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use super::{super::media::MediaMgr, AtlasSlice, CUBE};
use mt_net::NodeDef;
use std::collections::HashMap;
pub(super) fn create_atlas(
nodes: &mut HashMap<u16, NodeDef>,
media: &MediaMgr,
) -> (image::RgbaImage, Vec<AtlasSlice>) {
let mut allocator = guillotiere::SimpleAtlasAllocator::new(guillotiere::size2(1, 1));
let mut textures = Vec::new();
let mut id_map = HashMap::new();
for node in nodes.values_mut() {
let tiles = std::iter::empty()
.chain(node.tiles.iter_mut())
.chain(node.overlay_tiles.iter_mut())
.chain(node.special_tiles.iter_mut());
for tile in tiles {
tile.texture.custom = *id_map.entry(tile.texture.name.clone()).or_insert_with(|| {
let img = media.texture_string(&tile.texture.name);
let dimensions = img.dimensions();
let size = guillotiere::size2(dimensions.0 as i32, dimensions.1 as i32);
loop {
match allocator.allocate(size) {
None => {
let mut atlas_size = allocator.size();
atlas_size.width *= 2;
atlas_size.height *= 2;
allocator.grow(atlas_size);
}
Some(rect) => {
let id = textures.len();
textures.push((img, rect));
return id;
}
}
}
})
}
}
let size = allocator.size();
let mut atlas = image::RgbaImage::new(size.width as u32, size.height as u32);
let slices = textures
.into_iter()
.map(|(img, rect)| {
let w = size.width as f32;
let h = size.height as f32;
let x = (rect.min.x as f32 / w)..(rect.max.x as f32 / w);
let y = (rect.min.y as f32 / h)..(rect.max.y as f32 / h);
use image::GenericImage;
atlas
.copy_from(&img, rect.min.x as u32, rect.min.y as u32)
.unwrap();
use lerp::Lerp;
use std::array::from_fn as array;
let rect = [x, y];
let cube_tex_coords =
array(|f| array(|v| array(|i| rect[i].start.lerp(rect[i].end, CUBE[f][v].1[i]))));
AtlasSlice { cube_tex_coords }
})
.collect();
(atlas, slices)
}
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