forked from StrafesNET/strafe-client
256 lines
7.2 KiB
Rust
256 lines
7.2 KiB
Rust
use crate::event::EventStruct;
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pub struct Body {
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pub position: glam::Vec3,//I64 where 2^32 = 1 u
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pub velocity: glam::Vec3,//I64 where 2^32 = 1 u/s
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pub time: TIME,//nanoseconds x xxxxD!
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}
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pub struct PhysicsState {
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pub body: Body,
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pub contacts: Vec<RelativeCollision>,
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pub models_cringe_clone: Vec<Model>,
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pub time: TIME,
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pub strafe_tick_num: TIME,
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pub strafe_tick_den: TIME,
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pub tick: u32,
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pub mv: f32,
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pub walkspeed: f32,
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pub friction: f32,
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pub gravity: glam::Vec3,
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pub grounded: bool,
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pub jump_trying: bool,
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}
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#[derive(Clone,Copy)]
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enum AabbFace{
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Right,//+X
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Top,
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Back,
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Left,
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Bottom,
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Front,
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}
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struct Aabb {
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min: glam::Vec3,
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max: glam::Vec3,
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}
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impl Aabb {
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// const FACE_DATA: [[f32; 3]; 6] = [
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// [0.0f32, 0., 1.],
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// [0.0f32, 0., -1.],
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// [1.0f32, 0., 0.],
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// [-1.0f32, 0., 0.],
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// [0.0f32, 1., 0.],
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// [0.0f32, -1., 0.],
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// ];
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const VERTEX_DATA_RIGHT: &'static [glam::Vec3; 4] = &[
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glam::vec3(1., -1., -1.),
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glam::vec3(1., 1., -1.),
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glam::vec3(1., 1., 1.),
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glam::vec3(1., -1., 1.),
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];
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const VERTEX_DATA_TOP: &'static [glam::Vec3; 4] = &[
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glam::vec3(1., 1., -1.),
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glam::vec3(-1., 1., -1.),
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glam::vec3(-1., 1., 1.),
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glam::vec3(1., 1., 1.),
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];
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const VERTEX_DATA_BACK: &'static [glam::Vec3; 4] = &[
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glam::vec3(-1., -1., 1.),
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glam::vec3(1., -1., 1.),
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glam::vec3(1., 1., 1.),
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glam::vec3(-1., 1., 1.),
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];
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const VERTEX_DATA_LEFT: &'static [glam::Vec3; 4] = &[
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glam::vec3(-1., -1., 1.),
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glam::vec3(-1., 1., 1.),
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glam::vec3(-1., 1., -1.),
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glam::vec3(-1., -1., -1.),
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];
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const VERTEX_DATA_BOTTOM: &'static [glam::Vec3; 4] = &[
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glam::vec3(1., -1., 1.),
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glam::vec3(-1., -1., 1.),
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glam::vec3(-1., -1., -1.),
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glam::vec3(1., -1., -1.),
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];
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const VERTEX_DATA_FRONT: &'static [glam::Vec3; 4] = &[
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glam::vec3(-1., 1., -1.),
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glam::vec3(1., 1., -1.),
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glam::vec3(1., -1., -1.),
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glam::vec3(-1., -1., -1.),
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];
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pub fn new() -> Self {
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Self {min: glam::Vec3::INFINITY,max: glam::Vec3::NEG_INFINITY}
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}
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pub fn grow(&mut self, point:glam::Vec3){
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self.min=self.min.min(point);
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self.max=self.max.max(point);
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}
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pub fn normal(face:AabbFace) -> glam::Vec3 {
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match face {
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AabbFace::Right => glam::vec3(1.,0.,0.),
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AabbFace::Top => glam::vec3(0.,1.,0.),
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AabbFace::Back => glam::vec3(0.,0.,1.),
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AabbFace::Left => glam::vec3(-1.,0.,0.),
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AabbFace::Bottom => glam::vec3(0.,-1.,0.),
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AabbFace::Front => glam::vec3(0.,0.,-1.),
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}
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}
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pub fn face_vertices(face:AabbFace) -> &'static [glam::Vec3;4] {
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match face {
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AabbFace::Right => Self::VERTEX_DATA_RIGHT,
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AabbFace::Top => Self::VERTEX_DATA_TOP,
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AabbFace::Back => Self::VERTEX_DATA_BACK,
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AabbFace::Left => Self::VERTEX_DATA_LEFT,
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AabbFace::Bottom => Self::VERTEX_DATA_BOTTOM,
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AabbFace::Front => Self::VERTEX_DATA_FRONT,
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}
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}
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}
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type Face = AabbFace;
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type TreyMesh = Aabb;
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pub struct Model {
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//A model is a thing that has a hitbox. can be represented by a list of TreyMesh-es
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//in this iteration, all it needs is extents.
