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use std::collections::HashMap;
use std::rc::Rc;
use rustc_serialize::{Decodable, Decoder};
use animation::{AnimationClip, ClipInstance};
use transform::Transform;
pub type ClipId = String;
pub type ParamId = String;
#[derive(Debug, Clone)]
pub enum BlendTreeNodeDef {
LerpNode(Box<BlendTreeNodeDef>, Box<BlendTreeNodeDef>, ParamId),
AdditiveNode(Box<BlendTreeNodeDef>, Box<BlendTreeNodeDef>, ParamId),
ClipNode(ClipId),
}
impl Decodable for BlendTreeNodeDef {
fn decode<D: Decoder>(decoder: &mut D) -> Result<BlendTreeNodeDef, D::Error> {
decoder.read_struct("root", 0, |decoder| {
let node_type = try!(decoder.read_struct_field("type", 0, |decoder| { Ok(try!(decoder.read_str())) }));
match &node_type[..] {
"LerpNode" => {
let (input_1, input_2) = try!(decoder.read_struct_field("inputs", 0, |decoder| {
decoder.read_seq(|decoder, _len| {
Ok((
try!(decoder.read_seq_elt(0, Decodable::decode)),
try!(decoder.read_seq_elt(1, Decodable::decode))
))
})
}));
let blend_param_name = try!(decoder.read_struct_field("param", 0, |decoder| { Ok(try!(decoder.read_str())) }));
Ok(BlendTreeNodeDef::LerpNode(Box::new(input_1), Box::new(input_2), blend_param_name))
},
"AdditiveNode" => {
let (input_1, input_2) = try!(decoder.read_struct_field("inputs", 0, |decoder| {
decoder.read_seq(|decoder, _len| {
Ok((
try!(decoder.read_seq_elt(0, Decodable::decode)),
try!(decoder.read_seq_elt(1, Decodable::decode))
))
})
}));
let blend_param_name = try!(decoder.read_struct_field("param", 0, |decoder| { Ok(try!(decoder.read_str())) }));
Ok(BlendTreeNodeDef::AdditiveNode(Box::new(input_1), Box::new(input_2), blend_param_name))
},
"ClipNode" => {
let clip_source = try!(decoder.read_struct_field("clip_source", 0, |decoder| { Ok(try!(decoder.read_str())) }));
Ok(BlendTreeNodeDef::ClipNode(clip_source))
}
_ => panic!("Unexpected blend node type")
}
})
}
}
pub struct AnimBlendTree<T: Transform> {
root_node: AnimNodeHandle,
lerp_nodes: Vec<LerpAnimNode>,
additive_nodes: Vec<AdditiveAnimNode>,
clip_nodes: Vec<ClipAnimNode<T>>,
}
impl<T: Transform> AnimBlendTree<T> {
pub fn from_def(
def: BlendTreeNodeDef,
animations: &HashMap<ClipId, Rc<AnimationClip<T>>>
) -> AnimBlendTree<T> {
let mut tree = AnimBlendTree {
root_node: AnimNodeHandle::None,
lerp_nodes: Vec::new(),
additive_nodes: Vec::new(),
clip_nodes: Vec::new(),
};
tree.root_node = tree.add_node(def, animations);
tree
}
pub fn get_output_pose(&self, time: f32, params: &HashMap<String, f32>, output_poses: &mut [T]) {
if let Some(ref node) = self.get_node(self.root_node.clone()) {
node.get_output_pose(self, time, params, output_poses);
}
}
pub fn synchronize(&mut self, global_time: f32, params: &HashMap<String, f32>) {
for lerp_node in self.lerp_nodes.iter() {
if let (AnimNodeHandle::ClipAnimNodeHandle(clip_1), AnimNodeHandle::ClipAnimNodeHandle(clip_2)) = (lerp_node.input_1.clone(), lerp_node.input_2.clone()) {
let blend_parameter = params[&lerp_node.blend_param[..]];
let target_length = {
let clip_1 = &self.clip_nodes[clip_1].clip;
let clip_2 = &self.clip_nodes[clip_2].clip;
let length_1 = clip_1.get_duration();
let length_2 = clip_2.get_duration();
(1.0 - blend_parameter) * length_1 + blend_parameter * length_2
};
{
let clip_1 = &mut self.clip_nodes[clip_1].clip;
let length = clip_1.get_duration();
clip_1.set_playback_rate(global_time, length / target_length);
}
{
let clip_2 = &mut self.clip_nodes[clip_2].clip;
let length = clip_2.get_duration();
clip_2.set_playback_rate(global_time, length / target_length);
}
}
}
}
fn add_node(
&mut self,
def: BlendTreeNodeDef,
animations: &HashMap<ClipId, Rc<AnimationClip<T>>>
) -> AnimNodeHandle {
match def {
