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https://github.com/leozide/leocad
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879 lines
22 KiB
C++
879 lines
22 KiB
C++
#ifndef _LC_MATH_H_
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#define _LC_MATH_H_
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#include <math.h>
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#include <float.h>
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class lcVector3;
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class lcVector4;
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class lcMatrix33;
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class lcMatrix44;
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class lcVector3
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{
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public:
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lcVector3()
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{
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}
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lcVector3(const float _x, const float _y, const float _z)
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: x(_x), y(_y), z(_z)
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{
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}
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lcVector3(const lcVector3& a)
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: x(a.x), y(a.y), z(a.z)
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{
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}
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operator const float*() const
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{
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return (const float*)this;
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}
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operator float*()
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{
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return (float*)this;
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}
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const float& operator[](int i) const
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{
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return ((float*)this)[i];
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}
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float& operator[](int i)
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{
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return ((float*)this)[i];
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}
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void Normalize();
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float Length() const;
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float LengthSquared() const;
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float x, y, z;
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};
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class lcVector4
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{
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public:
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lcVector4()
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{
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}
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lcVector4(const float _x, const float _y, const float _z, const float _w)
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: x(_x), y(_y), z(_z), w(_w)
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{
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}
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lcVector4(const lcVector3& _xyz, const float _w)
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: x(_xyz.x), y(_xyz.y), z(_xyz.z), w(_w)
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{
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}
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operator const float*() const
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{
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return (const float*)this;
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}
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operator float*()
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{
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return (float*)this;
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}
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const float& operator[](int i) const
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{
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return ((float*)this)[i];
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}
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float& operator[](int i)
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{
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return ((float*)this)[i];
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}
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float x, y, z, w;
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};
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class lcMatrix44
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{
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public:
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lcMatrix44()
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{
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}
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lcMatrix44(const lcVector4& _x, const lcVector4& _y, const lcVector4& _z, const lcVector4& _w)
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{
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r[0] = _x;
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r[1] = _y;
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r[2] = _z;
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r[3] = _w;
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}
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void SetTranslation(const lcVector3& Translation)
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{
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r[3] = lcVector4(Translation[0], Translation[1], Translation[2], 1.0f);
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}
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operator const float*() const
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{
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return (const float*)this;
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}
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operator float*()
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{
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return (float*)this;
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}
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const lcVector4& operator[](int i) const
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{
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return r[i];
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}
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lcVector4& operator[](int i)
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{
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return r[i];
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}
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lcVector4 r[4];
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};
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inline lcVector3 operator+(const lcVector3& a, const lcVector3& b)
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{
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return lcVector3(a.x + b.x, a.y + b.y, a.z + b.z);
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}
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inline lcVector3 operator-(const lcVector3& a, const lcVector3& b)
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{
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return lcVector3(a.x - b.x, a.y - b.y, a.z - b.z);
