wip: tickless physics
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8daf432991
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0fe14749d3
118
src/body.rs
118
src/body.rs
@ -5,6 +5,8 @@ pub enum PhysicsInstruction {
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CollisionEnd(RelativeCollision),
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StrafeTick,
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Jump,
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SetWalkTargetVelocity(glam::Vec3),
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ReachWalkTargetVelocity,
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// Water,
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// Spawn(
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// Option<SpawnId>,
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@ -14,15 +16,25 @@ pub enum PhysicsInstruction {
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}
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pub struct Body {
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pub position: glam::Vec3,//I64 where 2^32 = 1 u
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pub velocity: glam::Vec3,//I64 where 2^32 = 1 u/s
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pub time: TIME,//nanoseconds x xxxxD!
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position: glam::Vec3,//I64 where 2^32 = 1 u
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velocity: glam::Vec3,//I64 where 2^32 = 1 u/s
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acceleration: glam::Vec3,//I64 where 2^32 = 1 u/s/s
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time: TIME,//nanoseconds x xxxxD!
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}
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pub enum MoveRestriction {
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Air,
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Water,
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Ground,
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Ladder,//multiple ladders how
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}
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pub struct PhysicsState {
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pub body: Body,
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pub contacts: Vec<RelativeCollision>,
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//temp
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pub models_cringe_clone: Vec<Model>,
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pub temp_control_dir: glam::Vec3,
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pub time: TIME,
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pub strafe_tick_num: TIME,
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pub strafe_tick_den: TIME,
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@ -30,6 +42,7 @@ pub struct PhysicsState {
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pub mv: f32,
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pub walkspeed: f32,
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pub friction: f32,
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pub walk_target_velocity: glam::Vec3,
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pub gravity: glam::Vec3,
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pub grounded: bool,
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pub jump_trying: bool,
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@ -173,50 +186,45 @@ impl RelativeCollision {
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pub type TIME = i64;
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impl Body {
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pub fn with_position(position:glam::Vec3) -> Self {
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Self{
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position: position,
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velocity: glam::Vec3::ZERO,
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acceleration: glam::Vec3::ZERO,
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time: 0,
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}
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}
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pub fn extrapolated_position(&self,time: TIME)->glam::Vec3{
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let dt=(time-self.time) as f64/1_000_000_000f64;
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self.position+self.velocity*(dt as f32)+self.acceleration*((0.5*dt*dt) as f32)
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}
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pub fn advance_time(&mut self, time: TIME){
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self.position=self.extrapolated_position(time);
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self.time=time;
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}
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}
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const CONTROL_JUMP:u32 = 0b01000000;//temp DATA NORMALIZATION!@#$
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impl PhysicsState {
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//delete this, we are tickless gamers
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pub fn run(&mut self, time: TIME, control_dir: glam::Vec3, controls: u32){
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let target_tick = (time*self.strafe_tick_num/self.strafe_tick_den) as u32;
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//the game code can run for 1 month before running out of ticks
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while self.tick<target_tick {
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self.tick += 1;
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let dt=0.01;
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let d=self.body.velocity.dot(control_dir);
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if d<self.mv {
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self.body.velocity+=(self.mv-d)*control_dir;
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}
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self.body.velocity+=self.gravity*dt;
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self.body.position+=self.body.velocity*dt;
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if self.body.position.y<0.0{
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self.body.position.y=0.0;
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self.body.velocity.y=0.0;
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self.grounded=true;
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}
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if self.grounded&&(controls&CONTROL_JUMP)!=0 {
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self.grounded=false;
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self.body.velocity+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
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}
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if self.grounded {
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let applied_friction=self.friction*dt;
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let targetv=control_dir*self.walkspeed;
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let diffv=targetv-self.body.velocity;
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if applied_friction*applied_friction<diffv.length_squared() {
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self.body.velocity+=applied_friction*diffv.normalize();
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} else {
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//PhysicsInstruction::WalkTargetReached
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self.body.velocity=targetv;
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}
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//tickless gaming
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pub fn run(&mut self, time: TIME){
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//prepare is ommitted - everything is done via instructions.
