Add feature equivalence to abdea34c8e81676861df2ccd9e789eaf3c828d9f

Cargo.toml

@@ -8,5 +8,7 @@ edition = "2021"
 [dependencies.save]
 path = "save"
 
-[dependencies.serde-xml-rs]
-version = "0.5.1"
+[dependencies.bevy]
+version = "0.8"
+default-features = false
+features = ["bevy_asset", "bevy_winit", "bevy_scene", "render"]

save/Cargo.toml

@@ -3,8 +3,13 @@ name = "save"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[dependencies.noise]
+version = "0.7.0"
+default-features = false
 
-[dependencies.serde]
-version = "1.0.144"
-features = ["derive"]
+[dependencies.rand]
+version = "0.8.5"
+
+[dependencies.bevy]
+version = "0.8"
+default-features = false

save/src/math_util.rs

@@ -0,0 +1,71 @@
+use std::{
+    error::Error,
+    f32::consts::{PI, TAU},
+    fmt::{Debug, Display},
+};
+
+use bevy::math::Vec3A;
+use rand::Rng;
+
+#[derive(Debug, Copy, Clone)]
+pub enum CartesianError {
+    InvalidAlpha(f32),
+}
+impl Error for CartesianError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        None
+    }
+
+    fn description(&self) -> &str {
+        "description() is deprecated; use Display"
+    }
+
+    fn cause(&self) -> Option<&dyn Error> {
+        self.source()
+    }
+}
+impl Display for CartesianError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            CartesianError::InvalidAlpha(alpha) => {
+                f.write_fmt(format_args!("Alpha value must be [0..PI], was {}", alpha))
+            }
+        }
+    }
+}
+
+pub fn cartesian_coordinates(alpha: f32, beta: f32, radius: f32) -> Result<Vec3A, CartesianError> {
+    if alpha < 0.0 || alpha > PI {
+        return Err(CartesianError::InvalidAlpha(alpha));
+    }
+    let mut beta = beta.clone();
+
+    while beta < 0.0 {
+        beta += PI;
+    }
+    while beta >= TAU {
+        beta -= TAU;
+    }
+
+    let sin_alpha = f32::sin(alpha);
+
+    Ok(Vec3A::new(
+        sin_alpha * f32::cos(beta) * radius,
+        f32::cos(alpha) * radius,
+        sin_alpha * f32::sin(beta) * radius,
+    ))
+}
+
+pub fn random_point_in_sphere(radius: f32) -> Vec3A {
+    let mut rng = rand::thread_rng();
+    let x = rng.gen_range(-radius..radius);
+    let y = rng.gen_range(-radius..radius);
+    let z = rng.gen_range(-radius..radius);
+    let mult = 1.0 / (x * x + y * y + z * z).sqrt();
+
+    if x == 0.0 && y == 0.0 && z == 0.0 {
+        return Vec3A::X;
+    }
+
+    Vec3A::new(mult * x, mult * y, mult * z)
+}

