wip: tickless physics

src/body.rs

@@ -5,6 +5,14 @@ pub enum PhysicsInstruction {
 	CollisionEnd(RelativeCollision),
 	StrafeTick,
 	Jump,
+	SetWalkTargetVelocity(glam::Vec3),
+	ReachWalkTargetVelocity,
+	// Water,
+	// Spawn(
+	// 	Option<SpawnId>,
+	// 	bool,//true = Trigger; false = teleport
+	// 	bool,//true = Force
+	// )
 }
 
 pub struct Body {
@@ -13,6 +21,13 @@ pub struct Body {
 	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>,
@@ -170,41 +185,19 @@ 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, control_dir: glam::Vec3, controls: u32){
-		let target_tick = (time*self.strafe_tick_num/self.strafe_tick_den) as u32;
-		//the game code can run for 1 month before running out of ticks
-		while self.tick<target_tick {
-			self.tick += 1;
-			let dt=0.01;
-			let d=self.body.velocity.dot(control_dir);
-			if d<self.mv {
-				self.body.velocity+=(self.mv-d)*control_dir;
-			}
-			self.body.velocity+=self.gravity*dt;
-			self.body.position+=self.body.velocity*dt;
-			if self.body.position.y<0.0{
-				self.body.position.y=0.0;
-				self.body.velocity.y=0.0;
-				self.grounded=true;
-			}
-			if self.grounded&&(controls&CONTROL_JUMP)!=0 {
-				self.grounded=false;
-				self.body.velocity+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
-			}
-			if self.grounded {
-				let applied_friction=self.friction*dt;
-				let targetv=control_dir*self.walkspeed;
-				let diffv=targetv-self.body.velocity;
-				if applied_friction*applied_friction<diffv.length_squared() {
-					self.body.velocity+=applied_friction*diffv.normalize();
-				} else {
-					//PhysicsInstruction::WalkTargetReached
-					self.body.velocity=targetv;
-				}
+	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
 		}
 
-		self.body.time=target_tick as TIME*self.strafe_tick_den/self.strafe_tick_num;
 	}
 
 	//delete this
@@ -216,15 +209,48 @@ impl PhysicsState {
 	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>> {
@@ -236,36 +262,60 @@ 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 best = crate::instruction::InstructionCollector::new();
+		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
-			best.collect(Some(TimedInstruction{
+			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() {
-			best.collect(self.predict_collision_end(self.models_cringe_clone.get(collision_data.model as usize).unwrap()));
+			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 {
-			best.collect(self.predict_collision_start(model));
+			collector.collect(self.predict_collision_start(model));
 		}
 		if self.grounded {
 			//walk maintenance
-			best.collect(self.next_walk_instruction());
+			collector.collect(self.next_walk_instruction());
 		}else{
 			//check to see when the next strafe tick is
-			best.collect(self.next_strafe_instruction());
+			collector.collect(self.next_strafe_instruction());
 		}
-		best.instruction()
+		collector.instruction()
 	}
 }
 
 impl crate::instruction::InstructionConsumer<PhysicsInstruction> for PhysicsState {
-	fn process_instruction(&mut self, instruction:TimedInstruction<PhysicsInstruction>) {
-		//
+	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/lib.rs

@@ -1,3 +1,3 @@
 pub mod framework;
 pub mod body;
-pub mod event;
+pub mod instruction;