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use Material for wireframes (bevyengine#5314)
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# Objective

- Use the `Material` abstraction for the Wireframes
- Right now this doesn't have many benefits other than simplifying some
of the rendering code
- We can reuse the default vertex shader and avoid rendering
inconsistencies
- The goal is to have a material with a color on each mesh so this
approach will make it easier to implement
- Originally done in bevyengine#5303 but I
decided to split the Material part to it's own PR and then adding
per-entity colors and globally configurable colors will be a much
simpler diff.

## Solution

- Use the new `Material` abstraction for the Wireframes

## Notes

It's possible this isn't ideal since this adds a
`Handle<WireframeMaterial>` to all the meshes compared to the original
approach that didn't need anything. I didn't notice any performance
impact on my machine.

This might be a surprising usage of `Material` at first, because
intuitively you only have one material per mesh, but the way it's
implemented you can have as many different types of materials as you
want on a mesh.

## Migration Guide
`WireframePipeline` was removed. If you were using it directly, please
create an issue explaining your use case.

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
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@IceSentry @alice-i-cecile
2 people authored and Thomas Wilgenbus committed Oct 13, 2023
1 parent 4351434 commit cef1899
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Showing 3 changed files with 132 additions and 222 deletions.
66 changes: 3 additions & 63 deletions crates/bevy_pbr/src/render/wireframe.wgsl
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Original file line number Diff line number Diff line change
@@ -1,66 +1,6 @@
#import bevy_pbr::mesh_bindings mesh
#import bevy_pbr::mesh_functions get_model_matrix, mesh_position_local_to_clip
#import bevy_pbr::morph

#ifdef SKINNED
#import bevy_pbr::skinning
#endif

struct Vertex {
@builtin(instance_index) instance_index: u32,
@location(0) position: vec3<f32>,
#ifdef SKINNED
@location(5) joint_indexes: vec4<u32>,
@location(6) joint_weights: vec4<f32>,
#endif
#ifdef MORPH_TARGETS
@builtin(vertex_index) index: u32,
#endif
};

struct VertexOutput {
@builtin(position) clip_position: vec4<f32>,
};


#ifdef MORPH_TARGETS
fn morph_vertex(vertex_in: Vertex) -> Vertex {
var vertex = vertex_in;
let weight_count = bevy_pbr::morph::layer_count();
for (var i: u32 = 0u; i < weight_count; i ++) {
let weight = bevy_pbr::morph::weight_at(i);
if weight == 0.0 {
continue;
}
vertex.position += weight * bevy_pbr::morph::morph(vertex.index, bevy_pbr::morph::position_offset, i);
}
return vertex;
}
#endif

@vertex
fn vertex(vertex_no_morph: Vertex) -> VertexOutput {

#ifdef MORPH_TARGETS
var vertex = morph_vertex(vertex_no_morph);
#else
var vertex = vertex_no_morph;
#endif

#ifdef SKINNED
let model = bevy_pbr::skinning::skin_model(vertex.joint_indexes, vertex.joint_weights);
#else
// Use vertex_no_morph.instance_index instead of vertex.instance_index to work around a wgpu dx12 bug.
// See https://github.com/gfx-rs/naga/issues/2416 .
let model = get_model_matrix(vertex_no_morph.instance_index);
#endif

var out: VertexOutput;
out.clip_position = mesh_position_local_to_clip(model, vec4<f32>(vertex.position, 1.0));
return out;
}
#import bevy_pbr::mesh_vertex_output MeshVertexOutput

@fragment
fn fragment() -> @location(0) vec4<f32> {
fn fragment(in: MeshVertexOutput) -> @location(0) vec4<f32> {
return vec4<f32>(1.0, 1.0, 1.0, 1.0);
}
}
259 changes: 108 additions & 151 deletions crates/bevy_pbr/src/wireframe.rs
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Original file line number Diff line number Diff line change
@@ -1,30 +1,28 @@
use crate::{
DrawMesh, MeshPipeline, MeshPipelineKey, RenderMeshInstance, RenderMeshInstances,
SetMeshBindGroup, SetMeshViewBindGroup,
};
use bevy_app::Plugin;
use bevy_asset::{load_internal_asset, Handle};
use bevy_core_pipeline::core_3d::Opaque3d;
use bevy_derive::{Deref, DerefMut};
use bevy_ecs::{prelude::*, reflect::ReflectComponent};
use bevy_reflect::{std_traits::ReflectDefault, Reflect};
use crate::{Material, MaterialPipeline, MaterialPipelineKey, MaterialPlugin};
use bevy_app::{Plugin, Startup, Update};
use bevy_asset::{load_internal_asset, Asset, Assets, Handle};
use bevy_ecs::prelude::*;
use bevy_reflect::{std_traits::ReflectDefault, Reflect, TypePath, TypeUuid};
use bevy_render::{
extract_resource::{ExtractResource, ExtractResourcePlugin},
extract_resource::ExtractResource,
mesh::{Mesh, MeshVertexBufferLayout},
render_asset::RenderAssets,
render_phase::{AddRenderCommand, DrawFunctions, RenderPhase, SetItemPipeline},
prelude::Shader,
render_resource::{
PipelineCache, PolygonMode, RenderPipelineDescriptor, Shader, SpecializedMeshPipeline,
SpecializedMeshPipelineError, SpecializedMeshPipelines,
AsBindGroup, PolygonMode, RenderPipelineDescriptor, ShaderRef, SpecializedMeshPipelineError,
},
view::{ExtractedView, Msaa, VisibleEntities},
RenderApp, RenderSet,
};
use bevy_render::{Extract, ExtractSchedule, Render};
use bevy_utils::{tracing::error, EntityHashSet};

