do not step physics on mouse input, only update pos (overwriting previous pos)

src/body.rs

@@ -102,7 +102,7 @@ pub struct MouseInterpolationState {
 impl MouseInterpolationState {
 	pub fn new() -> Self {
 		Self {
-			interpolation:MouseInterpolation::Lerp,
+			interpolation:MouseInterpolation::First,
 			time0:0,
 			time1:1,//ONE NANOSECOND!!!! avoid divide by zero
 			mouse0:glam::IVec2::ZERO,
@@ -122,9 +122,9 @@ impl MouseInterpolationState {
 				let m0=self.mouse0.as_i64vec2();
 				let m1=self.mouse1.as_i64vec2();
 				//these are deltas
+				let t1t=(self.time1-time) as i64;
+				let tt0=(time-self.time0) as i64;
 				let dt=(self.time1-self.time0) as i64;
-				let t1t=(self.time1-time).clamp(0,dt) as i64;
-				let tt0=(time-self.time0).clamp(0,dt) as i64;
 				((m0*t1t+m1*tt0)/dt).as_ivec2()
 			}
 		}
@@ -902,6 +902,7 @@ impl crate::instruction::InstructionConsumer<PhysicsInstruction> for PhysicsStat
 		}
 		//selectively update body
 		match &ins.instruction {
+		    PhysicsInstruction::Input(InputInstruction::MoveMouse(_)) => (),//dodge time for mouse movement
     		PhysicsInstruction::Input(_)
 		    |PhysicsInstruction::ReachWalkTargetVelocity
 		    |PhysicsInstruction::CollisionStart(_)

src/main.rs

@@ -34,8 +34,6 @@ struct ModelGraphics {
 }
 
 pub struct Skybox {
-	block_mouse:strafe_client::body::TIME,
-	period:strafe_client::body::TIME,
 	start_time: std::time::Instant,
 	screen_size: (u32, u32),
 	physics: strafe_client::body::PhysicsState,
@@ -475,8 +473,6 @@ impl strafe_client::framework::Example for Skybox {
 		let depth_view = Self::create_depth_texture(config, device);
 
 		Skybox {
-			block_mouse:0,
-			period:5_000_000,
 			start_time: Instant::now(),
 			screen_size: (config.width,config.height),
 			physics,
@@ -522,7 +518,7 @@ impl strafe_client::framework::Example for Skybox {
 					_ => None,
 				}
 				{
-					self.physics.run(time);//call it a day
+					self.physics.run(time);
 					self.physics.process_instruction(TimedInstruction{
 						time,
 						instruction:PhysicsInstruction::Input(input_instruction),
@@ -532,34 +528,20 @@ impl strafe_client::framework::Example for Skybox {
 			winit::event::DeviceEvent::MouseMotion {
 			    delta,//these (f64,f64) are integers on my machine
 			} => {
-				let run_the_physics=
-				if time<self.block_mouse{
-					false
-				}else{
-					if time-self.block_mouse<2*self.period{
-						self.block_mouse+=self.period
-					}else{
-						self.block_mouse=time+self.period
-					}
-					true
-				};
-				if run_the_physics{
-					//This lags like crazy if you require a substep for every mouse event (every 3ms)
-					//I'm going to forgo mouse interpolation for now
-					//because it's actually a hard problem to prevent the physics from running on every mouse update
-					self.physics.run(time);//call it a day
-					self.physics.process_instruction(TimedInstruction{
-						time,
-						instruction:PhysicsInstruction::Input(InputInstruction::MoveMouse(glam::ivec2(delta.0 as i32,delta.1 as i32))),
-					})
-				}
+				//do not step the physics because the mouse polling rate is higher than the physics can run.
+				//essentially the previous input will be overwritten until a true step runs
+				//which is fine because they run all the time.
+				self.physics.process_instruction(TimedInstruction{
+					time,
+					instruction:PhysicsInstruction::Input(InputInstruction::MoveMouse(glam::ivec2(delta.0 as i32,delta.1 as i32))),
+				})
 			},
 			winit::event::DeviceEvent::MouseWheel {
 			    delta,
 			} => {
 				println!("mousewheel{:?}",delta);
 				if true{//self.physics.use_scroll
-					self.physics.run(time);//call it a day
+					self.physics.run(time);
 					self.physics.process_instruction(TimedInstruction{
 						time,
 						instruction:PhysicsInstruction::Input(InputInstruction::Jump(true)),//activates the immediate jump path, but the style modifier prevents controls&CONTROL_JUMP bit from being set to auto jump