55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*
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* Created by Brett on 09/01/23.
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* Licensed under GNU General Public License V3.0
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* See LICENSE file for license detail
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*/
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#ifndef BLT_MATH_H
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#define BLT_MATH_H
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#include <blt/math/vectors.h>
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#include <blt/math/matrix.h>
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namespace blt {
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constexpr float EPSILON = 0.0001f;
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static inline constexpr bool f_equal(float v1, float v2) {
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return v1 >= v2 - EPSILON && v1 <= v2 + EPSILON;
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}
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/**
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* fast number integer
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*/
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static inline unsigned int f_randi(unsigned int seed) {
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seed = (seed << 13) ^ seed;
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return ((seed * (seed * seed * 15731 + 789221) + 1376312589) & 0x7fffffff);
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}
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/**
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* fast inverse sqrt
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*/
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static inline float fsqrt(float n){
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int i;
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float x, y;
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x = n * 0.5f;
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y = n;
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i = * (int*) &y;
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i = 0x5f3759df - (i >> 1);
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y = * (float*) &i;
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y = y * (1.5f - (x * y * y));
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y = y * (1.5f - (x * y * y));
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return y;
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}
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// inline std::ostream& operator<<(std::ostream& out, const mat4x4& v) {
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// return out << "\rMatrix4x4{" << v.m00() << ", " << v.m01() << ", " << v.m02() << ", " << v.m03() << "} \n"\
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// << " {" << v.m10() << ", " << v.m11() << ", " << v.m12() << ", " << v.m13() << "} \n"\
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// << " {" << v.m20() << ", " << v.m21() << ", " << v.m22() << ", " << v.m23() << "} \n"\
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// << " {" << v.m30() << ", " << v.m31() << ", " << v.m32() << ", " << v.m33() << "} \n";
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// }
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}
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#endif //BLT_MATH_H
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