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package com.mbien.opencl;
import com.mbien.opencl.impl.CLImpl;
import java.nio.IntBuffer;
/**
*
* @author Michael Bien
*/
public final class CLContext {
private final static CL cl;
public final long contextID;
static{
System.loadLibrary("gluegen-rt");
System.loadLibrary("jocl");
cl = new CLImpl();
}
private CLContext(long contextID) {
this.contextID = contextID;
}
/**
* Creates a default context on all available devices.
*/
public static CLContext create() {
IntBuffer ib = IntBuffer.allocate(1);
long context = cl.clCreateContextFromType(null, 0, CL.CL_DEVICE_TYPE_ALL, null, null, null, 0);
// int errorCode = ib.get();
// if(errorCode != CL.CL_SUCCESS)
// throw new CLException(errorCode, "can not create CL context");
return new CLContext(context);
}
/**
* Creates a default context on the specified device types.
*/
public static CLContext create(CLDevice.Type... deviceTypes) {
int type = deviceTypes[0].CL_TYPE;
for (int i = 1; i < deviceTypes.length; i++) {
type |= deviceTypes[i].CL_TYPE;
}
long ctxID = cl.clCreateContextFromType(null, 0, type, null, null, null, 0);
return new CLContext(ctxID);
}
/**
* Releases the context and all resources.
*/
public void release() {
int ret = cl.clReleaseContext(contextID);
if(CL.CL_SUCCESS != ret)
throw new CLException(ret, "error releasing context");
}
/**
* Gets the device with maximal FLOPS from this context.
*/
public CLDevice getMaxFlopsDevice() {
//TODO not finished
long[] longBuffer = new long[1];
// ByteBuffer bb = ByteBuffer.allocate(8);
// bb.order(ByteOrder.nativeOrder());
int ret = cl.clGetContextInfo(contextID, CL.CL_CONTEXT_DEVICES, 0, null, longBuffer, 0);
if(CL.CL_SUCCESS != ret)
throw new CLException(ret, "can not receive context info");
System.out.println("#devices: "+longBuffer[0]);
long[] deviceIDs = new long[(int)longBuffer[0]];
ret = cl.clGetContextInfo(contextID, CL.CL_CONTEXT_DEVICES, 0, null, deviceIDs, 0);
if(CL.CL_SUCCESS != ret)
throw new CLException(ret, "can not receive context info");
for (int i = 0; i < deviceIDs.length; i++) {
long l = deviceIDs[i];
System.out.println("device id"+l);
}
// get the list of GPU devices associated with context
// ciErrNum = clGetContextInfo(cxGPUContext, CL_CONTEXT_DEVICES, 0, NULL, &dataBytes);
// cl_device_id *cdDevices = (cl_device_id *)malloc(dataBytes);
// ciErrNum |= clGetContextInfo(cxGPUContext, CL_CONTEXT_DEVICES, dataBytes, cdDevices, NULL);
// shrCheckError(ciErrNum, CL_SUCCESS);
return null;
}
/**
* Lists all available OpenCL implementaitons.
* @throws CLException if something went wrong initializing OpenCL
*/
public static CLPlatform[] listCLPlatforms() {
int[] intBuffer = new int[1];
// find all available OpenCL platforms
int ret = cl.clGetPlatformIDs(0, null, 0, intBuffer, 0);
if(CL.CL_SUCCESS != ret)
throw new CLException(ret, "can not enumerate platforms");
// receive platform ids
long[] platformId = new long[intBuffer[0]];
ret = cl.clGetPlatformIDs(platformId.length, platformId, 0, null, 0);
if(CL.CL_SUCCESS != ret)
throw new CLException(ret, "can not enumerate platforms");
CLPlatform[] platforms = new CLPlatform[platformId.length];
for (int i = 0; i < platformId.length; i++)
platforms[i] = new CLPlatform(cl, platformId[i]);
return platforms;
}
/**
* Returns the low level binding interface to the OpenCL APIs.
*/
public static CL getLowLevelBinding() {
return cl;
}
}
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