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package com.mbien.opencl;
import com.mbien.opencl.impl.CLImpl;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import static com.mbien.opencl.CLException.*;
/**
*
* @author Michael Bien
*/
public final class CLContext {
final static CL cl;
public final long contextID;
private CLDevice[] devices;
private final List<CLProgram> programs;
static{
System.loadLibrary("gluegen-rt");
System.loadLibrary("jocl");
cl = new CLImpl();
}
private CLContext(long contextID) {
this.contextID = contextID;
this.programs = new ArrayList<CLProgram>();
}
/**
* Creates a default context on all available devices.
*/
public static final CLContext create() {
return createContext(CL.CL_DEVICE_TYPE_ALL);
}
/**
* Creates a default context on the specified device types.
*/
public static final CLContext create(CLDevice.Type... deviceTypes) {
int type = deviceTypes[0].CL_TYPE;
for (int i = 1; i < deviceTypes.length; i++) {
type |= deviceTypes[i].CL_TYPE;
}
return createContext(type);
}
private static final CLContext createContext(long deviceType) {
IntBuffer error = IntBuffer.allocate(1);
long context = cl.clCreateContextFromType(null, 0, deviceType, null, null, error, 0);
checkForError(error.get(), "can not create CL context");
return new CLContext(context);
}
public CLProgram createProgram(String src) {
CLProgram program = new CLProgram(this, src, contextID);
programs.add(program);
return program;
}
void programReleased(CLProgram program) {
programs.remove(program);
}
/**
* Releases the context and all resources.
*/
public CLContext release() {
int ret = cl.clReleaseContext(contextID);
checkForError(ret, "error releasing context");
return this;
}
/**
* Returns a read only view of all programs associated with this context.
*/
public List<CLProgram> getPrograms() {
return Collections.unmodifiableList(programs);
}
/**
* Gets the device with maximal FLOPS from this context.
*/
/*
public CLDevice getMaxFlopsDevice() {
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;
}
*/
/**
* Returns all devices associated with this CLContext.
*/
public CLDevice[] getCLDevices() {
if(devices == null) {
int sizeofDeviceID = 8; // TODO doublechek deviceID size on 32 bit systems
long[] longBuffer = new long[1];
int ret;
ret = cl.clGetContextInfo(contextID, CL.CL_CONTEXT_DEVICES, 0, null, longBuffer, 0);
checkForError(ret, "can not enumerate devices");
ByteBuffer deviceIDs = ByteBuffer.allocate((int)longBuffer[0]).order(ByteOrder.nativeOrder());
ret = cl.clGetContextInfo(contextID, CL.CL_CONTEXT_DEVICES, deviceIDs.capacity(), deviceIDs, null, 0);
checkForError(ret, "can not enumerate devices");
devices = new CLDevice[deviceIDs.capacity()/sizeofDeviceID];
for (int i = 0; i < devices.length; i++)
devices[i] = new CLDevice(cl, deviceIDs.getLong()); // TODO doublechek deviceID size on 32 bit systems
}
return devices;
}
CLDevice getCLDevices(long dID) {
CLDevice[] deviceArray = getCLDevices();
for (int i = 0; i < deviceArray.length; i++) {
if(dID == deviceArray[i].deviceID)
return deviceArray[i];
}
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);
checkForError(ret, "can not enumerate platforms");
// receive platform ids
long[] platformId = new long[intBuffer[0]];
ret = cl.clGetPlatformIDs(platformId.length, platformId, 0, null, 0);
checkForError(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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