godot/thirdparty/bullet/BulletInverseDynamics/details/MultiBodyTreeInitCache.cpp

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#include "MultiBodyTreeInitCache.hpp"
namespace btInverseDynamics
{
MultiBodyTree::InitCache::InitCache()
{
m_inertias.resize(0);
m_joints.resize(0);
m_num_dofs = 0;
m_root_index = -1;
}
int MultiBodyTree::InitCache::addBody(const int body_index, const int parent_index,
const JointType joint_type,
const vec3& parent_r_parent_body_ref,
const mat33& body_T_parent_ref,
const vec3& body_axis_of_motion, const idScalar mass,
const vec3& body_r_body_com, const mat33& body_I_body,
const int user_int, void* user_ptr)
{
switch (joint_type)
{
case REVOLUTE:
case PRISMATIC:
m_num_dofs += 1;
break;
case FIXED:
// does not add a degree of freedom
// m_num_dofs+=0;
break;
case SPHERICAL:
m_num_dofs += 3;
break;
case FLOATING:
m_num_dofs += 6;
break;
default:
bt_id_error_message("unknown joint type %d\n", joint_type);
return -1;
}
if (-1 == parent_index)
{
if (m_root_index >= 0)
{
bt_id_error_message("trying to add body %d as root, but already added %d as root body\n",
body_index, m_root_index);
return -1;
}
m_root_index = body_index;
}
JointData joint;
joint.m_child = body_index;
joint.m_parent = parent_index;
joint.m_type = joint_type;
joint.m_parent_pos_parent_child_ref = parent_r_parent_body_ref;
joint.m_child_T_parent_ref = body_T_parent_ref;
joint.m_child_axis_of_motion = body_axis_of_motion;
InertiaData body;
body.m_mass = mass;
body.m_body_pos_body_com = body_r_body_com;
body.m_body_I_body = body_I_body;
m_inertias.push_back(body);
m_joints.push_back(joint);
m_user_int.push_back(user_int);
m_user_ptr.push_back(user_ptr);
return 0;
}
int MultiBodyTree::InitCache::getInertiaData(const int index, InertiaData* inertia) const
{
if (index < 0 || index > static_cast<int>(m_inertias.size()))
{
bt_id_error_message("index out of range\n");
return -1;
}
*inertia = m_inertias[index];
return 0;
}
int MultiBodyTree::InitCache::getUserInt(const int index, int* user_int) const
{
if (index < 0 || index > static_cast<int>(m_user_int.size()))
{
bt_id_error_message("index out of range\n");
return -1;
}
*user_int = m_user_int[index];
return 0;
}
int MultiBodyTree::InitCache::getUserPtr(const int index, void** user_ptr) const
{
if (index < 0 || index > static_cast<int>(m_user_ptr.size()))
{
bt_id_error_message("index out of range\n");
return -1;
}
*user_ptr = m_user_ptr[index];
return 0;
}
int MultiBodyTree::InitCache::getJointData(const int index, JointData* joint) const
{
if (index < 0 || index > static_cast<int>(m_joints.size()))
{
bt_id_error_message("index out of range\n");
return -1;
}
*joint = m_joints[index];
return 0;
}
int MultiBodyTree::InitCache::buildIndexSets()
{
// NOTE: This function assumes that proper indices were provided
// User2InternalIndex from utils can be used to facilitate this.
m_parent_index.resize(numBodies());
for (idArrayIdx j = 0; j < m_joints.size(); j++)
{
const JointData& joint = m_joints[j];
m_parent_index[joint.m_child] = joint.m_parent;
}
return 0;
}
} // namespace btInverseDynamics