From 396560efc256ac3fe151e963e115e4429ca1c10b Mon Sep 17 00:00:00 2001
From: Charlton Rodda <charlton.rodda@collabora.com>
Date: Tue, 12 Dec 2023 17:03:41 +0000
Subject: [PATCH] Default to dxc compiler because fxc is too slow

This does require dxil.dll and dxcompiler.dll to be available,
falling back to fxc if these cannot be found.
Can be overridden by setting the WGPU_DX12_COMPILER
environment variable to "fxc".
---
 src/graphics/d3d12.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/graphics/d3d12.rs b/src/graphics/d3d12.rs
index 2cc4ea4..5c5e155 100644
--- a/src/graphics/d3d12.rs
+++ b/src/graphics/d3d12.rs
@@ -112,7 +112,12 @@ pub fn initialize_xr_instance(
 
     let instance_descriptor = &wgpu_hal::InstanceDescriptor {
         name: &app_info.name,
-        dx12_shader_compiler: wgpu::util::dx12_shader_compiler_from_env().unwrap_or_default(),
+        dx12_shader_compiler: wgpu::util::dx12_shader_compiler_from_env().unwrap_or(
+            wgpu::Dx12Compiler::Dxc {
+                dxil_path: None,
+                dxc_path: None,
+            },
+        ),
         flags: wgpu::InstanceFlags::from_build_config().with_env(),
         gles_minor_version: Default::default(),
     };