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Source/Engine/ShadowsOfMordor/AtlasChartsPacker.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Builder.h"
+#include "Engine/Utilities/RectPack.h"
+
+#if COMPILE_WITH_GI_BAKING
+
+namespace ShadowsOfMordor
+{
+    class AtlasChartsPacker
+    {
+    public:
+
+        struct Node : RectPack<Node>
+        {
+            Builder::LightmapUVsChart* Chart = nullptr;
+
+            Node(uint32 x, uint32 y, uint32 width, uint32 height)
+                : RectPack<Node>(x, y, width, height)
+            {
+            }
+
+            void OnInsert(Builder::LightmapUVsChart* chart, const LightmapSettings* settings)
+            {
+                Chart = chart;
+                const float invSize = 1.0f / (int32)settings->AtlasSize;
+                chart->Result.UVsArea = Rectangle(X * invSize, Y * invSize, chart->Width * invSize, chart->Height * invSize);
+            }
+        };
+
+    private:
+
+        Node _root;
+        const LightmapSettings* _settings;
+
+    public:
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AtlasChartsPacker"/> class.
+        /// </summary>
+        /// <param name="settings">The settings.</param>
+        AtlasChartsPacker(const LightmapSettings* settings)
+            : _root(settings->ChartsPadding, settings->ChartsPadding, (int32)settings->AtlasSize - settings->ChartsPadding, (int32)settings->AtlasSize - settings->ChartsPadding)
+            , _settings(settings)
+        {
+        }
+
+        /// <summary>
+        /// Finalizes an instance of the <see cref="AtlasChartsPacker"/> class.
+        /// </summary>
+        ~AtlasChartsPacker()
+        {
+        }
+
+    public:
+
+        /// <summary>
+        /// Inserts the specified chart into atlas .
+        /// </summary>
+        /// <param name="chart">The chart.</param>
+        /// <returns></returns>
+        Node* Insert(Builder::LightmapUVsChart* chart)
+        {
+            return _root.Insert(chart->Width, chart->Height, _settings->ChartsPadding, chart, _settings);
+        }
+    };
+};
+
+#endif