Ash variant of a difftest

Author: LegNeato

Cargo.lock

@@ -109,7 +109,7 @@ The library provides helper types for common test patterns:
 **Backend types:**
 
 - `WgpuBackend` - Default wgpu-based compute backend
-- `VulkanoBackend` - Vulkano-based compute backend (useful for testing different GPU drivers)
+- `AshBackend` - Ash-based compute backend (low-level Vulkan access for debugging driver issues)
 
 For examples, see:
 

tests/difftests/README.md

@@ -20,7 +20,7 @@ spirv-builder.workspace = true
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 wgpu = { version = "25.0.2", features = ["spirv", "vulkan-portability", "static-dxc"] }
-vulkano = { version = "0.35.1", default-features = false }
+ash = { version = "0.38", default-features = false }
 naga = { version = "25.0.1", features = ["glsl-in", "spv-out"] }
 tempfile = "3.5"
 futures = "0.3.31"