wip: timelines

src/body.rs

@@ -0,0 +1,321 @@
+use crate::instruction::TimedInstruction;
+
+pub enum PhysicsInstruction {
+	CollisionStart(RelativeCollision),
+	CollisionEnd(RelativeCollision),
+	StrafeTick,
+	Jump,
+	SetWalkTargetVelocity(glam::Vec3),
+	ReachWalkTargetVelocity,
+	// Water,
+	// Spawn(
+	// 	Option<SpawnId>,
+	// 	bool,//true = Trigger; false = teleport
+	// 	bool,//true = Force
+	// )
+}
+
+pub struct Body {
+	pub position: glam::Vec3,//I64 where 2^32 = 1 u
+	pub velocity: glam::Vec3,//I64 where 2^32 = 1 u/s
+	pub time: TIME,//nanoseconds x xxxxD!
+}
+
+pub enum MoveRestriction {
+    Air,
+    Water,
+    Ground,
+    Ladder,//multiple ladders how
+}
+
+pub struct PhysicsState {
+	pub body: Body,
+	pub contacts: Vec<RelativeCollision>,
+	pub models_cringe_clone: Vec<Model>,
+	pub time: TIME,
+	pub strafe_tick_num: TIME,
+	pub strafe_tick_den: TIME,
+	pub tick: u32,
+	pub mv: f32,
+	pub walkspeed: f32,
+	pub friction: f32,
+	pub gravity: glam::Vec3,
+	pub grounded: bool,
+	pub jump_trying: bool,
+}
+
+#[derive(Clone,Copy)]
+pub enum AabbFace{
+	Right,//+X
+	Top,
+	Back,
+	Left,
+	Bottom,
+	Front,
+}
+
+pub struct Aabb {
+	min: glam::Vec3,
+	max: glam::Vec3,
+}
+
+impl Aabb {
+	// const FACE_DATA: [[f32; 3]; 6] = [
+	// 	[0.0f32, 0., 1.],
+	// 	[0.0f32, 0., -1.],
+	// 	[1.0f32, 0., 0.],
+	// 	[-1.0f32, 0., 0.],
+	// 	[0.0f32, 1., 0.],
+	// 	[0.0f32, -1., 0.],
+	// ];
+	const VERTEX_DATA_RIGHT: [glam::Vec3; 4] = [
+		glam::vec3(1., -1., -1.),
+		glam::vec3(1., 1., -1.),
+		glam::vec3(1., 1., 1.),
+		glam::vec3(1., -1., 1.),
+	];
+	const VERTEX_DATA_TOP: [glam::Vec3; 4] = [
+		glam::vec3(1., 1., -1.),
+		glam::vec3(-1., 1., -1.),
+		glam::vec3(-1., 1., 1.),
+		glam::vec3(1., 1., 1.),
+	];
+	const VERTEX_DATA_BACK: [glam::Vec3; 4] = [
+		glam::vec3(-1., -1., 1.),
+		glam::vec3(1., -1., 1.),
+		glam::vec3(1., 1., 1.),
+		glam::vec3(-1., 1., 1.),
+	];
+	const VERTEX_DATA_LEFT: [glam::Vec3; 4] = [
+		glam::vec3(-1., -1., 1.),
+		glam::vec3(-1., 1., 1.),
+		glam::vec3(-1., 1., -1.),
+		glam::vec3(-1., -1., -1.),
+	];
+	const VERTEX_DATA_BOTTOM: [glam::Vec3; 4] = [
+		glam::vec3(1., -1., 1.),
+		glam::vec3(-1., -1., 1.),
+		glam::vec3(-1., -1., -1.),
+		glam::vec3(1., -1., -1.),
+	];
+	const VERTEX_DATA_FRONT: [glam::Vec3; 4] = [
+		glam::vec3(-1., 1., -1.),
+		glam::vec3(1., 1., -1.),
+		glam::vec3(1., -1., -1.),
+		glam::vec3(-1., -1., -1.),
+	];
+
+	pub fn new() -> Self {
+		Self {min: glam::Vec3::INFINITY,max: glam::Vec3::NEG_INFINITY}
+	}
+
+	pub fn grow(&mut self, point:glam::Vec3){
+		self.min=self.min.min(point);
+		self.max=self.max.max(point);
+	}
+
+	pub fn normal(face:AabbFace) -> glam::Vec3 {
+		match face {
+			AabbFace::Right => glam::vec3(1.,0.,0.),
+			AabbFace::Top => glam::vec3(0.,1.,0.),
+			AabbFace::Back => glam::vec3(0.,0.,1.),
+			AabbFace::Left => glam::vec3(-1.,0.,0.),
+			AabbFace::Bottom => glam::vec3(0.,-1.,0.),
+			AabbFace::Front => glam::vec3(0.,0.,-1.),
+		}
+	}
+	pub fn face_vertices(face:AabbFace) -> [glam::Vec3;4] {
+		match face {
+			AabbFace::Right => Self::VERTEX_DATA_RIGHT,
+			AabbFace::Top => Self::VERTEX_DATA_TOP,
+			AabbFace::Back => Self::VERTEX_DATA_BACK,
+			AabbFace::Left => Self::VERTEX_DATA_LEFT,
+			AabbFace::Bottom => Self::VERTEX_DATA_BOTTOM,
