kimcinoo
/
efl
forked from enlightenment/efl
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

eina: add eina_matrix4_determinant.

This commit is contained in:
Cedric BAIL 2015-06-24 16:56:26 +02:00
parent c82015d062
commit 4f0f81bb30
2 changed files with 43 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
src/lib/eina/eina_matrix.c
View File

@ -693,3 +693,33 @@ eina_matrix3_matrix4_to(Eina_Matrix4 *m4, const Eina_Matrix3 *m3)
MATRIX_WZ(m4) = 0;
MATRIX_WW(m4) = MATRIX_ZZ(m3);
}
EAPI double
eina_matrix4_determinant(const Eina_Matrix4 *m)
{
return
MATRIX_XW(m) * MATRIX_YZ(m) * MATRIX_ZY(m) * MATRIX_WX(m)
- MATRIX_XZ(m) * MATRIX_YW(m) * MATRIX_ZY(m) * MATRIX_WX(m)
- MATRIX_XW(m) * MATRIX_YY(m) * MATRIX_ZZ(m) * MATRIX_WX(m)
+ MATRIX_XY(m) * MATRIX_YW(m) * MATRIX_ZZ(m) * MATRIX_WX(m)
+ MATRIX_XZ(m) * MATRIX_YY(m) * MATRIX_ZW(m) * MATRIX_WX(m)
- MATRIX_XY(m) * MATRIX_YZ(m) * MATRIX_ZW(m) * MATRIX_WX(m)
- MATRIX_XW(m) * MATRIX_YZ(m) * MATRIX_ZX(m) * MATRIX_WY(m)
+ MATRIX_XZ(m) * MATRIX_YW(m) * MATRIX_ZX(m) * MATRIX_WY(m)
+ MATRIX_XW(m) * MATRIX_YX(m) * MATRIX_ZZ(m) * MATRIX_WY(m)
- MATRIX_XX(m) * MATRIX_YW(m) * MATRIX_ZZ(m) * MATRIX_WY(m)
- MATRIX_XZ(m) * MATRIX_YX(m) * MATRIX_ZW(m) * MATRIX_WY(m)
+ MATRIX_XX(m) * MATRIX_YZ(m) * MATRIX_ZW(m) * MATRIX_WY(m)
+ MATRIX_XW(m) * MATRIX_YY(m) * MATRIX_ZX(m) * MATRIX_WZ(m)
- MATRIX_XY(m) * MATRIX_YW(m) * MATRIX_ZX(m) * MATRIX_WZ(m)
- MATRIX_XW(m) * MATRIX_YX(m) * MATRIX_ZY(m) * MATRIX_WZ(m)
+ MATRIX_XX(m) * MATRIX_YW(m) * MATRIX_ZY(m) * MATRIX_WZ(m)
+ MATRIX_XY(m) * MATRIX_YX(m) * MATRIX_ZW(m) * MATRIX_WZ(m)
- MATRIX_XX(m) * MATRIX_YY(m) * MATRIX_ZW(m) * MATRIX_WZ(m)
- MATRIX_XZ(m) * MATRIX_YY(m) * MATRIX_ZX(m) * MATRIX_WW(m)
+ MATRIX_XY(m) * MATRIX_YZ(m) * MATRIX_ZX(m) * MATRIX_WW(m)
+ MATRIX_XZ(m) * MATRIX_YX(m) * MATRIX_ZY(m) * MATRIX_WW(m)
- MATRIX_XX(m) * MATRIX_YZ(m) * MATRIX_ZY(m) * MATRIX_WW(m)
- MATRIX_XY(m) * MATRIX_YX(m) * MATRIX_ZZ(m) * MATRIX_WW(m)
+ MATRIX_XX(m) * MATRIX_YY(m) * MATRIX_ZZ(m) * MATRIX_WW(m);
}

13
src/lib/eina/eina_matrix.h
View File

@ -511,6 +511,19 @@ EAPI void eina_matrix4_values_get(const Eina_Matrix4 *m,
double *zx, double *zy, double *zz, double *zw,
double *wx, double *wy, double *wz, double *ww);
/**
* @brief Return the determinant of the given matrix.
*
* @param m The matrix.
* @return The determinant.
*
* This function returns the determinant of the matrix @p m. No check
* is done on @p m.
*
* @since 1.15
*/
EAPI double eina_matrix4_determinant(const Eina_Matrix4 *m);
/**
* @brief Convert an Eina_Matrix4 into an Eina_Matrix3.
*