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Render Texture Extraction

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Silas Bartha 2024-04-24 21:05:55 -04:00
commit 98d21d244b
Signed by: soaos
GPG Key ID: 9BD3DCC0D56A09B2
10 changed files with 496 additions and 0 deletions
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# Add the contents of this file to `config.toml` to enable "fast build" configuration. Please read the notes below.
# NOTE: For maximum performance, build using a nightly compiler
# If you are using rust stable, remove the "-Zshare-generics=y" below.
[target.x86_64-unknown-linux-gnu]
linker = "clang"
rustflags = ["-Clink-arg=-fuse-ld=lld", "-Zshare-generics=y"]
# NOTE: you must install [Mach-O LLD Port](https://lld.llvm.org/MachO/index.html) on mac. you can easily do this by installing llvm which includes lld with the "brew" package manager:
# `brew install llvm`
[target.x86_64-apple-darwin]
rustflags = [
"-C",
"link-arg=-fuse-ld=/usr/local/opt/llvm/bin/ld64.lld",
"-Zshare-generics=y",
]
[target.aarch64-apple-darwin]
rustflags = [
"-C",
"link-arg=-fuse-ld=/opt/homebrew/opt/llvm/bin/ld64.lld",
"-Zshare-generics=y",
]
[target.x86_64-pc-windows-msvc]
linker = "rust-lld.exe"
rustflags = ["-Zshare-generics=n"]
# Optional: Uncommenting the following improves compile times, but reduces the amount of debug info to 'line number tables only'
# In most cases the gains are negligible, but if you are on macos and have slow compile times you should see significant gains.
#[profile.dev]
#debug = 1

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Cargo.toml Normal file
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[package]
name = "grex_framebuffer_extract"
version = "0.1.0"
edition = "2021"
[dependencies]
oneshot = "0.1.6"
pollster = "0.3.0"
[dependencies.bevy]
version = "0.13"
features = ["dynamic_linking"]

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Copyright (c) 2024 Silas Bartha
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use std::sync::{Mutex, Arc};
use bevy::{prelude::*, render::extract_component::ExtractComponent, ecs::query::QueryItem};
use crate::render_assets::FramebufferExtractSource;
#[derive(Component, Default, Clone)]
pub struct FramebufferExtractDestination(pub Arc<Mutex<Image>>);
impl ExtractComponent for FramebufferExtractDestination {
type QueryData = (
&'static Self,
&'static Handle<FramebufferExtractSource>,
);
type QueryFilter = ();
type Out = (Self, Handle<FramebufferExtractSource>);
fn extract_component((destination, source_handle): QueryItem<'_, Self::QueryData>) -> Option<Self::Out> {
Some((
destination.clone(),
source_handle.clone(),
))
}
}
#[derive(Bundle)]
pub struct ExtractFramebufferBundle {
pub source: Handle<FramebufferExtractSource>,
pub dest: FramebufferExtractDestination,
}

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use bevy::{prelude::*, render::{render_asset::RenderAssetPlugin, extract_component::ExtractComponentPlugin, RenderApp, Render, RenderSet, render_graph::RenderGraph, graph::CameraDriverLabel}};
use components::FramebufferExtractDestination;
use nodes::{FramebufferExtractNode, FramebufferExtractLabel};
use render_assets::FramebufferExtractSource;
pub mod components;
mod systems;
mod nodes;
pub mod render_assets;
pub enum FramebufferExtractSet {
Set
}
pub struct FramebufferExtractPlugin;
impl Plugin for FramebufferExtractPlugin {
fn build(&self, app: &mut App) {
app
.register_type::<FramebufferExtractSource>()
.init_asset::<FramebufferExtractSource>()
.register_asset_reflect::<FramebufferExtractSource>()
.add_plugins((
RenderAssetPlugin::<FramebufferExtractSource>::default(),
ExtractComponentPlugin::<FramebufferExtractDestination>::default(),
));
let render_app = app.sub_app_mut(RenderApp);
render_app
.add_systems(
Render,
systems::extract_framebuffers
.after(RenderSet::Render)
.before(RenderSet::Cleanup),
);
let mut graph = render_app.world.resource_mut::<RenderGraph>();
graph.add_node(FramebufferExtractLabel, FramebufferExtractNode);
graph.add_node_edge(CameraDriverLabel, FramebufferExtractLabel);
}
}

