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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 positions: Vec<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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positions: Vec::with_capacity(capacity),
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}
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}
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pub fn push(&mut self, gear_id: GearId, position: &FPPoint) {
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self.gear_ids.push(gear_id);
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self.positions.push(*position);
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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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*pos += *vel * time_step;
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if !vel.is_zero() {
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self.position_updates.push(gear_id, 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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}
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