dgSphere.h

/* Copyright (c) <2003-2011> <Julio Jerez, Newton Game Dynamics>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*/

#ifndef __dgSphere__
#define __dgSphere__

#include "dgStdafx.h"
#include "dgTypes.h"
#include "dgVector.h"
#include "dgMatrix.h"
#include "dgQuaternion.h"


//class dgFace;
class dgPlane;
//class dgCamera;

DG_MSC_VECTOR_ALIGMENT
class dgSphere: public dgMatrix {
public:
    constexpr dgSphere() : dgMatrix(
                               dgVector(dgFloat32(1.0f), dgFloat32(0.0f), dgFloat32(0.0f),
                                        dgFloat32(0.0f)),
                               dgVector(dgFloat32(0.0f), dgFloat32(1.0f), dgFloat32(0.0f),
                                        dgFloat32(0.0f)),
                               dgVector(dgFloat32(0.0f), dgFloat32(0.0f), dgFloat32(1.0f),
                                        dgFloat32(0.0f)),
                               dgVector(dgFloat32(0.0f), dgFloat32(0.0f), dgFloat32(0.0f),
                                        dgFloat32(1.0f))),
                           m_size(0, 0, 0, 0) {
    }
//  dgSphere (const dgQuaternion &quat, const dgVector &position, const dgVector dim = dgVector(0, 0, 0, 0));
//  dgSphere (const dgMatrix &matrix, const dgVector dim = dgVector(0, 0, 0, 0));

    dgSphere(const dgQuaternion &quat, const dgVector &position, const dgVector &dim = dgVector(0, 0, 0, 0));
    dgSphere(const dgMatrix &matrix, const dgVector &dim = dgVector(0, 0, 0, 0));

    dgSphere &operator= (const dgMatrix &arg);
    void Scale(dgFloat32 Ws, dgFloat32 Hs, dgFloat32 Bs) ;
    void SetDimensions(dgFloat32 W, dgFloat32 H, dgFloat32 B);
    void SetDimensions(const dgFloat32 vertex[], dgInt32 strideInBytes, dgInt32 vertexCount, const dgMatrix *basis = NULL);
    void SetDimensions(const dgFloat32 vertex[], dgInt32 strideInBytes, const dgInt32 trangles[], dgInt32 indexCount, const dgMatrix *basis);
//  void SetDimensions (const dgFloat32 vertex[], dgInt32 strideInBytes, const dgInt32 index[], dgInt32 indexCount, const dgMatrix *basis = NULL);

    // return:  0 if the sphere is wholly inside the viewport
    //          1 if the sphere is partially inside the viewport
    //         -1 if the sphere is wholly outside the viewport
//  dgInt32 VisibilityTest (const dgCamera* camera) const;
//  dgInt32 VisibilityTest (const dgCamera* camera, const dgMatrix &worldMatrix) const;
//  void Render (const dgCamera* camera, const dgMatrix &transform, unsigned rgb) const;

private:
    /*
        typedef dgInt32 (dgSphere::*CachedVisibilityTest) (const dgMatrix &point, const dgPlane* plane) const;

        mutable CachedVisibilityTest planeTest;
        static CachedVisibilityTest planeTestArray[6];

        void ChangeCachedVisibilityTest (CachedVisibilityTest   fnt);
        dgInt32 FrontTest  (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 RearTest   (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 LeftTest   (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 RightTest  (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 TopTest    (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 BottomTest (const dgMatrix &point, const dgPlane* plane) const;
        dgInt32 VisibilityTestLow (const dgCamera* camera, const dgMatrix& viewMNatrix) const;
    */

public:
    dgVector m_size;
} DG_GCC_VECTOR_ALIGMENT;


const dgSphere &GetIdentitySphere();


inline dgSphere &dgSphere::operator= (const dgMatrix &arg) {
    m_front = arg.m_front;
    m_up = arg.m_up;
    m_right = arg.m_right;
    m_posit = arg.m_posit;
    return *this;
}

inline void dgSphere::SetDimensions(dgFloat32 W, dgFloat32 H, dgFloat32 B) {
    m_size = dgVector(dgAbsf(W), dgAbsf(H), dgAbsf(B), dgSqrt(W * W + H * H + B * B));
}

inline void dgSphere::Scale(dgFloat32 Ws, dgFloat32 Hs, dgFloat32 Bs) {
    SetDimensions(m_size.m_x * Ws, m_size.m_y * Hs, m_size.m_z * Bs);
}


#endif