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///////////////////////////////////////////////////////////////////////////////////////////////////
// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
///////////////////////////////////////////////////////////////////////////////////////////////////
// Created : 2011-03-05
// Updated : 2011-03-05
// Licence : This source is under MIT License
// File : glm/gtx/matrix_interpolation.inl
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace glm{
namespace gtx{
namespace matrix_interpolation
{
template <typename T>
GLM_FUNC_QUALIFIER void axisAngle(
detail::tmat4x4<T> const & mat,
detail::tvec3<T> & axis,
T & angle)
{
T epsilon = (T)0.01;
T epsilon2 = (T)0.1;
if ((fabs(mat[1][0] - mat[0][1]) < epsilon) && (fabs(mat[2][0] - mat[0][2]) < epsilon) && (fabs(mat[2][1] - mat[1][2]) < epsilon)) {
if ((fabs(mat[1][0] + mat[0][1]) < epsilon2) && (fabs(mat[2][0] + mat[0][2]) < epsilon2) && (fabs(mat[2][1] + mat[1][2]) < epsilon2) && (fabs(mat[0][0] + mat[1][1] + mat[2][2] - (T)3.0) < epsilon2)) {
angle = (T)0.0;
axis.x = (T)1.0;
axis.y = (T)0.0;
axis.z = (T)0.0;
return;
}
angle = M_1_PI;
T xx = (mat[0][0] + (T)1.0) / (T)2.0;
T yy = (mat[1][1] + (T)1.0) / (T)2.0;
T zz = (mat[2][2] + (T)1.0) / (T)2.0;
T xy = (mat[1][0] + mat[0][1]) / (T)4.0;
T xz = (mat[2][0] + mat[0][2]) / (T)4.0;
T yz = (mat[2][1] + mat[1][2]) / (T)4.0;
if ((xx > yy) && (xx > zz)) {
if (xx < epsilon) {
axis.x = (T)0.0;
axis.y = (T)0.7071;
axis.z = (T)0.7071;
} else {
axis.x = sqrt(xx);
axis.y = xy / axis.x;
axis.z = xz / axis.x;
}
} else if (yy > zz) {
if (yy < epsilon) {
axis.x = (T)0.7071;
axis.y = (T)0.0;
axis.z = (T)0.7071;
} else {
axis.y = sqrt(yy);
axis.x = xy / axis.y;
axis.z = yz / axis.y;
}
} else {
if (zz < epsilon) {
axis.x = (T)0.7071;
axis.y = (T)0.7071;
axis.z = (T)0.0;
} else {
axis.z = sqrt(zz);
axis.x = xz / axis.z;
axis.y = yz / axis.z;
}
}
return;
}
T s = sqrt((mat[2][1] - mat[1][2]) * (mat[2][1] - mat[1][2]) + (mat[2][0] - mat[0][2]) * (mat[2][0] - mat[0][2]) + (mat[1][0] - mat[0][1]) * (mat[1][0] - mat[0][1]));
if (glm::abs(s) < T(0.001))
s = (T)1.0;
angle = acos((mat[0][0] + mat[1][1] + mat[2][2] - (T)1.0) / (T)2.0);
axis.x = (mat[1][2] - mat[2][1]) / s;
axis.y = (mat[2][0] - mat[0][2]) / s;
axis.z = (mat[0][1] - mat[1][0]) / s;
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tmat4x4<T> axisAngleMatrix(
detail::tvec3<T> const & axis,
T const angle)
{
T c = cos(angle);
T s = sin(angle);
T t = T(1) - c;
detail::tvec3<T> n = normalize(axis);
return detail::tmat4x4<T>(
t * n.x * n.x + c, t * n.x * n.y + n.z * s, t * n.x * n.z - n.y * s, T(0),
t * n.x * n.y - n.z * s, t * n.y * n.y + c, t * n.y * n.z + n.x * s, T(0),
t * n.x * n.z + n.y * s, t * n.y * n.z - n.x * s, t * n.z * n.z + c, T(0),
T(0), T(0), T(0), T(1)
);
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tmat4x4<T> interpolate(
detail::tmat4x4<T> const & m1,
detail::tmat4x4<T> const & m2,
T const delta)
{
detail::tmat4x4<T> dltRotation = m2 * transpose(m1);
detail::tvec3<T> dltAxis;
T dltAngle;
axisAngle(dltRotation, dltAxis, dltAngle);
detail::tmat4x4<T> out = axisAngleMatrix(dltAxis, dltAngle * delta) * rotationMatrix(m1);
out[3][0] = m1[3][0] + delta * (m2[3][0] - m1[3][0]);
out[3][1] = m1[3][1] + delta * (m2[3][1] - m1[3][1]);
out[3][2] = m1[3][2] + delta * (m2[3][2] - m1[3][2]);
return out;
}
}//namespace transform
}//namespace gtx
}//namespace glm
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