97 lines
3.4 KiB
Rust
97 lines
3.4 KiB
Rust
use crate::{Rect, TextureAtlas};
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use bevy_asset::{Assets, Handle};
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use bevy_render::texture::Texture;
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use glam::Vec2;
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use guillotiere::{size2, AllocId, Allocation, AtlasAllocator};
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use std::collections::HashMap;
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pub struct DynamicTextureAtlasBuilder {
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pub allocation_textures: HashMap<AllocId, Handle<Texture>>,
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pub atlas_allocator: AtlasAllocator,
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}
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const FORMAT_SIZE: usize = 4; // TODO: get this from an actual format type
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impl DynamicTextureAtlasBuilder {
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pub fn new(size: Vec2) -> Self {
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Self {
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allocation_textures: Default::default(),
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atlas_allocator: AtlasAllocator::new(to_size2(size)),
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}
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}
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pub fn add_texture(
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&mut self,
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texture_atlas: &mut TextureAtlas,
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textures: &mut Assets<Texture>,
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texture: &Texture,
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) -> Option<u32> {
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let allocation = self
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.atlas_allocator
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.allocate(size2(texture.size.x() as i32, texture.size.y() as i32));
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if let Some(allocation) = allocation {
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let atlas_texture = textures.get_mut(&texture_atlas.texture).unwrap();
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self.place_texture(atlas_texture, allocation, texture);
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texture_atlas.add_texture(allocation.rectangle.into());
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Some((texture_atlas.len() - 1) as u32)
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} else {
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None
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}
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}
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// fn resize(
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// &mut self,
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// texture_atlas: &mut TextureAtlas,
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// textures: &mut Assets<Texture>,
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// size: Vec2,
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// ) {
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// let new_size2 = to_size2(new_size);
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// self.atlas_texture = Texture::new_fill(new_size, &[0,0,0,0]);
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// let change_list = self.atlas_allocator.resize_and_rearrange(new_size2);
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// for change in change_list.changes {
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// if let Some(changed_texture_handle) = self.allocation_textures.remove(&change.old.id) {
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// let changed_texture = textures.get(&changed_texture_handle).unwrap();
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// self.place_texture(change.new, changed_texture_handle, changed_texture);
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// }
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// }
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// for failure in change_list.failures {
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// let failed_texture = self.allocation_textures.remove(&failure.id).unwrap();
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// queued_textures.push(failed_texture);
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// }
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// }
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fn place_texture(
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&mut self,
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atlas_texture: &mut Texture,
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allocation: Allocation,
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texture: &Texture,
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) {
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let rect = allocation.rectangle;
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let atlas_width = atlas_texture.size.x() as usize;
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let rect_width = rect.width() as usize;
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for (texture_y, bound_y) in (rect.min.y..rect.max.y).map(|i| i as usize).enumerate() {
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let begin = (bound_y * atlas_width + rect.min.x as usize) * FORMAT_SIZE;
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let end = begin + rect_width * FORMAT_SIZE;
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let texture_begin = texture_y * rect_width * FORMAT_SIZE;
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let texture_end = texture_begin + rect_width * FORMAT_SIZE;
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atlas_texture.data[begin..end]
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.copy_from_slice(&texture.data[texture_begin..texture_end]);
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}
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}
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}
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impl From<guillotiere::Rectangle> for Rect {
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fn from(rectangle: guillotiere::Rectangle) -> Self {
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Rect {
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min: Vec2::new(rectangle.min.x as f32, rectangle.min.y as f32),
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max: Vec2::new(rectangle.max.x as f32, rectangle.max.y as f32),
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}
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}
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}
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fn to_size2(vec2: Vec2) -> guillotiere::Size {
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guillotiere::Size::new(vec2.x() as i32, vec2.y() as i32)
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}
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