksize)
{
static RayObjectAPI bvh_api256 = make_api<Tree, 1024>();
if (maxstacksize <= 1024) return &bvh_api256;
assert(maxstacksize <= 256);
return NULL;
}
RayObject *RE_rayobject_svbvh_create(int size)
{
return bvh_create_tree<SVBVHTree, DFS_STACK_SIZE>(size);
}
#else
RayObject *RE_rayobject_svbvh_create(int UNUSED(size))
{
puts("WARNING: SSE disabled at compile time\n");
return NULL;
}
#endif
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