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Silas Bartha 2024-04-24 14:03:15 -04:00
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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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/target

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[package]
name = "grex_dither_post_process"
version = "0.1.0"
edition = "2021"
[dependencies.bevy]
version = "0.13"
features = ["dynamic_linking"]

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Copyright (c) 2024 Silas Bartha
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# grex_dither_post_process
A plugin for the [Bevy](https://bevyengine.org) engine which adds a dither post-processing effect.
The effect is implemented as a bilevel ordered dither using a Bayer matrix with a configurable level. It dithers the image to black and white only, and operates on the entire screen.
## Screenshots
![](./doc/screenshot.png)
![](./doc/screenshot_plant.png)
Configuration Used:
```rs
grex_dither_post_process::components::DitherPostProcessSettings::new(3, images);
```
## Compatibility
| Crate Version | Bevy Version |
|--- |--- |
| 0.1 | 0.13 |
## Installation
### Using git URL in Cargo.toml
```toml
[dependencies.grex_dither_post_process]
git = "https://github.com/exvacuum/grex_dither_post_process.git"
```
## Usage
In `main.rs`:
```rs
use bevy::prelude::*;
use grex_dither_post_process;
fn main() {
App::new()
.add_plugins((
DefaultPlugins,
grex_dither_post_process::DitherPostProcessPlugin,
))
.run();
}
```
When spawning a camera:
```rs
commands.spawn((
// Camera3dBundle...
grex_dither_post_process::components::DitherPostProcessSettings::new(level, images);
));
```
This effect will only run for cameras which contain this component.

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#import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput;
@group(0) @binding(0) var screen_texture: texture_2d<f32>;
@group(0) @binding(1) var screen_sampler: sampler;
@group(0) @binding(2) var threshold_map_texture: texture_2d<f32>;
@group(0) @binding(3) var threshold_map_sampler: sampler;
@fragment
fn fragment(
in: FullscreenVertexOutput
) -> @location(0) vec4<f32> {
let screen_size = vec2f(textureDimensions(screen_texture));
let threshold_map_size = vec2f(textureDimensions(threshold_map_texture));
let pixel_position = floor(in.uv * screen_size);
let map_position = (pixel_position % threshold_map_size) / threshold_map_size;
let threshold = textureSample(threshold_map_texture, threshold_map_sampler, map_position).r;
let base_color = textureSample(screen_texture, screen_sampler, in.uv);
let luma = (0.2126 * base_color.r + 0.7152 * base_color.g + 0.0722 * base_color.b);
let value = f32(luma > threshold);
return vec4f(value, value, value, 1.0);
}

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use bevy::{
prelude::*,
render::{
render_asset::RenderAssetUsages,
render_resource::{Extent3d, TextureDimension, TextureFormat, TextureUsages}, extract_component::ExtractComponent,
},
};
#[derive(Component, ExtractComponent, Clone)]
pub struct DitherPostProcessSettings(Handle<Image>);
impl DitherPostProcessSettings {
pub fn new(level: u32, mut images: ResMut<Assets<Image>>) -> Self {
let power = level + 1;
let map_size: u32 = 1 << power;
let mut buffer = Vec::<u8>::new();
for row in 0..map_size {
for col in 0..map_size {
let a = row ^ col;
// Interleave bits of `a` with bits of y coordinate in reverse order
let mut result: u64 = 0;
let mut bit = 0;
let mut mask = power as i32 - 1;
loop {
if bit >= 2 * power {
break;
}
result |= (((col >> mask) & 1) << bit) as u64;
bit += 1;
result |= (((a >> mask) & 1) << bit) as u64;
bit += 1;
mask -= 1;
}
let value = ((result as f32 / map_size.pow(2) as f32) * 255.0) as u8;
buffer.push(value);
}
}
let mut image = Image::new(
Extent3d {
width: map_size,
height: map_size,
depth_or_array_layers: 1,
},
TextureDimension::D2,
buffer,
TextureFormat::R8Unorm,
RenderAssetUsages::RENDER_WORLD,
);
image.texture_descriptor.usage =
TextureUsages::COPY_DST | TextureUsages::STORAGE_BINDING | TextureUsages::TEXTURE_BINDING;
let handle = images.add(image);
Self(handle)
}
pub fn handle(&self) -> Handle<Image> {
self.0.clone()
}
}

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use bevy::{prelude::*, render::{RenderApp, render_graph::{RenderGraphApp, ViewNodeRunner}, extract_component::ExtractComponentPlugin}, asset::embedded_asset, core_pipeline::core_3d::graph::{Core3d, Node3d}};
use crate::components::DitherPostProcessSettings;
pub struct DitherPostProcessPlugin;
pub mod components;
mod resources;
mod nodes;
impl Plugin for DitherPostProcessPlugin {
fn build(&self, app: &mut App) {
embedded_asset!(app, "../assets/shaders/dither_post_process.wgsl");
app.add_plugins((
ExtractComponentPlugin::<DitherPostProcessSettings>::default(),
));
let Ok(render_app) = app.get_sub_app_mut(RenderApp) else {
return;
};
render_app.add_render_graph_node::<ViewNodeRunner<nodes::DitherRenderNode>>(
Core3d,
nodes::DitherRenderLabel,
).add_render_graph_edges(
Core3d,
(
Node3d::Tonemapping,
nodes::DitherRenderLabel,
Node3d::EndMainPassPostProcessing,
),
);
}
fn finish(&self, app: &mut App) {
let Ok(render_app) = app.get_sub_app_mut(RenderApp) else {
return;
};
render_app.init_resource::<resources::DitherPostProcessPipeline>();
}
}

