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package com.mbien.opencl;
import com.sun.gluegen.runtime.PointerBuffer;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import static com.mbien.opencl.CLException.*;
/**
* Internal utility for common OpenCL clGetFooInfo calls.
* Threadsafe.
* @author Michael Bien
*/
abstract class CLInfoAccessor {
private final static ThreadLocal<ByteBuffer> localBB = new ThreadLocal<ByteBuffer>() {
@Override
protected ByteBuffer initialValue() {
return ByteBuffer.allocateDirect(512).order(ByteOrder.nativeOrder());
}
};
private final static ThreadLocal<PointerBuffer> localPB = new ThreadLocal<PointerBuffer>() {
@Override
protected PointerBuffer initialValue() {
return PointerBuffer.allocateDirect(1);
}
};
final long getLong(int key) {
ByteBuffer buffer = localBB.get();
int ret = getInfo(key, 8, buffer, null);
checkForError(ret, "error while asking for info value");
return buffer.getLong(0);
}
final String getString(int key) {
ByteBuffer buffer = localBB.get();
PointerBuffer pbuffer = localPB.get();
int ret = getInfo(key, buffer.capacity(), buffer, pbuffer);
checkForError(ret, "error while asking for info string");
int clSize = (int)pbuffer.get(0);
byte[] array = new byte[clSize-1]; // last char is always null
buffer.get(array).rewind();
return CLUtils.clString2JavaString(array, clSize);
}
protected abstract int getInfo(int name, long valueSize, Buffer value, PointerBuffer valueSizeRet);
}
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