bgfx/examples/common/bounds.h

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/*
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* Copyright 2011-2015 Branimir Karadzic. All rights reserved.
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* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#ifndef BOUNDS_H_HEADER_GUARD
#define BOUNDS_H_HEADER_GUARD
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struct Aabb
{
float m_min[3];
float m_max[3];
};
struct Obb
{
float m_mtx[16];
};
struct Sphere
{
float m_center[3];
float m_radius;
};
/// Convert axis aligned bounding box to oriented bounding box.
void aabbToObb(Obb& _obb, const Aabb& _aabb);
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/// Convert sphere to axis aligned bounding box.
void sphereToAabb(Aabb& _aabb, const Sphere& _sphere);
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/// Calculate surface area of axis aligned bounding box.
float calcAabbArea(Aabb& _aabb);
/// Calculate axis aligned bounding box.
void calcAabb(Aabb& _aabb, const void* _vertices, uint32_t _numVertices, uint32_t _stride);
/// Transform vertices and calculate axis aligned bounding box.
void calcAabb(Aabb& _aabb, const float* _mtx, const void* _vertices, uint32_t _numVertices, uint32_t _stride);
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/// Expand AABB.
void aabbExpand(Aabb& _aabb, float _factor);
/// Returns 0 is two AABB don't overlap, otherwise returns flags of overlap
/// test.
uint32_t aabbOverlapTest(Aabb& _aabb0, Aabb& _aabb1);
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/// Calculate oriented bounding box.
void calcObb(Obb& _obb, const void* _vertices, uint32_t _numVertices, uint32_t _stride, uint32_t _steps = 17);
/// Calculate maximum bounding sphere.
void calcMaxBoundingSphere(Sphere& _sphere, const void* _vertices, uint32_t _numVertices, uint32_t _stride);
/// Calculate minimum bounding sphere.
void calcMinBoundingSphere(Sphere& _sphere, const void* _vertices, uint32_t _numVertices, uint32_t _stride, float _step = 0.01f);
#endif // BOUNDS_H_HEADER_GUARD