78 lines
2.2 KiB
Rust
78 lines
2.2 KiB
Rust
use fastnoise_lite::{FastNoiseLite, FractalType};
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use godot::classes::class_macros::private::virtuals::Os::Vector3i;
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use crate::chunk::{Chunk, chunk::CHUNK_SIZE};
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pub struct SimpleSurfaceGenerator {
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noise: FastNoiseLite,
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surface_height: u32,
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}
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impl SimpleSurfaceGenerator {
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pub fn new(seed: i32, frequency: f32, surface_height: u32) -> Self {
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let mut noise = FastNoiseLite::new();
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noise.frequency = frequency;
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noise.noise_type = fastnoise_lite::NoiseType::OpenSimplex2;
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noise.seed = seed;
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noise.set_fractal_type(Some(FractalType::Ridged));
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noise.set_fractal_octaves(Some(4));
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Self {
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noise,
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surface_height,
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}
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}
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#[inline]
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pub fn normalize_value(value: f32) -> f32 {
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(value + 1.0) * 0.5 // [0, value]
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}
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}
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impl SimpleSurfaceGenerator {
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fn generate(&self, column: &mut Chunk) {
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let size_x = CHUNK_SIZE;
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let size_z = CHUNK_SIZE;
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let base_x = column.world_position.0 * size_x;
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let base_z = column.world_position.1 * size_z;
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let freq = 1.0 / 32.0;
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let column_height = CHUNK_SIZE * self.surface_height as i32;
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for x in 0..CHUNK_SIZE {
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for z in 0..CHUNK_SIZE {
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// world coordinates of this column
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let world_x = base_x + x;
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let world_z = base_z + z;
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let noise = self
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.noise
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.get_noise_2d(world_x as f32 * freq, world_z as f32 * freq);
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let noise = Self::normalize_value(noise);
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let height = (noise.powi(2) * column_height as f32) as i32;
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for y in 1..=height {
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column.set_voxel(Vector3i::new(world_x, y, world_z), true);
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}
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}
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}
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}
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fn sample_voxel(&self, pos: Vector3i) -> bool {
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let freq = 1.0 / 32.0;
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let noise = self
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.noise
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.get_noise_2d(pos.x as f32 * freq, pos.z as f32 * freq);
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let noise = Self::normalize_value(noise);
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let column_height = CHUNK_SIZE * self.surface_height as i32;
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let height = (noise.powi(2) * column_height as f32) as i32;
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pos.y <= height
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}
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}
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