+			AabbFace::Front => Self::VERTEX_DATA_FRONT,
+		}
+	}
+}
+
+type Face = AabbFace;
+type TreyMesh = Aabb;
+
+pub struct Model {
+	//A model is a thing that has a hitbox. can be represented by a list of TreyMesh-es
+	//in this iteration, all it needs is extents.
+	transform: glam::Mat4,
+}
+
+impl Model {
+	pub fn new(transform:glam::Mat4) -> Self {
+		Self{transform}
+	}
+	pub fn face_vertices(&self,face:Face) -> [glam::Vec3;4] {
+		Aabb::face_vertices(face)
+	}
+	pub fn face_mesh(&self,face:Face) -> TreyMesh {
+		let mut aabb=Aabb::new();
+		for &vertex in self.face_vertices(face).iter() {
+			aabb.grow(vertex);
+		}
+		return aabb;
+	}
+	pub fn face_normal(&self,face:Face) -> glam::Vec3 {
+		let mut n=glam::Vec3Swizzles::xyzz(Aabb::normal(face));
+		n.w=0.0;//what a man will do to avoid writing out the components
+		glam::Vec4Swizzles::xyz(self.transform*n)//this is wrong for scale
+	}
+}
+
+pub struct RelativeCollision {
+	face: Face,//just an id
+	model: u32,//using id to avoid lifetimes
+}
+
+impl RelativeCollision {
+	pub fn mesh(&self,models:&Vec<Model>) -> TreyMesh {
+		return models.get(self.model as usize).unwrap().face_mesh(self.face)
+	}
+	pub fn normal(&self,models:&Vec<Model>) -> glam::Vec3 {
+		return models.get(self.model as usize).unwrap().face_normal(self.face)
+	}
+}
+
+pub type TIME = i64;
+
+const CONTROL_JUMP:u32 = 0b01000000;//temp DATA NORMALIZATION!@#$
+impl PhysicsState {
+	//delete this, we are tickless gamers
+	pub fn run(&mut self, time: TIME){
+		//prepare is ommitted - everything is done via instructions.
+		while let Some(instruction) = self.next_instruction() {//collect
+			if time<instruction.time {
+				break;
+			}
+			//advance
+			self.advance_time(instruction.time);
+			//process
+			self.process_instruction(instruction);
+			//write hash lol
+		}
+
+	}
+
+	//delete this
+	pub fn extrapolate_position(&self, time: TIME) -> glam::Vec3 {
+		let dt=(time-self.body.time) as f64/1_000_000_000f64;
+		self.body.position+self.body.velocity*(dt as f32)+self.gravity*((0.5*dt*dt) as f32)
+	}
+
+	fn next_strafe_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
+		return Some(TimedInstruction{
+			time:(self.time*self.strafe_tick_num/self.strafe_tick_den+1)*self.strafe_tick_den/self.strafe_tick_num,
+			//only poll the physics if there is a before and after mouse event
+			instruction:PhysicsInstruction::StrafeTick
+		});
+	}
+
+	//state mutated on collision:
+	//Accelerator
+	//stair step-up
+
+	//state mutated on instruction
+	//change fly acceleration (fly_sustain)
+	//change fly velocity
+
+	//generic event emmiters
+	//PlatformStandTime
+	//walk/swim/air/ladder sounds
+	//VState?
+
+	//falling under the map
+	// fn next_respawn_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
+	// 	if self.body.position<self.world.min_y {
+	// 		return Some(TimedInstruction{
+	// 			time:self.time,
+	// 			instruction:PhysicsInstruction::Trigger(None)
+	// 		});
+	// 	}
+	// }
+
+	// fn next_water_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
+	// 	return Some(TimedInstruction{
+	// 		time:(self.time*self.strafe_tick_num/self.strafe_tick_den+1)*self.strafe_tick_den/self.strafe_tick_num,
+	// 		//only poll the physics if there is a before and after mouse event