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}
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inline lcVector3 operator*(const lcVector3& a, const lcVector3& b)
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{
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return lcVector3(a.x * b.x, a.y * b.y, a.z * b.z);
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}
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inline lcVector3 operator/(const lcVector3& a, const lcVector3& b)
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{
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return lcVector3(a.x / b.x, a.y / b.y, a.z / b.z);
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}
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inline lcVector3 operator*(const lcVector3& a, float b)
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{
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return lcVector3(a.x * b, a.y * b, a.z * b);
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}
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inline lcVector3 operator/(const lcVector3& a, float b)
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{
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return lcVector3(a.x / b, a.y / b, a.z / b);
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}
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inline lcVector3 operator-(const lcVector3& a)
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{
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return lcVector3(-a.x, -a.y, -a.z);
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}
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inline lcVector3& operator+=(lcVector3& a, const lcVector3& b)
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{
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a.x += b.x;
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a.y += b.y;
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a.z += b.z;
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return a;
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}
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inline lcVector3& operator-=(lcVector3& a, const lcVector3& b)
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{
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a.x -= b.x;
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a.y -= b.y;
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a.z -= b.z;
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return a;
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}
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inline lcVector3& operator*=(lcVector3& a, const lcVector3& b)
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{
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a.x *= b.x;
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a.y *= b.y;
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a.z *= b.z;
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return a;
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}
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inline lcVector3& operator/=(lcVector3& a, const lcVector3& b)
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{
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a.x /= b.x;
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a.y /= b.y;
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a.z /= b.z;
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return a;
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}
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inline lcVector3& operator*=(lcVector3& a, float b)
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{
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a.x *= b;
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a.y *= b;
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a.z *= b;
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return a;
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}
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inline lcVector3& operator/=(lcVector3& a, float b)
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{
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a.x /= b;
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a.y /= b;
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a.z /= b;
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return a;
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}
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inline void lcVector3::Normalize()
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{
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float InvLength = 1.0f / Length();
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x *= InvLength;
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y *= InvLength;
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z *= InvLength;
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}
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inline float lcVector3::Length() const
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{
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return sqrtf(x * x + y * y + z * z);
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}
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inline float lcVector3::LengthSquared() const
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{
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return x * x + y * y + z * z;
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}
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inline lcVector3 lcNormalize(const lcVector3& a)
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{
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lcVector3 Ret(a);
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Ret.Normalize();
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return Ret;
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}
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inline float lcDot(const lcVector3& a, const lcVector3& b)
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{
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return a.x * b.x + a.y * b.y + a.z * b.z;
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}
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inline float lcDot(const lcVector4& a, const lcVector4& b)
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{
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return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;
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}
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inline lcVector3 lcCross(const lcVector3& a, const lcVector3& b)
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{
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return lcVector3(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);
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}
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inline lcVector4 operator+(const lcVector4& a, const lcVector4& b)
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{
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return lcVector4(a.x + b.x, a.y + b.y, a.z + b.z, a.w + b.w);
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}
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inline lcVector4 operator-(const lcVector4& a, const lcVector4& b)
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{
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return lcVector4(a.x - b.x, a.y - b.y, a.z - b.z, a.w - b.w);
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}
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inline lcVector4 operator*(const lcVector4& a, float f)
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{
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return lcVector4(a.x * f, a.y * f, a.z * f, a.w * f);
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}
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inline lcVector4 operator*(const lcVector4& a, const lcVector4& b)
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{