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while let Some(instruction) = self.next_instruction() {//collect
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if time<instruction.time {
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break;
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}
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//advance
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//self.advance_time(instruction.time);
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//process
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self.process_instruction(instruction);
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//write hash lol
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}
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self.body.time=target_tick as TIME*self.strafe_tick_den/self.strafe_tick_num;
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}
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//delete this
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pub fn extrapolate_position(&self, time: TIME) -> glam::Vec3 {
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let dt=(time-self.body.time) as f64/1_000_000_000f64;
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self.body.position+self.body.velocity*(dt as f32)+self.gravity*((0.5*dt*dt) as f32)
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pub fn advance_time(&mut self, time: TIME){
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self.body.advance_time(time);
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self.time=time;
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}
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fn next_strafe_instruction(&self) -> Option<TimedInstruction<PhysicsInstruction>> {
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@ -304,7 +312,31 @@ impl crate::instruction::InstructionEmitter<PhysicsInstruction> for PhysicsState
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}
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impl crate::instruction::InstructionConsumer<PhysicsInstruction> for PhysicsState {
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fn process_instruction(&mut self, instruction:TimedInstruction<PhysicsInstruction>) {
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//
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fn process_instruction(&mut self, ins:TimedInstruction<PhysicsInstruction>) {
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//mutate position and velocity and time
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self.advance_time(ins.time);//should this be in run?
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match ins.instruction {
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PhysicsInstruction::CollisionStart(_) => todo!(),
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PhysicsInstruction::CollisionEnd(_) => todo!(),
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PhysicsInstruction::StrafeTick => {
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//let control_dir=self.get_control_dir();//this should respect your mouse interpolation settings
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let d=self.body.velocity.dot(self.temp_control_dir);
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if d<self.mv {
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self.body.velocity+=(self.mv-d)*self.temp_control_dir;
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}
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}
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PhysicsInstruction::Jump => {
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self.grounded=false;//do I need this?
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self.body.velocity+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
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}
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PhysicsInstruction::ReachWalkTargetVelocity => {
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//precisely set velocity
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self.body.velocity=self.walk_target_velocity;
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}
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PhysicsInstruction::SetWalkTargetVelocity(v) => {
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self.walk_target_velocity=v;
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//calculate acceleration yada yada
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},
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}
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}
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}
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16
src/main.rs
16
src/main.rs
@ -292,11 +292,7 @@ impl strafe_client::framework::Example for Skybox {
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controls:0,
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};
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let physics = strafe_client::body::PhysicsState {
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body: strafe_client::body::Body {
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position: glam::Vec3::new(5.0,0.0,5.0),
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velocity: glam::Vec3::new(0.0,0.0,0.0),
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time: 0,
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},
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body: strafe_client::body::Body::with_position(glam::Vec3::new(5.0,5.0,5.0)),
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time: 0,
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tick: 0,
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strafe_tick_num: 100,//100t
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@ -306,12 +302,14 @@ impl strafe_client::framework::Example for Skybox {
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mv: 2.7,
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grounded: true,
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jump_trying: false,
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temp_control_dir: glam::Vec3::ZERO,
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walkspeed: 18.0,
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contacts: Vec::<strafe_client::body::RelativeCollision>::new(),
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models_cringe_clone: modeldatas.iter().map(|m|strafe_client::body::Model::new(m.transform)).collect(),
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walk_target_velocity: glam::Vec3::ZERO,
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};
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let camera_uniforms = camera.to_uniform_data(physics.extrapolate_position(0));
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let camera_uniforms = camera.to_uniform_data(physics.body.extrapolated_position(0));
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let camera_buf = device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some("Camera"),
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contents: bytemuck::cast_slice(&camera_uniforms),
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@ -638,13 +636,15 @@ impl strafe_client::framework::Example for Skybox {
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let time=self.start_time.elapsed().as_nanos() as i64;
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self.physics.run(time,control_dir,self.camera.controls);
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self.physics.temp_control_dir=control_dir;
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self.physics.jump_trying=self.camera.controls&CONTROL_JUMP!=0;
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self.physics.run(time);
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let mut encoder =
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device.create_command_encoder(&wgpu::CommandEncoderDescriptor { label: None });
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// update rotation
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let camera_uniforms = self.camera.to_uniform_data(self.physics.extrapolate_position(time));
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let camera_uniforms = self.camera.to_uniform_data(self.physics.body.extrapolated_position(time));
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self.staging_belt
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.write_buffer(
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&mut encoder,
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