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diff --git a/intern/cycles/device/device_denoise.h b/intern/cycles/device/device_denoise.h
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+++ b/intern/cycles/device/device_denoise.h
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+/*
+ * Copyright 2011-2013 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "device/device_memory.h"
+#include "graph/node.h"
+#include "render/buffers.h"
+
+CCL_NAMESPACE_BEGIN
+
+enum DenoiserType {
+  DENOISER_OPTIX = 2,
+  DENOISER_OPENIMAGEDENOISE = 4,
+  DENOISER_NUM,
+
+  DENOISER_NONE = 0,
+  DENOISER_ALL = ~0,
+};
+
+/* COnstruct human-readable string which denotes the denoiser type. */
+const char *denoiserTypeToHumanReadable(DenoiserType type);
+
+typedef int DenoiserTypeMask;
+
+enum DenoiserPrefilter {
+  /* Best quality of the result without extra processing time, but requires guiding passes to be
+   * noise-free. */
+  DENOISER_PREFILTER_NONE = 1,
+
+  /* Denoise color and guiding passes together.
+   * Improves quality when guiding passes are noisy using least amount of extra processing time. */
+  DENOISER_PREFILTER_FAST = 2,
+
+  /* Prefilter noisy guiding passes before denoising color.
+   * Improves quality when guiding passes are noisy using extra processing time. */
+  DENOISER_PREFILTER_ACCURATE = 3,
+
+  DENOISER_PREFILTER_NUM,
+};
+
+/* NOTE: Is not a real scene node. Using Node API for ease of (de)serialization.
+ * The default values here do not really matter as they are always initialized from the
+ * Integrator node. */
+class DenoiseParams : public Node {
+ public:
+  NODE_DECLARE
+
+  /* Apply denoiser to image. */
+  bool use = false;
+
+  /* Denoiser type. */
+  DenoiserType type = DENOISER_OPENIMAGEDENOISE;
+
+  /* Viewport start sample. */
+  int start_sample = 0;
+
+  /* Auxiliary passes. */
+  bool use_pass_albedo = true;
+  bool use_pass_normal = true;
+
+  DenoiserPrefilter prefilter = DENOISER_PREFILTER_FAST;
+
+  static const NodeEnum *get_type_enum();
+  static const NodeEnum *get_prefilter_enum();
+
+  DenoiseParams();
+
+  bool modified(const DenoiseParams &other) const
+  {
+    return !(use == other.use && type == other.type && start_sample == other.start_sample &&
+             use_pass_albedo == other.use_pass_albedo &&
+             use_pass_normal == other.use_pass_normal && prefilter == other.prefilter);
+  }
+};
+
+/* All the parameters needed to perform buffer denoising on a device.
+ * Is not really a task in its canonical terms (as in, is not an asynchronous running task). Is
+ * more like a wrapper for all the arguments and parameters needed to perform denoising. Is a
+ * single place where they are all listed, so that it's not required to modify all device methods
+ * when these parameters do change. */
+class DeviceDenoiseTask {
+ public:
+  DenoiseParams params;
+
+  int num_samples;
+
+  RenderBuffers *render_buffers;
+  BufferParams buffer_params;
+
+  /* Allow to do in-place modification of the input passes (scaling them down i.e.). This will
+   * lower the memory footprint of the denoiser but will make input passes "invalid" (from path
+   * tracer) point of view. */
+  bool allow_inplace_modification;
+};
+
+CCL_NAMESPACE_END