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Matrix2f.invert() returns null on failure

This commit is contained in:
Elias Naur 2003-08-12 10:38:11 +00:00
parent f348be1033
commit 1af7c6ba6d
1 changed files with 15 additions and 12 deletions
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17
src/java/org/lwjgl/vector/Matrix2f.java
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@ -291,7 +291,7 @@ public class Matrix2f extends Matrix implements Serializable {
/** /**
* Invert this matrix * Invert this matrix
* @return this * @return this if successful, null otherwise
*/ */
public Matrix invert() public Matrix invert()
{ {
@ -300,18 +300,21 @@ public class Matrix2f extends Matrix implements Serializable {
inv(A) = 1/det(A) * adj(A); inv(A) = 1/det(A) * adj(A);
*/ */
float determinant = m00 * m11 - m01*m10; float determinant = determinant();
float t00 = m11/determinant; if (determinant != 0) {
float t01 = -m01/determinant; float determinant_inv = 1f/determinant;
float t11 = m00/determinant; float t00 = m11*determinant_inv;
float t10 = -m10/determinant; float t01 = -m01*determinant_inv;
float t11 = m00*determinant_inv;
float t10 = -m10*determinant_inv;
m00 = t00; m00 = t00;
m01 = t01; m01 = t01;
m10 = t10; m10 = t10;
m11 = t11; m11 = t11;
return this; return this;
} else
return null;
} }
/** /**