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return lcVector4(a.x * b.x, a.y * b.y, a.z * b.z, a.w * b.w);
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}
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inline lcVector4 operator/(const lcVector4& a, float f)
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{
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return lcVector4(a.x / f, a.y / f, a.z / f, a.w / f);
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}
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inline lcVector4 operator/(const lcVector4& a, const lcVector4& b)
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{
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return lcVector4(a.x / b.x, a.y / b.y, a.z / b.z, a.w / b.w);
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}
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inline lcVector4& operator*=(lcVector4& a, float b)
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{
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a.x *= b;
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a.y *= b;
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a.z *= b;
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a.w *= b;
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return a;
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}
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inline lcVector4& operator/=(lcVector4& a, float b)
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{
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a.x /= b;
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a.y /= b;
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a.z /= b;
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a.w /= b;
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return a;
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}
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inline lcVector3 lcMul31(const lcVector3& a, const lcMatrix44& b)
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{
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lcVector4 v = b.r[0] * a[0] + b.r[1] * a[1] + b.r[2] * a[2] + b.r[3];
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return lcVector3(v[0], v[1], v[2]);
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}
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inline lcVector3 lcMul30(const lcVector3& a, const lcMatrix44& b)
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{
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lcVector4 v = b.r[0] * a[0] + b.r[1] * a[1] + b.r[2] * a[2];
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return lcVector3(v[0], v[1], v[2]);
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}
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inline lcVector4 lcMul4(const lcVector4& a, const lcMatrix44& b)
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{
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return b.r[0] * a[0] + b.r[1] * a[1] + b.r[2] * a[2] + b.r[3] * a[3];
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}
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inline lcMatrix44 lcMul(const lcMatrix44& a, const lcMatrix44& b)
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{
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lcVector4 Col0(b.r[0][0], b.r[1][0], b.r[2][0], b.r[3][0]);
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lcVector4 Col1(b.r[0][1], b.r[1][1], b.r[2][1], b.r[3][1]);
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lcVector4 Col2(b.r[0][2], b.r[1][2], b.r[2][2], b.r[3][2]);
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lcVector4 Col3(b.r[0][3], b.r[1][3], b.r[2][3], b.r[3][3]);
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lcVector4 Ret0(lcDot(a.r[0], Col0), lcDot(a.r[0], Col1), lcDot(a.r[0], Col2), lcDot(a.r[0], Col3));
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lcVector4 Ret1(lcDot(a.r[1], Col0), lcDot(a.r[1], Col1), lcDot(a.r[1], Col2), lcDot(a.r[1], Col3));
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lcVector4 Ret2(lcDot(a.r[2], Col0), lcDot(a.r[2], Col1), lcDot(a.r[2], Col2), lcDot(a.r[2], Col3));
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lcVector4 Ret3(lcDot(a.r[3], Col0), lcDot(a.r[3], Col1), lcDot(a.r[3], Col2), lcDot(a.r[3], Col3));
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return lcMatrix44(Ret0, Ret1, Ret2, Ret3);
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}
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inline lcMatrix44 lcMatrix44Identity()
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{
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lcMatrix44 m;
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m.r[0] = lcVector4(1.0f, 0.0f, 0.0f, 0.0f);
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m.r[1] = lcVector4(0.0f, 1.0f, 0.0f, 0.0f);
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m.r[2] = lcVector4(0.0f, 0.0f, 1.0f, 0.0f);
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m.r[3] = lcVector4(0.0f, 0.0f, 0.0f, 1.0f);
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return m;
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}
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inline lcMatrix44 lcMatrix44Translation(const lcVector3& Translation)
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{
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lcMatrix44 m;
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m.r[0] = lcVector4(1.0f, 0.0f, 0.0f, 0.0f);
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m.r[1] = lcVector4(0.0f, 1.0f, 0.0f, 0.0f);
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m.r[2] = lcVector4(0.0f, 0.0f, 1.0f, 0.0f);
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m.r[3] = lcVector4(Translation[0], Translation[1], Translation[2], 1.0f);
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return m;
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}
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inline lcMatrix44 lcMatrix44RotationX(const float Radians)
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{
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float s, c;
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s = sinf(Radians);
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c = cosf(Radians);
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lcMatrix44 m;
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m.r[0] = lcVector4(1.0f, 0.0f, 0.0f, 0.0f);
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m.r[1] = lcVector4(0.0f, c, s, 0.0f);
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m.r[2] = lcVector4(0.0f, -s, c, 0.0f);
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m.r[3] = lcVector4(0.0f, 0.0f, 0.0f, 1.0f);
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return m;
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}
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inline lcMatrix44 lcMatrix44RotationY(const float Radians)
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{
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float s, c;
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s = sinf(Radians);
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c = cosf(Radians);
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lcMatrix44 m;
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m.r[0] = lcVector4( c, 0.0f, -s, 0.0f);
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m.r[1] = lcVector4(0.0f, 1.0f, 0.0f, 0.0f);
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m.r[2] = lcVector4( s, 0.0f, c, 0.0f);
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m.r[3] = lcVector4(0.0f, 0.0f, 0.0f, 1.0f);
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return m;
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}
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inline lcMatrix44 lcMatrix44RotationZ(const float Radians)
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{
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float s, c;
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s = sinf(Radians);
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c = cosf(Radians);
