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|
use iced_native::image;
use std::{
collections::{HashMap, HashSet},
rc::Rc,
};
#[derive(Debug)]
pub enum Memory {
Host(::image::ImageBuffer<::image::Bgra<u8>, Vec<u8>>),
Device {
bind_group: Rc<wgpu::BindGroup>,
width: u32,
height: u32,
},
NotFound,
Invalid,
}
impl Memory {
pub fn dimensions(&self) -> (u32, u32) {
match self {
Memory::Host(image) => image.dimensions(),
Memory::Device { width, height, .. } => (*width, *height),
Memory::NotFound => (1, 1),
Memory::Invalid => (1, 1),
}
}
pub fn upload(
&mut self,
device: &wgpu::Device,
encoder: &mut wgpu::CommandEncoder,
texture_layout: &wgpu::BindGroupLayout,
) -> Option<Rc<wgpu::BindGroup>> {
match self {
Memory::Host(image) => {
let (width, height) = image.dimensions();
let extent = wgpu::Extent3d {
width,
height,
depth: 1,
};
let texture = device.create_texture(&wgpu::TextureDescriptor {
size: extent,
array_layer_count: 1,
mip_level_count: 1,
sample_count: 1,
dimension: wgpu::TextureDimension::D2,
format: wgpu::TextureFormat::Bgra8UnormSrgb,
usage: wgpu::TextureUsage::COPY_DST
| wgpu::TextureUsage::SAMPLED,
});
let temp_buf = {
let flat_samples = image.as_flat_samples();
let slice = flat_samples.as_slice();
device
.create_buffer_mapped(
slice.len(),
wgpu::BufferUsage::COPY_SRC,
)
.fill_from_slice(slice)
};
encoder.copy_buffer_to_texture(
wgpu::BufferCopyView {
buffer: &temp_buf,
offset: 0,
row_pitch: 4 * width as u32,
image_height: height as u32,
},
wgpu::TextureCopyView {
texture: &texture,
array_layer: 0,
mip_level: 0,
origin: wgpu::Origin3d {
x: 0.0,
y: 0.0,
z: 0.0,
},
},
extent,
);
let bind_group =
device.create_bind_group(&wgpu::BindGroupDescriptor {
layout: texture_layout,
bindings: &[wgpu::Binding {
binding: 0,
resource: wgpu::BindingResource::TextureView(
&texture.create_default_view(),
),
}],
});
let bind_group = Rc::new(bind_group);
*self = Memory::Device {
bind_group: bind_group.clone(),
width,
height,
};
Some(bind_group)
}
Memory::Device { bind_group, .. } => Some(bind_group.clone()),
Memory::NotFound => None,
Memory::Invalid => None,
}
}
}
#[derive(Debug)]
pub struct Cache {
map: HashMap<u64, Memory>,
hits: HashSet<u64>,
}
impl Cache {
pub fn new() -> Self {
Self {
map: HashMap::new(),
hits: HashSet::new(),
}
}
pub fn load(&mut self, handle: &image::Handle) -> &mut Memory {
if self.contains(handle) {
return self.get(handle).unwrap();
}
let memory = match handle.data() {
image::Data::Path(path) => {
if let Ok(image) = ::image::open(path) {
Memory::Host(image.to_bgra())
} else {
Memory::NotFound
}
}
image::Data::Bytes(bytes) => {
if let Ok(image) = ::image::load_from_memory(&bytes) {
Memory::Host(image.to_bgra())
} else {
Memory::Invalid
}
}
};
self.insert(handle, memory);
self.get(handle).unwrap()
}
pub fn trim(&mut self) {
let hits = &self.hits;
self.map.retain(|k, _| hits.contains(k));
self.hits.clear();
}
fn get(&mut self, handle: &image::Handle) -> Option<&mut Memory> {
let _ = self.hits.insert(handle.id());
self.map.get_mut(&handle.id())
}
fn insert(&mut self, handle: &image::Handle, memory: Memory) {
let _ = self.map.insert(handle.id(), memory);
}
fn contains(&self, handle: &image::Handle) -> bool {
self.map.contains_key(&handle.id())
}
}
|