+	// 		instruction:PhysicsInstruction::Water
+	// 	});
+	// }
+
+	fn next_walk_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
+		//check if you are accelerating towards a walk target velocity and create an instruction
+		return None;
+	}
+	fn predict_collision_end(&self,model:&Model) -> Option<TimedInstruction<PhysicsInstruction>> {
+		//must treat cancollide false objects differently: you may not exit through the same face you entered.
+		None
+	}
+	fn predict_collision_start(&self,model:&Model) -> Option<TimedInstruction<PhysicsInstruction>> {
+		None
+	}
+}
+
+impl crate::instruction::InstructionEmitter<PhysicsInstruction> for PhysicsState {
+	//this little next instruction function can cache its return value and invalidate the cached value by watching the State.
+	fn next_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
+		//JUST POLLING!!! NO MUTATION
+		let mut collector = crate::instruction::InstructionCollector::new();
+		//autohop (already pressing spacebar; the signal to begin trying to jump is different)
+		if self.grounded&&self.jump_trying {
+			//scroll will be implemented with InputInstruction::Jump(true) but it blocks setting self.jump_trying=true
+			collector.collect(Some(TimedInstruction{
+				time:self.time,
+				instruction:PhysicsInstruction::Jump
+			}));
+		}
+		//check for collision stop instructions with curent contacts
+		for collision_data in self.contacts.iter() {
+			collector.collect(self.predict_collision_end(self.models_cringe_clone.get(collision_data.model as usize).unwrap()));
+		}
+		//check for collision start instructions (against every part in the game with no optimization!!)
+		for model in &self.models_cringe_clone {
+			collector.collect(self.predict_collision_start(model));
+		}
+		if self.grounded {
+			//walk maintenance
+			collector.collect(self.next_walk_instruction());
+		}else{
+			//check to see when the next strafe tick is
+			collector.collect(self.next_strafe_instruction());
+		}
+		collector.instruction()
+	}
+}
+
+impl crate::instruction::InstructionConsumer<PhysicsInstruction> for PhysicsState {
+	fn process_instruction(&mut self, ins:TimedInstruction<PhysicsInstruction>) {
+		//mutate position and velocity and time
+		self.body.advance_time(ins.time);//should this be in a separate function: self.advance_time?
+		match ins.instruction {
+		    PhysicsInstruction::CollisionStart(_) => todo!(),
+		    PhysicsInstruction::CollisionEnd(_) => todo!(),
+		    PhysicsInstruction::StrafeTick => {
+		    	let control_dir=self.get_control_dir();//this respects your mouse interpolation settings
+    			let d=self.body.velocity.dot(control_dir);
+    			if d<self.mv {
+    				self.body.velocity+=(self.mv-d)*control_dir;
+    			}
+    		}
+		    PhysicsInstruction::Jump => {
+				self.grounded=false;//do I need this?
+				self.body.velocity+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
+			}
+		    PhysicsInstruction::ReachWalkTargetVelocity => {
+		    	//precisely set velocity
+				self.body.velocity=self.walk_target_velocity;
+			}
+    		PhysicsInstruction::SetWalkTargetVelocity(v) => {
+    			self.walk_target_velocity=v;
+    			//calculate acceleration yada yada
+    		},
+		}
+	}
+}