save/src/world.rs

@@ -0,0 +1,135 @@
+use std::{
+    error::Error,
+    f32::consts::{PI, TAU},
+    fmt::Display,
+};
+
+use noise::{NoiseFn, Perlin, Seedable};
+
+use crate::{cartesian_coordinates, random_point_in_sphere, CartesianError};
+
+#[derive(Debug, Clone, Copy)]
+pub enum WorldGenError {
+    CartesianError(CartesianError),
+}
+impl Error for WorldGenError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match *self {
+            WorldGenError::CartesianError(ref e) => Some(e),
+        }
+    }
+
+    fn description(&self) -> &str {
+        "description() is deprecated; use Display"
+    }
+
+    fn cause(&self) -> Option<&dyn Error> {
+        self.source()
+    }
+}
+impl Display for WorldGenError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            WorldGenError::CartesianError(err) => err.fmt(f),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct World {
+    pub width: i32,
+    pub height: i32,
+    pub seed: u32,
+
+    pub terrain: Vec<Vec<TerrainCell>>,
+}
+
+#[derive(Debug, Copy, Clone, Default)]
+pub struct TerrainCell {
+    pub altitude: f32,
+    pub rainfall: f32,
+}
+
+impl World {
+    pub fn new(width: i32, height: i32, seed: u32) -> World {
+        let terrain = vec![
+            vec![TerrainCell::default(); width.try_into().unwrap()];
+            height.try_into().unwrap()
+        ];
+
+        World {
+            width,
+            height,
+            seed,
+            terrain,
+        }
+    }
+
+    pub const MIN_ALTITUDE: f32 = -10000.0;
+    pub const MAX_ALTITUDE: f32 = 10000.0;
+    pub const ALTITUDE_SPAN: f32 = Self::MAX_ALTITUDE - Self::MIN_ALTITUDE;
+
+    pub const MIN_RAINFALL: f32 = -10.0;
+    pub const MAX_RAINFALL: f32 = 100.0;
+    pub const RAINFALL_SPAN: f32 = Self::MAX_RAINFALL - Self::MIN_RAINFALL;
+    pub const RAINFALL_ALTITUDE_FACTOR: f32 = 1.0;
+
+    pub fn generate(&mut self) -> Result<(), WorldGenError> {
+        let perlin = Perlin::new().set_seed(self.seed);
+
+        if let Err(err) = self.generate_altitude(&perlin) {
+            return Err(WorldGenError::CartesianError(err));
+        }
+        if let Err(err) = self.generate_rainfall(&perlin) {
+            return Err(WorldGenError::CartesianError(err));
+        }
+
+        Ok(())
+    }
+    fn generate_altitude(&mut self, perlin: &Perlin) -> Result<(), CartesianError> {
+        let offset = random_point_in_sphere(1000.0);
+        const RADIUS: f32 = 2.0;
+
+        for (y, row) in self.terrain.iter_mut().enumerate() {
+            let alpha = (y as f32 / self.height as f32) * PI;
+
+            for (x, cell) in row.iter_mut().enumerate() {
+                let beta = (x as f32 / self.width as f32) * TAU;
+                let pos = cartesian_coordinates(alpha, beta, RADIUS)? + offset;
+
+                let value = Perlin::get(perlin, [pos.x.into(), pos.y.into(), pos.z.into()]) as f32;
+
+                let altitude = Self::MIN_ALTITUDE + (value * Self::ALTITUDE_SPAN);
+
+                cell.altitude = altitude;
+            }
+        }
+        Ok(())
+    }
+
+    fn generate_rainfall(&mut self, perlin: &Perlin) -> Result<(), CartesianError> {
+        let offset = random_point_in_sphere(1000.0);
+        const RADIUS: f32 = 2.0;
+
+        for (y, row) in self.terrain.iter_mut().enumerate() {
+            let alpha = (y as f32 / self.height as f32) * PI;
+            for (x, cell) in row.iter_mut().enumerate() {
+                let beta = (x as f32 / self.width as f32) * TAU;
+
+                let pos = cartesian_coordinates(alpha, beta, RADIUS)? + offset;
+
+                let value = Perlin::get(perlin, [pos.x.into(), pos.y.into(), pos.z.into()]) as f32;
+
+                let base_rainfall = (value * Self::RAINFALL_SPAN + Self::MIN_RAINFALL)
+                    .clamp(0.0, World::MAX_RAINFALL);
+                let altitude_factor = ((cell.altitude / Self::MAX_ALTITUDE)
+                    * World::RAINFALL_ALTITUDE_FACTOR)
+                    .clamp(0.0, 1.0);
+                let rainfall = base_rainfall * (1.0 - altitude_factor);
+
+                cell.rainfall = rainfall;
+            }
+        }
+        Ok(())
+    }
+}

save/src/world_manager.rs

@@ -0,0 +1,21 @@
+use crate::{World, WorldGenError};
+use rand::random;
+
+#[derive(Debug)]
+pub struct WorldManager {
+    world: Option<World>,
+}
+impl WorldManager {
+    pub fn new() -> WorldManager {
+        WorldManager { world: None }
+    }
+    pub fn get_world(&self) -> Option<&World> {
+        self.world.as_ref()
+    }
+    pub fn new_world(&mut self) -> Result<&World, WorldGenError> {
+        let mut new_world = World::new(800, 600, random());
+        new_world.generate()?;
+        self.world = Some(new_world);
+        Ok(self.get_world().unwrap())
+    }
+}

src/main.rs

@@ -1,12 +1,182 @@
-use save::Save;
-use std::fs;
+#![warn(absolute_paths_not_starting_with_crate)]
+// #![warn(box_pointers)]
+#![warn(elided_lifetimes_in_paths)]
+#![warn(explicit_outlives_requirements)]
+#![warn(keyword_idents)]
+#![warn(macro_use_extern_crate)]
+#![warn(meta_variable_misuse)]
+#![warn(missing_abi)]
+#![warn(missing_copy_implementations)]
+#![warn(missing_debug_implementations)]
+// #![warn(missing_docs)]
+#![warn(non_ascii_idents)]
+#![warn(noop_method_call)]
+#![warn(pointer_structural_match)]
+#![warn(rust_2021_incompatible_closure_captures)]
+#![warn(rust_2021_incompatible_or_patterns)]
+#![warn(rust_2021_prefixes_incompatible_syntax)]
+#![warn(rust_2021_prelude_collisions)]
+#![warn(single_use_lifetimes)]
+#![warn(trivial_casts)]
+#![warn(trivial_numeric_casts)]
+#![warn(unreachable_pub)]
+#![warn(unsafe_code)]
+#![warn(unsafe_op_in_unsafe_fn)]
+#![warn(unstable_features)]
+#![warn(unused_crate_dependencies)]
+#![warn(unused_extern_crates)]
+#![warn(unused_import_braces)]
+#![warn(unused_lifetimes)]
+#![warn(unused_macro_rules)]
+#![warn(unused_qualifications)]
+#![warn(unused_results)]
+#![warn(variant_size_differences)]
 
