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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
package com.android.ide.eclipse.gltrace.state.transforms;
import com.android.ide.eclipse.gltrace.GLProtoBuf.GLMessage.Function;
import com.android.ide.eclipse.gltrace.state.IGLProperty;
import java.nio.ByteBuffer;
/**
* A {@link BufferSubDataTransform} updates a portion of the buffer data as specified by
* the {@link Function#glBufferSubData} function.
*/
public class BufferSubDataTransform implements IStateTransform {
private final IGLPropertyAccessor mAccessor;
private final int mOffset;
private final byte[] mSubData;
private byte[] mOldData;
private byte[] mNewData;
public BufferSubDataTransform(IGLPropertyAccessor accessor, int offset, byte[] data) {
mAccessor = accessor;
mOffset = offset;
mSubData = data;
}
@Override
public void apply(IGLProperty state) {
IGLProperty property = mAccessor.getProperty(state);
mOldData = (byte[]) property.getValue();
if (mOldData != null) {
mNewData = new byte[mOldData.length];
ByteBuffer bb = ByteBuffer.wrap(mNewData);
// copy all of the old buffer
bb.put(mOldData);
bb.rewind();
// update with the sub buffer data at specified offset
bb.position(mOffset);
bb.put(mSubData);
}
property.setValue(mNewData);
}
@Override
public void revert(IGLProperty state) {
if (mOldData != null) {
IGLProperty property = mAccessor.getProperty(state);
property.setValue(mOldData);
mOldData = null;
}
}
@Override
public IGLProperty getChangedProperty(IGLProperty state) {
return mAccessor.getProperty(state);
}
}
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