Added TileLayout utilities

ScriptableRenderPipeline/Core/CoreRP/RectInt.cs

+namespace UnityEngine.Experimental.Rendering
+{
+    public struct RectInt 
+    {
+        public static readonly RectInt zero = new RectInt(0, 0, 0, 0);
+
+        public int x;
+        public int y;
+        public int width;
+        public int height;
+
+        public RectInt(int x, int y, int width, int height)
+        {
+            this.x = x;
+            this.y = y;
+            this.width = width;
+            this.height = height;
+        }
+    }
+}

ScriptableRenderPipeline/Core/CoreRP/RectInt.cs.meta

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ScriptableRenderPipeline/Core/CoreRP/TileLayoutUtils.cs

+namespace UnityEngine.Experimental.Rendering
+{
+    public static class TileLayoutUtils
+    {
+        public static bool TryLayoutByTiles(
+            RectInt src, 
+            uint tileSize, 
+            out RectInt main, 
+            out RectInt topRow, 
+            out RectInt rightCol, 
+            out RectInt topRight)
+        {
+            if (src.width < tileSize || src.height < tileSize)
+            {
+                main = RectInt.zero;
+                topRow = RectInt.zero;
+                rightCol = RectInt.zero;
+                topRight = RectInt.zero;
+                return false;
+            }
+
+            int mainRows = src.height / (int)tileSize;
+            int mainCols = src.width / (int)tileSize;
+            int mainWidth = mainCols * (int)tileSize;
+            int mainHeight = mainRows * (int)tileSize;
+
+            main = new RectInt
+            {
+                x = src.x,
+                y = src.y,
+                width = mainWidth,
+                height = mainHeight,
+            };
+            topRow = new RectInt
+            {
+                x = src.x,
+                y = src.y + mainHeight,
+                width = mainWidth,
+                height = src.height - mainHeight
+            };
+            rightCol = new RectInt
+            {
+                x = src.x + mainWidth,
+                y = src.y,
+                width = src.width - mainWidth,
+                height = mainHeight
+            };
+            topRight = new RectInt
+            {
+                x = src.x + mainWidth,
+                y = src.y + mainHeight,
+                width = src.width - mainWidth,
+                height = src.height - mainHeight
+            };
+
+            return true;
+        }
+
+        public static bool TryLayoutByRow(
+            RectInt src, 
+            uint tileSize, 
+            out RectInt main, 
+            out RectInt other)
+        {
+            if (src.height < tileSize)
+            {
+                main = RectInt.zero;
+                other = RectInt.zero;
+                return false;
+            }
+
+            int mainRows = src.height / (int)tileSize;
+            int mainHeight = mainRows * (int)tileSize;
+
+            main = new RectInt
+            {
+                x = src.x,
+                y = src.y,
+                width = src.width,
+                height = mainHeight,
+            };
+            other = new RectInt
+            {
+                x = src.x,
+                y = src.y + mainHeight,
+                width = src.width,
+                height = src.height - mainHeight
+            };
+
+            return true;
+        }
+
+        public static bool TryLayoutByCol(
+            RectInt src, 
+            uint tileSize, 
+            out RectInt main, 
+            out RectInt other)
+        {
+            if (src.width < tileSize)
+            {
+                main = RectInt.zero;
+                other = RectInt.zero;
+                return false;
+            }
+
+            int mainCols = src.width / (int)tileSize;
+            int mainWidth = mainCols * (int)tileSize;
+
+            main = new RectInt
+            {
+                x = src.x,
+                y = src.y,
+                width = mainWidth,
+                height = src.height,
+            };
+            other = new RectInt
+            {
+                x = src.x + mainWidth,
+                y = src.y,
+                width = src.width - mainWidth,
+                height = src.height
+            };
+
+            return true;
+        }
+    }
+}

ScriptableRenderPipeline/Core/CoreRP/TileLayoutUtils.cs.meta

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