src/instruction.rs

@@ -0,0 +1,37 @@
+pub struct TimedInstruction<I> {
+	pub time: crate::body::TIME,
+	pub instruction: I,
+}
+
+pub trait InstructionEmitter<I> {
+	fn next_instruction(&self) -> Option<TimedInstruction<I>>;
+}
+pub trait InstructionConsumer<I> {
+	fn process_instruction(&mut self, instruction:TimedInstruction<I>);
+}
+
+//PROPER PRIVATE FIELDS!!!
+pub struct InstructionCollector<I> {
+	instruction: Option<TimedInstruction<I>>,
+}
+impl<I> InstructionCollector<I> {
+	pub fn new() -> Self {
+		Self{instruction:None}
+	}
+
+	pub fn collect(&mut self,instruction:Option<TimedInstruction<I>>){
+		match &instruction {
+			Some(unwrap_instruction) => match &self.instruction {
+				Some(unwrap_best_instruction) => if unwrap_instruction.time<unwrap_best_instruction.time {
+					self.instruction=instruction;
+				},
+				None => self.instruction=instruction,
+			},
+			None => (),
+		}
+	}
+	pub fn instruction(self) -> Option<TimedInstruction<I>> {
+		//STEAL INSTRUCTION AND DESTROY INSTRUCTIONCOLLECTOR
+		return self.instruction
+	}
+}

src/lib.rs

@@ -1 +1,4 @@
 pub mod framework;
+pub mod body;
+pub mod instruction;
+pub mod timelines;

src/main.rs

@@ -24,7 +24,7 @@ struct ModelData {
 	entities: Vec<Entity>,
 }
 
-struct Model {
+struct ModelGraphics {
 	transform: glam::Mat4,
 	vertex_buf: wgpu::Buffer,
 	entities: Vec<Entity>,
@@ -34,20 +34,12 @@ struct Model {
 
 // Note: we use the Y=up coordinate space in this example.
 struct Camera {
-	time: Instant,
-	pos: glam::Vec3,
-	vel: glam::Vec3,
-	gravity: glam::Vec3,
-	friction: f32,
 	screen_size: (u32, u32),
 	offset: glam::Vec3,
 	fov: f32,
 	yaw: f32,
 	pitch: f32,
 	controls: u32,
-	mv: f32,
-	grounded: bool,
-	walkspeed: f32,
 }
 
 const CONTROL_MOVEFORWARD:u32 = 0b00000001;
@@ -100,7 +92,7 @@ fn get_control_dir(controls: u32) -> glam::Vec3{
 	}
 
 impl Camera {
-	fn to_uniform_data(&self) -> [f32; 16 * 3 + 4] {
+	fn to_uniform_data(&self, pos: glam::Vec3) -> [f32; 16 * 3 + 4] {
 		let aspect = self.screen_size.0 as f32 / self.screen_size.1 as f32;
 		let fov = if self.controls&CONTROL_ZOOM==0 {
 			self.fov
@@ -109,7 +101,7 @@ impl Camera {
 		};
 		let proj = perspective_rh(fov, aspect, 0.5, 1000.0);
 		let proj_inv = proj.inverse();
-		let view = glam::Mat4::from_translation(self.pos+self.offset) * glam::Mat4::from_euler(glam::EulerRot::YXZ, self.yaw, self.pitch, 0f32);
+		let view = glam::Mat4::from_translation(pos+self.offset) * glam::Mat4::from_euler(glam::EulerRot::YXZ, self.yaw, self.pitch, 0f32);
 		let view_inv = view.inverse();
 
 		let mut raw = [0f32; 16 * 3 + 4];
@@ -122,13 +114,15 @@ impl Camera {
 }
 
 pub struct Skybox {
+	start_time: std::time::Instant,
 	camera: Camera,
+	physics: strafe_client::body::PhysicsState,
 	sky_pipeline: wgpu::RenderPipeline,
 	entity_pipeline: wgpu::RenderPipeline,
 	ground_pipeline: wgpu::RenderPipeline,
 	main_bind_group: wgpu::BindGroup,
 	camera_buf: wgpu::Buffer,
-	models: Vec<Model>,
+	models: Vec<ModelGraphics>,
 	depth_view: wgpu::TextureView,
 	staging_belt: wgpu::util::StagingBelt,
 }
@@ -290,28 +284,69 @@ impl strafe_client::framework::Example for Skybox {
 		});
 