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use bevy::{prelude::*, render::{render_graph::{Node, RenderGraphContext, NodeRunError, RenderLabel}, renderer::RenderContext, render_asset::RenderAssets, render_resource::{ImageCopyBuffer, ImageDataLayout}}};
use crate::render_assets::FramebufferExtractSource;
#[derive(RenderLabel, Clone, PartialEq, Eq, Debug, Hash)]
pub struct FramebufferExtractLabel;
#[derive(Default)]
pub struct FramebufferExtractNode;
impl Node for FramebufferExtractNode {
fn run(
&self,
graph: &mut RenderGraphContext,
render_context: &mut RenderContext,
world: &World,
) -> Result<(), NodeRunError> {
for (_, source) in world.resource::<RenderAssets<FramebufferExtractSource>>().iter() {
let Some(gpu_image) = world.resource::<RenderAssets<Image>>().get(&source.source_handle) else {
return Ok(())
};
render_context.command_encoder().copy_texture_to_buffer(
gpu_image.texture.as_image_copy(),
ImageCopyBuffer {
buffer: &source.buffer,
layout: ImageDataLayout {
offset: 0,
bytes_per_row: Some(source.padded_bytes_per_row),
rows_per_image: None,
},
},
source.source_size,
);
}
Ok(())
}
}

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use bevy::{prelude::*, render::{render_asset::{RenderAsset, RenderAssets, RenderAssetUsages, PrepareAssetError}, render_resource::{Buffer, Extent3d, BufferUsages, BufferDescriptor, TextureFormat}, renderer::RenderDevice}, ecs::system::{lifetimeless::SRes, SystemParamItem}};
pub struct GpuFramebufferExtractSource {
pub buffer: Buffer,
pub source_handle: Handle<Image>,
pub source_size: Extent3d,
pub bytes_per_row: u32,
pub padded_bytes_per_row: u32,
pub format: TextureFormat,
}
#[derive(Asset, Reflect, Clone, Default)]
pub struct FramebufferExtractSource(pub Handle<Image>);
impl RenderAsset for FramebufferExtractSource {
type PreparedAsset = GpuFramebufferExtractSource;
type Param = (SRes<RenderDevice>, SRes<RenderAssets<Image>>);
fn asset_usage(&self) -> RenderAssetUsages {
RenderAssetUsages::default()
}
fn prepare_asset(
self,
(device, images): &mut SystemParamItem<Self::Param>,
) -> Result<Self::PreparedAsset, PrepareAssetError<Self>> {
let Some(gpu_image) = images.get(&self.0) else {
warn!("Failed to get GPU image");
return Err(PrepareAssetError::RetryNextUpdate(self))
};
let size = gpu_image.texture.size();
let format = gpu_image.texture_format;
let bytes_per_row = (size.width / format.block_dimensions().0) * format.block_copy_size(None).unwrap();
let padded_bytes_per_row = RenderDevice::align_copy_bytes_per_row(bytes_per_row as usize) as u32;
Ok(GpuFramebufferExtractSource {
buffer: device.create_buffer(&BufferDescriptor {
label: Some("framebuffer_extract_buffer"),
size: (size.height * padded_bytes_per_row) as u64,
usage: BufferUsages::COPY_DST | BufferUsages::MAP_READ,
mapped_at_creation: false,
}),
source_handle: self.0.clone(),
source_size: size,
bytes_per_row,
padded_bytes_per_row,
format,
})
}
}

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use std::time::Duration;
use bevy::{prelude::*, render::{render_asset::{RenderAssets, RenderAssetUsages}, renderer::RenderDevice, render_resource::{MapMode, Maintain, Extent3d, TextureDimension}}};
use pollster::FutureExt;
use crate::{render_assets::FramebufferExtractSource, components::FramebufferExtractDestination};
pub fn extract_framebuffers(
mut extract_bundles: Query<(&Handle<FramebufferExtractSource>, &mut FramebufferExtractDestination)>,
sources: Res<RenderAssets<FramebufferExtractSource>>,
device: Res<RenderDevice>,
) {
for (source_handle, destination_handle) in extract_bundles.iter_mut() {
let Some(gpu_source) = sources.get(source_handle) else {
continue;
};
let mut image_bytes = {
let slice = gpu_source.buffer.slice(..);
{
let (tx, rx) = oneshot::channel();
device.map_buffer(&slice, MapMode::Read, move |res| {
tx.send(res).unwrap();
});
device.poll(Maintain::Wait);
rx.block_on().unwrap().unwrap();
}
slice.get_mapped_range().to_vec()
};
gpu_source.buffer.unmap();
let bytes_per_row = gpu_source.bytes_per_row as usize;
let padded_bytes_per_row = gpu_source.padded_bytes_per_row as usize;
let source_size = gpu_source.source_size;
let destination_handle = destination_handle.clone();
let source_format = gpu_source.format;
std::thread::spawn(move || {
if bytes_per_row != padded_bytes_per_row {
let mut unpadded_bytes = Vec::<u8>::with_capacity(source_size.height as usize * bytes_per_row);
for padded_row in image_bytes.chunks(padded_bytes_per_row) {
unpadded_bytes.extend_from_slice(&padded_row[..bytes_per_row]);
}
image_bytes = unpadded_bytes;
}
*destination_handle.0.lock().unwrap() = Image::new(
Extent3d {
width: source_size.width,
height: source_size.height,
depth_or_array_layers: 1,
},
TextureDimension::D2,
image_bytes,
source_format,
RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD,
);
});
}
}