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lcMatrix44 m;
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m.r[0] = lcVector4( c, s, 0.0f, 0.0f);
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m.r[1] = lcVector4( -s, c, 0.0f, 0.0f);
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m.r[2] = lcVector4(0.0f, 0.0f, 1.0f, 0.0f);
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m.r[3] = lcVector4(0.0f, 0.0f, 0.0f, 1.0f);
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return m;
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}
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inline lcMatrix44 lcMatrix44LookAt(const lcVector3& Eye, const lcVector3& Target, const lcVector3& Up)
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{
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lcVector3 x, y, z;
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z = lcNormalize(Eye - Target);
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x = lcNormalize(lcCross(Up, z));
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y = lcNormalize(lcCross(z, x));
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lcMatrix44 m;
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m.r[0] = lcVector4(x[0], y[0], z[0], 0.0f);
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m.r[1] = lcVector4(x[1], y[1], z[1], 0.0f);
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m.r[2] = lcVector4(x[2], y[2], z[2], 0.0f);
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m.r[3] = m.r[0] * -Eye[0] + m.r[1] * -Eye[1] + m.r[2] * -Eye[2];
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m.r[3][3] = 1.0f;
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return m;
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}
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inline lcMatrix44 lcMatrix44Perspective(float FoVy, float Aspect, float Near, float Far)
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{
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float Left, Right, Bottom, Top;
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Top = Near * (float)tan(FoVy * LC_PI / 360.0f);
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Bottom = -Top;
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Left = Bottom * Aspect;
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Right = Top * Aspect;
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if ((Near <= 0.0f) || (Far <= 0.0f) || (Near == Far) || (Left == Right) || (Top == Bottom))
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return lcMatrix44Identity();
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float x, y, a, b, c, d;
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x = (2.0f * Near) / (Right - Left);
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y = (2.0f * Near) / (Top - Bottom);
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a = (Right + Left) / (Right - Left);
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b = (Top + Bottom) / (Top - Bottom);
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c = -(Far + Near) / (Far - Near);
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d = -(2.0f * Far * Near) / (Far - Near);
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lcMatrix44 m;
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m.r[0] = lcVector4(x, 0, 0, 0);
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m.r[1] = lcVector4(0, y, 0, 0);
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m.r[2] = lcVector4(a, b, c, -1);
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m.r[3] = lcVector4(0, 0, d, 0);
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return m;
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}
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inline lcMatrix44 lcMatrix44FromAxisAngle(const lcVector3& Axis, const float Radians)
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{
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float s, c, mag, xx, yy, zz, xy, yz, zx, xs, ys, zs, one_c;
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s = sinf(Radians);
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c = cosf(Radians);
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mag = Axis.Length();
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if (mag == 0.0f)
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return lcMatrix44Identity();
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lcVector3 Normal = Axis * (1.0f / mag);
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xx = Normal[0] * Normal[0];
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yy = Normal[1] * Normal[1];
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zz = Normal[2] * Normal[2];
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xy = Normal[0] * Normal[1];
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yz = Normal[1] * Normal[2];
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zx = Normal[2] * Normal[0];
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xs = Normal[0] * s;
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ys = Normal[1] * s;
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zs = Normal[2] * s;
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one_c = 1.0f - c;
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lcMatrix44 m;
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m.r[0] = lcVector4((one_c * xx) + c, (one_c * xy) + zs, (one_c * zx) - ys, 0.0f);
|
|
m.r[1] = lcVector4((one_c * xy) - zs, (one_c * yy) + c, (one_c * yz) + xs, 0.0f);
|
|
m.r[2] = lcVector4((one_c * zx) + ys, (one_c * yz) - xs, (one_c * zz) + c, 0.0f);
|
|
m.r[3] = lcVector4(0.0f, 0.0f, 0.0f, 1.0f);
|
|
|
|
return m;
|
|
}
|
|
|
|
inline lcVector4 lcMatrix44ToAxisAngle(const lcMatrix44& m)
|
|
{
|
|
lcVector3 Rows[3];
|
|
Rows[0] = lcNormalize(lcVector3(m.r[0][0], m.r[0][1], m.r[0][2]));
|
|
Rows[1] = lcNormalize(lcVector3(m.r[1][0], m.r[1][1], m.r[1][2]));
|
|
Rows[2] = lcNormalize(lcVector3(m.r[2][0], m.r[2][1], m.r[2][2]));
|
|
|
|
// Determinant should be 1 for rotation matrices.
|
|
float Determinant = Rows[0][0] * Rows[1][1] * Rows[2][2] + Rows[0][1] * Rows[1][2] * Rows[2][0] +
|
|
Rows[0][2] * Rows[1][0] * Rows[2][1] - Rows[0][0] * Rows[1][2] * Rows[2][1] -
|
|
Rows[0][1] * Rows[1][0] * Rows[2][2] - Rows[0][2] * Rows[1][1] * Rows[2][0];
|
|
|
|
if (Determinant < 0.0f)
|
|
Rows[0] *= -1.0f;
|
|
|
|
float Trace = Rows[0][0] + Rows[1][1] + Rows[2][2];
|
|
float Cos = 0.5f * (Trace - 1.0f);
|
|
lcVector4 rot;
|
|
|
|
if (Cos < -1.0f)
|
|
Cos = -1.0f;
|
|
else if (Cos > 1.0f)
|
|
Cos = 1.0f;
|
|
rot[3] = acosf(Cos); // in [0,PI]
|
|
|
|
if (rot[3] > 0.01f)
|
|
{
|
|
if (fabsf(3.141592f - rot[3]) > 0.01f)
|
|
{
|
|
rot[0] = Rows[1][2] - Rows[2][1];
|
|
rot[1] = Rows[2][0] - Rows[0][2];
|
|
rot[2] = Rows[0][1] - Rows[1][0];
|
|
|
|
float inv = 1.0f / sqrtf(rot[0]*rot[0] + rot[1]*rot[1] + rot[2]*rot[2]);
|
|
|
|
rot[0] *= inv;
|
|
rot[1] *= inv;
|
|
rot[2] *= inv;
|
|
}
|
|
else
|
|
{
|
|
// angle is PI
|
|
float HalfInverse;
|
|
if (Rows[0][0] >= Rows[1][1])
|
|
{
|
|
// r00 >= r11
|
|
if (Rows[0][0] >= Rows[2][2])
|
|
{
|
|
// r00 is maximum diagonal term
|
|
rot[0] = 0.5f * sqrtf(Rows[0][0] - Rows[1][1] - Rows[2][2] + 1.0f);
|
|
HalfInverse = 0.5f / rot[0];
|
|
rot[1] = HalfInverse * Rows[1][0];
|
|
rot[2] = HalfInverse * Rows[2][0];
|
|
}
|
|
else
|
|
{
|
|
// r22 is maximum diagonal term
|
|
rot[2] = 0.5f * sqrtf(Rows[2][2] - Rows[0][0] - Rows[1][1] + 1.0f);
|
|
HalfInverse = 0.5f / rot[2];
|
|
rot[0] = HalfInverse * Rows[2][0];
|
|
rot[1] = HalfInverse * Rows[2][1];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// r11 > r00
|
|
if (Rows[1][1] >= Rows[2][2])
|
|
{
|
|
// r11 is maximum diagonal term
|
|
rot[1] = 0.5f * sqrtf(Rows[1][1] - Rows[0][0] - Rows[2][2] + 1.0f);
|
|
HalfInverse = 0.5f / rot[1];
|
|
rot[0] = HalfInverse * Rows[1][0];
|
|
rot[2] = HalfInverse * Rows[2][1];
|
|
}
|
|
else
|
|
{
|
|
// r22 is maximum diagonal term
|
|
rot[2] = 0.5f * sqrtf(Rows[2][2] - Rows[0][0] - Rows[1][1] + 1.0f);
|
|
HalfInverse = 0.5f / rot[2];
|
|
rot[0] = HalfInverse * Rows[2][0];
|
|
rot[1] = HalfInverse * Rows[2][1];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// The angle is 0 and the matrix is the identity.
