Vulkan on windows via swiftshader

Author: LegNeato

.github/workflows/ci.yaml

@@ -29,6 +29,11 @@ jobs:
         with:
           version: 1.4.309.0
           cache: true
+      - if: ${{ runner.os == 'Windows' }}
+        name: Install Vulkan Runtime with SwiftShader (Windows)
+        uses: NcStudios/[email protected]
+        with:
+          sdkVersion: 1.4.309.0
       - if: ${{ runner.os == 'Linux' }}
         name: Linux - Install native dependencies
         run: sudo apt install libwayland-cursor0 libxkbcommon-dev libwayland-dev
@@ -88,6 +93,11 @@ jobs:
         with:
           version: 1.4.309.0
           cache: true
+      - if: ${{ runner.os == 'Windows' }}
+        name: Install Vulkan Runtime with SwiftShader (Windows)
+        uses: NcStudios/[email protected]
+        with:
+          sdkVersion: 1.4.309.0
       - name: install rust-toolchain
         run: cargo version
       - name: cargo fetch --locked
@@ -129,6 +139,11 @@ jobs:
         with:
           version: 1.4.309.0
           cache: true
+      - if: ${{ runner.os == 'Windows' }}
+        name: Install Vulkan Runtime with SwiftShader (Windows)
+        uses: NcStudios/[email protected]
+        with:
+          sdkVersion: 1.4.309.0
       - name: install rust-toolchain
         run: echo "TARGET=$(rustc --print host-tuple)" >> "$GITHUB_ENV"
       - name: cargo fetch --locked
@@ -149,6 +164,11 @@ jobs:
         with:
           version: 1.4.309.0
           cache: true
+      - if: ${{ runner.os == 'Windows' }}
+        name: Install Vulkan Runtime with SwiftShader (Windows)
+        uses: NcStudios/[email protected]
+        with:
+          sdkVersion: 1.4.309.0
       - if: ${{ runner.os == 'Linux' }}
         name: Linux - Install native dependencies
         run: sudo apt install libwayland-cursor0 libxkbcommon-dev libwayland-dev

tests/difftests/bin/src/differ.rs

@@ -150,7 +150,7 @@ impl NumericType for u32 {
         format!("{}", value)
     }
     fn can_have_relative_diff() -> bool {
-        false
+        true
     }
     fn as_f64(value: Self) -> f64 {
         value as f64
@@ -403,8 +403,8 @@ mod tests {
             _ => panic!("Expected numeric difference"),
         }
         match &diffs[0].relative_diff {
-            DiffMagnitude::Incomparable => {}
-            _ => panic!("Expected incomparable relative diff for U32"),
+            DiffMagnitude::Numeric(val) => assert_eq!(*val, 3.0 / 5.0), // 3/5 = 0.6
+            _ => panic!("Expected numeric relative diff for U32"),
         }
 
         // Check second difference (index 3: 4 vs 7)