forked from bartvdbraak/blender
99c1870ad5
This way it's easy to add more reference types allowed for splitting to the BVH reference split function without making this function too much big. This way it's possible to experiment with such features as splitting object instance references. So far should not be any functional changes.
130 lines
3.5 KiB
C++
130 lines
3.5 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_SPLIT_H__
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#define __BVH_SPLIT_H__
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#include "bvh_build.h"
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#include "bvh_params.h"
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CCL_NAMESPACE_BEGIN
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class BVHBuild;
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/* Object Split */
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class BVHObjectSplit
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{
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public:
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float sah;
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int dim;
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int num_left;
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BoundBox left_bounds;
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BoundBox right_bounds;
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BVHObjectSplit() {}
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BVHObjectSplit(BVHBuild *builder, const BVHRange& range, float nodeSAH);
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void split(BVHBuild *builder, BVHRange& left, BVHRange& right, const BVHRange& range);
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};
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/* Spatial Split */
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class BVHSpatialSplit
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{
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public:
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float sah;
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int dim;
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float pos;
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BVHSpatialSplit() : sah(FLT_MAX), dim(0), pos(0.0f) {}
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BVHSpatialSplit(BVHBuild *builder, const BVHRange& range, float nodeSAH);
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void split(BVHBuild *builder, BVHRange& left, BVHRange& right, const BVHRange& range);
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void split_reference(BVHBuild *builder,
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BVHReference& left,
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BVHReference& right,
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const BVHReference& ref,
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int dim,
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float pos);
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protected:
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void split_triangle_reference(const BVHReference& ref,
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const Mesh *mesh,
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int dim,
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float pos,
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BoundBox& left_bounds,
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BoundBox& right_bounds);
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void split_curve_reference(const BVHReference& ref,
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const Mesh *mesh,
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int dim,
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float pos,
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BoundBox& left_bounds,
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BoundBox& right_bounds);
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};
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/* Mixed Object-Spatial Split */
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class BVHMixedSplit
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{
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public:
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BVHObjectSplit object;
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BVHSpatialSplit spatial;
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float leafSAH;
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float nodeSAH;
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float minSAH;
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bool no_split;
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__forceinline BVHMixedSplit(BVHBuild *builder, const BVHRange& range, int level)
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{
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/* find split candidates. */
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float area = range.bounds().safe_area();
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leafSAH = area * builder->params.primitive_cost(range.size());
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nodeSAH = area * builder->params.node_cost(2);
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object = BVHObjectSplit(builder, range, nodeSAH);
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if(builder->params.use_spatial_split && level < BVHParams::MAX_SPATIAL_DEPTH) {
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BoundBox overlap = object.left_bounds;
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overlap.intersect(object.right_bounds);
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if(overlap.safe_area() >= builder->spatial_min_overlap)
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spatial = BVHSpatialSplit(builder, range, nodeSAH);
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}
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/* leaf SAH is the lowest => create leaf. */
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minSAH = min(min(leafSAH, object.sah), spatial.sah);
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no_split = (minSAH == leafSAH && builder->range_within_max_leaf_size(range));
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}
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__forceinline void split(BVHBuild *builder, BVHRange& left, BVHRange& right, const BVHRange& range)
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{
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if(builder->params.use_spatial_split && minSAH == spatial.sah)
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spatial.split(builder, left, right, range);
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if(!left.size() || !right.size())
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object.split(builder, left, right, range);
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}
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};
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CCL_NAMESPACE_END
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#endif /* __BVH_SPLIT_H__ */
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