|
|
rot[0] = 0.0f;
|
|
rot[1] = 0.0f;
|
|
rot[2] = 1.0f;
|
|
}
|
|
|
|
return rot;
|
|
}
|
|
|
|
inline lcMatrix44 lcMatrix44Transpose(const lcMatrix44& m)
|
|
{
|
|
lcMatrix44 t;
|
|
|
|
t.r[0] = lcVector4(m[0][0], m[1][0], m[2][0], m[3][0]);
|
|
t.r[1] = lcVector4(m[0][1], m[1][1], m[2][1], m[3][1]);
|
|
t.r[2] = lcVector4(m[0][2], m[1][2], m[2][2], m[3][2]);
|
|
t.r[3] = lcVector4(m[0][3], m[1][3], m[2][3], m[3][3]);
|
|
|
|
return t;
|
|
}
|
|
|
|
inline lcMatrix44 lcMatrix44AffineInverse(const lcMatrix44& m)
|
|
{
|
|
lcMatrix44 Inv;
|
|
|
|
Inv.r[0] = lcVector4(m.r[0][0], m.r[1][0], m.r[2][0], m.r[0][3]);
|
|
Inv.r[1] = lcVector4(m.r[0][1], m.r[1][1], m.r[2][1], m.r[1][3]);
|
|
Inv.r[2] = lcVector4(m.r[0][2], m.r[1][2], m.r[2][2], m.r[2][3]);
|
|
|
|
lcVector3 Trans = -lcMul30(lcVector3(m[3][0], m[3][1], m[3][2]), Inv);
|
|
Inv.r[3] = lcVector4(Trans[0], Trans[1], Trans[2], 1.0f);
|
|
|
|
return Inv;
|
|
}
|
|
|
|
// Inverse code from the GLU library.
|
|
inline lcMatrix44 lcMatrix44Inverse(const lcMatrix44& m)
|
|
{
|
|
#define SWAP_ROWS(a, b) { float *_tmp = a; (a)=(b); (b)=_tmp; }
|
|
#define MAT(m,col,row) m.r[row][col]
|
|
|
|
float wtmp[4][8];
|
|
float m0, m1, m2, m3, s;
|
|
float *r0, *r1, *r2, *r3;
|
|
|
|
r0 = wtmp[0], r1 = wtmp[1], r2 = wtmp[2], r3 = wtmp[3];
|
|
|
|
r0[0] = MAT(m,0,0), r0[1] = MAT(m,0,1),
|
|
r0[2] = MAT(m,0,2), r0[3] = MAT(m,0,3),
|
|
r0[4] = 1.0, r0[5] = r0[6] = r0[7] = 0.0,
|
|
|
|
r1[0] = MAT(m,1,0), r1[1] = MAT(m,1,1),
|
|
r1[2] = MAT(m,1,2), r1[3] = MAT(m,1,3),
|
|
r1[5] = 1.0, r1[4] = r1[6] = r1[7] = 0.0,
|
|
|
|
r2[0] = MAT(m,2,0), r2[1] = MAT(m,2,1),
|
|
r2[2] = MAT(m,2,2), r2[3] = MAT(m,2,3),
|
|
r2[6] = 1.0, r2[4] = r2[5] = r2[7] = 0.0,
|
|
|
|
r3[0] = MAT(m,3,0), r3[1] = MAT(m,3,1),
|
|
r3[2] = MAT(m,3,2), r3[3] = MAT(m,3,3),
|
|
r3[7] = 1.0, r3[4] = r3[5] = r3[6] = 0.0;
|
|
|
|
// choose pivot - or die
|
|
if (fabs(r3[0])>fabs(r2[0])) SWAP_ROWS(r3, r2);
|
|
if (fabs(r2[0])>fabs(r1[0])) SWAP_ROWS(r2, r1);
|
|
if (fabs(r1[0])>fabs(r0[0])) SWAP_ROWS(r1, r0);
|
|
// if (0.0 == r0[0]) return GL_FALSE;
|
|
|
|
// eliminate first variable
|
|
m1 = r1[0]/r0[0]; m2 = r2[0]/r0[0]; m3 = r3[0]/r0[0];
|
|
s = r0[1]; r1[1] -= m1 * s; r2[1] -= m2 * s; r3[1] -= m3 * s;
|
|
