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Optimized Matrix4f.invert()

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This commit is contained in:
Elias Naur 2003-08-12 09:33:02 +00:00
parent 7b01e92f0a
commit b7510958c7
1 changed files with 17 additions and 16 deletions
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33
src/java/org/lwjgl/vector/Matrix4f.java
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@ -717,6 +717,7 @@ public class Matrix4f extends Matrix implements Serializable {
m20 m21 m22 m23
m30 m31 m32 m33
*/
float determinant_inv = 1f/determinant;
// first row
float t00 = determinant3x3( m11, m12, m13, m21, m22, m23, m31, m32, m33 );
@ -740,22 +741,22 @@ public class Matrix4f extends Matrix implements Serializable {
float t33 = determinant3x3( m00, m01, m02, m10, m11, m12, m20, m21, m22 );
// transpose and divide by the determinant
m00 = t00/determinant;
m11 = t11/determinant;
m22 = t22/determinant;
m33 = t33/determinant;
m01 = t10/determinant;
m10 = t01/determinant;
m20 = t02/determinant;
m02 = t20/determinant;
m12 = t21/determinant;
m21 = t12/determinant;
m03 = t30/determinant;
m30 = t03/determinant;
m13 = t31/determinant;
m31 = t13/determinant;
m32 = t23/determinant;
m23 = t32/determinant;
m00 = t00*determinant_inv;
m11 = t11*determinant_inv;
m22 = t22*determinant_inv;
m33 = t33*determinant_inv;
m01 = t10*determinant_inv;
m10 = t01*determinant_inv;
m20 = t02*determinant_inv;
m02 = t20*determinant_inv;
m12 = t21*determinant_inv;
m21 = t12*determinant_inv;
m03 = t30*determinant_inv;
m30 = t03*determinant_inv;
m13 = t31*determinant_inv;
m31 = t13*determinant_inv;
m32 = t23*determinant_inv;
m23 = t32*determinant_inv;
}
return this;
}