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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1990 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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* 10/19/85 |
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*/ |
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#include "mat4.h" |
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static double m4tmp[4][4]; /* for efficiency */ |
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MAT4 m4ident = MAT4IDENT; |
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#define copymat4(m4a,m4b) bcopy((char *)m4b,(char *)m4a,sizeof(m4tmp)) |
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static MAT4 m4tmp; /* for efficiency */ |
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setident4(m4) |
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double m4[4][4]; |
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{ |
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static double ident[4][4] = { |
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1.,0.,0.,0., |
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0.,1.,0.,0., |
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0.,0.,1.,0., |
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0.,0.,0.,1., |
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}; |
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copymat4(m4, ident); |
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} |
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multmat4(m4a, m4b, m4c) /* multiply m4b X m4c and put into m4a */ |
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double m4a[4][4]; |
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register double m4b[4][4], m4c[4][4]; |
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MAT4 m4a; |
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register MAT4 m4b, m4c; |
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{ |
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register int i, j; |
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multv3(v3a, v3b, m4) /* transform vector v3b by m4 and put into v3a */ |
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double v3a[3]; |
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register double v3b[3]; |
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register double m4[4][4]; |
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FVECT v3a; |
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register FVECT v3b; |
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register MAT4 m4; |
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{ |
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m4tmp[0][0] = v3b[0]*m4[0][0] + v3b[1]*m4[1][0] + v3b[2]*m4[2][0]; |
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m4tmp[0][1] = v3b[0]*m4[0][1] + v3b[1]*m4[1][1] + v3b[2]*m4[2][1]; |
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multp3(p3a, p3b, m4) /* transform p3b by m4 and put into p3a */ |
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register double p3a[3]; |
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double p3b[3]; |
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register double m4[4][4]; |
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register FVECT p3a; |
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FVECT p3b; |
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register MAT4 m4; |
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{ |
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multv3(p3a, p3b, m4); /* transform as vector */ |
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p3a[0] += m4[3][0]; /* translate */ |
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} |
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#ifdef INVMAT |
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/* |
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* invmat - 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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*/ |
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invmat(inverse,mat) |
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double mat[4][4],inverse[4][4]; |
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MAT4 mat, inverse; |
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{ |
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#define SWAP(a,b,t) (t=a,a=b,b=t) |
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#define ABS(x) (x>=0?x:-(x)) |
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register double temp; |
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copymat4(m4tmp, mat); |
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setident(inverse); |
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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 */ |
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#undef ABS |
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#undef SWAP |
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} |
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#endif |
