371 lines
11 KiB
C
371 lines
11 KiB
C
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// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#ifndef __S_VIEW_FRUSTUM_H_INCLUDED__
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#define __S_VIEW_FRUSTUM_H_INCLUDED__
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#include "plane3d.h"
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#include "vector3d.h"
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#include "line3d.h"
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#include "aabbox3d.h"
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#include "matrix4.h"
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#include "IVideoDriver.h"
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namespace irr
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{
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namespace scene
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{
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//! Defines the view frustum. That's the space visible by the camera.
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/** The view frustum is enclosed by 6 planes. These six planes share
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eight points. A bounding box around these eight points is also stored in
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this structure.
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*/
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struct SViewFrustum
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{
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enum VFPLANES
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{
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//! Far plane of the frustum. That is the plane farest away from the eye.
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VF_FAR_PLANE = 0,
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//! Near plane of the frustum. That is the plane nearest to the eye.
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VF_NEAR_PLANE,
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//! Left plane of the frustum.
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VF_LEFT_PLANE,
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//! Right plane of the frustum.
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VF_RIGHT_PLANE,
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//! Bottom plane of the frustum.
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VF_BOTTOM_PLANE,
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//! Top plane of the frustum.
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VF_TOP_PLANE,
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//! Amount of planes enclosing the view frustum. Should be 6.
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VF_PLANE_COUNT
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};
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//! Default Constructor
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SViewFrustum() {}
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//! Copy Constructor
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SViewFrustum(const SViewFrustum& other);
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//! This constructor creates a view frustum based on a projection and/or view matrix.
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SViewFrustum(const core::matrix4& mat);
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//! This constructor creates a view frustum based on a projection and/or view matrix.
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inline void setFrom(const core::matrix4& mat);
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//! transforms the frustum by the matrix
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/** \param mat: Matrix by which the view frustum is transformed.*/
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void transform(const core::matrix4& mat);
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//! returns the point which is on the far left upper corner inside the the view frustum.
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core::vector3df getFarLeftUp() const;
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//! returns the point which is on the far left bottom corner inside the the view frustum.
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core::vector3df getFarLeftDown() const;
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//! returns the point which is on the far right top corner inside the the view frustum.
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core::vector3df getFarRightUp() const;
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//! returns the point which is on the far right bottom corner inside the the view frustum.
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core::vector3df getFarRightDown() const;
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//! returns the point which is on the near left upper corner inside the the view frustum.
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core::vector3df getNearLeftUp() const;
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//! returns the point which is on the near left bottom corner inside the the view frustum.
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core::vector3df getNearLeftDown() const;
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//! returns the point which is on the near right top corner inside the the view frustum.
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core::vector3df getNearRightUp() const;
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//! returns the point which is on the near right bottom corner inside the the view frustum.
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core::vector3df getNearRightDown() const;
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//! returns a bounding box enclosing the whole view frustum
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const core::aabbox3d<f32> &getBoundingBox() const;
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//! recalculates the bounding box member based on the planes
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inline void recalculateBoundingBox();
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//! get the given state's matrix based on frustum E_TRANSFORMATION_STATE
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core::matrix4& getTransform( video::E_TRANSFORMATION_STATE state);
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//! get the given state's matrix based on frustum E_TRANSFORMATION_STATE
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const core::matrix4& getTransform( video::E_TRANSFORMATION_STATE state) const;
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//! clips a line to the view frustum.
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/** \return True if the line was clipped, false if not */
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bool clipLine(core::line3d<f32>& line) const;
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//! the position of the camera
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core::vector3df cameraPosition;
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//! all planes enclosing the view frustum.
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core::plane3d<f32> planes[VF_PLANE_COUNT];
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//! bounding box around the view frustum
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core::aabbox3d<f32> boundingBox;
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private:
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//! Hold a copy of important transform matrices
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enum E_TRANSFORMATION_STATE_FRUSTUM
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{
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ETS_VIEW = 0,
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ETS_PROJECTION = 1,
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ETS_COUNT_FRUSTUM
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};
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//! Hold a copy of important transform matrices
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core::matrix4 Matrices[ETS_COUNT_FRUSTUM];
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};
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/*!
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Copy constructor ViewFrustum
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*/
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inline SViewFrustum::SViewFrustum(const SViewFrustum& other)
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{
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cameraPosition=other.cameraPosition;
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boundingBox=other.boundingBox;
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u32 i;
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for (i=0; i<VF_PLANE_COUNT; ++i)
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planes[i]=other.planes[i];
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for (i=0; i<ETS_COUNT_FRUSTUM; ++i)
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Matrices[i]=other.Matrices[i];
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}
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inline SViewFrustum::SViewFrustum(const core::matrix4& mat)
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{
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setFrom ( mat );
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}
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inline void SViewFrustum::transform(const core::matrix4& mat)
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{
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for (u32 i=0; i<VF_PLANE_COUNT; ++i)
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mat.transformPlane(planes[i]);
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mat.transformVect(cameraPosition);
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recalculateBoundingBox();
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}
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inline core::vector3df SViewFrustum::getFarLeftUp() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_TOP_PLANE],
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planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getFarLeftDown() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
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planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getFarRightUp() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_TOP_PLANE],
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planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getFarRightDown() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_FAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
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planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getNearLeftUp() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_NEAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_TOP_PLANE],
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planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getNearLeftDown() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_NEAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
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planes[scene::SViewFrustum::VF_LEFT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getNearRightUp() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_NEAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_TOP_PLANE],
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planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
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return p;
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}
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inline core::vector3df SViewFrustum::getNearRightDown() const
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{
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core::vector3df p;
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planes[scene::SViewFrustum::VF_NEAR_PLANE].getIntersectionWithPlanes(
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planes[scene::SViewFrustum::VF_BOTTOM_PLANE],
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planes[scene::SViewFrustum::VF_RIGHT_PLANE], p);
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return p;
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}
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inline const core::aabbox3d<f32> &SViewFrustum::getBoundingBox() const
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{
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return boundingBox;
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}
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inline void SViewFrustum::recalculateBoundingBox()
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{
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boundingBox.reset ( cameraPosition );
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boundingBox.addInternalPoint(getFarLeftUp());
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boundingBox.addInternalPoint(getFarRightUp());
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boundingBox.addInternalPoint(getFarLeftDown());
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boundingBox.addInternalPoint(getFarRightDown());
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}
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//! This constructor creates a view frustum based on a projection
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//! and/or view matrix.
