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https://github.com/MaSzyna-EU07/maszyna.git
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70 lines
2.7 KiB
C++
70 lines
2.7 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include "float3d.h"
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#include "dumb3d.h"
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// generic frustum class. used to determine if objects are inside current view area
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class cFrustum {
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public:
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// constructors:
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// methods:
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// update the frustum to match current view orientation
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void
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calculate();
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void
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calculate(glm::mat4 const &Projection, glm::mat4 const &Modelview);
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// returns true if specified point is inside of the frustum
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inline
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bool
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point_inside( float3 const &Point ) const { return point_inside( Point.x, Point.y, Point.z ); }
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inline
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bool
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point_inside( Math3D::vector3 const &Point ) const { return point_inside( static_cast<float>( Point.x ), static_cast<float>( Point.y ), static_cast<float>( Point.z ) ); }
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bool
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point_inside( float const X, float const Y, float const Z ) const;
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// tests if the sphere is in frustum, returns the distance between origin and sphere centre
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inline
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float
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sphere_inside( float3 const &Center, float const Radius ) const { return sphere_inside( Center.x, Center.y, Center.z, Radius ); }
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inline
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float
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sphere_inside( Math3D::vector3 const &Center, float const Radius ) const { return sphere_inside( static_cast<float>( Center.x ), static_cast<float>( Center.y ), static_cast<float>( Center.z ), Radius ); }
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float
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sphere_inside( float const X, float const Y, float const Z, float const Radius ) const;
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// returns true if specified cube is inside of the frustum. Size = half of the length
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inline
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bool
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cube_inside( float3 const &Center, float const Size ) const { return cube_inside( Center.x, Center.y, Center.z, Size ); }
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inline
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bool
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cube_inside( Math3D::vector3 const &Center, float const Size ) const { return cube_inside( static_cast<float>( Center.x ), static_cast<float>( Center.y ), static_cast<float>( Center.z ), Size ); }
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bool
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cube_inside( float const X, float const Y, float const Z, float const Size ) const;
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protected:
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// types:
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// planes of the frustum
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enum side { side_RIGHT = 0, side_LEFT = 1, side_BOTTOM = 2, side_TOP = 3, side_BACK = 4, side_FRONT = 5 };
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// parameters of the frustum plane: A, B, C define plane normal, D defines distance from origin
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enum plane { plane_A = 0, plane_B = 1, plane_C = 2, plane_D = 3 };
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// methods:
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void
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normalize_plane( cFrustum::side const Side ); // normalizes a plane (A side) from the frustum
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// members:
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float m_frustum[6][4]; // holds the A B C and D values (normal & distance) for each side of the frustum.
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};
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