#![warn(missing_docs)]

//! This crate creates texture atlases from an asset tree.

use std::{collections::HashMap, path::PathBuf};

use serde::{Deserialize, Serialize};

/// The location of a single image in a sprite atlas
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct SpriteAtlasImage {
	/// The index of the atlas this image is in
	/// This is an index in SpriteAtlas.atlas_list
	pub atlas: u32,

	/// x-position of this image
	/// (between 0 and 1, using wgpu texture coordinates)
	pub x: f32,

	/// y-position of this image
	/// (between 0 and 1, using wgpu texture coordinates)
	pub y: f32,

	/// Width of this image
	/// (between 0 and 1, using wgpu texture coordinates)
	pub w: f32,

	/// Height of this image
	/// (between 0 and 1, using wgpu texture coordinates)
	pub h: f32,
}

/// A map between file paths (relative to the root asset dir)
/// and [`AtlasTexture`]s.
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct SpriteAtlas {
	/// The images in this atlas
	pub index: HashMap<PathBuf, SpriteAtlasImage>,

	/// The file names of the atlas textures we've generated
	pub atlas_list: Vec<String>,
}

impl SpriteAtlas {
	/// Make an empty [`SpriteAtlasIndex`]
	pub fn new() -> Self {
		Self {
			index: HashMap::new(),
			atlas_list: Vec::new(),
		}
	}
}