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transform: glam::Mat4,
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}
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impl Model {
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pub fn face_vertices(&self,face:Face) -> &'static [glam::Vec3;4] {
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Aabb::face_vertices(face)
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}
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pub fn face_mesh(&self,face:Face) -> TreyMesh {
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let mut aabb=Aabb::new();
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for &vertex in self.face_vertices(face).iter() {
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aabb.grow(vertex);
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}
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return aabb;
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}
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pub fn face_normal(&self,face:Face) -> glam::Vec3 {
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let mut n=glam::Vec3Swizzles::xyzz(Aabb::normal(face));
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n.w=0.0;//what a man will do to avoid writing out the components
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glam::Vec4Swizzles::xyz(self.transform*n)//this is wrong for scale
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}
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}
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pub struct RelativeCollision {
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face: Face,//just an id
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model: u32,//using id to avoid lifetimes
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}
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impl RelativeCollision {
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pub fn mesh(&self,models:&Vec<Model>) -> TreyMesh {
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return models.get(self.model as usize).unwrap().face_mesh(self.face)
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}
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pub fn normal(&self,models:&Vec<Model>) -> glam::Vec3 {
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return models.get(self.model as usize).unwrap().face_normal(self.face)
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}
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}
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pub type TIME = i64;
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const CONTROL_JUMP:u32 = 0b01000000;//temp
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impl PhysicsState {
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//delete this, we are tickless gamers
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pub fn run(&mut self, time: TIME, control_dir: glam::Vec3, controls: u32){
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let target_tick = (time*self.strafe_tick_num/self.strafe_tick_den) as u32;
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//the game code can run for 1 month before running out of ticks
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while self.tick<target_tick {
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self.tick += 1;
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let dt=0.01;
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let d=self.body.velocity.dot(control_dir);
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if d<self.mv {
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self.body.velocity+=(self.mv-d)*control_dir;
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}
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self.body.velocity+=self.gravity*dt;
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self.body.position+=self.body.velocity*dt;
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if self.body.position.y<0.0{
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self.body.position.y=0.0;
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self.body.velocity.y=0.0;
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self.grounded=true;
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}
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if self.grounded&&(controls&CONTROL_JUMP)!=0 {
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self.grounded=false;
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self.body.velocity+=glam::Vec3::new(0.0,0.715588/2.0*100.0,0.0);
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}
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if self.grounded {
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let applied_friction=self.friction*dt;
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let targetv=control_dir*self.walkspeed;
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let diffv=targetv-self.body.velocity;
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if applied_friction*applied_friction<diffv.length_squared() {
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self.body.velocity+=applied_friction*diffv.normalize();
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} else {
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//EventEnum::WalkTargetReached
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self.body.velocity=targetv;
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}
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}
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}
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self.body.time=target_tick as TIME*self.strafe_tick_den/self.strafe_tick_num;
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}
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//delete this
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pub fn extrapolate_position(&self, time: TIME) -> glam::Vec3 {
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let dt=(time-self.body.time) as f64/1_000_000_000f64;
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self.body.position+self.body.velocity*(dt as f32)+self.gravity*((0.5*dt*dt) as f32)
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}
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fn next_strafe_event(&self) -> Option<EventStruct> {
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return Some(EventStruct{
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time:(self.time*self.strafe_tick_num/self.strafe_tick_den+1)*self.strafe_tick_den/self.strafe_tick_num,
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event:crate::event::EventEnum::StrafeTick
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});
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}
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fn next_walk_event(&self) -> Option<EventStruct> {
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//check if you are accelerating towards a walk target velocity and create an event
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return None;
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}
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fn predict_collision_end(&self,model:&Model) -> Option<EventStruct> {
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None
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}
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fn predict_collision_start(&self,model:&Model) -> Option<EventStruct> {
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None
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}
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}
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impl crate::event::EventTrait for PhysicsState {
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//this little next event function can cache its return value and invalidate the cached value by watching the State.
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fn next_event(&self) -> Option<EventStruct> {
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//JUST POLLING!!! NO MUTATION
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let mut best = crate::event::EventCollector::new();
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//autohop (already pressing spacebar; the signal to begin trying to jump is different)
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if self.grounded&&self.jump_trying {
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//scroll will be implemented with InputEvent::Jump(true) but it blocks setting self.jump_trying=true
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best.collect(Some(EventStruct{
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time:self.time,
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event:crate::event::EventEnum::Jump
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}));
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}
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//check for collision stop events with curent contacts
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for collision_data in self.contacts.iter() {
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best.collect(self.predict_collision_end(self.models_cringe_clone.get(collision_data.model as usize).unwrap()));
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}
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//check for collision start events (against every part in the game with no optimization!!)
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for model in &self.models_cringe_clone {
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best.collect(self.predict_collision_start(model));
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}
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if self.grounded {
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//walk maintenance
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best.collect(self.next_walk_event());
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}else{
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//check to see when the next strafe tick is
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best.collect(self.next_strafe_event());
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}
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best.event()
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}
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}
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