From 9142e37344b8fb178da5d0c601300836b34b4e7e Mon Sep 17 00:00:00 2001
From: dobkeratops <dobkeratops_foo@hotmail.com>
Date: Tue, 20 Sep 2022 21:31:28 +0100
Subject: [PATCH 1/2] added convenience, build buffer from slice, leveraging
 rust generics & slice type

---
 examples/compute/main.rs |  9 +++------
 src/device.rs            | 12 ++++++++++++
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/examples/compute/main.rs b/examples/compute/main.rs
index 6497c790..02cc442b 100644
--- a/examples/compute/main.rs
+++ b/examples/compute/main.rs
@@ -19,17 +19,14 @@ fn main() {
             24, 25, 26, 27, 28, 29, 30,
         ];
 
-        let buffer = device.new_buffer_with_data(
-            unsafe { mem::transmute(data.as_ptr()) },
-            (data.len() * mem::size_of::<u32>()) as u64,
+        let buffer = device.new_buffer_from_slice(&data[..],
             MTLResourceOptions::CPUCacheModeDefaultCache,
         );
 
         let sum = {
             let data = [0u32];
-            device.new_buffer_with_data(
-                unsafe { mem::transmute(data.as_ptr()) },
-                (data.len() * mem::size_of::<u32>()) as u64,
+            device.new_buffer_from_slice(
+                &data[..],
                 MTLResourceOptions::CPUCacheModeDefaultCache,
             )
         };
diff --git a/src/device.rs b/src/device.rs
index 1cb0a407..ed698d83 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -1965,6 +1965,18 @@ impl DeviceRef {
                                        options:options]
         }
     }
+    
+    pub fn new_buffer_from_slice<T:Copy>(
+        &self,
+        data:&[T],
+        options:MTLResourceOptions 
+    )-> Buffer {
+        self.new_buffer_with_data(
+            &data[0] as *const _ as *const std::ffi::c_void,
+            (data.len() * std::mem::size_of::<T>()) as NSUInteger,
+            options
+        )
+    }
 
     pub fn new_texture(&self, descriptor: &TextureDescriptorRef) -> Texture {
         unsafe { msg_send![self, newTextureWithDescriptor: descriptor] }

From 3dc3727d56e4a2094c0cef1b23c2dfc84c3a7951 Mon Sep 17 00:00:00 2001
From: dobkeratops <dobkeratops@users.noreply.github.com>
Date: Tue, 20 Sep 2022 23:45:40 +0100
Subject: [PATCH 2/2] Update src/device.rs

Co-authored-by: Mads Marquart <mads@marquart.dk>
---
 src/device.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/device.rs b/src/device.rs
index ed698d83..4eb3e718 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -1972,7 +1972,7 @@ impl DeviceRef {
         options:MTLResourceOptions 
     )-> Buffer {
         self.new_buffer_with_data(
-            &data[0] as *const _ as *const std::ffi::c_void,
+            data.as_ptr().cast::<std::ffi::c_void>(),
             (data.len() * std::mem::size_of::<T>()) as NSUInteger,
             options
         )