s = r0[2]; r1[2] -= m1 * s; r2[2] -= m2 * s; r3[2] -= m3 * s;
|
|
s = r0[3]; r1[3] -= m1 * s; r2[3] -= m2 * s; r3[3] -= m3 * s;
|
|
s = r0[4];
|
|
if (s != 0.0) { r1[4] -= m1 * s; r2[4] -= m2 * s; r3[4] -= m3 * s; }
|
|
s = r0[5];
|
|
if (s != 0.0) { r1[5] -= m1 * s; r2[5] -= m2 * s; r3[5] -= m3 * s; }
|
|
s = r0[6];
|
|
if (s != 0.0) { r1[6] -= m1 * s; r2[6] -= m2 * s; r3[6] -= m3 * s; }
|
|
s = r0[7];
|
|
if (s != 0.0) { r1[7] -= m1 * s; r2[7] -= m2 * s; r3[7] -= m3 * s; }
|
|
|
|
// choose pivot - or die
|
|
if (fabs(r3[1])>fabs(r2[1])) SWAP_ROWS(r3, r2);
|
|
if (fabs(r2[1])>fabs(r1[1])) SWAP_ROWS(r2, r1);
|
|
// if (0.0 == r1[1]) return GL_FALSE;
|
|
|
|
// eliminate second variable
|
|
m2 = r2[1]/r1[1]; m3 = r3[1]/r1[1];
|
|
r2[2] -= m2 * r1[2]; r3[2] -= m3 * r1[2];
|
|
r2[3] -= m2 * r1[3]; r3[3] -= m3 * r1[3];
|
|
s = r1[4]; if (0.0 != s) { r2[4] -= m2 * s; r3[4] -= m3 * s; }
|
|
s = r1[5]; if (0.0 != s) { r2[5] -= m2 * s; r3[5] -= m3 * s; }
|
|
s = r1[6]; if (0.0 != s) { r2[6] -= m2 * s; r3[6] -= m3 * s; }
|
|
s = r1[7]; if (0.0 != s) { r2[7] -= m2 * s; r3[7] -= m3 * s; }
|
|
|
|
// choose pivot - or die
|
|
if (fabs(r3[2])>fabs(r2[2])) SWAP_ROWS(r3, r2);
|
|
// if (0.0 == r2[2]) return GL_FALSE;
|
|
|
|
// eliminate third variable
|
|
m3 = r3[2]/r2[2];
|
|
r3[3] -= m3 * r2[3], r3[4] -= m3 * r2[4],
|
|
r3[5] -= m3 * r2[5], r3[6] -= m3 * r2[6],
|
|
r3[7] -= m3 * r2[7];
|
|
|
|
// last check
|
|
// if (0.0 == r3[3]) return GL_FALSE;
|
|
|
|
s = 1.0f/r3[3]; // now back substitute row 3
|
|
r3[4] *= s; r3[5] *= s; r3[6] *= s; r3[7] *= s;
|
|
|
|
m2 = r2[3]; // now back substitute row 2
|
|
s = 1.0f/r2[2];
|
|
r2[4] = s * (r2[4] - r3[4] * m2), r2[5] = s * (r2[5] - r3[5] * m2),
|
|
r2[6] = s * (r2[6] - r3[6] * m2), r2[7] = s * (r2[7] - r3[7] * m2);
|
|
m1 = r1[3];
|
|
r1[4] -= r3[4] * m1, r1[5] -= r3[5] * m1,
|
|
r1[6] -= r3[6] * m1, r1[7] -= r3[7] * m1;
|
|
m0 = r0[3];
|
|
r0[4] -= r3[4] * m0, r0[5] -= r3[5] * m0,
|
|
r0[6] -= r3[6] * m0, r0[7] -= r3[7] * m0;
|
|
|
|
m1 = r1[2]; // now back substitute row 1
|
|
s = 1.0f/r1[1];
|
|
r1[4] = s * (r1[4] - r2[4] * m1), r1[5] = s * (r1[5] - r2[5] * m1),
|
|
r1[6] = s * (r1[6] - r2[6] * m1), r1[7] = s * (r1[7] - r2[7] * m1);
|
|
m0 = r0[2];
|
|
