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eina: add eina_matrix4_normalized.

This commit is contained in:
Cedric BAIL 2015-06-24 17:23:23 +02:00
parent 4f0f81bb30
commit 694149c773
2 changed files with 44 additions and 0 deletions
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29
src/lib/eina/eina_matrix.c
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@ -23,6 +23,7 @@
#include "eina_private.h"
#include <math.h>
#include <float.h>
#include "eina_fp.h"
#include "eina_rectangle.h"
@ -723,3 +724,31 @@ eina_matrix4_determinant(const Eina_Matrix4 *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);
}
EAPI Eina_Bool
eina_matrix4_normalized(Eina_Matrix4 *out, const Eina_Matrix4 *in)
{
double det;
det = eina_matrix4_determinant(in);
if (fabs(det) < DBL_EPSILON) return EINA_FALSE;
MATRIX_XX(out) = MATRIX_XX(in) / det;
MATRIX_XY(out) = MATRIX_XY(in) / det;
MATRIX_XZ(out) = MATRIX_XZ(in) / det;
MATRIX_XW(out) = MATRIX_XW(in) / det;
MATRIX_YX(out) = MATRIX_YX(in) / det;
MATRIX_YY(out) = MATRIX_YY(in) / det;
MATRIX_YZ(out) = MATRIX_YZ(in) / det;
MATRIX_YW(out) = MATRIX_YW(in) / det;
MATRIX_ZX(out) = MATRIX_ZX(in) / det;
MATRIX_ZY(out) = MATRIX_ZY(in) / det;
MATRIX_ZZ(out) = MATRIX_ZZ(in) / det;
MATRIX_ZW(out) = MATRIX_ZW(in) / det;
MATRIX_WX(out) = MATRIX_WX(in) / det;
MATRIX_WY(out) = MATRIX_WY(in) / det;
MATRIX_WZ(out) = MATRIX_WZ(in) / det;
MATRIX_WW(out) = MATRIX_WW(in) / det;
return EINA_TRUE;
}

15
src/lib/eina/eina_matrix.h
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@ -524,6 +524,21 @@ EAPI void eina_matrix4_values_get(const Eina_Matrix4 *m,
*/
EAPI double eina_matrix4_determinant(const Eina_Matrix4 *m);
/**
* @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 Eina_Bool eina_matrix4_normalized(Eina_Matrix4 *out,
const Eina_Matrix4 *in);
/**
* @brief Convert an Eina_Matrix4 into an Eina_Matrix3.
*