From c95887b4df7a898e1eec9392984fd470f349ca73 Mon Sep 17 00:00:00 2001
From: Chad Brokaw <cbrokaw@gmail.com>
Date: Tue, 10 May 2022 04:09:02 -0400
Subject: [PATCH] Change metal format to BGRA8Unorm

This should fix channel swizzling on M1 and restore functionality on Intel
---
 piet-gpu-hal/src/metal.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/piet-gpu-hal/src/metal.rs b/piet-gpu-hal/src/metal.rs
index 307def8..03a23b0 100644
--- a/piet-gpu-hal/src/metal.rs
+++ b/piet-gpu-hal/src/metal.rs
@@ -350,7 +350,7 @@ impl crate::backend::Device for MtlDevice {
         //desc.set_mipmap_level_count(1);
         let mtl_format = match format {
             ImageFormat::A8 => metal::MTLPixelFormat::R8Unorm,
-            ImageFormat::Rgba8 => metal::MTLPixelFormat::RGBA8Unorm,
+            ImageFormat::Rgba8 => metal::MTLPixelFormat::BGRA8Unorm,
         };
         desc.set_pixel_format(mtl_format);
         desc.set_usage(metal::MTLTextureUsage::ShaderRead | metal::MTLTextureUsage::ShaderWrite);