r0[4] -= r2[4] * m0, r0[5] -= r2[5] * m0,
|
|
r0[6] -= r2[6] * m0, r0[7] -= r2[7] * m0;
|
|
|
|
m0 = r0[1]; // now back substitute row 0
|
|
s = 1.0f/r0[0];
|
|
r0[4] = s * (r0[4] - r1[4] * m0), r0[5] = s * (r0[5] - r1[5] * m0),
|
|
r0[6] = s * (r0[6] - r1[6] * m0), r0[7] = s * (r0[7] - r1[7] * m0);
|
|
|
|
lcVector4 Row0(r0[4], r1[4], r2[4], r3[4]);
|
|
lcVector4 Row1(r0[5], r1[5], r2[5], r3[5]);
|
|
lcVector4 Row2(r0[6], r1[6], r2[6], r3[6]);
|
|
lcVector4 Row3(r0[7], r1[7], r2[7], r3[7]);
|
|
|
|
lcMatrix44 out(Row0, Row1, Row2, Row3);
|
|
|
|
return out;
|
|
|
|
#undef MAT
|
|
#undef SWAP_ROWS
|
|
}
|
|
|
|
// Convert world coordinates to screen coordinates.
|
|
inline lcVector3 lcProjectPoint(const lcVector3& Point, const lcMatrix44& ModelView, const lcMatrix44& Projection, const int Viewport[4])
|
|
{
|
|
lcVector4 Tmp;
|
|
|
|
Tmp = lcMul4(lcVector4(Point[0], Point[1], Point[2], 1.0f), ModelView);
|
|
Tmp = lcMul4(Tmp, Projection);
|
|
|
|
// Normalize.
|
|
Tmp /= Tmp[3];
|
|
|
|
// Screen coordinates.
|
|
return lcVector3(Viewport[0] + (1 + Tmp[0]) * Viewport[2] / 2, Viewport[1] + (1 + Tmp[1]) * Viewport[3] / 2, (1 + Tmp[2]) / 2);
|
|
}
|
|
|
|
inline lcVector3 lcUnprojectPoint(const lcVector3& Point, const lcMatrix44& ModelView, const lcMatrix44& Projection, const int Viewport[4])
|
|
{
|
|
// Calculate the screen to model transform.
|
|
lcMatrix44 Transform = lcMatrix44Inverse(lcMul(ModelView, Projection));
|
|
|
|
lcVector4 Tmp;
|
|
|
|
// Convert the point to homogeneous coordinates.
|
|
Tmp[0] = (Point[0] - Viewport[0]) * 2.0f / Viewport[2] - 1.0f;
|
|
Tmp[1] = (Point[1] - Viewport[1]) * 2.0f / Viewport[3] - 1.0f;
|
|
Tmp[2] = Point[2] * 2.0f - 1.0f;
|
|
Tmp[3] = 1.0f;
|
|
|
|
Tmp = lcMul4(Tmp, Transform);
|
|
|
|
if (Tmp[3] != 0.0f)
|
|
Tmp /= Tmp[3];
|
|
|
|
return lcVector3(Tmp[0], Tmp[1], Tmp[2]);
|
|
}
|
|
|
|
inline void lcUnprojectPoints(lcVector3* Points, int NumPoints, const lcMatrix44& ModelView, const lcMatrix44& Projection, const int Viewport[4])
|
|
{
|
|
// Calculate the screen to model transform.
|
|
lcMatrix44 Transform = lcMatrix44Inverse(lcMul(ModelView, Projection));
|
|
|
|
for (int i = 0; i < NumPoints; i++)
|
|
{
|
|
lcVector4 Tmp;
|
|
|
|
// Convert the point to homogeneous coordinates.
