rust/mapgen/src/lib.rs
author unC0Rr
Tue, 03 Sep 2024 13:56:35 +0200
branchtransitional_engine
changeset 16058 9cbd18220eb7
parent 16053 3402b2185698
child 16060 1b1d5729ff3e
permissions -rw-r--r--
Fix cavern templates
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mod template;
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pub mod theme;
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use self::theme::Theme;
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use crate::template::outline::TemplateCollectionDesc as OutlineTemplateCollectionDesc;
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use crate::template::wavefront_collapse::TemplateCollectionDesc as WfcTemplateCollectionDesc;
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use std::path::{Path, PathBuf};
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use land2d::Land2D;
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use landgen::{
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    outline_template_based::{
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        outline_template::OutlineTemplate, template_based::TemplatedLandGenerator,
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    },
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    wavefront_collapse::generator::{
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        TemplateDescription as WfcTemplate, WavefrontCollapseLandGenerator,
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    },
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    LandGenerationParameters, LandGenerator,
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};
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use rand::{seq::SliceRandom, Rng};
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use std::{borrow::Borrow, collections::hash_map::HashMap};
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use vec2d::Vec2D;
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#[derive(PartialEq, Eq, Hash, Clone, Debug)]
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struct TemplateType(String);
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impl Borrow<str> for TemplateType {
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    fn borrow(&self) -> &str {
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        self.0.as_str()
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    }
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}
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#[derive(Debug)]
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pub struct MapGenerator<T> {
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    pub(crate) templates: HashMap<TemplateType, Vec<T>>,
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    data_path: PathBuf,
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}
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impl<T> MapGenerator<T> {
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    pub fn new(data_path: &Path) -> Self {
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        Self {
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            templates: HashMap::new(),
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            data_path: data_path.to_owned(),
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        }
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    }
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    pub fn get_template<R: Rng>(&self, template_type: &str, rng: &mut R) -> Option<&T> {
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        self.templates
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            .get(template_type)
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            .and_then(|t| t.as_slice().choose(rng))
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    }
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    pub fn make_texture<LandT>(
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        &self,
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        land: &Land2D<LandT>,
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        parameters: &LandGenerationParameters<LandT>,
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        theme: &Theme,
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    ) -> Vec2D<u32>
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    where
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        LandT: Copy + Default + PartialEq,
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    {
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        let mut texture = Vec2D::new(&land.size().size(), 0);
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        if let Some(land_sprite) = theme.land_texture() {
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            for (row_index, (land_row, tex_row)) in land.rows().zip(texture.rows_mut()).enumerate()
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            {
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                let sprite_row = land_sprite.get_row(row_index % land_sprite.height());
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                let mut x_offset = 0;
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                while sprite_row.len() < land.width() - x_offset {
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                    let copy_range = x_offset..x_offset + sprite_row.len();
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                    tex_row_copy(
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                        parameters.basic(),
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                        &land_row[copy_range.clone()],
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                        &mut tex_row[copy_range],
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                        sprite_row,
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                    );
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                    x_offset += land_sprite.width()
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                }
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                if x_offset < land.width() {
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                    let final_range = x_offset..land.width();
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                    tex_row_copy(
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                        parameters.basic(),
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                        &land_row[final_range.clone()],
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                        &mut tex_row[final_range],
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                        &sprite_row[..land.width() - x_offset],
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                    );
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                }
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            }
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        }
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        if let Some(border_sprite) = theme.border_texture() {
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            assert!(border_sprite.height() <= 512);
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            let border_width = (border_sprite.height() / 2) as u8;
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            let border_sprite = border_sprite.to_tiled();
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            let mut offsets = vec![255u8; land.width()];
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            land_border_pass(
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                parameters.basic(),
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                land.rows().rev().zip(texture.rows_mut().rev()),
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                &mut offsets,
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                border_width,
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                |x, y| {
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                    border_sprite
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                        .get_pixel(x % border_sprite.width(), border_sprite.height() - 1 - y)
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                },
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            );
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            offsets.iter_mut().for_each(|v| *v = 255);
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            land_border_pass(
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                parameters.basic(),
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                land.rows().zip(texture.rows_mut()),
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                &mut offsets,
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                border_width,
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                |x, y| border_sprite.get_pixel(x % border_sprite.width(), y),
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            );
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        }
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        texture
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    }
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}
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impl MapGenerator<OutlineTemplate> {
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    pub fn import_yaml_templates(&mut self, text: &str) {
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        let mut desc: OutlineTemplateCollectionDesc = serde_yaml::from_str(text).unwrap();
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        let templates = std::mem::take(&mut desc.templates);
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        self.templates = desc
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            .template_types
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            .into_iter()
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            .map(|(size, indices)| {
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                (
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                    TemplateType(size),
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                    indices
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                        .indices
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                        .iter()
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                        .map(|i| Into::<OutlineTemplate>::into(&templates[*i]))
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                        .map(|o| {
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                            if indices.force_invert == Some(true) {
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                                o.cavern()
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                            } else {
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                                o
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                            }
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                        })
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                        .collect(),
