rust/lib-hedgewars-engine/src/render/gear.rs
author alfadur
Sat, 22 Jun 2019 00:18:24 +0300
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child 15307 16bd389fc735
permissions -rw-r--r--
fill the atlas with sprites
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use super::atlas::AtlasCollection;
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use crate::render::camera::Camera;
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use integral_geometry::Size;
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use png::{ColorType, Decoder, DecodingError};
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use std::{
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    fs::{read_dir, File},
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    io,
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    io::BufReader,
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    path::Path,
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};
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pub struct GearRenderer {
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    atlas: AtlasCollection,
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}
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const ATLAS_SIZE: Size = Size::square(1024);
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impl GearRenderer {
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    pub fn new() -> Self {
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        let mut atlas = AtlasCollection::new(ATLAS_SIZE);
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        let sprites = load_sprites(Path::new("../../share/hedgewars/Data/Graphics/"))
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            .expect("Unable to load Graphics");
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        for sprite in &sprites {
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            atlas.insert_sprite(*sprite);
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        }
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        println!(
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            "Filled atlas with {} sprites:\n{}",
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            sprites.len(),
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            atlas.used_space()
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        );
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        Self { atlas }
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    }
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    pub fn render(&mut self, camera: &Camera) {
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        let projection = camera.projection();
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    }
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}
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fn load_sprite(path: &Path) -> io::Result<Size> {
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    let decoder = Decoder::new(BufReader::new(File::open(path)?));
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    let (info, mut reader) = decoder.read_info()?;
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    let size = Size::new(info.width as usize, info.height as usize);
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    Ok(size)
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}
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fn load_sprites(path: &Path) -> io::Result<Vec<Size>> {
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    let mut result = vec![];
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    for file in read_dir(path)? {
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        let file = file?;
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        if let Some(extension) = file.path().extension() {
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            if extension == "png" {
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                let sprite = load_sprite(&file.path())?;
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                result.push(sprite);
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            }
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        }
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    }
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    Ok(result)
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}