1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ide.eclipse.gltrace.state.transforms; 18 19 import com.android.ide.eclipse.gltrace.GLProtoBuf.GLMessage.Function; 20 import com.android.ide.eclipse.gltrace.state.IGLProperty; 21 22 import java.nio.ByteBuffer; 23 24 /** 25 * A {@link BufferSubDataTransform} updates a portion of the buffer data as specified by 26 * the {@link Function#glBufferSubData} function. 27 */ 28 public class BufferSubDataTransform implements IStateTransform { 29 private final IGLPropertyAccessor mAccessor; 30 private final int mOffset; 31 32 private final byte[] mSubData; 33 private byte[] mOldData; 34 private byte[] mNewData; 35 36 public BufferSubDataTransform(IGLPropertyAccessor accessor, int offset, byte[] data) { 37 mAccessor = accessor; 38 mOffset = offset; 39 mSubData = data; 40 } 41 42 @Override 43 public void apply(IGLProperty state) { 44 IGLProperty property = mAccessor.getProperty(state); 45 mOldData = (byte[]) property.getValue(); 46 47 if (mOldData != null) { 48 mNewData = new byte[mOldData.length]; 49 ByteBuffer bb = ByteBuffer.wrap(mNewData); 50 51 // copy all of the old buffer 52 bb.put(mOldData); 53 bb.rewind(); 54 55 // update with the sub buffer data at specified offset 56 bb.position(mOffset); 57 bb.put(mSubData); 58 } 59 60 property.setValue(mNewData); 61 } 62 63 @Override 64 public void revert(IGLProperty state) { 65 if (mOldData != null) { 66 IGLProperty property = mAccessor.getProperty(state); 67 property.setValue(mOldData); 68 mOldData = null; 69 } 70 } 71 72 @Override 73 public IGLProperty getChangedProperty(IGLProperty state) { 74 return mAccessor.getProperty(state); 75 } 76 } 77
