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|
use glam::Vec2;
use rapier2d::{
control::{CharacterAutostep, CharacterLength, KinematicCharacterController},
pipeline::QueryFilter,
};
use crate::{
config::GRAVITY,
input::Input,
sim::{
entity::{EntityBehaviour, EntityDef, EntityUpdateCtx},
rb_manager::character_impulses::solve_character_collision_impulses,
sim_manager::SimCtx,
},
};
#[derive(PartialEq, Eq)]
enum FacingDirection {
Left,
Right,
}
struct WizardEntityBehaviour {
movement_input_x: f32,
jump: f32,
grounded: bool,
acc_vel: Vec2,
kinematic_controller: KinematicCharacterController,
facing_direction: FacingDirection,
facing_strength: f32,
}
const JUMP_VELOCITY: f32 = 100.0;
const ACCEL: f32 = 1000.0;
const AIR_ACCEL: f32 = 350.0;
const MAX_SPEED: f32 = 75.0;
impl WizardEntityBehaviour {
fn set_facing_dir(&mut self, update_ctx: &mut EntityUpdateCtx, dir: FacingDirection) {
if self.facing_direction != dir {
update_ctx.entity_data.cells.as_mut().unwrap().flip_x();
self.facing_direction = dir;
}
}
}
impl EntityBehaviour for WizardEntityBehaviour {
fn update(&mut self, _: &mut EntityUpdateCtx, ctx: &mut SimCtx, _: f32) {
if ctx.input_manager.held(Input::Left) {
self.movement_input_x = -1.0;
} else if ctx.input_manager.held(Input::Right) {
self.movement_input_x = 1.0;
} else {
self.movement_input_x = 0.0;
}
if ctx.input_manager.pressed(Input::Jump) {
self.jump = 0.06;
}
}
fn physics_update(
&mut self,
update_ctx: &mut EntityUpdateCtx,
ctx: &mut SimCtx,
delta_time: f32,
) {
if self.grounded {
// TODO delta_time
if self.movement_input_x.abs() < 0.2 {
self.acc_vel.x = self.acc_vel.x * 0.7;
}
// if we're moving up, keep moving up
self.acc_vel.y = self.acc_vel.y.min(0.0);
if self.jump > 0.0 {
self.acc_vel.y -= JUMP_VELOCITY;
self.jump = 0.0;
}
} else {
self.acc_vel.x = self.acc_vel.x * 0.95;
self.acc_vel.y += GRAVITY * delta_time;
if self.jump > 0.0 {
self.jump -= delta_time;
}
}
if self.acc_vel.x.abs() < 1.0 {
self.acc_vel.x = 0.0;
}
let flip_adj = if self.acc_vel.x.signum() != self.movement_input_x.signum() {
3.0
} else {
1.0
};
self.acc_vel.x += self.movement_input_x
* if self.grounded { ACCEL } else { AIR_ACCEL }
* delta_time
* flip_adj;
self.acc_vel.x = self.acc_vel.x.clamp(-MAX_SPEED, MAX_SPEED);
let query_pipeline = ctx
.rb_manager
.physics_manager
.world
.broad_phase
.as_query_pipeline(
ctx.rb_manager
.physics_manager
.world
.narrow_phase
.query_dispatcher(),
&ctx.rb_manager.physics_manager.world.bodies,
&ctx.rb_manager.physics_manager.world.colliders,
QueryFilter::default().exclude_rigid_body(update_ctx.entity_data.rb_h.unwrap()),
);
let rb = ctx
.rb_manager
.physics_manager
.world
.bodies
.get(update_ctx.entity_data.rb_h.unwrap())
.unwrap();
let collider = ctx
.rb_manager
.physics_manager
.world
.colliders
.get(update_ctx.entity_data.collider_h.unwrap())
.unwrap()
.clone();
// move_shape works in translations, not velocities: feed it the distance we
// want to cover this step, and convert the allowed distance back to a velocity.
let mut collisions = Vec::new();
let movement = self.kinematic_controller.move_shape(
delta_time,
&query_pipeline,
collider.shape(),
rb.position(),
self.acc_vel * delta_time,
|col| collisions.push(col),
);
let mut query_pipeline_mut = ctx
.rb_manager
.physics_manager
.world
.broad_phase
.as_query_pipeline_mut(
ctx.rb_manager
.physics_manager
.world
.narrow_phase
.query_dispatcher(),
&mut ctx.rb_manager.physics_manager.world.bodies,
&mut ctx.rb_manager.physics_manager.world.colliders,
QueryFilter::default().exclude_rigid_body(update_ctx.entity_data.rb_h.unwrap()),
);
// apply collisions to other scene entities. Local port: rapier's own
// solve_character_collision_impulses panics with 2+ nearby dynamic bodies.
solve_character_collision_impulses(
&self.kinematic_controller,
delta_time,
&mut query_pipeline_mut,
collider.shape(),
update_ctx.entity_data.cells.as_mut().unwrap().mass(),
&collisions,
);
// update the entity's position
let rb = ctx
.rb_manager
.physics_manager
.world
.bodies
.get_mut(update_ctx.entity_data.rb_h.unwrap())
.unwrap();
rb.set_linvel(movement.translation / delta_time, true);
self.facing_strength = (self.facing_strength + movement.translation.x).clamp(-2.0, 2.0);
if self.facing_strength > 1.0 {
self.set_facing_dir(update_ctx, FacingDirection::Right);
} else if self.facing_strength < -1.0 {
self.set_facing_dir(update_ctx, FacingDirection::Left);
}
self.grounded = movement.grounded;
}
}
pub fn entity_wizard_def(position: Vec2) -> EntityDef {
let mut kinematic_controller = KinematicCharacterController::default();
kinematic_controller.up = -Vec2::Y;
kinematic_controller.autostep = Some(CharacterAutostep {
max_height: CharacterLength::Absolute(4.0),
min_width: CharacterLength::Absolute(8.0),
include_dynamic_bodies: false,
});
kinematic_controller.offset = CharacterLength::Absolute(0.1);
kinematic_controller.normal_nudge_factor = 1.0e-3;
// slightly greater than 45 since 45 deg piles are very common for any kind of sand or dirt etc
kinematic_controller.max_slope_climb_angle = 48f32.to_radians();
EntityDef::kinematic_from_sprite(
position,
"assets/sprites/wizard",
Some(Box::new(WizardEntityBehaviour {
movement_input_x: 0.0,
jump: 0.0,
grounded: false,
acc_vel: Vec2::ZERO,
kinematic_controller,
facing_direction: FacingDirection::Right,
facing_strength: 0.0,
})),
)
}
|
