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/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* invmat4 - computes the inverse of mat into inverse. Returns 1 |
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* if there exists an inverse, 0 otherwise. It uses Gaussian Elimination |
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* method. |
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*/ |
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#include "copyright.h" |
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#include "mat4.h" |
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#define SWAP(a,b,t) (t=a,a=b,b=t) |
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invmat4(inverse,mat) |
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int |
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invmat4(inverse, mat) |
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MAT4 inverse, mat; |
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{ |
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MAT4 m4tmp; |
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copymat4(m4tmp, mat); |
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/* set inverse to identity */ |
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for (i = 0; i < 4; i++) |
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for (j = 0; j < 4; j++) |
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inverse[i][j] = i==j ? 1.0 : 0.0; |
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setident4(inverse); |
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for(i = 0; i < 4; i++) { |
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/* Look for row with largest pivot and swap rows */ |