-use serde_xml_rs::from_reader;
+use bevy::{
+    app::App,
+    asset::Assets,
+    core_pipeline::core_2d::Camera2dBundle,
+    diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
+    ecs::{
+        change_detection::ResMut,
+        system::{Commands, Res},
+    },
+    hierarchy::BuildChildren,
+    render::{
+        color::Color,
+        render_resource::{
+            Extent3d, TextureDescriptor, TextureDimension, TextureFormat, TextureUsages,
+        },
+        texture::{Image, ImageSettings},
+    },
+    ui::{
+        entity::{ImageBundle, NodeBundle},
+        Size, Style, UiImage, Val,
+    },
+    utils::default,
+    window::WindowDescriptor,
+    winit::WinitSettings,
+    DefaultPlugins,
+};
+use save::*;
 
-fn main() {
-    println!("Start");
-    let planet_file = fs::File::open("planet.plnt").unwrap();
-    println!("Opened");
-    let planet: Save = from_reader(planet_file).unwrap();
-    println!("Deserialized!");
+fn get_color(cell: &TerrainCell) -> Color {
+    let altitude_color = gen_altitude_color(cell.altitude);
+    let rainfall_color = gen_rainfall_color(cell.rainfall);
+
+    let normalized_rainfall = f32::max(cell.rainfall / World::MAX_RAINFALL, 0.0);
+
+    let red = (altitude_color.r() * (1.0 - normalized_rainfall))
+        + rainfall_color.r() * normalized_rainfall;
+    let green = (altitude_color.g() * (1.0 - normalized_rainfall))
+        + rainfall_color.g() * normalized_rainfall;
+    let blue = (altitude_color.b() * (1.0 - normalized_rainfall))
+        + rainfall_color.b() * normalized_rainfall;
+
+    Color::rgb(red, green, blue)
+}
+
+fn gen_altitude_color(altitude: f32) -> Color {
+    if altitude < 0.0 {
+        Color::BLUE
+    } else {
+        let mult = (altitude - World::MIN_ALTITUDE) / World::ALTITUDE_SPAN;
+
+        Color::rgb(0.58 * mult, 0.29 * mult, 0.0)
+    }
+}
+
+fn gen_rainfall_color(rainfall: f32) -> Color {
+    if rainfall < 0.0 {
+        Color::BLACK
+    } else {
+        let mult = rainfall / World::MAX_RAINFALL;
+        Color::GREEN * mult
+    }
+}
+
+fn generate_texture(
+    mut commands: Commands<'_, '_>,
+    mut images: ResMut<'_, Assets<Image>>,
+    world_manager: Res<'_, WorldManager>,
+) {
+    let world = world_manager.get_world().unwrap();
+    let terrain_cells: Vec<_> = world.terrain.iter().rev().flatten().collect();
+    let colors: Vec<_> = terrain_cells.iter().map(|cell| get_color(cell)).collect();
+    let data: Vec<_> = colors
+        .iter()
+        .flat_map(|color| {
+            color
+                .as_rgba_f32()
+                .iter()
+                .flat_map(|num| num.to_le_bytes())
+                .collect::<Vec<u8>>()
+        })
+        .collect();
+
+    let image_handle = images.add(Image {
+        data,
+        texture_descriptor: TextureDescriptor {
+            label: None,
+            size: Extent3d {
+                width: world.width as u32,
+                height: world.height as u32,
+                ..default()
+            },
+            dimension: TextureDimension::D2,
+            format: TextureFormat::Rgba32Float,
+            mip_level_count: 1,
+            sample_count: 1,
+            usage: TextureUsages::COPY_DST | TextureUsages::TEXTURE_BINDING,
+        },
+        ..default()
+    });
+
+    _ = commands.spawn_bundle(Camera2dBundle::default());
+    _ = commands
+        .spawn_bundle(NodeBundle {
+            style: Style {
+                size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
+                ..default()
+            },
+            color: Color::NONE.into(),
+            ..default()
+        })
+        .with_children(|parent| {
+            _ = parent.spawn_bundle(ImageBundle {
+                style: Style {
+                    size: Size::new(Val::Percent(100.0), Val::Percent(100.0)),
+                    ..default()
+                },
+                image: UiImage(image_handle),
+                ..default()
+            });
+            // });
+        });
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut manager = WorldManager::new();
+    let world = manager.new_world()?;
+
+    App::new()
+        // Only run the app when there is user input. This will significantly reduce CPU/GPU use.
+        .insert_resource(WinitSettings::desktop_app())
+        // Use nearest-neighbor rendering for cripsier pixels
+        .insert_resource(ImageSettings::default_nearest())
+        .insert_resource(WindowDescriptor {
+            width: world.width as f32,
+            height: world.height as f32,
+            title: String::from("World-RS"),
+            resizable: true,
+            ..default()
+        })
+        .insert_resource(manager)
+        .add_startup_system(generate_texture)
+        .add_plugins(DefaultPlugins)
+        .add_plugin(LogDiagnosticsPlugin::default())
+        .add_plugin(FrameTimeDiagnosticsPlugin::default())
+        .run();
+
+    Ok(())
 }