新增hash

source/src/Utils/Extensions/WebGLUtils.ts

@@ -1,9 +0,0 @@
-class WebGLUtils {
-    /**
-     * 获取webgl context
-     */
-    public static getContext() {
-        const canvas = document.getElementsByTagName('canvas')[0];
-        return canvas.getContext('2d');
-    }
-}

source/src/Utils/Hash.ts

@@ -0,0 +1,22 @@
+module es {
+    export class Hash {
+        /**
+         * 从一个字节数组中计算一个哈希值
+         * @param data 
+         */
+        public static computeHash(...data: number[]) {
+            const p: number = 16777619;
+            let hash = 2166136261;
+
+            for (let i = 0; i < data.length; i++)
+                hash = (hash ^ data[i]) * p;
+
+            hash += hash << 13;
+            hash ^= hash >> 7;
+            hash += hash << 3;
+            hash ^= hash >> 17;
+            hash += hash << 5;
+            return hash;
+        }
+    }
+}