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use rinecs::{WriteAndParent, ReadNot, Not};
use super::{DynamicTransformation, Bone };
use rin::graphics::{Node, NodeMut, NodeRef, node};
use na::{one, Pnt3, UnitQuat, Vec3};
use serde::ser::Serialize;

#[derive(Clone, HierarchicalComponent, Debug, Serialize, Deserialize)]
#[debug_custom]
pub struct Transformation{
    pub node: Node,
    pub parent_bone: Option<String>,
    pub is_bone: bool,
    has_changed: bool,
}

impl rinecs::DebugParameter for Transformation{
    fn debug<S: serde::Serializer>(&self, serializer: S) -> Result<<S as serde::Serializer>::Ok, <S as serde::Serializer>::Error>{
        #[derive(Serialize)]
        struct Position{
            x: f32,
            y: f32,
            z: f32,
        }

        #[derive(Serialize)]
        struct Orientation{
            x: f32,
            y: f32,
            z: f32,
            w: f32,
        }

        #[derive(Serialize)]
        struct Scale{
            x: f32,
            y: f32,
            z: f32,
        }


        #[derive(Serialize)]
        struct Transformation{
            position: Position,
            orientation: Orientation,
            scale: Scale,
            global_position: Position,
            global_orientation: Orientation,
            global_scale: Scale,
        }

        let p = self.position();
        let q = self.orientation();
        let s = self.scale();

        let gp = self.global_position();
        let gq = self.global_orientation();
        let gs = self.global_scale();

        Transformation{
            position: Position{
                x: p[0], y: p[1], z: p[2]
            },
            orientation: Orientation{
                x: q[0], y: q[1], z: q[2], w: q[3]
            },
            scale: Scale{
                x: s.x, y: s.y, z: s.z
            },
            global_position: Position{
                x: gp[0], y: gp[1], z: gp[2]
            },
            global_orientation: Orientation{
                x: gq[0], y: gq[1], z: gq[2], w: gq[3]
            },
            global_scale: Scale{
                x: gs.x, y: gs.y, z: gs.z
            },
        }.serialize(serializer)
    }
}

impl Default for Transformation{
    fn default() -> Transformation{
        Transformation{ node: one(), parent_bone: None, is_bone: false, has_changed: false,}
    }
}

impl Transformation{
    pub fn new(pos: Pnt3, rot: UnitQuat, scale: Vec3) -> Transformation{
        Transformation{ node: Node::new(pos, rot, scale), parent_bone: None, is_bone: false, has_changed: false,}
    }

    pub fn from_position(pos: Pnt3) -> Transformation{
        Transformation{ node: Node::new(pos, one(), vec3!(1.)), parent_bone: None, is_bone: false, has_changed: false,}
    }

    // pub fn from_axis_angle(axis: &Unit<Vec3>, angle: Rad<f32>) -> Transformation{
    //     Transformation(graphics::Node::new(origin(), UnitQuat::from_axis_angle(axis, angle.value()), vec3!(1.)))
    // }

    pub fn from_node(node: Node) -> Transformation{
        Transformation{ node: node, parent_bone: None, is_bone: false, has_changed: false,}
    }

    pub fn from_node_parent_bone(node: Node, parent_bone: String) -> Transformation{
        Transformation{ node, parent_bone: Some(parent_bone), is_bone: false, has_changed: false,}
    }

    pub fn has_changed(&self) -> bool{
        self.has_changed
    }

    pub fn into_parameter(&self) -> String{
        let pos = self.node.global_position();
        let quat = self.node.global_orientation().into_inner();
        let scale = self.node.global_scale();
format!("Transformation {{
    position: Pnt3 {{
        x: {},
        y: {},
        z: {},
    }},
    orientation: UnitQuat {{
        x: {},
        y: {},
        z: {},
        w: {},
    }},
    scale: Vec3 {{
        x: {},
        y: {},
        z: {},
    }}
}}", pos.x, pos.y, pos.z,
    quat.coords.x, quat.coords.y, quat.coords.z, quat.coords.w,
    scale.x, scale.y, scale.z)
    }
}

impl NodeRef for Transformation{
    fn node(&self) -> &Node{
        &self.node
    }
}

impl NodeMut for Transformation{
    fn node_mut(&mut self) -> &mut Node{
        &mut self.node
    }

    fn update_with_parent_flags(&mut self, parent: Option<&Node>, flags: node::Flags) -> bool{
        self.has_changed |= self.node.update_with_parent_flags(parent, flags);
        self.has_changed
    }
}

pub fn update_dynamic(entities: rinecs::Entities, _: rinecs::Resources){
    for ((trafo, parent), _) in entities.ordered_iter_for::<(WriteAndParent<Transformation>, ReadNot<DynamicTransformation, Bone>)>(){
        // trafo.set_position(&pnt3!(1.));
        trafo.has_changed = false;
        trafo.update_with_parent(parent.map(|t| &t.node));
    }
}

pub fn update_static(entities: rinecs::Entities, _: rinecs::Resources){
    for ((trafo, parent), _) in entities.ordered_iter_for::<(WriteAndParent<Transformation>, Not<DynamicTransformation>)>(){
        trafo.has_changed = false;
        trafo.update_with_parent(parent.map(|t| &t.node));
    }
}

pub fn update_all(entities: rinecs::Entities, _: rinecs::Resources){
    for ((trafo, parent), _) in entities.ordered_iter_for::<(WriteAndParent<Transformation>, Not<Bone>)>(){
        // Bone transformations are set when updating the bones
        // updating them here would get an incorrect transformation
        // since the hierarchy chain includes the animated and original
        // nodes
        trafo.has_changed = false;
        trafo.update_with_parent(parent.map(|t| &t.node));
    }
}