[engine] Spine 组件多纹理渲染、动态图集、与其它组件合批、region 换装

engine/cocos2d/core/renderer/webgl/mesh-buffer.js

@@ -191,6 +191,52 @@ let MeshBuffer = cc.Class({
         this.requestStatic(vertexCount, indiceCount);
         return this._offsetInfo;
     },
+
+    requestForSpine(vertexCount, indiceCount) {
+        if (this._batcher._buffer !== this) {
+            this._batcher._flush();
+            this._batcher._buffer = this;
+        }
+
+        this.requestStaticForSpine(vertexCount, indiceCount);
+        return this._offsetInfo;
+    },
+
+    requestStaticForSpine(vertexCount, indiceCount) {
+
+        this.checkAndSwitchBuffer(vertexCount);
+
+        let byteOffset = this.byteOffset + vertexCount * this._vertexBytes;
+        let indiceOffset = this.indiceOffset + indiceCount;
+
+        let byteLength = this._vData.byteLength;
+        let indiceLength = this._iData.length;
+        if (byteOffset > byteLength || indiceOffset > indiceLength) {
+            while (byteLength < byteOffset || indiceLength < indiceOffset) {
+                this._initVDataCount *= 2;
+                this._initIDataCount *= 2;
+
+                byteLength = this._initVDataCount * 4;
+                indiceLength = this._initIDataCount;
+            }
+
+            this._reallocBuffer();
+        }
+
+        let offsetInfo = this._offsetInfo;
+        offsetInfo.vertexOffset = this.vertexOffset;
+        offsetInfo.indiceOffset = this.indiceOffset;
+        offsetInfo.byteOffset = this.byteOffset;
+    },
+
+    adjustForSpine(vertexCount, indiceCount) {
+        this.vertexOffset += vertexCount;
+        this.indiceOffset += indiceCount;
+
+        this.byteOffset = this.byteOffset + vertexCount * this._vertexBytes;
+
+        this._dirty = true;
+    },
     
     _reallocBuffer () {
         this._reallocVData(true);