From 2c608e83f1b8d00191bc743ee6ce4aac2fbee06f Mon Sep 17 00:00:00 2001
From: Josh Simmons <josh@nega.tv>
Date: Sat, 11 May 2024 12:03:46 +0200
Subject: [PATCH] narcissus-gpu: Expose `is_null` for `Handle` newtypes

---
 engine/narcissus-gpu/src/lib.rs | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/engine/narcissus-gpu/src/lib.rs b/engine/narcissus-gpu/src/lib.rs
index fc8e284..10a88f4 100644
--- a/engine/narcissus-gpu/src/lib.rs
+++ b/engine/narcissus-gpu/src/lib.rs
@@ -48,11 +48,24 @@ pub struct Extent3d {
     pub depth: u32,
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash, Default)]
-pub struct Image(Handle);
+macro_rules! handle_newtype {
+    ($name:ident) => {
+        #[derive(Clone, Copy, PartialEq, Eq, Hash, Default)]
+        pub struct $name(Handle);
+
+        impl $name {
+            pub fn is_null(self) -> bool {
+                self.0.is_null()
+            }
+        }
+    };
+}
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Buffer(Handle);
+handle_newtype!(Image);
+handle_newtype!(Buffer);
+handle_newtype!(Sampler);
+handle_newtype!(BindGroupLayout);
+handle_newtype!(Pipeline);
 
 impl Buffer {
     pub fn to_arg(self) -> BufferArg<'static> {
@@ -60,15 +73,6 @@ impl Buffer {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Sampler(Handle);
-
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-pub struct BindGroupLayout(Handle);
-
-#[derive(Clone, Copy, PartialEq, Eq, Hash)]
-pub struct Pipeline(Handle);
-
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum MemoryLocation {
     Host,
-- 
2.49.0