From d8d3fdf2cfa53c511e8e8156fe1c8a749a20f159 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois?= <mockersf@gmail.com>
Date: Wed, 29 Dec 2021 21:04:29 +0000
Subject: [PATCH] remove dead code: ShaderDefs derive (#3490)
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# Objective

- remove some dead code and see if someone isn't happy about it


Co-authored-by: François <8672791+mockersf@users.noreply.github.com>
---
 crates/bevy_derive/src/lib.rs         |  8 ----
 crates/bevy_derive/src/modules.rs     |  1 -
 crates/bevy_derive/src/shader_defs.rs | 65 ---------------------------
 3 files changed, 74 deletions(-)
 delete mode 100644 crates/bevy_derive/src/shader_defs.rs

diff --git a/crates/bevy_derive/src/lib.rs b/crates/bevy_derive/src/lib.rs
index 242a9a244fa7d..902e92216e1c6 100644
--- a/crates/bevy_derive/src/lib.rs
+++ b/crates/bevy_derive/src/lib.rs
@@ -5,7 +5,6 @@ mod bevy_main;
 mod bytes;
 mod enum_variant_meta;
 mod modules;
-mod shader_defs;
 
 use bevy_macro_utils::{derive_label, BevyManifest};
 use proc_macro::TokenStream;
@@ -17,13 +16,6 @@ pub fn derive_bytes(input: TokenStream) -> TokenStream {
     bytes::derive_bytes(input)
 }
 
-/// Derives the ShaderDefs trait. Each field must implement ShaderDef or this will fail.
-/// You can ignore fields using `#[shader_defs(ignore)]`.
-#[proc_macro_derive(ShaderDefs, attributes(shader_def))]
-pub fn derive_shader_defs(input: TokenStream) -> TokenStream {
-    shader_defs::derive_shader_defs(input)
-}
-
 /// Generates a dynamic plugin entry point function for the given `Plugin` type.  
 #[proc_macro_derive(DynamicPlugin)]
 pub fn derive_dynamic_plugin(input: TokenStream) -> TokenStream {
diff --git a/crates/bevy_derive/src/modules.rs b/crates/bevy_derive/src/modules.rs
index e54f09313e356..ae0f3d945e83a 100644
--- a/crates/bevy_derive/src/modules.rs
+++ b/crates/bevy_derive/src/modules.rs
@@ -1,3 +1,2 @@
 pub const BEVY_CORE: &str = "bevy_core";
-pub const BEVY_RENDER: &str = "bevy_render";
 pub const BEVY_UTILS: &str = "bevy_utils";
diff --git a/crates/bevy_derive/src/shader_defs.rs b/crates/bevy_derive/src/shader_defs.rs
deleted file mode 100644
index 41da09eb43e84..0000000000000
--- a/crates/bevy_derive/src/shader_defs.rs
+++ /dev/null
@@ -1,65 +0,0 @@
-use bevy_macro_utils::BevyManifest;
-use inflector::Inflector;
-use proc_macro::TokenStream;
-use quote::quote;
-use syn::{parse_macro_input, Data, DataStruct, DeriveInput, Fields, Path};
-
-static SHADER_DEF_ATTRIBUTE_NAME: &str = "shader_def";
-
-pub fn derive_shader_defs(input: TokenStream) -> TokenStream {
-    let ast = parse_macro_input!(input as DeriveInput);
-    let bevy_render_path: Path = BevyManifest::default().get_path(crate::modules::BEVY_RENDER);
-
-    let fields = match &ast.data {
-        Data::Struct(DataStruct {
-            fields: Fields::Named(fields),
-            ..
-        }) => &fields.named,
-        _ => panic!("Expected a struct with named fields."),
-    };
-
-    let shader_def_idents = fields
-        .iter()
-        .filter(|f| {
-            f.attrs
-                .iter()
-                .any(|a| *a.path.get_ident().as_ref().unwrap() == SHADER_DEF_ATTRIBUTE_NAME)
-        })
-        .map(|f| f.ident.as_ref().unwrap())
-        .collect::<Vec<&syn::Ident>>();
-    let struct_name = &ast.ident;
-    let struct_name_pascal_case = ast.ident.to_string().to_pascal_case();
-    let shader_defs = shader_def_idents
-        .iter()
-        .map(|i| format!("{}_{}", struct_name_pascal_case, i).to_uppercase());
-
-    let shader_defs_len = shader_defs.len();
-    let shader_def_indices = 0..shader_defs_len;
-
-    let generics = ast.generics;
-    let (impl_generics, ty_generics, _where_clause) = generics.split_for_impl();
-
-    TokenStream::from(quote! {
-        impl #impl_generics #bevy_render_path::shader::ShaderDefs for #struct_name #ty_generics {
-            fn shader_defs_len(&self) -> usize {
-                #shader_defs_len
-            }
-
-            fn get_shader_def(&self, index: usize) -> Option<&str> {
-                use #bevy_render_path::shader::ShaderDef;
-                match index {
-                    #(#shader_def_indices => if self.#shader_def_idents.is_defined() {
-                        Some(#shader_defs)
-                    } else {
-                        None
-                    },)*
-                    _ => None,
-                }
-            }
-
-            fn iter_shader_defs(&self) -> #bevy_render_path::shader::ShaderDefIterator {
-                #bevy_render_path::shader::ShaderDefIterator::new(self)
-            }
-        }
-    })
-}