private void begin(Writer writer, IndWriter indexer, int mode, int blockSize) { mDraw.checkErr(); mActiveWriter = writer; mActiveIndexer = indexer; mActiveMode = mode; mVertBuf.clear(); int bytes = mVertBuf.capacity(); int vertBytes = writer.mVertWriter.bytesPerElem(); mActiveCap = (bytes / (vertBytes * blockSize)) * blockSize; mActivePos = 0; writer.mProgram.bind(mDraw); writer.mVao.bind(mDraw); mVbo.bind(mDraw); if (indexer != null) { indexer.reset(); mIndBuf.clear(); mIbo.bind(mDraw); } DrawUtil.checkErr(); }