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#![warn(missing_docs)]
//! A plugin for the Bevy game engine which provides an outline post-process effect. The effect
//! makes use of a normal and depth prepass to generate outlines where significant differences in the values
//! occur.
use bevy::{
asset::embedded_asset,
core_pipeline::core_3d::graph::{Core3d, Node3d},
prelude::*,
render::{
extract_component::{ExtractComponentPlugin, UniformComponentPlugin},
render_graph::{RenderGraphApp, ViewNodeRunner},
RenderApp,
},
};
use components::OutlinePostProcessSettings;
pub use nodes::OutlineRenderLabel;
/// Components used by this plugin.
pub mod components;
mod nodes;
mod resources;
/// Plugin which provides an outline post-processing effect.
pub struct OutlinePostProcessPlugin;
impl Plugin for OutlinePostProcessPlugin {
fn build(&self, app: &mut App) {
embedded_asset!(app, "../assets/shaders/outline_post_process.wgsl");
app.add_plugins((
UniformComponentPlugin::<components::OutlinePostProcessSettings>::default(),
ExtractComponentPlugin::<components::OutlinePostProcessSettings>::default(),
))
.add_systems(Update, update_shader_clip_planes);
let Some(render_app) = app.get_sub_app_mut(RenderApp) else {
return;
};
render_app
.add_render_graph_node::<ViewNodeRunner<nodes::OutlineRenderNode>>(
Core3d,
nodes::OutlineRenderLabel,
)
.add_render_graph_edges(
Core3d,
(
Node3d::Tonemapping,
nodes::OutlineRenderLabel,
Node3d::EndMainPassPostProcessing,
),
);
}
fn finish(&self, app: &mut App) {
let Some(render_app) = app.get_sub_app_mut(RenderApp) else {
return;
};
render_app.init_resource::<resources::OutlinePostProcessPipeline>();
}
}
fn update_shader_clip_planes(
mut settings_query: Query<(Ref<Projection>, &mut OutlinePostProcessSettings)>,
) {
for (projection, mut settings) in settings_query.iter_mut() {
if projection.is_changed() {
if let Projection::Perspective(projection) = projection.into_inner() {
settings.camera_near = projection.near;
}
}
}
}
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