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//! Implements a basic height map generator using 2D Perlin noise.

//! A superior generator would use 3D noise to allow for overhangs.

use crate::{block_index, DensityMapGenerator, NearbyBiomes, OCEAN_DEPTH, SKY_LIMIT};

use bitvec::order::Local;

use bitvec::vec::BitVec;

use feather_core::biomes::Biome;

use feather_core::util::ChunkPosition;

use simdnoise::NoiseBuilder;

use std::cmp::min;

/// Density map generator which simply uses a height map

/// using two-dimensional Perlin noise.

#[derive(Debug, Default)]

pub struct HeightMapGenerator;

impl DensityMapGenerator for HeightMapGenerator {

fn generate_for_chunk(

&self,

chunk: ChunkPosition,

biomes: &NearbyBiomes,

seed: u64,

) -> BitVec<Local, u8> {

let x_offset = (chunk.x * 16) as f32;

let y_offset = (chunk.z * 16) as f32;

let dim = 16;

let (elevation, _, _) = NoiseBuilder::gradient_2d_offset(x_offset, dim, y_offset, dim)

.with_seed(seed as i32)

.with_freq(0.01)

.generate();

let (detail, _, _) = NoiseBuilder::gradient_2d_offset(x_offset, dim, y_offset, dim)

.with_seed(seed as i32 + 1)

.generate();

let mut density_map = BitVec::from_vec(vec![0u8; 16 * 256 * 16 / 8]);

for x in 0..16 {

for z in 0..16 {

let biome = biomes.biome_at(x, z);

let index = (z << 4) | x;

let mut elevation = elevation[index].abs() * 400.0;

let detail = detail[index] * 50.0;

if biome == Biome::Ocean {

elevation -= OCEAN_DEPTH as f32;

}

let height = (elevation + detail + 64.0) as usize;

for y in 0..min(height, SKY_LIMIT) {

density_map.set(block_index(x, y, z), true);

}

density_map

}

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