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281 lines
9.0 KiB
Rust
281 lines
9.0 KiB
Rust
use crate::{all::ForestKind, sim::LocationInfo, util::Sampler, World, CONFIG};
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use common::{terrain::TerrainChunkSize, vol::VolSize};
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use noise::NoiseFn;
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use std::{
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f32,
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ops::{Add, Div, Mul, Neg, Sub},
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};
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use vek::*;
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pub struct ColumnGen<'a> {
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world: &'a World,
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}
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impl<'a> ColumnGen<'a> {
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pub fn new(world: &'a World) -> Self {
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Self { world }
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}
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}
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impl<'a> Sampler for ColumnGen<'a> {
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type Index = Vec2<i32>;
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type Sample = Option<ColumnSample<'a>>;
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fn get(&self, wpos: Vec2<i32>) -> Option<ColumnSample<'a>> {
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let wposf = wpos.map(|e| e as f64);
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let chunk_pos = wpos.map2(Vec2::from(TerrainChunkSize::SIZE), |e, sz: u32| {
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e / sz as i32
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});
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let sim = self.world.sim();
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let turb = Vec2::new(
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sim.gen_ctx.turb_x_nz.get((wposf.div(48.0)).into_array()) as f32,
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sim.gen_ctx.turb_y_nz.get((wposf.div(48.0)).into_array()) as f32,
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) * 12.0;
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let wposf_turb = wposf + turb.map(|e| e as f64);
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let alt_base = sim.get_interpolated(wpos, |chunk| chunk.alt_base)?;
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let chaos = sim.get_interpolated(wpos, |chunk| chunk.chaos)?;
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let temp = sim.get_interpolated(wpos, |chunk| chunk.temp)?;
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let dryness = sim.get_interpolated(wpos, |chunk| chunk.dryness)?;
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let rockiness = sim.get_interpolated(wpos, |chunk| chunk.rockiness)?;
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let tree_density = sim.get_interpolated(wpos, |chunk| chunk.tree_density)?;
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let spawn_rate = sim.get_interpolated(wpos, |chunk| chunk.spawn_rate)?;
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let sim_chunk = sim.get(chunk_pos)?;
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const RIVER_PROPORTION: f32 = 0.025;
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let river = dryness
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.abs()
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.neg()
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.add(RIVER_PROPORTION)
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.div(RIVER_PROPORTION)
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.max(0.0)
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.mul((1.0 - (chaos - 0.15) * 20.0).max(0.0).min(1.0));
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let cliff_hill =
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(sim.gen_ctx.small_nz.get((wposf.div(128.0)).into_array()) as f32).mul(16.0);
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let riverless_alt = sim.get_interpolated(wpos, |chunk| chunk.alt)?
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+ (sim.gen_ctx.small_nz.get((wposf.div(256.0)).into_array()) as f32)
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.abs()
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.mul(chaos.max(0.2))
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.mul(64.0);
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let cliffs = sim_chunk.cliffs;
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let alt = riverless_alt
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- (1.0 - river)
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.mul(f32::consts::PI)
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.cos()
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.add(1.0)
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.mul(0.5)
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.mul(24.0);
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let water_level = (riverless_alt - 4.0 - 5.0 * chaos).max(CONFIG.sea_level);
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let rock = (sim.gen_ctx.small_nz.get(
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Vec3::new(wposf.x, wposf.y, alt as f64)
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.div(100.0)
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.into_array(),
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) as f32)
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.mul(rockiness)
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.sub(0.4)
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.max(0.0)
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.mul(8.0);
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let wposf3d = Vec3::new(wposf.x, wposf.y, alt as f64);
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let marble_small = (sim.gen_ctx.hill_nz.get((wposf3d.div(3.0)).into_array()) as f32)
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.add(1.0)
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.mul(0.5);
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let marble = (sim.gen_ctx.hill_nz.get((wposf3d.div(48.0)).into_array()) as f32)
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.mul(0.75)
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.add(1.0)
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.mul(0.5)
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.add(marble_small.sub(0.5).mul(0.25));
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// Colours
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let cold_grass = Rgb::new(0.0, 0.25, 0.13);
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let warm_grass = Rgb::new(0.18, 0.65, 0.0);
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let cold_stone = Rgb::new(0.55, 0.7, 0.75);
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let warm_stone = Rgb::new(0.65, 0.65, 0.35);
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let beach_sand = Rgb::new(0.93, 0.84, 0.4);
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let desert_sand = Rgb::new(0.98, 0.8, 0.15);
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let snow = Rgb::broadcast(1.0);
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let grass = Rgb::lerp(cold_grass, warm_grass, marble);
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let sand = Rgb::lerp(beach_sand, desert_sand, marble);
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let cliff = Rgb::lerp(cold_stone, warm_stone, marble);
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let dirt = Lerp::lerp(Rgb::new(0.2, 0.1, 0.05), Rgb::new(0.4, 0.25, 0.0), marble);
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let turf = grass;
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let ground = Rgb::lerp(
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Rgb::lerp(
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snow,
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turf,
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temp.sub(CONFIG.snow_temp)
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.sub((marble - 0.5) * 0.05)
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.mul(256.0),
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),
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sand,
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temp.sub(CONFIG.desert_temp).mul(32.0),
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);
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// Work out if we're on a path or near a town
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let dist_to_path = match &sim_chunk.location {
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Some(loc) => {
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let this_loc = &sim.locations[loc.loc_idx];
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this_loc
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.neighbours
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.iter()
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.map(|j| {
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let other_loc = &sim.locations[*j];
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// Find the two location centers
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let near_0 = this_loc.center.map(|e| e as f32);