BlendTreeNodeDef::LerpNode(input_1, input_2, param_id) => {
let input_1_handle = self.add_node(*input_1, animations);
let input_2_handle = self.add_node(*input_2, animations);
self.lerp_nodes.push(LerpAnimNode {
input_1: input_1_handle,
input_2: input_2_handle,
blend_param: param_id.clone()
});
AnimNodeHandle::LerpAnimNodeHandle(self.lerp_nodes.len() - 1)
}
BlendTreeNodeDef::AdditiveNode(input_1, input_2, param_id) => {
let input_1_handle = self.add_node(*input_1, animations);
let input_2_handle = self.add_node(*input_2, animations);
self.additive_nodes.push(AdditiveAnimNode {
base_input: input_1_handle,
additive_input: input_2_handle,
blend_param: param_id.clone()
});
AnimNodeHandle::AdditiveAnimNodeHandle(self.additive_nodes.len() - 1)
}
BlendTreeNodeDef::ClipNode(clip_id) => {
let clip = animations.get(&clip_id[..]).expect(&format!("Missing animation clip: {}", clip_id)[..]);
self.clip_nodes.push(ClipAnimNode {
clip: ClipInstance::new(clip.clone())
});
AnimNodeHandle::ClipAnimNodeHandle(self.clip_nodes.len() - 1)
}
}
}
fn get_node(&self, handle: AnimNodeHandle) -> Option<&AnimNode<T>> {
match handle {
AnimNodeHandle::LerpAnimNodeHandle(i) => Some(&self.lerp_nodes[i]),
AnimNodeHandle::AdditiveAnimNodeHandle(i) => Some(&self.additive_nodes[i]),
AnimNodeHandle::ClipAnimNodeHandle(i) => Some(&self.clip_nodes[i]),
AnimNodeHandle::None => None,
}
}
}
pub trait AnimNode<T: Transform> {
fn get_output_pose(&self, tree: &AnimBlendTree<T>, time: f32, params: &HashMap<String, f32>, output_poses: &mut [T]);
}
#[derive(Clone)]
pub enum AnimNodeHandle {
None,
LerpAnimNodeHandle(usize),
AdditiveAnimNodeHandle(usize),
ClipAnimNodeHandle(usize),
}
pub struct LerpAnimNode {
input_1: AnimNodeHandle,
input_2: AnimNodeHandle,
blend_param: ParamId
}
impl<T: Transform> AnimNode<T> for LerpAnimNode {
fn get_output_pose(&self, tree: &AnimBlendTree<T>, time: f32, params: &HashMap<String, f32>, output_poses: &mut [T]) {
let mut input_poses = [ T::identity(); 64 ];
let sample_count = output_poses.len();
let blend_parameter = params[&self.blend_param[..]];
if let Some(ref node) = tree.get_node(self.input_1.clone()) {
node.get_output_pose(tree, time, params, &mut input_poses[0 .. sample_count]);
}
if let Some(ref node) = tree.get_node(self.input_2.clone()) {
node.get_output_pose(tree, time, params, output_poses);
}
for i in (0 .. output_poses.len()) {
let pose_1 = input_poses[i];
let pose_2 = &mut output_poses[i];
(*pose_2) = pose_1.lerp(pose_2.clone(), blend_parameter);
}
}
}
pub struct AdditiveAnimNode {
base_input: AnimNodeHandle,
additive_input: AnimNodeHandle,
blend_param: ParamId
}
impl<T: Transform> AnimNode<T> for AdditiveAnimNode {
fn get_output_pose(&self, tree: &AnimBlendTree<T>, time: f32, params: &HashMap<String, f32>, output_poses: &mut [T]) {
let mut input_poses = [ T::identity(); 64 ];
let sample_count = output_poses.len();
let blend_parameter = params[&self.blend_param[..]];
if let Some(ref node) = tree.get_node(self.base_input.clone()) {
node.get_output_pose(tree, time, params, &mut input_poses[0 .. sample_count]);
}
if let Some(ref node) = tree.get_node(self.additive_input.clone()) {
node.get_output_pose(tree, time, params, output_poses);
}
for i in (0 .. output_poses.len()) {
let pose_1 = input_poses[i];
let pose_2 = &mut output_poses[i];
let additive_pose = T::identity().lerp(pose_2.clone(), blend_parameter);
(*pose_2) = pose_1.concat(additive_pose);
}
}
}
pub struct ClipAnimNode<T: Transform> {
clip: ClipInstance<T>
}
impl<T: Transform> AnimNode<T> for ClipAnimNode<T> {
fn get_output_pose(&self, _tree: &AnimBlendTree<T>, time: f32, _params: &HashMap<String, f32>, output_poses: &mut [T]) {
self.clip.get_pose_at_time(time, output_poses);
}
}