 		let camera = Camera {
-			time: Instant::now(),
-			pos: glam::Vec3::new(5.0,0.0,5.0),
-			vel: glam::Vec3::new(0.0,0.0,0.0),
-			gravity: glam::Vec3::new(0.0,-100.0,0.0),
-			friction: 90.0,
 			screen_size: (config.width, config.height),
 			offset: glam::Vec3::new(0.0,4.5,0.0),
 			fov: 1.0, //fov_slope = tan(fov_y/2)
 			pitch: 0.0,
 			yaw: 0.0,
-			mv: 2.7,
 			controls:0,
-			grounded: true,
-			walkspeed: 18.0,
 		};
-		let camera_uniforms = camera.to_uniform_data();
+		let physics = strafe_client::body::PhysicsState {
+			body: strafe_client::body::Body {
+				position: glam::Vec3::new(5.0,0.0,5.0),
+				velocity: glam::Vec3::new(0.0,0.0,0.0),
+				time: 0,
+			},
+			time: 0,
+			tick: 0,
+			strafe_tick_num: 100,//100t
+			strafe_tick_den: 1_000_000_000,
+			gravity: glam::Vec3::new(0.0,-100.0,0.0),
+			friction: 90.0,
+			mv: 2.7,
+			grounded: true,
+			jump_trying: false,
+			walkspeed: 18.0,
+			contacts: Vec::<strafe_client::body::RelativeCollision>::new(),
+    		models_cringe_clone: modeldatas.iter().map(|m|strafe_client::body::Model::new(m.transform)).collect(),
+		};
+
+		let camera_uniforms = camera.to_uniform_data(physics.extrapolate_position(0));
 		let camera_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
 			label: Some("Camera"),
 			contents: bytemuck::cast_slice(&camera_uniforms),
 			usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
 		});
 
+		//drain the modeldata vec so entities can be /moved/ to models.entities
+		let mut models = Vec::<ModelGraphics>::with_capacity(modeldatas.len());
+		for (i,modeldata) in modeldatas.drain(..).enumerate() {
+			let model_uniforms = get_transform_uniform_data(&modeldata.transform);
+			let model_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+				label: Some(format!("ModelGraphics{}",i).as_str()),
+				contents: bytemuck::cast_slice(&model_uniforms),
+				usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
+			});
+			let model_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+				layout: &model_bind_group_layout,
+				entries: &[
+					wgpu::BindGroupEntry {
+						binding: 0,
+						resource: model_buf.as_entire_binding(),
+					},
+				],
+				label: Some(format!("ModelGraphics{}",i).as_str()),
+			});
+			//all of these are being moved here
+			models.push(ModelGraphics{
+				transform: modeldata.transform,
+				vertex_buf:modeldata.vertex_buf,
+				entities: modeldata.entities,
+				bind_group: model_bind_group,
+				model_buf,
+			})
+		}
+
 		let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
 			label: None,
 			bind_group_layouts: &[&main_bind_group_layout, &model_bind_group_layout],
@@ -507,39 +542,12 @@ impl strafe_client::framework::Example for Skybox {
 			label: Some("Camera"),
 		});
 
-		//drain the modeldata vec so entities can be /moved/ to models.entities
-		let mut models = Vec::<Model>::with_capacity(modeldatas.len());
-		for (i,modeldata) in modeldatas.drain(..).enumerate() {
-			let model_uniforms = get_transform_uniform_data(&modeldata.transform);
-			let model_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
-				label: Some(format!("Model{}",i).as_str()),
-				contents: bytemuck::cast_slice(&model_uniforms),
-				usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
-			});
-			let model_bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
-				layout: &model_bind_group_layout,
-				entries: &[
-					wgpu::BindGroupEntry {
-						binding: 0,
-						resource: model_buf.as_entire_binding(),
-					},
-				],
-				label: Some(format!("Model{}",i).as_str()),
-			});
-			//all of these are being moved here
-			models.push(Model{
-				transform: modeldata.transform,
-				vertex_buf:modeldata.vertex_buf,
-				entities: modeldata.entities,
-				bind_group: model_bind_group,
-				model_buf,
-			})
-		}
-
 		let depth_view = Self::create_depth_texture(config, device);
 
