textures.rs

use bevy::prelude::*;
use bevy_voxel_world::prelude::*;
use std::sync::Arc;

// Declare materials as consts for convenience
// This can also be an enum or other type, see the `textures_custom_idx.rs` example
const SNOWY_BRICK: u8 = 0;
const FULL_BRICK: u8 = 1;
const GRASS: u8 = 2;

#[derive(Resource, Clone, Default)]
struct MyMainWorld;

impl VoxelWorldConfig for MyMainWorld {
    type MaterialIndex = u8;
    type ChunkUserBundle = ();

    fn texture_index_mapper(
        &self,
    ) -> Arc<dyn Fn(Self::MaterialIndex) -> [u32; 3] + Send + Sync> {
        Arc::new(|vox_mat| match vox_mat {
            SNOWY_BRICK => [0, 1, 2],
            FULL_BRICK => [2, 2, 2],
            GRASS => [3, 3, 3],
            _ => [3, 3, 3],
        })
    }

    fn voxel_texture(&self) -> Option<(String, u32)> {
        Some(("example_voxel_texture.png".into(), 4))
    }
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        // We can specify a custom texture when initializing the plugin.
        // This should just be a path to an image in your assets folder.
        .add_plugins(VoxelWorldPlugin::with_config(MyMainWorld))
        .add_systems(Startup, (setup, create_voxel_scene).chain())
        .run();
}

fn setup(mut commands: Commands) {
    // Camera
    commands.spawn((
        Camera3d::default(),
        Transform::from_xyz(10.0, 10.0, 10.0).looking_at(Vec3::ZERO, Vec3::Y),
        // This tells bevy_voxel_world to use this cameras transform to calculate spawning area
        VoxelWorldCamera::<MyMainWorld>::default(),
    ));

    // light
    commands.spawn((
        PointLight {
            shadows_enabled: true,
            ..default()
        },
        Transform::from_xyz(4.0, 8.0, 4.0),
    ));
}

fn create_voxel_scene(mut voxel_world: VoxelWorld<MyMainWorld>) {
    // Then we can use the `u8` consts to specify the type of voxel

    // 20 by 20 floor
    for x in -10..10 {
        for z in -10..10 {
            voxel_world.set_voxel(IVec3::new(x, -1, z), WorldVoxel::Solid(GRASS));
            // Grassy floor
        }
    }

    // Some bricks
    voxel_world.set_voxel(IVec3::new(0, 0, 0), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(1, 0, 0), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(0, 0, 1), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(0, 0, -1), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(-1, 0, 0), WorldVoxel::Solid(FULL_BRICK));
    voxel_world.set_voxel(IVec3::new(-2, 0, 0), WorldVoxel::Solid(FULL_BRICK));
    voxel_world.set_voxel(IVec3::new(-1, 1, 0), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(-2, 1, 0), WorldVoxel::Solid(SNOWY_BRICK));
    voxel_world.set_voxel(IVec3::new(0, 1, 0), WorldVoxel::Solid(SNOWY_BRICK));
}