|
|
Tmp[0] = (Points[i][0] - Viewport[0]) * 2.0f / Viewport[2] - 1.0f;
|
|
Tmp[1] = (Points[i][1] - Viewport[1]) * 2.0f / Viewport[3] - 1.0f;
|
|
Tmp[2] = Points[i][2] * 2.0f - 1.0f;
|
|
Tmp[3] = 1.0f;
|
|
|
|
Tmp = lcMul4(Tmp, Transform);
|
|
|
|
if (Tmp[3] != 0.0f)
|
|
Tmp /= Tmp[3];
|
|
|
|
Points[i] = lcVector3(Tmp[0], Tmp[1], Tmp[2]);
|
|
}
|
|
}
|
|
|
|
inline void lcGetFrustumPlanes(const lcMatrix44& WorldView, const lcMatrix44& Projection, lcVector4 Planes[6])
|
|
{
|
|
lcMatrix44 WorldProj = lcMul(WorldView, Projection);
|
|
|
|
Planes[0][0] = (WorldProj[0][0] - WorldProj[0][3]) * -1;
|
|
Planes[0][1] = (WorldProj[1][0] - WorldProj[1][3]) * -1;
|
|
Planes[0][2] = (WorldProj[2][0] - WorldProj[2][3]) * -1;
|
|
Planes[0][3] = (WorldProj[3][0] - WorldProj[3][3]) * -1;
|
|
Planes[1][0] = WorldProj[0][0] + WorldProj[0][3];
|
|
Planes[1][1] = WorldProj[1][0] + WorldProj[1][3];
|
|
Planes[1][2] = WorldProj[2][0] + WorldProj[2][3];
|
|
Planes[1][3] = WorldProj[3][0] + WorldProj[3][3];
|
|
Planes[2][0] = (WorldProj[0][1] - WorldProj[0][3]) * -1;
|
|
Planes[2][1] = (WorldProj[1][1] - WorldProj[1][3]) * -1;
|
|
Planes[2][2] = (WorldProj[2][1] - WorldProj[2][3]) * -1;
|
|
Planes[2][3] = (WorldProj[3][1] - WorldProj[3][3]) * -1;
|
|
Planes[3][0] = WorldProj[0][1] + WorldProj[0][3];
|
|
Planes[3][1] = WorldProj[1][1] + WorldProj[1][3];
|
|
Planes[3][2] = WorldProj[2][1] + WorldProj[2][3];
|
|
Planes[3][3] = WorldProj[3][1] + WorldProj[3][3];
|
|
Planes[4][0] = (WorldProj[0][2] - WorldProj[0][3]) * -1;
|
|
Planes[4][1] = (WorldProj[1][2] - WorldProj[1][3]) * -1;
|
|
Planes[4][2] = (WorldProj[2][2] - WorldProj[2][3]) * -1;
|
|
Planes[4][3] = (WorldProj[3][2] - WorldProj[3][3]) * -1;
|
|
Planes[5][0] = WorldProj[0][2] + WorldProj[0][3];
|
|
Planes[5][1] = WorldProj[1][2] + WorldProj[1][3];
|
|
Planes[5][2] = WorldProj[2][2] + WorldProj[2][3];
|
|
Planes[5][3] = WorldProj[3][2] + WorldProj[3][3];
|
|
|
|
for (int i = 0; i < 6; i++)
|
|
{
|
|
lcVector3 Normal(Planes[i][0], Planes[i][1], Planes[i][2]);
|
|
float Len = Normal.Length();
|
|
Planes[i] /= -Len;
|
|
}
|
|
}
|
|
|
|
inline lcVector3 lcZoomExtents(const lcVector3& Position, const lcMatrix44& WorldView, const lcMatrix44& Projection, const lcVector3* Points, int NumPoints)
|
|
{
|
|
if (!NumPoints)
|
|
return Position;
|
|
|
|
lcVector4 Planes[6];
|
|
lcGetFrustumPlanes(WorldView, Projection, Planes);
|
|
|
|
lcVector3 Front(WorldView[0][2], WorldView[1][2], WorldView[2][2]);
|
|
|
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// Calculate the position that is as close as possible to the model and has all pieces visible.
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float SmallestDistance = FLT_MAX;
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for (int p = 0; p < 4; p++)
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{
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lcVector3 Plane(Planes[p][0], Planes[p][1], Planes[p][2]);
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float ep = lcDot(Position, Plane);
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float fp = lcDot(Front, Plane);
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for (int j = 0; j < NumPoints; j++)
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{
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// Intersect the camera line with the plane that contains this point, NewEye = Eye + u * (Target - Eye)
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float u = (ep - lcDot(Points[j], Plane)) / fp;
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if (u < SmallestDistance)
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SmallestDistance = u;
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}
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}
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return Position - (Front * SmallestDistance);
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}
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#endif // _LC_MATH_H_
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