pub const WIREFRAME_SHADER_HANDLE: Handle<Shader> = Handle::weak_from_u128(192598014480025766);

/// A [`Plugin`] that draws wireframes.
///
/// Wireframes currently do not work when using webgl or webgpu.
/// Supported rendering backends:
/// - DX12
/// - Vulkan
/// - Metal
///
/// This is a native only feature.
#[derive(Debug, Default)]
pub struct WireframePlugin;

Expand All @@ -41,23 +39,12 @@ impl Plugin for WireframePlugin {
.register_type::<NoWireframe>()
.register_type::<WireframeConfig>()
.init_resource::<WireframeConfig>()
.add_plugins((ExtractResourcePlugin::<WireframeConfig>::default(),));

if let Ok(render_app) = app.get_sub_app_mut(RenderApp) {
render_app
.add_render_command::<Opaque3d, DrawWireframes>()
.init_resource::<SpecializedMeshPipelines<WireframePipeline>>()
.init_resource::<Wireframes>()
.init_resource::<NoWireframes>()
.add_systems(ExtractSchedule, extract_wireframes)
.add_systems(Render, queue_wireframes.in_set(RenderSet::QueueMeshes));
}
}

fn finish(&self, app: &mut bevy_app::App) {
if let Ok(render_app) = app.get_sub_app_mut(RenderApp) {
render_app.init_resource::<WireframePipeline>();
}
.add_plugins(MaterialPlugin::<WireframeMaterial>::default())
.add_systems(Startup, setup_global_wireframe_material)
.add_systems(
Update,
(apply_global_wireframe_material, apply_wireframe_material),
);
}
}

Expand Down Expand Up @@ -85,133 +72,103 @@ pub struct WireframeConfig {
pub global: bool,
}

#[derive(Resource, Default, Deref, DerefMut)]
pub struct Wireframes(EntityHashSet<Entity>);

#[derive(Resource, Default, Deref, DerefMut)]
pub struct NoWireframes(EntityHashSet<Entity>);
#[derive(Resource)]
struct GlobalWireframeMaterial {
// This handle will be reused when the global config is enabled
handle: Handle<WireframeMaterial>,
}

fn extract_wireframes(
mut wireframes: ResMut<Wireframes>,
mut no_wireframes: ResMut<NoWireframes>,
wireframe_query: Extract<Query<Entity, With<Wireframe>>>,
no_wireframe_query: Extract<Query<Entity, With<NoWireframe>>>,
fn setup_global_wireframe_material(
mut commands: Commands,
mut materials: ResMut<Assets<WireframeMaterial>>,
) {
wireframes.clear();
wireframes.extend(wireframe_query.iter());
no_wireframes.clear();
no_wireframes.extend(no_wireframe_query.iter());
// Create the handle used for the global material
commands.insert_resource(GlobalWireframeMaterial {
handle: materials.add(WireframeMaterial {}),
});
}

#[derive(Resource, Clone)]
pub struct WireframePipeline {
mesh_pipeline: MeshPipeline,
shader: Handle<Shader>,
/// Applies or remove the wireframe material to any mesh with a [`Wireframe`] component.
fn apply_wireframe_material(
mut commands: Commands,
mut materials: ResMut<Assets<WireframeMaterial>>,
wireframes: Query<Entity, (With<Wireframe>, Without<Handle<WireframeMaterial>>)>,
mut removed_wireframes: RemovedComponents<Wireframe>,
) {
for e in removed_wireframes.read() {
if let Some(mut commands) = commands.get_entity(e) {
commands.remove::<Handle<WireframeMaterial>>();
}
}

let mut wireframes_to_spawn = vec![];
for e in &wireframes {
wireframes_to_spawn.push((e, materials.add(WireframeMaterial {})));
}
commands.insert_or_spawn_batch(wireframes_to_spawn);
}
impl FromWorld for WireframePipeline {
fn from_world(render_world: &mut World) -> Self {
WireframePipeline {
mesh_pipeline: render_world.resource::<MeshPipeline>().clone(),
shader: WIREFRAME_SHADER_HANDLE,