 		Skybox {
+			start_time: Instant::now(),
 			camera,
+			physics,
 			sky_pipeline,
 			entity_pipeline,
 			ground_pipeline,
@@ -625,44 +633,18 @@ impl strafe_client::framework::Example for Skybox {
 		queue: &wgpu::Queue,
 		_spawner: &strafe_client::framework::Spawner,
 	) {
-		let time = Instant::now();
-
-		//physique
-		let dt=(time-self.camera.time).as_secs_f32();
-		self.camera.time=time;
 		let camera_mat=glam::Mat3::from_euler(glam::EulerRot::YXZ,self.camera.yaw,0f32,0f32);
 		let control_dir=camera_mat*get_control_dir(self.camera.controls&(CONTROL_MOVELEFT|CONTROL_MOVERIGHT|CONTROL_MOVEFORWARD|CONTROL_MOVEBACK)).normalize_or_zero();
-		let d=self.camera.vel.dot(control_dir);
+
-		if d<self.camera.mv {
+		let time=self.start_time.elapsed().as_nanos() as i64;
-			self.camera.vel+=(self.camera.mv-d)*control_dir;
+
-		}
+		self.physics.run(time,control_dir,self.camera.controls);
-		self.camera.vel+=self.camera.gravity*dt;
-		self.camera.pos+=self.camera.vel*dt;
-		if self.camera.pos.y<0.0{
-			self.camera.pos.y=0.0;
-			self.camera.vel.y=0.0;
-			self.camera.grounded=true;
-		}
-		if self.camera.grounded&&(self.camera.controls&CONTROL_JUMP)!=0 {
-			self.camera.grounded=false;
-			self.camera.vel+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
-		}
-		if self.camera.grounded {
-			let applied_friction=self.camera.friction*dt;
-			let targetv=control_dir*self.camera.walkspeed;
-			let diffv=targetv-self.camera.vel;
-			if applied_friction*applied_friction<diffv.length_squared() {
-				self.camera.vel+=applied_friction*diffv.normalize();
-			} else {
-				self.camera.vel=targetv;
-			}
-		}
 
 		let mut encoder =
 			device.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
 
 		// update rotation
-		let camera_uniforms = self.camera.to_uniform_data();
+		let camera_uniforms = self.camera.to_uniform_data(self.physics.extrapolate_position(time));
 		self.staging_belt
 			.write_buffer(
 				&mut encoder,

src/sweep.rs

@@ -0,0 +1,8 @@
+
+//something that implements body + hitbox + transform can predict collision
+impl crate::sweep::PredictCollision for Model {
+	fn predict_collision(&self,other:&Model) -> Option<crate::event::EventStruct> {
+		//math!
+		None
+	}
+}

src/timelines.rs

@@ -0,0 +1,47 @@
+type ORDER = u32;
+
+pub struct Tracker {
+	order: ORDER,
+}
+
+pub struct TimelineInstruction<I>{
+	pub order: ORDER,//absolute ordering of instructions which can be used for sorting even when there are multiple simultaneous timestamps
+	pub instruction: crate::instruction::TimedInstruction<I>,
+}
+
+pub struct Timeline<I>{
+	instructions: std::collections::VecDeque<TimelineInstruction<I>>,
+	trackers: Vec<Tracker>,//wrong
+}
+
+impl<I> Timeline<I>{
+	pub fn new() -> Self {
+		Self{
+			instructions:std::collections::VecDeque::<TimelineInstruction<I>>::new(),
+			trackers:Vec::<Tracker>::new(),
+		}
+	}
+
+	pub fn len(&self) -> usize {
+		return self.instructions.len()
+	}
+	pub fn first(&self) -> Option<&TimelineInstruction<I>> {
+		return self.instructions.get(0)
+	}
+	pub fn last(&self) -> Option<&TimelineInstruction<I>> {
+		return self.instructions.get(self.instructions.len()-1)
+	}
+	pub fn append(&mut self,instruction:TimelineInstruction<I>){
+		let i=self.instructions.len();
+		self.instructions.push_back(instruction);
+		for tracker in self.trackers.iter() {
+			tracker.set_active(true);
+		}
+	}
+	pub fn get_index_after_time(&mut self,time:crate::body::TIME) -> usize{
+		self.instructions.partition_point(|ins|ins.instruction.time<time)
+	}
+	pub fn get_index_after_order(&mut self,order:ORDER) -> usize{
+		self.instructions.partition_point(|ins|ins.order<order)
+	}
+}