minimum-viable-game-engine/src/runtime/state.rs

use std::collections::HashMap;
use std::fs;
use std::path::PathBuf;
use std::time::Instant;

use cgmath::{Euler, Quaternion};
use config::Config;
use config::File;
use legion::world::SubWorld;
use legion::IntoQuery;
use legion::*;
use nalgebra::Quaternion as naQuaternion;
use rapier3d::dynamics::{IntegrationParameters, JointSet, RigidBodySet};
use rapier3d::geometry::{BroadPhase, ColliderSet, NarrowPhase};
use rapier3d::pipeline::PhysicsPipeline;

use crate::camera::{Camera, CameraController};
use crate::components::{Collider, LoopState, Mesh, Physics, Position};
use crate::geometry::{load_obj, RawMesh};

pub struct EntityMeta {
    pub name: String,
    pub ent_type: String,
    pub mesh: String,
}

pub struct RuntimeState {
    config_db: Config,
    mesh_cache: HashMap<String, RawMesh>,
}

impl RuntimeState {
    pub fn new() -> RuntimeState {
        let mut settings = Config::default();
        settings
            // File::with_name(..) is shorthand for File::from(Path::new(..))
            .merge(File::with_name("conf/entity_spawns.toml"))
            .unwrap();

        RuntimeState {
            config_db: settings,
            mesh_cache: Default::default(),
        }
    }

    pub fn get_mesh(&mut self, mesh: &str) -> Option<&RawMesh> {
        self.mesh_cache.get(mesh)
    }

    pub fn get_configured_entities(&mut self) -> Vec<EntityMeta> {
        let mut out = Vec::new();
        for entity in self.config_db.get_array("entities").unwrap() {
            let table = entity.into_table().unwrap();
            out.push(EntityMeta {
                name: table.get("name").unwrap().kind.to_string(),
                ent_type: table.get("type").unwrap().kind.to_string(),
                mesh: table.get("mesh").unwrap().kind.to_string(),
            });
        }
        out
    }

    pub fn preload_meshes(&mut self, resources_path: PathBuf) {
        log::info!("Preloading meshes...");

        let paths = fs::read_dir(resources_path).unwrap();
        for file in paths {
            let file = file.unwrap();
            let filepath = file.path().clone();
            let filename = String::from(file.file_name().to_str().unwrap());

            if filename.ends_with(".obj") {
                let mesh = load_obj(filepath.to_str().unwrap()).unwrap();
                self.mesh_cache.insert(filename, mesh);
            }
        }
    }
}