116 lines
3.4 KiB
Rust
116 lines
3.4 KiB
Rust
use bevy_asset::{Asset, Assets, Handle};
|
|
|
|
use crate::{pipeline::RenderPipelines, Texture};
|
|
pub use bevy_derive::ShaderDefs;
|
|
use bevy_ecs::system::{Query, Res};
|
|
|
|
/// Something that can either be "defined" or "not defined". This is used to determine if a "shader
|
|
/// def" should be considered "defined"
|
|
pub trait ShaderDef {
|
|
fn is_defined(&self) -> bool;
|
|
}
|
|
|
|
/// A collection of "shader defs", which define compile time definitions for shaders.
|
|
pub trait ShaderDefs {
|
|
fn shader_defs_len(&self) -> usize;
|
|
fn get_shader_def(&self, index: usize) -> Option<&str>;
|
|
fn iter_shader_defs(&self) -> ShaderDefIterator;
|
|
}
|
|
|
|
/// Iterates over all [ShaderDef] items in [ShaderDefs]
|
|
pub struct ShaderDefIterator<'a> {
|
|
shader_defs: &'a dyn ShaderDefs,
|
|
index: usize,
|
|
}
|
|
|
|
impl<'a> ShaderDefIterator<'a> {
|
|
pub fn new(shader_defs: &'a dyn ShaderDefs) -> Self {
|
|
Self {
|
|
shader_defs,
|
|
index: 0,
|
|
}
|
|
}
|
|
}
|
|
impl<'a> Iterator for ShaderDefIterator<'a> {
|
|
type Item = &'a str;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
loop {
|
|
if self.index == self.shader_defs.shader_defs_len() {
|
|
return None;
|
|
}
|
|
let shader_def = self.shader_defs.get_shader_def(self.index);
|
|
self.index += 1;
|
|
if shader_def.is_some() {
|
|
return shader_def;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl ShaderDef for bool {
|
|
fn is_defined(&self) -> bool {
|
|
*self
|
|
}
|
|
}
|
|
|
|
impl ShaderDef for Option<Handle<Texture>> {
|
|
fn is_defined(&self) -> bool {
|
|
self.is_some()
|
|
}
|
|
}
|
|
|
|
/// Updates [RenderPipelines] with the latest [ShaderDefs]
|
|
pub fn shader_defs_system<T>(mut query: Query<(&T, &mut RenderPipelines)>)
|
|
where
|
|
T: ShaderDefs + Send + Sync + 'static,
|
|
{
|
|
for (shader_defs, mut render_pipelines) in query.iter_mut() {
|
|
for shader_def in shader_defs.iter_shader_defs() {
|
|
for render_pipeline in render_pipelines.pipelines.iter_mut() {
|
|
render_pipeline
|
|
.specialization
|
|
.shader_specialization
|
|
.shader_defs
|
|
.insert(shader_def.to_string());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Clears each [RenderPipelines]' shader defs collection
|
|
pub fn clear_shader_defs_system(mut query: Query<&mut RenderPipelines>) {
|
|
for mut render_pipelines in query.iter_mut() {
|
|
for render_pipeline in render_pipelines.pipelines.iter_mut() {
|
|
render_pipeline
|
|
.specialization
|
|
.shader_specialization
|
|
.shader_defs
|
|
.clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Updates [RenderPipelines] with the latest [ShaderDefs] from a given asset type
|
|
pub fn asset_shader_defs_system<T: Asset>(
|
|
assets: Res<Assets<T>>,
|
|
mut query: Query<(&Handle<T>, &mut RenderPipelines)>,
|
|
) where
|
|
T: ShaderDefs + Send + Sync + 'static,
|
|
{
|
|
for (asset_handle, mut render_pipelines) in query.iter_mut() {
|
|
if let Some(asset_handle) = assets.get(asset_handle) {
|
|
let shader_defs = asset_handle;
|
|
for shader_def in shader_defs.iter_shader_defs() {
|
|
for render_pipeline in render_pipelines.pipelines.iter_mut() {
|
|
render_pipeline
|
|
.specialization
|
|
.shader_specialization
|
|
.shader_defs
|
|
.insert(shader_def.to_string());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|