Node tree

src/gameobject.rs

@@ -1,5 +1,34 @@
 use nalgebra_glm as glm;
 
+use crate::model::Model;
+
+pub struct Node {
+    pub name: String,
+    pub gameobject: GameObject,
+    pub children: Vec<Node>,
+}
+
+impl Node {
+    pub fn new(name: String, gameobject: GameObject) -> Self {
+	Node {
+	    name,
+	    gameobject,
+	    children: Vec::new(),
+	}
+    }
+    pub fn add_child(&mut self, child: Node) {
+	self.children.push(child)
+    }
+    pub fn find_node(&mut self, name: &str) -> Option<&mut Node> {
+	self.children.iter_mut().find(|node| node.name == name)
+    }
+}
+
+pub enum GameObject {
+    Null,
+    Mesh(Box<Mesh>),
+}
+
 #[derive(Clone, Copy)]
 pub struct Transform {
     pub position: glm::Vec3,
@@ -16,8 +45,31 @@ impl Default for Transform {
 	}
     }
 }
-    
+
 pub trait Spatial {
     fn get_transform(&self) -> Transform;
     fn set_transform(&mut self, transform: Transform);
 }
+
+pub struct Mesh {
+    pub model: Model,
+    transform: Transform,
+}
+
+impl Mesh {
+    pub fn new(model: Model) -> Self {
+	Mesh {
+	    model,
+	    transform: Default::default(),
+	}
+    }
+}
+
+impl Spatial for Mesh {
+    fn get_transform(&self) -> Transform {
+	self.transform
+    }
+    fn set_transform(&mut self, transform: Transform) {
+	self.transform = transform;
+    }
+}

src/main.rs

@@ -11,7 +11,7 @@ use model::Model;
 
 use scripting::{ ScriptLang, Lua };
 
-use gameobject::Spatial;
+use gameobject::{ Spatial, Mesh, Node, GameObject };
 
 fn main() {
     use glium::{glutin, Surface};
@@ -30,12 +30,15 @@ fn main() {
 
     let mut device_manager = crate::device::DeviceManager::new();
 
-    let mut cube = Model::new(&display, "Box.glb");
+    let mut root = Node::new("_root_".to_string(), GameObject::Null);
+    
+    let mut cube = Mesh::new(Model::new(&display, "Box.glb"));
     cube.set_transform(gameobject::Transform {
 	position: glm::vec3(0.0, 0.0, -10.0),
 	rotation: glm::vec3(0.0, 15.0_f32.to_radians(), 0.0),
 	scale: glm::vec3(1.0, 1.0, 1.0),
     });
+    root.add_child(Node::new("cube".to_string(), GameObject::Mesh(Box::new(cube))));
 	
     let mut script_lang = Lua::new();
     script_lang.init();
@@ -60,27 +63,7 @@ fn main() {
 		let delta = (now - last_draw).as_secs_f32();
 		last_draw = now;
 
-		let mut transform = cube.get_transform();
-		if device_manager.is_pressed(&device::Key::W) {
-		    transform.position.z += 1.0 * delta;
-		} else if device_manager.is_pressed(&device::Key::S) {
-		    transform.position.z -= 1.0 * delta;
-		}
-		if device_manager.is_pressed(&device::Key::A) {
-		    transform.rotation.x += 1.0 * delta;
-		} else if device_manager.is_pressed(&device::Key::D) {
-		    transform.rotation.x -= 1.0 * delta;
-		}
-		cube.set_transform(transform);
-
 		script_lang.update(delta);
-		
-		let mvp = glm::perspective::<f32>(4.0/3.0, 45.0_f32.to_radians(), 0.2, 100.0);
-		let mvp = glm::translate::<f32>(&mvp, &cube.get_transform().position);
-		let mvp = glm::rotate_x(&mvp, cube.get_transform().rotation.x);
-		let uniforms = uniform! {
-		    MVP: *mvp.as_ref(),
-		};
 
 		let mut target = display.draw();
 		let params = glium::DrawParameters {
@@ -93,7 +76,32 @@ fn main() {
 		    .. Default::default()
 		};
 		target.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
-		cube.draw(&mut target, &program, &uniforms, &params);
+		
+		let cube: &mut Node = root.find_node("cube").unwrap();
+		if let GameObject::Mesh(cube) = &mut cube.gameobject {
+		    let mut transform = cube.get_transform();
+		    if device_manager.is_pressed(&device::Key::W) {
+			transform.position.z += 1.0 * delta;
+		    } else if device_manager.is_pressed(&device::Key::S) {
+			transform.position.z -= 1.0 * delta;
+		    }
+		    if device_manager.is_pressed(&device::Key::A) {
+			transform.rotation.x += 1.0 * delta;
+		    } else if device_manager.is_pressed(&device::Key::D) {
+			transform.rotation.x -= 1.0 * delta;
+		    }
+		    cube.set_transform(transform);
+		    let mvp = glm::perspective::<f32>(4.0/3.0, 45.0_f32.to_radians(), 0.2, 100.0);
+		    let mvp = glm::translate::<f32>(&mvp, &cube.get_transform().position);
+		    let mvp = glm::rotate_x(&mvp, cube.get_transform().rotation.x);
+
+		    
+		    
+		    let uniforms = uniform! {
+			MVP: *mvp.as_ref(),
+		    };
+		    cube.model.draw(&mut target, &program, &uniforms, &params);
+		}
 		target.finish().unwrap();
 	    }
 	    _ => (),

src/model.rs

@@ -1,7 +1,5 @@
 extern crate gltf;
 
-use crate::gameobject::*;
-
 use glium::{ VertexBuffer, IndexBuffer };
 
 #[derive(Copy, Clone)]
@@ -15,7 +13,6 @@ implement_vertex!(Vertex, position, normal);
 pub struct Model {
     vb: VertexBuffer<Vertex>,
     ib: IndexBuffer<u32>,
-    transform: Transform,
 }
 
 impl Model {
@@ -36,9 +33,7 @@ impl Model {
 	let indices: Vec<u32> = reader.read_indices().unwrap().into_u32().collect();
 	let ib = IndexBuffer::new(display, glium::index::PrimitiveType::TrianglesList, &indices).unwrap();
 
-	let transform = Default::default();
-	
-	Model { vb, ib, transform }
+	Model { vb, ib }
     }
 
     pub fn draw(&self,
@@ -50,12 +45,3 @@ impl Model {
 	target.draw(&self.vb, &self.ib, program, uniforms, params).unwrap()
     }
 }
-
-impl Spatial for Model {
-    fn get_transform(&self) -> Transform {
-	self.transform
-    }
-    fn set_transform(&mut self, transform: Transform) {
-	self.transform = transform;
-    }
-}