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wcandillon · Oct 19, 2024 · 2bc93bc · 2bc93bc
1 parent 7ac3630
commit 2bc93bc
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Showing 2 changed files with 7 additions and 2 deletions.
diff --git a/packages/webgpu/cpp/rnwgpu/api/GPUCanvasContext.cpp b/packages/webgpu/cpp/rnwgpu/api/GPUCanvasContext.cpp
@@ -19,7 +19,10 @@ void GPUCanvasContext::configure(
   if (!conv(surfaceConfiguration.usage, configuration->usage) || !conv(surfaceConfiguration.format, configuration->format)) {
         throw std::runtime_error("Error with SurfaceConfiguration");
   }
+
+#ifdef __APPLE__
   surfaceConfiguration.alphaMode = configuration->alphaMode;
+#endif
   _surfaceInfo->configure(surfaceConfiguration);
 }
 

diff --git a/packages/webgpu/cpp/rnwgpu/api/descriptors/GPUCanvasConfiguration.h b/packages/webgpu/cpp/rnwgpu/api/descriptors/GPUCanvasConfiguration.h
@@ -21,7 +21,7 @@ struct GPUCanvasConfiguration {
   std::optional<double> usage;       // GPUTextureUsageFlags
   std::optional<std::vector<wgpu::TextureFormat>>
       viewFormats; // Iterable<GPUTextureFormat>
-  wgpu::CompositeAlphaMode alphaMode;
+  wgpu::CompositeAlphaMode alphaMode = wgpu::CompositeAlphaMode::Opaque;
 };
 
 } // namespace rnwgpu
@@ -61,7 +61,9 @@ struct JSIConverter<std::shared_ptr<rnwgpu::GPUCanvasConfiguration>> {
       }
       if (value.hasProperty(runtime, "alphaMode")) {
         auto prop = value.getProperty(runtime, "alphaMode").asString(runtime).utf8(runtime);
-        result->alphaMode = prop == "premultiplied" ? wgpu::CompositeAlphaMode::Premultiplied : wgpu::CompositeAlphaMode::Opaque;
+        if (prop == "premultiplied") {
+          result->alphaMode = wgpu::CompositeAlphaMode::Premultiplied;
+        }
       }
     }