cedric pushed a commit to branch master.
http://git.enlightenment.org/core/efl.git/commit/?id=4f0f81bb30f33b8e5f72008c2cf2ef438d5283e6
commit 4f0f81bb30f33b8e5f72008c2cf2ef438d5283e6
Author: Cedric BAIL <ced...@osg.samsung.com>
Date: Wed Jun 24 16:56:26 2015 +0200
eina: add eina_matrix4_determinant.
---
src/lib/eina/eina_matrix.c | 30 ++++++++++++++++++++++++++++++
src/lib/eina/eina_matrix.h | 13 +++++++++++++
2 files changed, 43 insertions(+)
diff --git a/src/lib/eina/eina_matrix.c b/src/lib/eina/eina_matrix.c
index 6c96893..2e994df 100644
--- a/src/lib/eina/eina_matrix.c
+++ b/src/lib/eina/eina_matrix.c
@@ -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);
+}
diff --git a/src/lib/eina/eina_matrix.h b/src/lib/eina/eina_matrix.h
index 83fff16..8dc7014 100644
--- a/src/lib/eina/eina_matrix.h
+++ b/src/lib/eina/eina_matrix.h
@@ -512,6 +512,19 @@ EAPI void eina_matrix4_values_get(const Eina_Matrix4 *m,
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.
*
* @param m3 The destination Eina_Matrix3.
--