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                )
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            })
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            .collect();
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    }
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    pub fn build_generator(&self, template: OutlineTemplate) -> impl LandGenerator {
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        TemplatedLandGenerator::new(template)
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    }
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}
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impl MapGenerator<WfcTemplate> {
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    pub fn import_yaml_templates(&mut self, text: &str) {
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        let mut desc: WfcTemplateCollectionDesc = serde_yaml::from_str(text).unwrap();
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        let templates = std::mem::take(&mut desc.templates);
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        self.templates = desc
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            .template_types
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            .into_iter()
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            .map(|(size, indices)| {
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                (
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                    TemplateType(size),
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                    indices.iter().map(|i| (&templates[*i]).into()).collect(),
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                )
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            })
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            .collect();
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    }
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    pub fn build_generator(&self, template: WfcTemplate) -> impl LandGenerator {
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        WavefrontCollapseLandGenerator::new(template, &self.data_path)
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    }
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}
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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struct Color(u32);
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impl Color {
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    #[inline]
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    fn red(self) -> u8 {
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        (self.0 & 0xFF) as u8
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    }
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    #[inline]
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    fn green(self) -> u8 {
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        (self.0 >> 8 & 0xFF) as u8
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    }
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    #[inline]
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    fn blue(self) -> u8 {
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        (self.0 >> 16 & 0xFF) as u8
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    }
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    #[inline]
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    fn alpha(self) -> u8 {
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        (self.0 >> 24 & 0xFF) as u8
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    }
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}
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#[inline]
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fn lerp(from: u8, to: u8, coef: u8) -> u8 {
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    ((from as u16 * (256 - coef as u16) + to as u16 * coef as u16) / 256) as u8
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}
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#[inline]
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fn blend(source: u32, target: u32) -> u32 {
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    let source = Color(source);
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    let target = Color(target);
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    let alpha = lerp(target.alpha(), 255, source.alpha());
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    let red = lerp(target.red(), source.red(), source.alpha());
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    let green = lerp(target.green(), source.green(), source.alpha());
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    let blue = lerp(target.blue(), source.blue(), source.alpha());
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    (red as u32) | (green as u32) << 8 | (blue as u32) << 16 | (alpha as u32) << 24
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}
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fn land_border_pass<'a, LandT, T, F>(
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    basic_value: LandT,
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    rows: T,
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    offsets: &mut [u8],
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    border_width: u8,
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    pixel_getter: F,
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) where
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    LandT: Default + PartialEq + 'a,
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    T: Iterator<Item = (&'a [LandT], &'a mut [u32])>,
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    F: (Fn(usize, usize) -> u32),
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{
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    for (land_row, tex_row) in rows {
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        for (x, ((land_v, tex_v), offset_v)) in land_row
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            .iter()
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            .zip(tex_row.iter_mut())
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            .zip(offsets.iter_mut())
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            .enumerate()
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        {
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            *offset_v = if *land_v == basic_value {
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                if *offset_v < border_width {
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                    *tex_v = blend(pixel_getter(x, *offset_v as usize), *tex_v)
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                }
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                offset_v.saturating_add(1)
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            } else {
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                0
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            }
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        }
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    }
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}
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fn tex_row_copy<LandT>(
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    basic_value: LandT,
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    land_row: &[LandT],
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    tex_row: &mut [u32],
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    sprite_row: &[u32],
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) where
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    LandT: Default + PartialEq,
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{
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    for ((land_v, tex_v), sprite_v) in land_row.iter().zip(tex_row.iter_mut()).zip(sprite_row) {
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        *tex_v = if *land_v == basic_value { *sprite_v } else { 0 }
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    }
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}
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#[cfg(test)]
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mod tests {
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    use crate::{MapGenerator, OutlineTemplate, TemplateType};
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    use rand::thread_rng;
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    #[test]
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    fn simple_load() {
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        let text = r#"
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# comment
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templates:
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  -
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    width: 3072
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    height: 1424
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    can_flip: false
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    can_invert: false
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    can_mirror: true
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    is_negative: false
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    put_girders: true
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    max_hedgehogs: 18
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    outline_points:
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      -
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        - {x: 748, y: 1424, w: 1, h: 1}
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        - {x: 636, y: 1252, w: 208, h: 72}
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        - {x: 898, y: 1110, w: 308, h: 60}
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        - {x: 1128, y: 1252, w: 434, h: 40}
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        - {x: 1574, y: 1112, w: 332, h: 40}
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        - {x: 1802, y: 1238, w: 226, h: 36}
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        - {x: 1930, y: 1424, w: 1, h: 1}
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    fill_points:
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      - {x: 1023, y: 0}
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      - {x: 1023, y: 0}
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template_types:
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    test: [0]
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"#;
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        let mut generator = MapGenerator::<OutlineTemplate>::new();
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        generator.import_yaml_templates(&text);
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        assert!(generator
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            .templates
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            .contains_key(&TemplateType("test".to_string())));
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        let template = generator.get_template("test", &mut thread_rng()).unwrap();
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        assert_eq!(template.islands[0].len(), 7);
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    }
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}