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package com.mbien.opencl;
import com.sun.gluegen.runtime.BufferFactory;
import com.sun.gluegen.runtime.CPU;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import static com.mbien.opencl.CLException.*;
/**
* High level abstraction for an OpenCL Kernel.
* "A kernel is a function declared in a program. A kernel is identified by the __kernel qualifier
* applied to any function in a program. A kernel object encapsulates the specific __kernel
* function declared in a program and the argument values to be used when executing this
* __kernel function."
* @author Michael Bien
*/
public class CLKernel implements CLResource {
public final long ID;
public final String name;
public final int numArgs;
private final CLProgram program;
private final CL cl;
CLKernel(CLProgram program, long id) {
this.ID = id;
this.program = program;
this.cl = program.context.cl;
long[] longArray = new long[1];
// get function name
int ret = cl.clGetKernelInfo(ID, CL.CL_KERNEL_FUNCTION_NAME, 0, null, longArray, 0);
checkForError(ret, "error while asking for kernel function name");
ByteBuffer bb = ByteBuffer.allocate((int)longArray[0]).order(ByteOrder.nativeOrder());
ret = cl.clGetKernelInfo(ID, CL.CL_KERNEL_FUNCTION_NAME, bb.capacity(), bb, null, 0);
checkForError(ret, "error while asking for kernel function name");
this.name = new String(bb.array(), 0, bb.capacity()).trim();
// get number of arguments
ret = cl.clGetKernelInfo(ID, CL.CL_KERNEL_NUM_ARGS, 0, null, longArray, 0);
checkForError(ret, "error while asking for number of function arguments.");
numArgs = (int)longArray[0];
}
public CLKernel setArg(int argumentIndex, CLBuffer<?> value) {
setArgument(argumentIndex, CPU.is32Bit()?4:8, wrap(value.ID));
return this;
}
public CLKernel setArg(int argumentIndex, int value) {
setArgument(argumentIndex, 4, wrap(value));
return this;
}
public CLKernel setArg(int argumentIndex, long value) {
setArgument(argumentIndex, 8, wrap(value));
return this;
}
public CLKernel setArg(int argumentIndex, float value) {
setArgument(argumentIndex, 4, wrap(value));
return this;
}
public CLKernel setArg(int argumentIndex, double value) {
setArgument(argumentIndex, 8, wrap(value));
return this;
}
private final void setArgument(int argumentIndex, int size, Buffer value) {
if(argumentIndex >= numArgs || argumentIndex < 0) {
throw new IndexOutOfBoundsException("kernel "+ toString() +" has "+numArgs+
" arguments, can not set argument number "+argumentIndex);
}
if(!program.isExecutable()) {
throw new IllegalStateException("can not set program" +
" arguments for a not excecutable program. "+program);
}
int ret = cl.clSetKernelArg(ID, argumentIndex, size, value);
checkForError(ret, "error on clSetKernelArg");
}
private final Buffer wrap(float value) {
return BufferFactory.newDirectByteBuffer(4).putFloat(value).rewind();
}
private final Buffer wrap(double value) {
return BufferFactory.newDirectByteBuffer(8).putDouble(value).rewind();
}
private final Buffer wrap(int value) {
return BufferFactory.newDirectByteBuffer(4).putInt(value).rewind();
}
private final Buffer wrap(long value) {
return BufferFactory.newDirectByteBuffer(8).putLong(value).rewind();
}
/**
* Releases all resources of this kernel from its context.
*/
public void release() {
int ret = cl.clReleaseKernel(ID);
program.onKernelReleased(this);
checkForError(ret, "can not release kernel");
}
@Override
public String toString() {
return "CLKernel [id: " + ID
+ " name: " + name+"]";
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final CLKernel other = (CLKernel) obj;
if (this.ID != other.ID) {
return false;
}
if (!this.program.equals(other.program)) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 43 * hash + (int) (this.ID ^ (this.ID >>> 32));
hash = 43 * hash + (this.program != null ? this.program.hashCode() : 0);
return hash;
}
}
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