forked from bartvdbraak/blender
167 lines
3.5 KiB
C++
167 lines
3.5 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __UTIL_BOUNDBOX_H__
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#define __UTIL_BOUNDBOX_H__
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#include <math.h>
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#include <float.h>
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#include "util_math.h"
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#include "util_string.h"
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#include "util_transform.h"
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#include "util_types.h"
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using namespace std;
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CCL_NAMESPACE_BEGIN
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class BoundBox
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{
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public:
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float3 min, max;
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__forceinline BoundBox()
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{
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}
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__forceinline BoundBox(const float3& pt)
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: min(pt), max(pt)
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{
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}
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__forceinline BoundBox(const float3& min_, const float3& max_)
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: min(min_), max(max_)
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{
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}
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enum empty_t { empty = 0};
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__forceinline BoundBox(empty_t)
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: min(make_float3(FLT_MAX, FLT_MAX, FLT_MAX)), max(make_float3(-FLT_MAX, -FLT_MAX, -FLT_MAX))
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{
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}
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__forceinline void grow(const float3& pt)
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{
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min = ccl::min(min, pt);
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max = ccl::max(max, pt);
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}
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__forceinline void grow(const BoundBox& bbox)
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{
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grow(bbox.min);
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grow(bbox.max);
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}
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__forceinline void intersect(const BoundBox& bbox)
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{
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min = ccl::max(min, bbox.min);
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max = ccl::min(max, bbox.max);
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}
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/* todo: avoid using this */
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__forceinline float safe_area() const
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{
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if(!((min.x <= max.x) && (min.y <= max.y) && (min.z <= max.z)))
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return 0.0f;
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return area();
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}
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__forceinline float area() const
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{
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return half_area()*2.0f;
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}
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__forceinline float half_area() const
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{
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float3 d = max - min;
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return (d.x*d.z + d.y*d.z + d.x*d.y);
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}
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__forceinline float3 center() const
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{
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return 0.5f*(min + max);
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}
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__forceinline float3 center2() const
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{
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return min + max;
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}
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__forceinline float3 size() const
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{
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return max - min;
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}
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__forceinline bool valid() const
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{
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return (min.x <= max.x) && (min.y <= max.y) && (min.z <= max.z) &&
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(isfinite(min.x) && isfinite(min.y) && isfinite(min.z)) &&
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(isfinite(max.x) && isfinite(max.y) && isfinite(max.z));
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}
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BoundBox transformed(const Transform *tfm)
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{
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BoundBox result = BoundBox::empty;
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for(int i = 0; i < 8; i++) {
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float3 p;
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p.x = (i & 1)? min.x: max.x;
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p.y = (i & 2)? min.y: max.y;
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p.z = (i & 4)? min.z: max.z;
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result.grow(transform_point(tfm, p));
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}
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return result;
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}
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};
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__forceinline BoundBox merge(const BoundBox& bbox, const float3& pt)
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{
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return BoundBox(min(bbox.min, pt), max(bbox.max, pt));
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}
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__forceinline BoundBox merge(const BoundBox& a, const BoundBox& b)
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{
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return BoundBox(min(a.min, b.min), max(a.max, b.max));
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}
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__forceinline BoundBox merge(const BoundBox& a, const BoundBox& b, const BoundBox& c, const BoundBox& d)
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{
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return merge(merge(a, b), merge(c, d));
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}
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__forceinline BoundBox intersect(const BoundBox& a, const BoundBox& b)
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{
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return BoundBox(max(a.min, b.min), min(a.max, b.max));
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}
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__forceinline BoundBox intersect(const BoundBox& a, const BoundBox& b, const BoundBox& c)
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{
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return intersect(a, intersect(b, c));
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}
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CCL_NAMESPACE_END
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#endif /* __UTIL_BOUNDBOX_H__ */
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