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Copy pathimage.rs
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612 lines (541 loc) · 19 KB
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//! An image in Processing is a 2D texture that can be used for rendering.
//!
//! It can be created from raw pixel data, loaded from disk, resized, and read back to CPU memory.
use std::path::PathBuf;
use bevy::{
asset::{
AssetPath, LoadState, RenderAssetUsages, handle_internal_asset_events,
io::{AssetSourceId, embedded::GetAssetServer},
},
ecs::system::RunSystemOnce,
image::{ImageAddressMode, ImageFilterMode, ImageSampler, ImageSamplerDescriptor},
prelude::*,
render::{
RenderApp,
render_asset::RenderAssets,
render_resource::{
Buffer, BufferDescriptor, BufferUsages, CommandEncoderDescriptor, Extent3d, MapMode,
Origin3d, PollType, TexelCopyBufferInfo, TexelCopyBufferLayout, TexelCopyTextureInfo,
Texture, TextureDimension, TextureFormat, TextureUsages,
},
renderer::{RenderDevice, RenderQueue},
texture::GpuImage,
},
};
use half::f16;
use processing_core::config::{Config, ConfigKey};
use processing_core::error::{ProcessingError, Result};
pub struct ImagePlugin;
impl Plugin for ImagePlugin {
fn build(&self, app: &mut App) {
if let Some(render_app) = app.get_sub_app_mut(RenderApp) {
render_app.init_resource::<BlitterCache>();
}
}
}
/// Where a blit reads its source pixels: another image, or a graphics render
/// target (via its render-world `ViewTarget`).
pub enum BlitSource {
Image(Handle<bevy::image::Image>),
Graphics(Entity),
}
/// Caches one `wgpu::util::TextureBlitter` per destination texture format. Lives
/// in the render world; blitters are cheap to reuse and expensive to rebuild.
#[derive(Resource, Default)]
pub struct BlitterCache {
blitters: std::collections::HashMap<TextureFormat, wgpu::util::TextureBlitter>,
}
/// Blit `source` into the destination image (a sampling copy: handles differing
/// size and format, unlike a raw `copy_texture_to_texture`). Runs in the render
/// world; the destination image's texture is used as the render target.
pub fn blit(
In((dst_handle, source)): In<(Handle<bevy::image::Image>, BlitSource)>,
render_device: Res<RenderDevice>,
render_queue: Res<RenderQueue>,
gpu_images: Res<RenderAssets<GpuImage>>,
view_targets: Query<(
&bevy::render::sync_world::MainEntity,
&bevy::render::view::ViewTarget,
)>,
mut cache: ResMut<BlitterCache>,
) -> Result<()> {
let dst = gpu_images
.get(&dst_handle)
.ok_or(ProcessingError::ImageNotFound)?;
let dst_view: &wgpu::TextureView = &dst.texture_view;
let format = dst.texture_descriptor.format;
let src_view: &wgpu::TextureView = match &source {
BlitSource::Image(handle) => {
&gpu_images
.get(handle)
.ok_or(ProcessingError::ImageNotFound)?
.texture_view
}
BlitSource::Graphics(entity) => view_targets
.iter()
.find(|(main, _)| ***main == *entity)
.map(|(_, vt)| vt.main_texture_view())
.ok_or(ProcessingError::GraphicsNotFound)?,
};
let device = render_device.wgpu_device();
let blitter = cache
.blitters
.entry(format)
.or_insert_with(|| wgpu::util::TextureBlitter::new(device, format));
let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
label: Some("processing_blit"),
});
blitter.copy(device, &mut encoder, src_view, dst_view);
render_queue.submit(std::iter::once(encoder.finish()));
Ok(())
}
#[derive(Component)]
#[relationship(relationship_target = LinkedImageTarget)]
pub struct LinkedImage(pub Entity);
#[derive(Component)]
#[relationship_target(relationship = LinkedImage)]
pub struct LinkedImageTarget(Entity);
#[derive(Component)]
pub struct Image {
pub handle: Handle<bevy::image::Image>,
readback_buffer: Buffer,
pub texture_format: TextureFormat,
pub size: Extent3d,
}
pub fn create(
In((size, data, texture_format)): In<(Extent3d, Vec<u8>, TextureFormat)>,
mut commands: Commands,
mut images: ResMut<Assets<bevy::image::Image>>,
render_device: Res<RenderDevice>,
) -> Entity {
let mut image = bevy::image::Image::new(
size,
TextureDimension::D2,
data,
texture_format,
RenderAssetUsages::all(),
);