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use bevy::{prelude::*, render::{render_graph::{ViewNode, NodeRunError, RenderGraphContext, RenderLabel}, view::ViewTarget, renderer::RenderContext, render_resource::{PipelineCache, BindGroupEntries, RenderPassDescriptor, RenderPassColorAttachment, Operations}, render_asset::RenderAssets}, ecs::query::QueryItem};
use super::components;
use super::resources;
#[derive(RenderLabel, Clone, Eq, PartialEq, Hash, Debug)]
pub struct DitherRenderLabel;
#[derive(Default)]
pub struct DitherRenderNode;
impl ViewNode for DitherRenderNode {
type ViewQuery = (
&'static ViewTarget,
&'static components::DitherPostProcessSettings,
);
fn run(
&self,
_graph: &mut RenderGraphContext,
render_context: &mut RenderContext,
(view_target, dither_post_process_settings): QueryItem<Self::ViewQuery>,
world: &World,
) -> Result<(), NodeRunError> {
let render_pipeline = world.resource::<resources::DitherPostProcessPipeline>();
let pipeline_cache = world.resource::<PipelineCache>();
let Some(pipeline) = pipeline_cache.get_render_pipeline(render_pipeline.pipeline_id) else {
warn!("Failed to get render pipeline from cache, skipping...");
return Ok(());
};
let post_process = view_target.post_process_write();
let Some(threshold_map) = world.resource::<RenderAssets<Image>>().get(dither_post_process_settings.handle()) else {
warn!("Failed to get threshold map, skipping...");
return Ok(());
};
let bind_group = render_context.render_device().create_bind_group(
"dither_post_process_bind_group",
&render_pipeline.layout,
&BindGroupEntries::sequential((
post_process.source,
&render_pipeline.screen_sampler,
&threshold_map.texture_view,
&render_pipeline.threshold_map_sampler,
)),
);
let mut render_pass = render_context.begin_tracked_render_pass(RenderPassDescriptor {
label: Some("dither_post_process_render_pass"),
color_attachments: &[Some(RenderPassColorAttachment {
view: post_process.destination,
ops: Operations::default(),
resolve_target: None,
})],
timestamp_writes: None,
depth_stencil_attachment: None,
occlusion_query_set: None,
});
render_pass.set_render_pipeline(pipeline);
render_pass.set_bind_group(0, &bind_group, &[]);
render_pass.draw(0..3, 0..1);
Ok(())
}
}

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use bevy::{
core_pipeline::fullscreen_vertex_shader::fullscreen_shader_vertex_state,
prelude::*,
render::{
render_resource::{
binding_types::{sampler, texture_2d},
BindGroupLayout, BindGroupLayoutEntries, CachedRenderPipelineId, ColorTargetState,
ColorWrites, FragmentState, MultisampleState, PipelineCache, PrimitiveState,
RenderPipelineDescriptor, Sampler, SamplerBindingType, SamplerDescriptor, ShaderStages,
TextureFormat, TextureSampleType,
},
renderer::RenderDevice,
texture::BevyDefault,
},
};
#[derive(Resource)]
pub struct DitherPostProcessPipeline {
pub layout: BindGroupLayout,
pub screen_sampler: Sampler,
pub threshold_map_sampler: Sampler,
pub pipeline_id: CachedRenderPipelineId,
}
impl FromWorld for DitherPostProcessPipeline {
fn from_world(world: &mut World) -> Self {
let render_device = world.resource::<RenderDevice>();
let layout = render_device.create_bind_group_layout(
"dither_post_process_bind_group_layout",
&BindGroupLayoutEntries::sequential(
ShaderStages::FRAGMENT,
(
texture_2d(TextureSampleType::Float { filterable: true }),
sampler(SamplerBindingType::Filtering),
texture_2d(TextureSampleType::Float { filterable: true }),
sampler(SamplerBindingType::Filtering),
),
),
);
let screen_sampler = render_device.create_sampler(&SamplerDescriptor::default());
let threshold_map_sampler = render_device.create_sampler(&SamplerDescriptor::default());
let shader = world.resource::<AssetServer>().load::<Shader>(
"embedded://grex_dither_post_process/../assets/shaders/dither_post_process.wgsl",
);
let pipeline_id =
world
.resource_mut::<PipelineCache>()
.queue_render_pipeline(RenderPipelineDescriptor {
label: Some("dither_post_process_render_pipeline".into()),
layout: vec![layout.clone()],
push_constant_ranges: vec![],
vertex: fullscreen_shader_vertex_state(),
primitive: PrimitiveState::default(),
depth_stencil: None,
multisample: MultisampleState::default(),
fragment: Some(FragmentState {
shader,
shader_defs: vec![],
entry_point: "fragment".into(),
targets: vec![Some(ColorTargetState {
format: TextureFormat::bevy_default(),
blend: None,
write_mask: ColorWrites::ALL,
})],
}),
});
Self {
layout,
screen_sampler,
threshold_map_sampler,
pipeline_id,
}
}
}