Add some external dependencies.

extern/EtcLib/EtcCodec/EtcSortedBlockList.h

@@ -0,0 +1,124 @@
+/*
+ * Copyright 2015 The Etc2Comp Authors.
+ *
+ * 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
+
+namespace Etc
+{
+	class Block4x4;
+
+    class SortedBlockList
+    {
+    public:
+
+		class Link
+		{
+		public:
+
+			inline void Init(Block4x4 *a_pblock)
+			{
+				m_pblock = a_pblock;
+				m_plinkNext = nullptr;
+			}
+
+			inline Block4x4 * GetBlock(void)
+			{
+				return m_pblock;
+			}
+
+			inline void SetNext(Link *a_plinkNext)
+			{
+				m_plinkNext = a_plinkNext;
+			}
+
+			inline Link * GetNext(void)
+			{
+				return m_plinkNext;
+			}
+
+			inline Link * Advance(unsigned int a_uiSteps = 1)
+			{
+				Link *plink = this;
+
+				for (unsigned int uiStep = 0; uiStep < a_uiSteps; uiStep++)
+				{
+					if (plink == nullptr)
+					{
+						break;
+					}
+
+					plink = plink->m_plinkNext;
+				}
+
+				return plink;
+			}
+
+		private:
+
+			Block4x4 *m_pblock;
+			Link *m_plinkNext;
+		};
+
+		SortedBlockList(unsigned int a_uiImageBlocks, unsigned int a_uiBuckets);
+		~SortedBlockList(void);
+
+        void AddBlock(Block4x4 *a_pblock);
+
+        void Sort(void);
+
+		inline Link * GetLinkToFirstBlock(void)
+		{
+			return m_plinkFirst;
+		}
+
+		inline unsigned int GetNumberOfAddedBlocks(void)
+		{
+			return m_uiAddedBlocks;
+		}
+
+		inline unsigned int GetNumberOfSortedBlocks(void)
+		{
+			return m_uiSortedBlocks;
+		}
+
+		void Print(void);
+
+	private:
+
+        void InitBuckets(void);
+
+        class Bucket
+        {
+        public:
+            Link *plinkFirst;
+            Link *plinkLast;
+        };
+
+        unsigned int m_uiImageBlocks;
+        int m_iBuckets;
+
+		unsigned int m_uiAddedBlocks;
+		unsigned int m_uiSortedBlocks;
+		Link *m_palinkPool;
+        Bucket *m_pabucket;
+        float m_fMaxError;
+
+		Link *m_plinkFirst;
+		Link *m_plinkLast;
+
+    };
+
+} // namespace Etc