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package com.jogamp.opencl;
import com.jogamp.opencl.CLMemory.Mem;
import java.nio.Buffer;
/**
* A sub buffer of a CLBuffer.
* @author Michael Bien
*/
public class CLSubBuffer<B extends Buffer> extends CLBuffer<B> {
private CLBuffer<B> parent;
private final int offset;
CLSubBuffer(CLBuffer<B> parent, int origin, int size, B directBuffer, long id, int flags) {
super(parent.getContext(), directBuffer, size, id, flags);
this.parent = parent;
this.offset = origin;
}
/**
* Throws an UnsupportedOperationException since creating sub buffers
* from sub buffers is not allowed as of OpenCL 1.1.
*/
@Override
public CLSubBuffer<B> createSubBuffer(int origin, int size, Mem... flags) {
throw new UnsupportedOperationException("creating sub buffers from sub buffers is not allowed.");
}
@Override
public void release() {
parent.onReleaseSubBuffer(this);
super.release();
}
/**
* Returns the parent buffer this buffer was created from.
*/
public CLBuffer<B> getParent() {
return parent;
}
/**
* Returns the offset of this sub buffer to its parent in buffer elements.
*/
public int getOffset() {
int elemSize = buffer==null ? 1 : sizeOfBufferElem(buffer);
return offset/elemSize;
}
/**
* Returns the offset of this sub buffer to its parent in bytes.
*/
public int getCLOffset() {
return offset;
}
/**
* Returns true.
*/
@Override
public boolean isSubBuffer() {
return true;
}
}
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