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let near_1 = other_loc.center.map(|e| e as f32);
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// Calculate distance to path between them
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(0.0 + (near_1.y - near_0.y) * wposf_turb.x as f32
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- (near_1.x - near_0.x) * wposf_turb.y as f32
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+ near_1.x * near_0.y
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- near_0.x * near_1.y)
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.abs()
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.div(near_0.distance(near_1))
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})
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.filter(|x| x.is_finite())
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.min_by(|a, b| a.partial_cmp(b).unwrap())
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.unwrap_or(f32::INFINITY)
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}
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None => f32::INFINITY,
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};
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let on_path = dist_to_path < 5.0 && !sim_chunk.near_cliffs; // || near_0.distance(wposf_turb.map(|e| e as f32)) < 150.0;
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let (alt, ground) = if on_path {
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(alt - 1.0, dirt)
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} else {
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(alt, ground)
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};
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// Cities
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// TODO: In a later MR
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/*
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let building = match &sim_chunk.location {
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Some(loc) => {
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let loc = &sim.locations[loc.loc_idx];
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let rpos = wposf.map2(loc.center, |a, b| a as f32 - b as f32) / 256.0 + 0.5;
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if rpos.map(|e| e >= 0.0 && e < 1.0).reduce_and() {
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(loc.settlement
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.get_at(rpos)
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.map(|b| b.seed % 20 + 10)
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.unwrap_or(0)) as f32
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} else {
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0.0
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}
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}
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None => 0.0,
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};
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let alt = alt + building;
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*/
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// Caves
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let cave_at = |wposf: Vec2<f64>| {
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(sim.gen_ctx.cave_0_nz.get(
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Vec3::new(wposf.x, wposf.y, alt as f64 * 8.0)
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.div(800.0)
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.into_array(),
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) as f32)
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.powf(2.0)
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.neg()
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.add(1.0)
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.mul((1.15 - chaos).min(1.0))
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};
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let cave_xy = cave_at(wposf);
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let cave_alt = alt - 24.0
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+ (sim
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.gen_ctx
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.cave_1_nz
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.get(Vec2::new(wposf.x, wposf.y).div(48.0).into_array()) as f32)
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* 8.0
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+ (sim
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.gen_ctx
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.cave_1_nz
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.get(Vec2::new(wposf.x, wposf.y).div(500.0).into_array()) as f32)
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.add(1.0)
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.mul(0.5)
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.powf(15.0)
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.mul(150.0);
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Some(ColumnSample {
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alt,
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chaos,
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water_level,
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river,
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surface_color: Rgb::lerp(
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sand,
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// Land
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Rgb::lerp(
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ground,
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// Mountain
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Rgb::lerp(
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cliff,
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snow,
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(alt - CONFIG.sea_level
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- 0.35 * CONFIG.mountain_scale
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- alt_base
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- temp * 96.0
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- marble * 24.0)
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/ 12.0,
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),
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(alt - CONFIG.sea_level - 0.3 * CONFIG.mountain_scale + marble * 128.0) / 100.0,
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),
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// Beach
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((alt - CONFIG.sea_level - 2.0) / 5.0).min(1.0 - river * 2.0),
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),
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sub_surface_color: dirt,
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tree_density,
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forest_kind: sim_chunk.forest_kind,
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close_trees: sim.gen_ctx.tree_gen.get(wpos),
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cave_xy,
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cave_alt,
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rock,
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cliffs,
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cliff_hill,
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close_cliffs: sim.gen_ctx.cliff_gen.get(wpos),
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temp,
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spawn_rate,
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location: sim_chunk.location.as_ref(),
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})
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}
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}
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#[derive(Clone)]
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pub struct ColumnSample<'a> {
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pub alt: f32,
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pub chaos: f32,
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pub water_level: f32,
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pub river: f32,
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pub surface_color: Rgb<f32>,
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pub sub_surface_color: Rgb<f32>,
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pub tree_density: f32,
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pub forest_kind: ForestKind,
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pub close_trees: [(Vec2<i32>, u32); 9],
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pub cave_xy: f32,
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pub cave_alt: f32,
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pub rock: f32,
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pub cliffs: bool,
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pub cliff_hill: f32,
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pub close_cliffs: [(Vec2<i32>, u32); 9],
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pub temp: f32,
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pub spawn_rate: f32,
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pub location: Option<&'a LocationInfo>,
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}
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