always enable dx12 for egui_kittest's wgpu feature

Cargo.lock

@@ -1348,7 +1348,6 @@ dependencies = [
  "egui_kittest",
  "serde",
  "unicode_names2",
- "wgpu",
 ]
 
 [[package]]
@@ -1926,6 +1925,18 @@ dependencies = [
  "bitflags 2.6.0",
 ]
 
+[[package]]
+name = "gpu-allocator"
+version = "0.27.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c151a2a5ef800297b4e79efa4f4bec035c5f51d5ae587287c9b952bdf734cacd"
+dependencies = [
+ "log",
+ "presser",
+ "thiserror",
+ "windows",
+]
+
 [[package]]
 name = "gpu-descriptor"
 version = "0.3.0"
@@ -3109,6 +3120,12 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "presser"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8cf8e6a8aa66ce33f63993ffc4ea4271eb5b0530a9002db8455ea6050c77bfa"
+
 [[package]]
 name = "proc-macro-crate"
 version = "3.2.0"
@@ -3262,6 +3279,12 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "range-alloc"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8a99fddc9f0ba0a85884b8d14e3592853e787d581ca1816c91349b10e4eeab"
+
 [[package]]
 name = "raw-window-handle"
 version = "0.5.2"
@@ -4512,6 +4535,7 @@ dependencies = [
  "android_system_properties",
  "arrayvec",
  "ash",
+ "bit-set 0.8.0",
  "bitflags 2.6.0",
  "block",
  "bytemuck",
@@ -4520,6 +4544,7 @@ dependencies = [
  "glow 0.14.2",
  "glutin_wgl_sys",
  "gpu-alloc",
+ "gpu-allocator",
  "gpu-descriptor",
  "js-sys",
  "khronos-egl",
@@ -4533,6 +4558,7 @@ dependencies = [
  "once_cell",
  "parking_lot",
  "profiling",
+ "range-alloc",
  "raw-window-handle 0.6.2",
  "renderdoc-sys",
  "rustc-hash",
@@ -4542,6 +4568,7 @@ dependencies = [
  "web-sys",
  "wgpu-types",
  "windows",
+ "windows-core 0.58.0",
 ]
 
 [[package]]

crates/egui-wgpu/src/lib.rs

@@ -303,7 +303,7 @@ pub enum WgpuSetup {
     /// supported backends, power preferences, and device description.
     ///
     /// By default can also be configured with the environment variables:
-    /// * `WGPU_BACKEND`: `vulkan`, `dx11`, `dx12`, `metal`, `opengl`, `webgpu`
+    /// * `WGPU_BACKEND`: `vulkan`, `dx12`, `metal`, `opengl`, `webgpu`
     /// * `WGPU_POWER_PREF`: `low`, `high` or `none`
     /// * `WGPU_TRACE`: Path to a file to output a wgpu trace file.
     CreateNew(WgpuSetupCreateNew),

crates/egui_demo_lib/Cargo.toml

@@ -57,7 +57,6 @@ serde = { workspace = true, optional = true }
 [dev-dependencies]
 criterion.workspace = true
 egui_kittest = { workspace = true, features = ["wgpu", "snapshot"] }
-wgpu = { workspace = true, features = ["metal"] }
 egui = { workspace = true, features = ["default_fonts"] }
 
 [[bench]]

crates/egui_kittest/Cargo.toml

@@ -20,7 +20,13 @@ include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
 
 [features]
 # Adds a wgpu-based test renderer.
-wgpu = ["dep:egui-wgpu", "dep:pollster", "dep:image", "eframe?/wgpu"]
+wgpu = [
+    "dep:egui-wgpu",
+    "dep:pollster",
+    "dep:image",
+    "dep:wgpu",
+    "eframe?/wgpu",
+]
 
 # Adds a dify-based image snapshot utility.
 snapshot = ["dep:dify", "dep:image", "image/png"]
@@ -38,6 +44,8 @@ eframe = { workspace = true, optional = true }
 egui-wgpu = { workspace = true, optional = true }
 pollster = { workspace = true, optional = true }
 image = { workspace = true, optional = true }
+# Enable DX12 because it always comes with a software rasterizer.
+wgpu = { workspace = true, features = ["metal", "dx12"], optional = true }
 
 # snapshot dependencies
 dify = { workspace = true, optional = true }
@@ -48,7 +56,6 @@ document-features = { workspace = true, optional = true }
 [dev-dependencies]
 egui = { workspace = true, features = ["default_fonts"] }
 image = { workspace = true, features = ["png"] }
-wgpu = { workspace = true, features = ["metal"] }
 
 [lints]
 workspace = true