rust/hwphysics/src/physics.rs
author alfadur
Wed, 24 Jul 2019 23:33:06 +0300
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permissions -rw-r--r--
update collision grid with position changes
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use crate::common::{GearData, GearDataProcessor, GearId};
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use fpnum::*;
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use integral_geometry::{GridIndex, Point, Size};
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#[derive(PartialEq, Eq, Clone, Copy, Debug)]
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pub struct PhysicsData {
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    pub position: FPPoint,
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    pub velocity: FPPoint,
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}
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impl GearData for PhysicsData {}
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impl PhysicsData {
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    pub fn new(position: FPPoint, velocity: FPPoint) -> Self {
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        Self { position, velocity }
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    }
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}
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pub struct DynamicPhysicsCollection {
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    gear_ids: Vec<GearId>,
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    positions: Vec<FPPoint>,
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    velocities: Vec<FPPoint>,
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}
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impl DynamicPhysicsCollection {
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    fn new() -> Self {
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        Self {
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            gear_ids: Vec::new(),
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            positions: Vec::new(),
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            velocities: Vec::new(),
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        }
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    }
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    fn len(&self) -> usize {
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        self.gear_ids.len()
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    }
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    fn push(&mut self, id: GearId, physics: PhysicsData) {
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        self.gear_ids.push(id);
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        self.positions.push(physics.position);
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        self.velocities.push(physics.velocity);
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    }
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    fn iter_pos_update(&mut self) -> impl Iterator<Item = (GearId, (&mut FPPoint, &FPPoint))> {
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        self.gear_ids
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            .iter()
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            .cloned()
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            .zip(self.positions.iter_mut().zip(self.velocities.iter()))
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    }
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}
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pub struct StaticPhysicsCollection {
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    gear_ids: Vec<GearId>,
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    positions: Vec<FPPoint>,
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}
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impl StaticPhysicsCollection {
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    fn new() -> Self {
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        Self {
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            gear_ids: Vec::new(),
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            positions: Vec::new(),
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        }
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    }
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    fn push(&mut self, gear_id: GearId, physics: PhysicsData) {
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        self.gear_ids.push(gear_id);
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        self.positions.push(physics.position);
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    }
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}
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pub struct PhysicsProcessor {
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    dynamic_physics: DynamicPhysicsCollection,
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    static_physics: StaticPhysicsCollection,
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    physics_cleanup: Vec<GearId>,
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    position_updates: PositionUpdates,
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}
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pub struct PositionUpdates {
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    pub gear_ids: Vec<GearId>,
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    pub shifts: Vec<(FPPoint, FPPoint)>,
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}
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impl PositionUpdates {
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    pub fn new(capacity: usize) -> Self {
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        Self {
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            gear_ids: Vec::with_capacity(capacity),
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            shifts: Vec::with_capacity(capacity),
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        }
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    }
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    pub fn push(&mut self, gear_id: GearId, old_position: &FPPoint, new_position: &FPPoint) {
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        self.gear_ids.push(gear_id);
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        self.shifts.push((*old_position, *new_position));
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    }
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    pub fn iter(&self) -> impl Iterator<Item = (GearId, &FPPoint, &FPPoint)> {
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        self.gear_ids
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            .iter()
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            .cloned()
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            .zip(self.shifts.iter())
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            .map(|(id, (from, to))| (id, from, to))
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    }
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}
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impl PhysicsProcessor {
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    pub fn new() -> Self {
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        PhysicsProcessor {
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            dynamic_physics: DynamicPhysicsCollection::new(),
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            static_physics: StaticPhysicsCollection::new(),
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            physics_cleanup: Vec::new(),
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            position_updates: PositionUpdates::new(0),
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        }
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    }
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    pub fn process(&mut self, time_step: FPNum) -> &PositionUpdates {
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        for (gear_id, (pos, vel)) in self.dynamic_physics.iter_pos_update() {
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            let old_pos = *pos;
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            *pos += *vel * time_step;
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            if !vel.is_zero() {
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                self.position_updates.push(gear_id, &old_pos, pos)
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            } else {
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                self.physics_cleanup.push(gear_id)
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            }
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        }
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        &self.position_updates
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    }
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    pub fn push(&mut self, gear_id: GearId, physics_data: PhysicsData) {
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        if physics_data.velocity.is_zero() {
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            self.static_physics.push(gear_id, physics_data);
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        } else {
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            self.dynamic_physics.push(gear_id, physics_data);
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        }
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    }
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}
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impl GearDataProcessor<PhysicsData> for PhysicsProcessor {
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    fn add(&mut self, gear_id: GearId, gear_data: PhysicsData) {
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        if gear_data.velocity.is_zero() {
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            self.static_physics.push(gear_id, gear_data);
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        } else {
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            self.dynamic_physics.push(gear_id, gear_data);
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        }
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    }
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}