forked from bartvdbraak/blender
125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
/*
|
|
* 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_NODE_H__
|
|
#define __BVH_NODE_H__
|
|
|
|
#include "util_boundbox.h"
|
|
#include "util_debug.h"
|
|
#include "util_types.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
enum BVH_STAT
|
|
{
|
|
BVH_STAT_NODE_COUNT,
|
|
BVH_STAT_INNER_COUNT,
|
|
BVH_STAT_LEAF_COUNT,
|
|
BVH_STAT_TRIANGLE_COUNT,
|
|
BVH_STAT_CHILDNODE_COUNT
|
|
};
|
|
|
|
class BVHParams;
|
|
|
|
class BVHNode
|
|
{
|
|
public:
|
|
BVHNode()
|
|
{
|
|
}
|
|
|
|
virtual ~BVHNode() {}
|
|
virtual bool is_leaf() const = 0;
|
|
virtual int num_children() const = 0;
|
|
virtual BVHNode *get_child(int i) const = 0;
|
|
virtual int num_triangles() const { return 0; }
|
|
virtual void print(int depth = 0) const = 0;
|
|
|
|
BoundBox m_bounds;
|
|
uint m_visibility;
|
|
|
|
// Subtree functions
|
|
int getSubtreeSize(BVH_STAT stat=BVH_STAT_NODE_COUNT) const;
|
|
float computeSubtreeSAHCost(const BVHParams& p, float probability = 1.0f) const;
|
|
void deleteSubtree();
|
|
|
|
uint update_visibility();
|
|
};
|
|
|
|
class InnerNode : public BVHNode
|
|
{
|
|
public:
|
|
InnerNode(const BoundBox& bounds, BVHNode* child0, BVHNode* child1)
|
|
{
|
|
m_bounds = bounds;
|
|
children[0] = child0;
|
|
children[1] = child1;
|
|
|
|
if(child0 && child1)
|
|
m_visibility = child0->m_visibility|child1->m_visibility;
|
|
else
|
|
m_visibility = 0; /* happens on build cancel */
|
|
}
|
|
|
|
InnerNode(const BoundBox& bounds)
|
|
{
|
|
m_bounds = bounds;
|
|
m_visibility = 0;
|
|
children[0] = NULL;
|
|
children[1] = NULL;
|
|
}
|
|
|
|
bool is_leaf() const { return false; }
|
|
int num_children() const { return 2; }
|
|
BVHNode *get_child(int i) const{ assert(i>=0 && i<2); return children[i]; }
|
|
void print(int depth) const;
|
|
|
|
BVHNode *children[2];
|
|
};
|
|
|
|
class LeafNode : public BVHNode
|
|
{
|
|
public:
|
|
LeafNode(const BoundBox& bounds, uint visibility, int lo, int hi)
|
|
{
|
|
m_bounds = bounds;
|
|
m_visibility = visibility;
|
|
m_lo = lo;
|
|
m_hi = hi;
|
|
}
|
|
|
|
LeafNode(const LeafNode& s)
|
|
: BVHNode()
|
|
{
|
|
*this = s;
|
|
}
|
|
|
|
bool is_leaf() const { return true; }
|
|
int num_children() const { return 0; }
|
|
BVHNode *get_child(int) const { return NULL; }
|
|
int num_triangles() const { return m_hi - m_lo; }
|
|
void print(int depth) const;
|
|
|
|
int m_lo;
|
|
int m_hi;
|
|
};
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif /* __BVH_NODE_H__ */
|
|
|