/// Applies or removes a wireframe material on any mesh without a [`Wireframe`] component.
#[allow(clippy::type_complexity)]
fn apply_global_wireframe_material(
mut commands: Commands,
config: Res<WireframeConfig>,
meshes_without_material: Query<
Entity,
(
With<Handle<Mesh>>,
Without<Wireframe>,
Without<NoWireframe>,
Without<Handle<WireframeMaterial>>,
),
>,
meshes_with_global_material: Query<
Entity,
(
With<Handle<Mesh>>,
Without<Wireframe>,
Without<NoWireframe>,
With<Handle<WireframeMaterial>>,
),
>,
global_material: Res<GlobalWireframeMaterial>,
) {
if !config.is_changed() {
return;
}

if config.global {
let mut material_to_spawn = vec![];
for e in &meshes_without_material {
// We only add the material handle but not the Wireframe component
// This makes it easy to detect which mesh is using the global material and which ones are user specified
material_to_spawn.push((e, global_material.handle.clone()));
}
commands.insert_or_spawn_batch(material_to_spawn);
} else if !config.global {
for e in &meshes_with_global_material {
commands.entity(e).remove::<Handle<WireframeMaterial>>();
}
}
}

impl SpecializedMeshPipeline for WireframePipeline {
type Key = MeshPipelineKey;
#[derive(Default, AsBindGroup, TypeUuid, TypePath, Debug, Clone, Asset)]
#[uuid = "9e694f70-9963-4418-8bc1-3474c66b13b8"]
struct WireframeMaterial {}

impl Material for WireframeMaterial {
fn fragment_shader() -> ShaderRef {
WIREFRAME_SHADER_HANDLE.into()
}

fn specialize(
&self,
key: Self::Key,
layout: &MeshVertexBufferLayout,
) -> Result<RenderPipelineDescriptor, SpecializedMeshPipelineError> {
let mut descriptor = self.mesh_pipeline.specialize(key, layout)?;
descriptor.vertex.shader = self.shader.clone_weak();
descriptor
.vertex
.shader_defs
.push("MESH_BINDGROUP_1".into());
descriptor.fragment.as_mut().unwrap().shader = self.shader.clone_weak();
_pipeline: &MaterialPipeline<Self>,
descriptor: &mut RenderPipelineDescriptor,
_layout: &MeshVertexBufferLayout,
_key: MaterialPipelineKey<Self>,
) -> Result<(), SpecializedMeshPipelineError> {
descriptor.primitive.polygon_mode = PolygonMode::Line;
descriptor.depth_stencil.as_mut().unwrap().bias.slope_scale = 1.0;
Ok(descriptor)
}
}

#[allow(clippy::too_many_arguments)]
fn queue_wireframes(
opaque_3d_draw_functions: Res<DrawFunctions<Opaque3d>>,
render_meshes: Res<RenderAssets<Mesh>>,
render_mesh_instances: Res<RenderMeshInstances>,
wireframes: Res<Wireframes>,
no_wireframes: Res<NoWireframes>,
wireframe_config: Res<WireframeConfig>,
wireframe_pipeline: Res<WireframePipeline>,
mut pipelines: ResMut<SpecializedMeshPipelines<WireframePipeline>>,
pipeline_cache: Res<PipelineCache>,
msaa: Res<Msaa>,
mut views: Query<(&ExtractedView, &VisibleEntities, &mut RenderPhase<Opaque3d>)>,
) {
let draw_custom = opaque_3d_draw_functions.read().id::<DrawWireframes>();
let msaa_key = MeshPipelineKey::from_msaa_samples(msaa.samples());
for (view, visible_entities, mut opaque_phase) in &mut views {
let rangefinder = view.rangefinder3d();

let view_key = msaa_key | MeshPipelineKey::from_hdr(view.hdr);
let add_render_phase = |phase_item: (Entity, &RenderMeshInstance)| {
let (entity, mesh_instance) = phase_item;

let Some(mesh) = render_meshes.get(mesh_instance.mesh_asset_id) else {
return;
};
let mut key =
view_key | MeshPipelineKey::from_primitive_topology(mesh.primitive_topology);
if mesh.morph_targets.is_some() {
key |= MeshPipelineKey::MORPH_TARGETS;
}
let pipeline_id =
pipelines.specialize(&pipeline_cache, &wireframe_pipeline, key, &mesh.layout);
let pipeline_id = match pipeline_id {
Ok(id) => id,
Err(err) => {
error!("{}", err);
return;
}
};
opaque_phase.add(Opaque3d {
entity,
pipeline: pipeline_id,
draw_function: draw_custom,
distance: rangefinder
.distance_translation(&mesh_instance.transforms.transform.translation),
batch_range: 0..1,
dynamic_offset: None,
});
};

visible_entities
.entities
.iter()
.filter_map(|visible_entity| {
if no_wireframes.get(visible_entity).is_some() {
return None;
}

if wireframe_config.global || wireframes.get(visible_entity).is_some() {
render_mesh_instances
.get(visible_entity)
.map(|mesh_instance| (*visible_entity, mesh_instance))
} else {
None
}
})
.for_each(add_render_phase);
Ok(())
}
}

type DrawWireframes = (
SetItemPipeline,
SetMeshViewBindGroup<0>,
SetMeshBindGroup<1>,
DrawMesh,
);
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