Frustum.h

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// Copyright © 2008-2023 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _FRUSTUM_H
#define _FRUSTUM_H
 
#include "Plane.h"
#include "libs.h"
#include "vector3.h"
 
namespace Graphics {
 
    // Frustum can be used for projecting points (3D to 2D) and testing
    // if a point lies inside the visible area
    // Its' internal projection matrix should, but does not have to, match
    // the one used for rendering
    class Frustum {
    public:
        // create for specified values
        Frustum(float width, float height, float fovAng, float nearClip, float farClip);
        Frustum(const matrix4x4d &modelview, const matrix4x4d &projection);
 
        // test if point (sphere) is in the frustum
        bool TestPoint(const vector3d &p, double radius) const;
        // test if point (sphere) is in the frustum, ignoring the far plane
        bool TestPointInfinite(const vector3d &p, double radius) const;
 
        // project a point onto the near plane (typically the screen)
        bool ProjectPoint(const vector3d &in, vector3d &out) const;
 
        // translate the given point outside the frustum to a point inside
        // returns scale factor to make object at that point appear correctly
        void TranslatePoint(const vector3d &in, vector3d &out) const;
 
    private:
        // create from current gl state
        Frustum();
 
        void InitFromMatrix(const matrix4x4d &m);
 
        matrix4x4d m_projMatrix;
        matrix4x4d m_modelMatrix;
        SPlane m_planes[6];
        double m_translateThresholdSqr;
    };
 
} // namespace Graphics
 
#endif