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package com.mbien.opencl;
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.
* @author Michael Bien
*/
abstract class CLInfoAccessor {
private final static ByteBuffer buffer;
private final static long[] longBuffer;
// TODO revisit for command queue concurrency
// TODO use direct memory code path as soon gluegen is fixed
static{
buffer = ByteBuffer.allocate(512);
buffer.order(ByteOrder.nativeOrder());
longBuffer = new long[1];
}
public CLInfoAccessor() {
}
final long getLong(int key) {
buffer.rewind();
int ret = getInfo(key, 8, buffer, null, 0);
checkForError(ret, "error while asking for info value");
return buffer.getLong();
}
final String getString(int key) {
buffer.rewind();
int ret = getInfo(key, buffer.capacity(), buffer, longBuffer, 0);
checkForError(ret, "error while asking for info string");
return CLUtils.clString2JavaString(buffer.array(), (int)longBuffer[0]);
}
protected abstract int getInfo(int name, long valueSize, Buffer value, long[] valueSizeRet, int valueSizeRetOffset);
}
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