forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/*
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* Adapted from code copyright 2009-2010 NVIDIA Corporation
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* Modifications Copyright 2011, Blender Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __BVH_PARAMS_H__
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#define __BVH_PARAMS_H__
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CCL_NAMESPACE_BEGIN
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/* BVH Parameters */
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class BVHParams
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{
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public:
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/* spatial split area threshold */
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bool use_spatial_split;
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float spatial_split_alpha;
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/* SAH costs */
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float sah_node_cost;
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float sah_triangle_cost;
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/* number of triangles in leaf */
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int min_leaf_size;
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int max_leaf_size;
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/* object or mesh level bvh */
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bool top_level;
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/* disk cache */
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bool use_cache;
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/* QBVH */
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bool use_qbvh;
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/* fixed parameters */
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enum {
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MAX_DEPTH = 64,
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MAX_SPATIAL_DEPTH = 48,
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NUM_SPATIAL_BINS = 32
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};
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BVHParams()
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{
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use_spatial_split = true;
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spatial_split_alpha = 1e-5f;
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sah_node_cost = 1.0f;
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sah_triangle_cost = 1.0f;
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min_leaf_size = 1;
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max_leaf_size = 0x7FFFFFF;
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top_level = false;
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use_cache = false;
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use_qbvh = false;
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}
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/* SAH costs */
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float cost(int num_nodes, int num_tris) const
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{ return node_cost(num_nodes) + triangle_cost(num_tris); }
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float triangle_cost(int n) const
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{ return n*sah_triangle_cost; }
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float node_cost(int n) const
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{ return n*sah_node_cost; }
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};
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CCL_NAMESPACE_END
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#endif /* __BVH_PARAMS_H__ */
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