cyb/evy/forks/naga/src/back/wgsl/polyfill/inverse/inverse_3x3_f32.wgsl

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fn _naga_inverse_3x3_f32(m: mat3x3<f32>) -> mat3x3<f32> {
    var adj: mat3x3<f32>;

    adj[0][0] =   (m[1][1] * m[2][2] - m[2][1] * m[1][2]);
    adj[1][0] = - (m[1][0] * m[2][2] - m[2][0] * m[1][2]);
    adj[2][0] =   (m[1][0] * m[2][1] - m[2][0] * m[1][1]);
    adj[0][1] = - (m[0][1] * m[2][2] - m[2][1] * m[0][2]);
    adj[1][1] =   (m[0][0] * m[2][2] - m[2][0] * m[0][2]);
    adj[2][1] = - (m[0][0] * m[2][1] - m[2][0] * m[0][1]);
    adj[0][2] =   (m[0][1] * m[1][2] - m[1][1] * m[0][2]);
    adj[1][2] = - (m[0][0] * m[1][2] - m[1][0] * m[0][2]);
    adj[2][2] =   (m[0][0] * m[1][1] - m[1][0] * m[0][1]);

    let det: f32 = (m[0][0] * (m[1][1] * m[2][2] - m[1][2] * m[2][1])
    		- m[0][1] * (m[1][0] * m[2][2] - m[1][2] * m[2][0])
    		+ m[0][2] * (m[1][0] * m[2][1] - m[1][1] * m[2][0]));

    return adj * (1 / det);
}

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