// we need to mark this as a render attachment so it can be used as a render target for
// drawing and readback
image.texture_descriptor.usage |= TextureUsages::RENDER_ATTACHMENT;
let handle = images.add(image);
let readback_buffer = create_readback_buffer(
&render_device,
size.width,
size.height,
texture_format,
"Image Readback Buffer",
)
.expect("Failed to create readback buffer");
commands
.spawn((Image {
handle: handle.clone(),
readback_buffer,
texture_format,
size,
},))
.id()
}
pub fn load_start(world: &mut World, path: PathBuf) -> Handle<bevy::image::Image> {
world.get_asset_server().load(path)
}
pub fn is_loaded(world: &World, handle: &Handle<bevy::image::Image>) -> bool {
matches!(
world.get_asset_server().load_state(handle),
LoadState::Loaded
)
}
pub fn from_handle(
In(handle): In<Handle<bevy::image::Image>>,
world: &mut World,
) -> Result<Entity> {
let images = world.resource::<Assets<bevy::image::Image>>();
let image = images.get(&handle).ok_or(ProcessingError::ImageNotFound)?;
let size = image.texture_descriptor.size;
let texture_format = image.texture_descriptor.format;
let render_device = world.resource::<RenderDevice>();
let readback_buffer = create_readback_buffer(
render_device,
size.width,
size.height,
texture_format,
"Image Readback Buffer",
)?;
Ok(world
.spawn(Image {
handle: handle.clone(),
readback_buffer,
texture_format,
size,
})
.id())
}
pub fn load(In(path): In<PathBuf>, world: &mut World) -> Result<Entity> {
let config = world.resource_mut::<Config>();
let path: AssetPath = match config.get(ConfigKey::AssetRootPath) {
Some(_) => {
AssetPath::from_path_buf(path).with_source(AssetSourceId::from("assets_directory"))
}
None => AssetPath::from_path_buf(path),
};
let handle: Handle<bevy::image::Image> = world.get_asset_server().load(path);
while let LoadState::Loading = world.get_asset_server().load_state(&handle) {
world.run_system_once(handle_internal_asset_events).unwrap();
}
let images = world.resource::<Assets<bevy::image::Image>>();
let image = images.get(&handle).ok_or(ProcessingError::ImageNotFound)?;
let size = image.texture_descriptor.size;
let texture_format = image.texture_descriptor.format;
let render_device = world.resource::<RenderDevice>();
let readback_buffer = create_readback_buffer(
render_device,
size.width,
size.height,
texture_format,
"Image Readback Buffer",
)?;
Ok(world
.spawn(Image {
handle: handle.clone(),
readback_buffer,
texture_format,
size,
})
.id())
}
pub fn resize(
In((entity, new_size)): In<(Entity, Extent3d)>,
mut p_images: Query<&mut Image>,
mut images: ResMut<Assets<bevy::image::Image>>,
render_device: Res<RenderDevice>,
) -> Result<()> {
let mut p_image = p_images
.get_mut(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
images
.get_mut(&p_image.handle)
.ok_or(ProcessingError::ImageNotFound)?
.resize_in_place(new_size);
p_image.readback_buffer = create_readback_buffer(
&render_device,
new_size.width,
new_size.height,
p_image.texture_format,
"Image Readback Buffer",
)?;
p_image.size = new_size;
Ok(())
}
pub fn readback(
In((entity, texture)): In<(Entity, Texture)>,
p_images: Query<&Image>,
mut images: ResMut<Assets<bevy::image::Image>>,
render_device: Res<RenderDevice>,
render_queue: ResMut<RenderQueue>,
) -> Result<Vec<LinearRgba>> {
let p_image = p_images
.get(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
let mut encoder = render_device.create_command_encoder(&CommandEncoderDescriptor::default());
let px_size = pixel_size(p_image.texture_format)?;
let padded_bytes_per_row =
RenderDevice::align_copy_bytes_per_row(p_image.size.width as usize * px_size);
encoder.copy_texture_to_buffer(
texture.as_image_copy(),
TexelCopyBufferInfo {
buffer: &p_image.readback_buffer,
layout: TexelCopyBufferLayout {
offset: 0,
bytes_per_row: Some(
std::num::NonZero::<u32>::new(padded_bytes_per_row as u32)
.unwrap()
.into(),
),
rows_per_image: None,
},
},
p_image.size,
);
render_queue.submit(std::iter::once(encoder.finish()));
let buffer_slice = p_image.readback_buffer.slice(..);
let (s, r) = crossbeam_channel::bounded(1);
