1 files changed, 56 insertions, 0 deletions
diff --git a/intern/cycles/integrator/tile.h b/intern/cycles/integrator/tile.h
new file mode 100644
index 00000000000..d0824843ddb
--- /dev/null
+++ b/intern/cycles/integrator/tile.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2011-2021 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 <ostream>
+
+#include "util/util_types.h"
+
+CCL_NAMESPACE_BEGIN
+
+struct TileSize {
+  TileSize() = default;
+
+  inline TileSize(int width, int height, int num_samples)
+      : width(width), height(height), num_samples(num_samples)
+  {
+  }
+
+  inline bool operator==(const TileSize &other) const
+  {
+    return width == other.width && height == other.height && num_samples == other.num_samples;
+  }
+  inline bool operator!=(const TileSize &other) const
+  {
+    return !(*this == other);
+  }
+
+  int width = 0, height = 0;
+  int num_samples = 0;
+};
+
+std::ostream &operator<<(std::ostream &os, const TileSize &tile_size);
+
+/* Calculate tile size which is best suitable for rendering image of a given size with given number
+ * of active path states.
+ * Will attempt to provide best guess to keep path tracing threads of a device as localized as
+ * possible, and have as many threads active for every tile as possible. */
+TileSize tile_calculate_best_size(const int2 &image_size,
+                                  const int num_samples,
+                                  const int max_num_path_states);
+
+CCL_NAMESPACE_END