Potential fix to support denoising on differently mixed devices.

src/GafferCycles/IECoreCyclesPreview/Renderer.cpp

@@ -4165,6 +4165,20 @@ class CyclesRenderer final : public IECoreScenePreview::Renderer
 				m_sessionParams.device = device_fallback;
 			}
 
+			if( m_sessionParams.denoising.use )
+			{
+				/* Add additional denoising devices if we are rendering and denoising
+				* with different devices. */
+				m_sessionParams.device.add_denoising_devices( m_sessionParams.denoising.type );
+
+				/* Check if denoiser is supported by device. */
+				if( !( m_sessionParams.device.denoisers & m_sessionParams.denoising.type ) )
+				{
+					IECore::msg( IECore::Msg::Warning, "CyclesRenderer", "Chosen denoising is not compatible with device." );
+					m_sessionParams.denoising.use = false;
+				}
+			}
+
 			if( m_session )
 			{
 				// A trick to retain the same pointer when re-creating a session.

src/GafferCyclesModule/GafferCyclesModule.cpp

@@ -82,13 +82,15 @@ static py::list getDevices()
 		d["id"] = device.id;
 		d["num"] = device.num;
 		d["display_device"] = device.display_device;
-		//d["advanced_shading"] = device.advanced_shading;
 		d["has_half_images"] = device.has_half_images;
 		d["has_volume_decoupled"] = device.has_volume_decoupled;
+		d["has_adaptive_stop_per_sample"] = device.has_adaptive_stop_per_sample;
 		d["has_osl"] = device.has_osl;
 		d["use_split_kernel"] = device.use_split_kernel;
 		d["has_profiling"] = device.has_profiling;
 		d["cpu_threads"] = device.cpu_threads;
+		d["has_peer_memory"] = device.has_peer_memory;
+		d["denoisers"] = device.denoisers;
 
 		if( device.type == ccl::DEVICE_OPTIX )
 			py::scope().attr( "hasOptixDenoise" ) = true;