2020-07-10 09:53:31 +00:00
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use crate::modules::{get_modules, get_path};
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2020-06-08 02:12:41 +00:00
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use proc_macro::TokenStream;
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use quote::{format_ident, quote};
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2020-07-10 09:53:31 +00:00
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use syn::{
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parse::ParseStream, parse_macro_input, Data, DataStruct, DeriveInput, Field, Fields, Path,
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};
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2020-06-08 02:12:41 +00:00
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#[derive(Default)]
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2020-07-10 09:53:31 +00:00
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struct RenderResourceFieldAttributes {
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2020-06-08 02:12:41 +00:00
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pub ignore: bool,
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pub buffer: bool,
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}
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2020-07-10 09:53:31 +00:00
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#[derive(Default)]
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struct RenderResourceAttributes {
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pub from_self: bool,
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2020-06-08 02:12:41 +00:00
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}
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static RENDER_RESOURCE_ATTRIBUTE_NAME: &'static str = "render_resources";
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pub fn derive_render_resources(input: TokenStream) -> TokenStream {
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let ast = parse_macro_input!(input as DeriveInput);
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2020-07-10 09:53:31 +00:00
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let modules = get_modules();
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2020-06-08 02:12:41 +00:00
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let bevy_render_path: Path = get_path(&modules.bevy_render);
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2020-07-10 09:53:31 +00:00
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let attributes = ast
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.attrs
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.iter()
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.find(|a| {
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a.path.get_ident().as_ref().unwrap().to_string() == RENDER_RESOURCE_ATTRIBUTE_NAME
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})
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.map_or_else(
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|| RenderResourceAttributes::default(),
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|a| {
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syn::custom_keyword!(from_self);
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let mut attributes = RenderResourceAttributes::default();
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a.parse_args_with(|input: ParseStream| {
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if let Some(_) = input.parse::<Option<from_self>>()? {
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attributes.from_self = true;
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}
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Ok(())
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})
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.expect("invalid 'render_resources' attribute format");
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attributes
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},
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);
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2020-06-08 02:12:41 +00:00
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let struct_name = &ast.ident;
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let struct_name_string = struct_name.to_string();
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if attributes.from_self {
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TokenStream::from(quote! {
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impl #bevy_render_path::render_resource::RenderResources for #struct_name {
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fn render_resources_len(&self) -> usize {
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1
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}
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fn get_render_resource(&self, index: usize) -> Option<&dyn #bevy_render_path::render_resource::RenderResource> {
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if index == 0 {
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Some(self)
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} else {
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None
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}
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}
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fn get_render_resource_name(&self, index: usize) -> Option<&str> {
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if index == 0 {
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Some(#struct_name_string)
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} else {
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None
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}
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}
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fn iter_render_resources(&self) -> #bevy_render_path::render_resource::RenderResourceIterator {
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#bevy_render_path::render_resource::RenderResourceIterator::new(self)
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}
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}
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})
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} else {
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2020-07-10 09:53:31 +00:00
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let fields = match &ast.data {
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Data::Struct(DataStruct {
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fields: Fields::Named(fields),
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..
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}) => &fields.named,
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_ => panic!("expected a struct with named fields"),
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};
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let field_attributes = fields
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.iter()
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.map(|field| {
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(
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field,
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field
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.attrs
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.iter()
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.find(|a| {
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a.path.get_ident().as_ref().unwrap().to_string()
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== RENDER_RESOURCE_ATTRIBUTE_NAME
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})
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.map_or_else(
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|| RenderResourceFieldAttributes::default(),
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|a| {
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syn::custom_keyword!(ignore);
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syn::custom_keyword!(buffer);
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let mut attributes = RenderResourceFieldAttributes::default();
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a.parse_args_with(|input: ParseStream| {
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if let Some(_) = input.parse::<Option<ignore>>()? {
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attributes.ignore = true;
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} else if let Some(_) = input.parse::<Option<buffer>>()? {
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attributes.buffer = true;
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}
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Ok(())
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})
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.expect("invalid 'render_resources' attribute format");
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2020-06-08 02:12:41 +00:00
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2020-07-10 09:53:31 +00:00
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attributes
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},
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),
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)
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})
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.collect::<Vec<(&Field, RenderResourceFieldAttributes)>>();
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2020-06-08 02:12:41 +00:00
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let mut render_resource_names = Vec::new();
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let mut render_resource_fields = Vec::new();
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let mut render_resource_hints = Vec::new();
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for (field, attrs) in field_attributes.iter() {
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if attrs.ignore {
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continue;
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}
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let field_ident = field.ident.as_ref().unwrap();
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let field_name = field_ident.to_string();
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render_resource_fields.push(field_ident);
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render_resource_names.push(format!("{}_{}", struct_name, field_name));
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if attrs.buffer {
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2020-06-15 19:47:35 +00:00
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render_resource_hints.push(
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quote! {Some(#bevy_render_path::render_resource::RenderResourceHints::BUFFER)},
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)
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2020-06-08 02:12:41 +00:00
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} else {
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render_resource_hints.push(quote! {None})
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}
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}
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let render_resource_count = render_resource_names.len();
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let render_resource_indices = 0..render_resource_count;
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let struct_name_uppercase = struct_name_string.to_uppercase();
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let render_resource_names_ident =
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format_ident!("{}_RENDER_RESOURCE_NAMES", struct_name_uppercase);
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let render_resource_hints_ident =
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format_ident!("{}_RENDER_RESOURCE_HINTS", struct_name_uppercase);
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TokenStream::from(quote! {
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static #render_resource_names_ident: &[&str] = &[
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#(#render_resource_names,)*
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];
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static #render_resource_hints_ident: &[Option<#bevy_render_path::render_resource::RenderResourceHints>] = &[
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#(#render_resource_hints,)*
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];
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impl #bevy_render_path::render_resource::RenderResources for #struct_name {
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fn render_resources_len(&self) -> usize {
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#render_resource_count
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}
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fn get_render_resource(&self, index: usize) -> Option<&dyn #bevy_render_path::render_resource::RenderResource> {
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match index {
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#(#render_resource_indices => Some(&self.#render_resource_fields),)*
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_ => None,
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}
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}
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fn get_render_resource_name(&self, index: usize) -> Option<&str> {
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Some(#render_resource_names_ident[index])
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}
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fn get_render_resource_hints(&self, index: usize) -> Option<#bevy_render_path::render_resource::RenderResourceHints> {
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#render_resource_hints_ident[index].clone()
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}
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fn iter_render_resources(&self) -> #bevy_render_path::render_resource::RenderResourceIterator {
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#bevy_render_path::render_resource::RenderResourceIterator::new(self)
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}
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}
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})
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}
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}
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