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/*
* Adapted from code copyright 2009-2010 NVIDIA Corporation
* Modifications Copyright 2011, Blender Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __BVH_PARAMS_H__
#define __BVH_PARAMS_H__
CCL_NAMESPACE_BEGIN
/* BVH Parameters */
class BVHParams
{
public:
/* spatial split area threshold */
int use_spatial_split;
float spatial_split_alpha;
/* SAH costs */
float sah_node_cost;
float sah_triangle_cost;
/* number of triangles in leaf */
int min_leaf_size;
int max_leaf_size;
/* object or mesh level bvh */
int top_level;
/* disk cache */
int use_cache;
/* QBVH */
int use_qbvh;
int pad;
/* fixed parameters */
enum {
MAX_DEPTH = 64,
MAX_SPATIAL_DEPTH = 48,
NUM_SPATIAL_BINS = 32
};
BVHParams()
{
use_spatial_split = true;
spatial_split_alpha = 1e-5f;
sah_node_cost = 1.0f;
sah_triangle_cost = 1.0f;
min_leaf_size = 1;
max_leaf_size = 0x7FFFFFF;
top_level = false;
use_cache = false;
use_qbvh = false;
pad = false;
}
/* SAH costs */
float cost(int num_nodes, int num_tris) const
{ return node_cost(num_nodes) + triangle_cost(num_tris); }
float triangle_cost(int n) const
{ return n*sah_triangle_cost; }
float node_cost(int n) const
{ return n*sah_node_cost; }
};
CCL_NAMESPACE_END
#endif /* __BVH_PARAMS_H__ */
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