prime-forge 0.3.21

Forged in Lost Lands is a simple game engine built in Rust that focuses on data control and ease of use
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

use std::{
    cell::RefCell,
    rc::{Rc, Weak},
};

use crate::lost_realm::LostRealm;

use super::EtherealFlow;

use nalgebra_glm as glm;

pub trait ForgedTrait: ForgedHierarchy {
    #[allow(unused_variables)]
    fn start(&mut self, lost_realm: &mut LostRealm) {}
    #[allow(unused_variables)]
    fn update(&mut self, lost_realm: &mut LostRealm, dt: f32) {}
}

pub trait ForgedHierarchy: EtherealFlow {
    fn set_father(&mut self, father_id: String);
    fn get_father(&self) -> Option<String>;
}

pub struct TransformSpecialTrait {
    pub position: glm::Vec3,
    pub rotation: glm::Vec3,
    pub scale: glm::Vec3,
    id: uuid::Uuid,
    parent: Option<Weak<RefCell<TransformSpecialTrait>>>,
    children: Vec<Rc<RefCell<TransformSpecialTrait>>>,
    pub model_matrix: glm::Mat4,
}

impl Default for TransformSpecialTrait {
    fn default() -> Self {
        Self {
            position: glm::vec3(0.0, 0.0, 0.0),
            rotation: glm::vec3(0.0, 0.0, 0.0),
            scale: glm::vec3(1.0, 1.0, 1.0),
            children: Vec::new(),
            parent: None,
            model_matrix: glm::Mat4::identity(),
            id: uuid::Uuid::new_v4(),
        }
    }
}

impl TransformSpecialTrait {
    pub fn new() -> Self {
        Self {
            ..Default::default()
        }
    }

    pub fn with_position(mut self, position: glm::Vec3) -> Self {
        self.position = position;
        self.update_self_and_children();
        self
    }

    pub fn with_rotation(mut self, rotation: glm::Vec3) -> Self {
        self.rotation = rotation;
        self.update_self_and_children();
        self
    }

    pub fn with_scale(mut self, scale: glm::Vec3) -> Self {
        self.scale = scale;
        self.update_self_and_children();
        self
    }

    pub(crate) fn set_parent(&mut self, parent: Rc<RefCell<TransformSpecialTrait>>) {
        if let Some(parent) = self.get_parent() {
            parent
                .borrow_mut()
                .children
                .retain(|child| child.borrow().id != self.id);
        }
        self.parent = Some(Rc::downgrade(&parent));
    }

    pub(crate) fn set_children(&mut self, children: Vec<Rc<RefCell<TransformSpecialTrait>>>) {
        if children.len() > 0 {
            self.children.extend(children.iter().cloned());
        } else {
            self.children = children;
        }
    }

    pub fn get_parent(&self) -> Option<Rc<RefCell<TransformSpecialTrait>>> {
        self.parent.as_ref().and_then(|parent| parent.upgrade())
    }

    pub fn get_children(&self) -> Vec<Rc<RefCell<TransformSpecialTrait>>> {
        self.children.clone()
    }

    pub fn get_local_model_matrix(&self) -> glm::Mat4 {
        let transform_x = glm::rotate(
            &glm::Mat4::identity(),
            self.rotation.x.to_radians(),
            &glm::vec3(1.0, 0.0, 0.0),
        );

        let transform_y = glm::rotate(
            &glm::Mat4::identity(),
            self.rotation.y.to_radians(),
            &glm::vec3(0.0, 1.0, 0.0),
        );

        let transform_z = glm::rotate(
            &glm::Mat4::identity(),
            self.rotation.z.to_radians(),
            &glm::vec3(0.0, 0.0, 1.0),
        );

        let rotation = transform_x * transform_y * transform_z;

        let model = glm::Mat4::identity();
        let model = glm::translate(&model, &self.position);
        let model = model * rotation;
        let model = glm::scale(&model, &self.scale);

        model
    }

    pub fn update_self_and_children(&mut self) {
        self.model_matrix = if let Some(parent) = self.get_parent() {
            let parent = unsafe {
                let ptr = parent.as_ptr() as *const TransformSpecialTrait;
                &*ptr
            };
            parent.model_matrix * self.get_local_model_matrix()
        } else {
            self.get_local_model_matrix()
        };

        println!("Model Matrix: {:?}", self.model_matrix);

        for child in self.children.iter() {
            child.borrow_mut().update_self_and_children();
        }
    }
}