Try to handle non-transient attatchment supporting GPUs

filament/backend/src/webgpu/WebGPUHandles.cpp

@@ -514,7 +514,7 @@ WGPUTexture::WGPUTexture(SamplerType target, uint8_t levels, TextureFormat forma
                     "the spec. See https://www.w3.org/TR/webgpu/#texture-creation or "
                     "https://gpuweb.github.io/gpuweb/#multisample-state");
     // First, the texture aspect, starting with the defaults/basic configuration
-    mUsage = fToWGPUTextureUsage(usage);
+    mUsage = fToWGPUTextureUsage(usage, device.HasFeature(wgpu::FeatureName::TransientAttachments));
     mFormat = fToWGPUTextureFormat(format);
     wgpu::TextureDescriptor textureDescriptor{
         .label = getUserTextureLabel(target),
@@ -566,7 +566,8 @@ WGPUTexture::WGPUTexture(WGPUTexture* src, uint8_t baseLevel, uint8_t levelCount
     mTexView = makeTextureView(baseLevel, levelCount, target);
 }
 
-wgpu::TextureUsage WGPUTexture::fToWGPUTextureUsage(const TextureUsage& fUsage) {
+wgpu::TextureUsage WGPUTexture::fToWGPUTextureUsage(const TextureUsage& fUsage,
+        const bool supportsTransientAttachment) {
     wgpu::TextureUsage retUsage = wgpu::TextureUsage::None;
 
     // Basing this mapping off of VulkanTexture.cpp's getUsage func and suggestions from Gemini
@@ -592,6 +593,7 @@ wgpu::TextureUsage WGPUTexture::fToWGPUTextureUsage(const TextureUsage& fUsage)
     // This is from Vulkan logic- if there are any issues try disabling this first, allows perf
     // benefit though
     const bool useTransientAttachment =
+            supportsTransientAttachment &&
             // Usage consists of attachment flags only.
             none(fUsage & ~TextureUsage::ALL_ATTACHMENTS) &&
             // Usage contains at least one attachment flag.

filament/backend/src/webgpu/WebGPUHandles.h

@@ -194,7 +194,8 @@ private:
     wgpu::TextureFormat mFormat = wgpu::TextureFormat::Undefined;
     uint32_t mArrayLayerCount = 1;
     wgpu::TextureView mTexView = nullptr;
-    wgpu::TextureUsage fToWGPUTextureUsage(const filament::backend::TextureUsage& fUsage);
+    wgpu::TextureUsage fToWGPUTextureUsage(const filament::backend::TextureUsage& fUsage,
+            const bool supportsTransientAttachment);
 };
 
 struct WGPURenderPrimitive : public HwRenderPrimitive {

filament/backend/src/webgpu/platform/WebGPUPlatform.cpp

@@ -100,9 +100,11 @@ wgpu::Adapter WebGPUPlatform::requestAdapter(wgpu::Surface const& surface) {
 wgpu::Device WebGPUPlatform::requestDevice(wgpu::Adapter const& adapter) {
     // TODO consider passing limits
     constexpr std::array optionalFeatures = { wgpu::FeatureName::DepthClipControl,
-        wgpu::FeatureName::Depth32FloatStencil8, wgpu::FeatureName::CoreFeaturesAndLimits };
+        wgpu::FeatureName::Depth32FloatStencil8, wgpu::FeatureName::CoreFeaturesAndLimits,
+        wgpu::FeatureName::TransientAttachments };
 
-    constexpr std::array requiredFeatures = { wgpu::FeatureName::TransientAttachments };
+    // Currently no required features, but logic to check them is available
+    constexpr std::array<wgpu::FeatureName, 0> requiredFeatures = {};
 
     wgpu::SupportedFeatures supportedFeatures;
     adapter.GetFeatures(&supportedFeatures);