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use replace_with to replace the enum variant in-place without cloning

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Quaternions 2025-01-13 23:11:43 -08:00
parent 844c7a08e1
commit c6ff11dd3e
1 changed files with 40 additions and 35 deletions
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75
strafe-client/src/mouse_interpolator.rs
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@ -28,15 +28,16 @@ enum BufferState{
Buffered(SessionTime,MouseState<PhysicsTimeInner>),
}
impl BufferState{
fn next_state(&self,ins:DoubleTimedUnbufferedInstruction,physics_timeline:&mut std::collections::VecDeque<TimedPhysicsInstruction>)->(Self,Option<TimedInstruction<OtherInstruction,PhysicsTimeInner>>){
match self{
fn next_state(self,ins:DoubleTimedUnbufferedInstruction,physics_timeline:&mut std::collections::VecDeque<TimedPhysicsInstruction>)->(Option<TimedInstruction<OtherInstruction,PhysicsTimeInner>>,Self){
let next_state=match self{
BufferState::Unbuffered=>{
if let PhysicsUnbufferedInstruction::MoveMouse(pos)=ins.instruction.instruction{
return (BufferState::Initializing(ins.time,MouseState{pos,time:ins.instruction.time}),None);
return (None,BufferState::Initializing(ins.time,MouseState{pos,time:ins.instruction.time}));
}
BufferState::Unbuffered
},
BufferState::Initializing(time,mouse_state)=>{
let timeout=*time+MOUSE_TIMEOUT;
let timeout=time+MOUSE_TIMEOUT;
if timeout<ins.time{
// duplicate the current mouse
physics_timeline.push_front(TimedInstruction{
@ -48,7 +49,7 @@ impl BufferState{
MouseInstruction::SetNextMouse(MouseState{pos:mouse_state.pos,time:ins.instruction.time})
),
});
return (BufferState::Unbuffered,None);
return (None,BufferState::Unbuffered);
}
if let PhysicsUnbufferedInstruction::MoveMouse(pos)=ins.instruction.instruction{
let next_mouse_state=MouseState{pos,time:ins.instruction.time};
@ -56,17 +57,18 @@ impl BufferState{
time:mouse_state.time,
instruction:PhysicsInputInstruction::Mouse(
MouseInstruction::ReplaceMouse{
s0:mouse_state.clone(),
s0:mouse_state,
s1:next_mouse_state.clone(),
}
),
});
return (BufferState::Buffered(ins.time,next_mouse_state),None);
return (None,BufferState::Buffered(ins.time,next_mouse_state));
}
BufferState::Initializing(time,mouse_state)
},
BufferState::Buffered(time,mouse_state)=>{
// TODO: deduplicate code with above case
let timeout=*time+MOUSE_TIMEOUT;
let timeout=time+MOUSE_TIMEOUT;
if timeout<ins.time{
// duplicate the current mouse
physics_timeline.push_front(TimedInstruction{
@ -78,7 +80,7 @@ impl BufferState{
MouseInstruction::SetNextMouse(MouseState{pos:mouse_state.pos,time:ins.instruction.time})
),
});
return (BufferState::Unbuffered,None);
return (None,BufferState::Unbuffered);
}
if let PhysicsUnbufferedInstruction::MoveMouse(pos)=ins.instruction.instruction{
let next_mouse_state=MouseState{pos,time:ins.instruction.time};
@ -88,10 +90,11 @@ impl BufferState{
MouseInstruction::SetNextMouse(next_mouse_state.clone())
),
});
return (BufferState::Buffered(ins.time,next_mouse_state),None);
return (None,BufferState::Buffered(ins.time,next_mouse_state));
}
BufferState::Buffered(time,mouse_state)
},
}
};
let instruction_out=match ins.instruction.instruction{
PhysicsUnbufferedInstruction::MoveMouse(_)=>None,
PhysicsUnbufferedInstruction::Other(other_instruction)=>Some(TimedInstruction{
@ -99,7 +102,7 @@ impl BufferState{
instruction:other_instruction,
}),
};
(self.clone(),instruction_out)
(instruction_out,next_state)
}
}
pub struct MouseInterpolator{
@ -139,9 +142,10 @@ impl MouseInterpolator{
// a mouse event is buffered, and exists within the last 10ms
// case 3: stop
// a mouse event is buffered, but no mouse events have transpired within 10ms
// TODO: remove clone
let ins_inner;
(self.buffer_state,ins_inner)=self.buffer_state.next_state(ins,&mut self.physics_timeline);
// replace_with allows the enum variant to safely be replaced from behind a mutable reference
let ins_inner=replace_with::replace_with_or_abort_and_return(&mut self.buffer_state,|buffer_state|{
buffer_state.next_state(ins,&mut self.physics_timeline)
});
if let Some(ins)=ins_inner{
self.physics_timeline.push_back(TimedInstruction{
time:ins.time,
@ -196,26 +200,27 @@ impl MouseInterpolator{
match ins{
// could check if self.is_first_ready()
StepInstruction::Pop=>self.physics_timeline.pop_front(),
StepInstruction::Timeout=>match &self.buffer_state{
BufferState::Unbuffered=>None,
BufferState::Initializing(time,mouse_state)
|BufferState::Buffered(time,mouse_state)=>{
// convert to BufferState::Unbuffered
// use the first instruction which should be a mouse instruction
// to push a ReplaceMouse instruction
// duplicate the current mouse
self.buffer_state=BufferState::Unbuffered;
Some(TimedInstruction{
// This should be simulation_timer.time(timeout)
// but the timer is not accessible from this scope
// and it's just here to say that the mouse isn't moving anyways.
time:mouse_state.time,
instruction:PhysicsInputInstruction::Mouse(
MouseInstruction::SetNextMouse(MouseState{pos:mouse_state.pos,time:mouse_state.time})
),
})
},
},
StepInstruction::Timeout=>replace_with::replace_with_or_abort_and_return(&mut self.buffer_state,|buffer_state|{
match buffer_state{
BufferState::Unbuffered=>(None,BufferState::Unbuffered),
BufferState::Initializing(_time,mouse_state)
|BufferState::Buffered(_time,mouse_state)=>{
// convert to BufferState::Unbuffered
// use the first instruction which should be a mouse instruction
// to push a ReplaceMouse instruction
// duplicate the current mouse
(Some(TimedInstruction{
// This should be simulation_timer.time(timeout)
// but the timer is not accessible from this scope
// and it's just here to say that the mouse isn't moving anyways.
time:mouse_state.time,
instruction:PhysicsInputInstruction::Mouse(
MouseInstruction::SetNextMouse(MouseState{pos:mouse_state.pos,time:mouse_state.time})
),
}),BufferState::Unbuffered)
},
}
}),
}
}
}