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
153 lines
3.2 KiB
C++
153 lines
3.2 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_BUILD_H__
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#define __BVH_BUILD_H__
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#include <float.h>
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#include "bvh.h"
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#include "util_boundbox.h"
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#include "util_vector.h"
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CCL_NAMESPACE_BEGIN
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class BVHParams;
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class Mesh;
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class Object;
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class Progress;
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/* BVH Builder */
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class BVHBuild
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{
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public:
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struct Reference
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{
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int prim_index;
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int prim_object;
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BoundBox bounds;
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Reference()
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{
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}
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};
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struct NodeSpec
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{
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int num;
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BoundBox bounds;
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NodeSpec()
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{
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num = 0;
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}
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};
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BVHBuild(
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const vector<Object*>& objects,
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vector<int>& prim_index,
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vector<int>& prim_object,
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const BVHParams& params,
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Progress& progress);
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~BVHBuild();
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BVHNode *run();
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protected:
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/* adding references */
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void add_reference_mesh(NodeSpec& root, Mesh *mesh, int i);
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void add_reference_object(NodeSpec& root, Object *ob, int i);
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void add_references(NodeSpec& root);
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/* building */
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BVHNode *build_node(const NodeSpec& spec, int level, float progress_start, float progress_end);
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BVHNode *create_leaf_node(const NodeSpec& spec);
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BVHNode *create_object_leaf_nodes(const Reference *ref, int num);
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void progress_update(float progress_start, float progress_end);
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/* object splits */
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struct ObjectSplit
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{
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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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ObjectSplit()
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: sah(FLT_MAX), dim(0), num_left(0)
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{
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}
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};
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ObjectSplit find_object_split(const NodeSpec& spec, float nodeSAH);
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void do_object_split(NodeSpec& left, NodeSpec& right, const NodeSpec& spec, const ObjectSplit& split);
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/* spatial splits */
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struct SpatialSplit
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{
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float sah;
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int dim;
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float pos;
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SpatialSplit()
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: sah(FLT_MAX), dim(0), pos(0.0f)
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{
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}
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};
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struct SpatialBin
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{
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BoundBox bounds;
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int enter;
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int exit;
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};
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SpatialSplit find_spatial_split(const NodeSpec& spec, float nodeSAH);
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void do_spatial_split(NodeSpec& left, NodeSpec& right, const NodeSpec& spec, const SpatialSplit& split);
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void split_reference(Reference& left, Reference& right, const Reference& ref, int dim, float pos);
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/* objects and primitive references */
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vector<Object*> objects;
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vector<Reference> references;
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/* output primitive indexes and objects */
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vector<int>& prim_index;
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vector<int>& prim_object;
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/* build parameters */
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BVHParams params;
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/* progress reporting */
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Progress& progress;
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double progress_start_time;
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int progress_num_duplicates;
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/* spatial splitting */
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float spatial_min_overlap;
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vector<BoundBox> spatial_right_bounds;
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SpatialBin spatial_bins[3][BVHParams::NUM_SPATIAL_BINS];
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};
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CCL_NAMESPACE_END
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#endif /* __BVH_BUILD_H__ */
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