buffer_slice.map_async(MapMode::Read, move |r| match r {
Ok(r) => s.send(r).expect("Failed to send map update"),
Err(err) => panic!("Failed to map buffer {err}"),
});
render_device
.poll(PollType::wait_indefinitely())
.expect("Failed to poll device for map async");
r.recv().expect("Failed to receive the map_async message");
let data = buffer_slice
.get_mapped_range()
.expect("Failed to get mapped range for readback")
.to_vec();
let mut image = images
.get_mut(&p_image.handle)
.ok_or(ProcessingError::ImageNotFound)?;
image.data = Some(data.clone());
p_image.readback_buffer.unmap();
bytes_to_pixels(
&data,
p_image.texture_format,
p_image.size.width,
p_image.size.height,
padded_bytes_per_row,
)
}
pub fn update_region_write(
In((entity, texture, x, y, width, height, data, px_size)): In<(
Entity,
Texture,
u32,
u32,
u32,
u32,
Vec<u8>,
u32,
)>,
p_images: Query<&Image>,
render_queue: Res<RenderQueue>,
) -> Result<()> {
let p_image = p_images
.get(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
if x + width > p_image.size.width || y + height > p_image.size.height {
return Err(ProcessingError::InvalidArgument(format!(
"Region ({}, {}, {}, {}) exceeds image bounds ({}, {})",
x, y, width, height, p_image.size.width, p_image.size.height
)));
}
let bytes_per_row = width * px_size;
render_queue.write_texture(
TexelCopyTextureInfo {
texture: &texture,
mip_level: 0,
origin: Origin3d { x, y, z: 0 },
aspect: Default::default(),
},
&data,
TexelCopyBufferLayout {
offset: 0,
bytes_per_row: Some(bytes_per_row),
rows_per_image: None,
},
Extent3d {
width,
height,
depth_or_array_layers: 1,
},
);
Ok(())
}
pub fn prepare_update_region(
world: &World,
entity: Entity,
width: u32,
height: u32,
pixels: &[LinearRgba],
) -> Result<(Vec<u8>, u32)> {
let expected_count = (width * height) as usize;
if pixels.len() != expected_count {
return Err(ProcessingError::InvalidArgument(format!(
"Expected {} pixels for {}x{} region, got {}",
expected_count,
width,
height,
pixels.len()
)));
}
let p_image = world
.get::<Image>(entity)
.ok_or(ProcessingError::ImageNotFound)?;
let px_size = pixel_size(p_image.texture_format)? as u32;
let data = pixels_to_bytes(pixels, p_image.texture_format)?;
Ok((data, px_size))
}
/// Get the pixel dimensions `(width, height)` of an image.
pub fn dimensions(In(entity): In<Entity>, p_images: Query<&Image>) -> Result<(u32, u32)> {
let p_image = p_images
.get(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
Ok((p_image.size.width, p_image.size.height))
}
pub fn destroy(
In(entity): In<Entity>,
mut commands: Commands,
p_images: Query<&Image>,
) -> Result<()> {
p_images
.get(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
commands.entity(entity).despawn();
Ok(())
}
/// Get the size in bytes of a single pixel for the given texture format.
pub fn pixel_size(format: TextureFormat) -> Result<usize> {
match format {
TextureFormat::Rgba8Unorm | TextureFormat::Rgba8UnormSrgb => Ok(4),
TextureFormat::Rgba16Float => Ok(8),
TextureFormat::Rgba32Float => Ok(16),
_ => Err(ProcessingError::UnsupportedTextureFormat),
}
}
/// Convert LinearRgba pixels to raw bytes in the specified texture format.
pub fn pixels_to_bytes(pixels: &[LinearRgba], format: TextureFormat) -> Result<Vec<u8>> {
match format {
TextureFormat::Rgba8Unorm | TextureFormat::Rgba8UnormSrgb => {
Ok(pixels.iter().flat_map(|p| p.to_u8_array()).collect())
}
TextureFormat::Rgba16Float => Ok(pixels
.iter()
.flat_map(|p| {
let [r, g, b, a] = p.to_f32_array();
[
f16::from_f32(r).to_bits().to_le_bytes(),
f16::from_f32(g).to_bits().to_le_bytes(),
f16::from_f32(b).to_bits().to_le_bytes(),
f16::from_f32(a).to_bits().to_le_bytes(),
]
.into_iter()
.flatten()
})
.collect()),
TextureFormat::Rgba32Float => Ok(pixels
.iter()
.flat_map(|p| {
let [r, g, b, a] = p.to_f32_array();
[
r.to_le_bytes(),
g.to_le_bytes(),
b.to_le_bytes(),
a.to_le_bytes(),
]
.into_iter()
.flatten()
})
.collect()),
_ => Err(ProcessingError::UnsupportedTextureFormat),
}
}
/// Convert raw bytes to LinearRgba pixels based on the texture format.
