| 12 |
|
|
| 13 |
|
#include "mat4.h" |
| 14 |
|
|
| 15 |
+ |
MAT4 m4ident = MAT4IDENT; |
| 16 |
+ |
|
| 17 |
|
static MAT4 m4tmp; /* for efficiency */ |
| 18 |
|
|
| 19 |
|
|
| 18 |
– |
setident4(m4) |
| 19 |
– |
MAT4 m4; |
| 20 |
– |
{ |
| 21 |
– |
static MAT4 ident = { |
| 22 |
– |
1.,0.,0.,0., |
| 23 |
– |
0.,1.,0.,0., |
| 24 |
– |
0.,0.,1.,0., |
| 25 |
– |
0.,0.,0.,1., |
| 26 |
– |
}; |
| 27 |
– |
copymat4(m4, ident); |
| 28 |
– |
} |
| 29 |
– |
|
| 30 |
– |
|
| 20 |
|
multmat4(m4a, m4b, m4c) /* multiply m4b X m4c and put into m4a */ |
| 21 |
|
MAT4 m4a; |
| 22 |
|
register MAT4 m4b, m4c; |
| 61 |
|
} |
| 62 |
|
|
| 63 |
|
|
| 75 |
– |
#ifdef INVMAT |
| 64 |
|
/* |
| 65 |
|
* invmat - computes the inverse of mat into inverse. Returns 1 |
| 66 |
|
* if there exists an inverse, 0 otherwise. It uses Gaussian Elimination |
| 77 |
|
register double temp; |
| 78 |
|
|
| 79 |
|
copymat4(m4tmp, mat); |
| 80 |
< |
setident(inverse); |
| 80 |
> |
setident4(inverse); |
| 81 |
|
|
| 82 |
|
for(i = 0; i < 4; i++) { |
| 83 |
|
/* Look for row with largest pivot and swap rows */ |
| 115 |
|
#undef ABS |
| 116 |
|
#undef SWAP |
| 117 |
|
} |
| 130 |
– |
#endif |