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inline void SViewFrustum::setFrom(const core::matrix4& mat)
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{
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// left clipping plane
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planes[VF_LEFT_PLANE].Normal.X = mat[3 ] + mat[0];
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planes[VF_LEFT_PLANE].Normal.Y = mat[7 ] + mat[4];
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planes[VF_LEFT_PLANE].Normal.Z = mat[11] + mat[8];
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planes[VF_LEFT_PLANE].D = mat[15] + mat[12];
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// right clipping plane
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planes[VF_RIGHT_PLANE].Normal.X = mat[3 ] - mat[0];
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planes[VF_RIGHT_PLANE].Normal.Y = mat[7 ] - mat[4];
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planes[VF_RIGHT_PLANE].Normal.Z = mat[11] - mat[8];
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planes[VF_RIGHT_PLANE].D = mat[15] - mat[12];
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// top clipping plane
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planes[VF_TOP_PLANE].Normal.X = mat[3 ] - mat[1];
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planes[VF_TOP_PLANE].Normal.Y = mat[7 ] - mat[5];
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planes[VF_TOP_PLANE].Normal.Z = mat[11] - mat[9];
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planes[VF_TOP_PLANE].D = mat[15] - mat[13];
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// bottom clipping plane
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planes[VF_BOTTOM_PLANE].Normal.X = mat[3 ] + mat[1];
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planes[VF_BOTTOM_PLANE].Normal.Y = mat[7 ] + mat[5];
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planes[VF_BOTTOM_PLANE].Normal.Z = mat[11] + mat[9];
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planes[VF_BOTTOM_PLANE].D = mat[15] + mat[13];
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// far clipping plane
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planes[VF_FAR_PLANE].Normal.X = mat[3 ] - mat[2];
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planes[VF_FAR_PLANE].Normal.Y = mat[7 ] - mat[6];
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planes[VF_FAR_PLANE].Normal.Z = mat[11] - mat[10];
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planes[VF_FAR_PLANE].D = mat[15] - mat[14];
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// near clipping plane
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planes[VF_NEAR_PLANE].Normal.X = mat[2];
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planes[VF_NEAR_PLANE].Normal.Y = mat[6];
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planes[VF_NEAR_PLANE].Normal.Z = mat[10];
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planes[VF_NEAR_PLANE].D = mat[14];
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// normalize normals
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u32 i;
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for ( i=0; i != VF_PLANE_COUNT; ++i)
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{
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const f32 len = -core::reciprocal_squareroot(
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planes[i].Normal.getLengthSQ());
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planes[i].Normal *= len;
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planes[i].D *= len;
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}
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// make bounding box
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recalculateBoundingBox();
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}
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/*!
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View Frustum depends on Projection & View Matrix
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*/
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inline core::matrix4& SViewFrustum::getTransform(video::E_TRANSFORMATION_STATE state )
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{
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u32 index = 0;
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switch ( state )
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{
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case video::ETS_PROJECTION:
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index = SViewFrustum::ETS_PROJECTION; break;
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case video::ETS_VIEW:
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index = SViewFrustum::ETS_VIEW; break;
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default:
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break;
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}
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return Matrices [ index ];
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}
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/*!
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View Frustum depends on Projection & View Matrix
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*/
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inline const core::matrix4& SViewFrustum::getTransform(video::E_TRANSFORMATION_STATE state ) const
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{
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u32 index = 0;
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switch ( state )
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{
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case video::ETS_PROJECTION:
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index = SViewFrustum::ETS_PROJECTION; break;
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case video::ETS_VIEW:
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index = SViewFrustum::ETS_VIEW; break;
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default:
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break;
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}
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return Matrices [ index ];
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}
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//! Clips a line to the frustum
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inline bool SViewFrustum::clipLine(core::line3d<f32>& line) const
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{
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bool wasClipped = false;
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for (u32 i=0; i < VF_PLANE_COUNT; ++i)
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{
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if (planes[i].classifyPointRelation(line.start) == core::ISREL3D_FRONT)
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{
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line.start = line.start.getInterpolated(line.end,
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planes[i].getKnownIntersectionWithLine(line.start, line.end));
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wasClipped = true;
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}
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if (planes[i].classifyPointRelation(line.end) == core::ISREL3D_FRONT)
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{
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line.end = line.start.getInterpolated(line.end,
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planes[i].getKnownIntersectionWithLine(line.start, line.end));
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wasClipped = true;
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}
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}
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return wasClipped;
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}
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} // end namespace scene
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} // end namespace irr
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#endif
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