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mat3x3: add matrix inverse

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This commit is contained in:
Zack Buhman 2025-07-21 13:52:25 -05:00
parent c55c0e21a9
commit 1f5fdcc197
1 changed files with 17 additions and 0 deletions
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17
math/mat3x3.hpp
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@ -184,3 +184,20 @@ inline constexpr float determinant(mat<3, 3, T> const& a)
a[0][1] * f1 + a[0][1] * f1 +
a[0][2] * f2; a[0][2] * f2;
} }
template<typename T>
inline constexpr mat<3, 3, T> inverse(mat<3, 3, T> const& a)
{
mat<3, 3, T> m;
float idet = 1.0f / determinant(a);
m[0][0] = cofactor(a, 0, 0) * idet;
m[1][0] = cofactor(a, 0, 1) * idet;
m[2][0] = cofactor(a, 0, 2) * idet;
m[0][1] = cofactor(a, 1, 0) * idet;
m[1][1] = cofactor(a, 1, 1) * idet;
m[2][1] = cofactor(a, 1, 2) * idet;
m[0][2] = cofactor(a, 2, 0) * idet;
m[1][2] = cofactor(a, 2, 1) * idet;
m[2][2] = cofactor(a, 2, 2) * idet;
return m;
}