/// Handles row padding, data should come from a GPU texture readback with proper alignment.
pub fn bytes_to_pixels(
data: &[u8],
format: TextureFormat,
width: u32,
height: u32,
padded_bytes_per_row: usize,
) -> Result<Vec<LinearRgba>> {
let px_size = pixel_size(format)?;
let bytes_per_row = width as usize * px_size;
let pixels = match format {
TextureFormat::Rgba8Unorm | TextureFormat::Rgba8UnormSrgb => data
.chunks_exact(padded_bytes_per_row)
.take(height as usize)
.flat_map(|row| {
row[..bytes_per_row].chunks_exact(px_size).map(|chunk| {
LinearRgba::from_u8_array([chunk[0], chunk[1], chunk[2], chunk[3]])
})
})
.collect(),
TextureFormat::Rgba16Float => data
.chunks_exact(padded_bytes_per_row)
.take(height as usize)
.flat_map(|row| {
row[..bytes_per_row].chunks_exact(px_size).map(|chunk| {
let r = f16::from_bits(u16::from_le_bytes([chunk[0], chunk[1]])).to_f32();
let g = f16::from_bits(u16::from_le_bytes([chunk[2], chunk[3]])).to_f32();
let b = f16::from_bits(u16::from_le_bytes([chunk[4], chunk[5]])).to_f32();
let a = f16::from_bits(u16::from_le_bytes([chunk[6], chunk[7]])).to_f32();
LinearRgba::from_f32_array([r, g, b, a])
})
})
.collect(),
TextureFormat::Rgba32Float => data
.chunks_exact(padded_bytes_per_row)
.take(height as usize)
.flat_map(|row| {
row[..bytes_per_row].chunks_exact(px_size).map(|chunk| {
let r = f32::from_le_bytes([chunk[0], chunk[1], chunk[2], chunk[3]]);
let g = f32::from_le_bytes([chunk[4], chunk[5], chunk[6], chunk[7]]);
let b = f32::from_le_bytes([chunk[8], chunk[9], chunk[10], chunk[11]]);
let a = f32::from_le_bytes([chunk[12], chunk[13], chunk[14], chunk[15]]);
LinearRgba::from_f32_array([r, g, b, a])
})
})
.collect(),
// TODO: Handle more formats as needed
_ => return Err(ProcessingError::UnsupportedTextureFormat),
};
Ok(pixels)
}
/// Create a readback buffer for the given texture dimensions and format.
pub fn create_readback_buffer(
render_device: &RenderDevice,
width: u32,
height: u32,
format: TextureFormat,
label: &str,
) -> Result<Buffer> {
let px_size = pixel_size(format)?;
let padded_bytes_per_row = RenderDevice::align_copy_bytes_per_row(width as usize * px_size);
let buffer_size = padded_bytes_per_row as u64 * height as u64;
Ok(render_device.create_buffer(&BufferDescriptor {
label: Some(label),
size: buffer_size,
usage: BufferUsages::COPY_DST | BufferUsages::MAP_READ,
mapped_at_creation: false,
}))
}
pub fn set_sampler(
In((entity, filter, wrap_x, wrap_y)): In<(Entity, u8, u8, u8)>,
p_images: Query<&Image>,
mut images: ResMut<Assets<bevy::image::Image>>,
) -> Result<()> {
let p_image = p_images
.get(entity)
.map_err(|_| ProcessingError::ImageNotFound)?;
let mut image = images
.get_mut(&p_image.handle)
.ok_or(ProcessingError::ImageNotFound)?;
let filter_mode = match filter {
0 => ImageFilterMode::Linear,
1 => ImageFilterMode::Nearest,
_ => {
return Err(ProcessingError::InvalidArgument(format!(
"unknown filter mode: {filter}"
)));
}
};
let addr_mode = |v: u8| match v {
0 => Ok(ImageAddressMode::ClampToEdge),
1 => Ok(ImageAddressMode::Repeat),
2 => Ok(ImageAddressMode::MirrorRepeat),
_ => Err(ProcessingError::InvalidArgument(format!(
"unknown wrap mode: {v}"
))),
};
image.sampler = ImageSampler::Descriptor(ImageSamplerDescriptor {
mag_filter: filter_mode,
min_filter: filter_mode,
mipmap_filter: filter_mode,
address_mode_u: addr_mode(wrap_x)?,
address_mode_v: addr_mode(wrap_y)?,
..Default::default()
});
Ok(())
}
pub fn gpu_image(app: &mut App, entity: Entity) -> Result<&GpuImage> {
let handle = app
.world()
.get::<Image>(entity)
.ok_or(ProcessingError::ImageNotFound)?
.handle
.clone();
let render_world = app.sub_app(RenderApp).world();
let gpu_images = render_world.resource::<RenderAssets<GpuImage>>();
let gpu_image = gpu_images
.get(&handle)
.ok_or(ProcessingError::ImageNotFound)?;
Ok(gpu_image)
}