maplibre-rs/maplibre/build.rs

//! # Build
//!
//! This script is built and executed just before building the package.
//! It will validate the WGSL (WebGPU Shading Language) shaders and embed static files.

use maplibre_build_tools::wgsl::validate_project_wgsl;

#[cfg(feature = "embed-static-tiles")]
fn embed_tiles_statically() {
    use std::{env, path::Path};

    use maplibre_build_tools::mbtiles::extract;

    const MUNICH_X: u32 = 17425;
    const MUNICH_Y: u32 = 11365;
    const MUNICH_Z: u8 = 15;

    /// Tiles which can be used by StaticTileFetcher.
    fn clean_static_tiles() -> std::path::PathBuf {
        let out_dir = env::var("OUT_DIR").unwrap();

        let out = Path::new(&out_dir).join("extracted-tiles");

        if out.exists() && out.is_dir() {
            std::fs::remove_dir_all(&out).unwrap()
        }

        out
    }

    let out = clean_static_tiles();

    let root_dir = env::var("CARGO_MANIFEST_DIR").unwrap();

    let source = Path::new(&root_dir).join(format!("../test-data/munich-{}.mbtiles", MUNICH_Z));

    if source.exists() {
        println!("cargo:rustc-cfg=static_tiles_found");
        // Pack tiles around Munich HBF (100 tiles in each direction)
        extract(
            source,
            out,
            MUNICH_Z,
            (MUNICH_X - 2)..(MUNICH_X + 2),
            (MUNICH_Y - 2)..(MUNICH_Y + 2),
        )
        .unwrap();
    } else {
        // Do not statically embed tiles
    }
}

fn main() {
    validate_project_wgsl();

    #[cfg(feature = "embed-static-tiles")]
    embed_tiles_statically();
}