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/*
* Created on Thursday, April 28 2011 22:10
*/
package com.jogamp.opencl.util;
import com.jogamp.opencl.CLContext;
import com.jogamp.opencl.CLDevice;
import com.jogamp.opencl.CLPlatform;
import com.jogamp.opencl.CLResource;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static java.util.Arrays.*;
import static com.jogamp.opencl.CLDevice.Type.*;
/**
* Utility for organizing multiple {@link CLContext}s.
*
* @author Michael Bien
*/
public class CLMultiContext implements CLResource {
private final List<CLContext> contexts;
private CLMultiContext() {
contexts = new ArrayList<CLContext>();
}
/**
* Creates a multi context with all devices of the specified platforms.
*/
public static CLMultiContext create(CLPlatform... platforms) {
return create(platforms, ALL);
}
/**
* Creates a multi context with all devices of the specified platforms and types.
*/
public static CLMultiContext create(CLPlatform[] platforms, CLDevice.Type... types) {
if(platforms == null) {
throw new NullPointerException("platform list was null");
}else if(platforms.length == 0) {
throw new IllegalArgumentException("platform list was empty");
}
List<CLDevice> devices = new ArrayList<CLDevice>();
for (CLPlatform platform : platforms) {
devices.addAll(asList(platform.listCLDevices(types)));
}
return create(devices);
}
/**
* Creates a multi context with the specified devices.
* The devices don't have to be from the same platform.
*/
public static CLMultiContext create(Collection<CLDevice> devices) {
if(devices.isEmpty()) {
throw new IllegalArgumentException("device list was empty");
}
Map<CLPlatform, List<CLDevice>> platformDevicesMap = filterPlatformConflicts(devices);
// create contexts
CLMultiContext mc = new CLMultiContext();
for (Map.Entry<CLPlatform, List<CLDevice>> entry : platformDevicesMap.entrySet()) {
List<CLDevice> list = entry.getValue();
// one context per device to workaround driver bugs
for (CLDevice device : list) {
CLContext context = CLContext.create(device);
mc.contexts.add(context);
}
}
return mc;
}
/**
* Creates a multi context with specified contexts.
*/
public static CLMultiContext wrap(CLContext... contexts) {
CLMultiContext mc = new CLMultiContext();
mc.contexts.addAll(asList(contexts));
return mc;
}
/**
* filter devices; don't allow the same device to be used in more than one platform.
* example: a CPU available via the AMD and Intel SDKs shouldn't end up in two contexts
*/
private static Map<CLPlatform, List<CLDevice>> filterPlatformConflicts(Collection<CLDevice> devices) {
// FIXME: devicename-platform is used as unique device identifier - replace if we have something better
Map<CLPlatform, List<CLDevice>> filtered = new HashMap<CLPlatform, List<CLDevice>>();
Map<String, CLPlatform> used = new HashMap<String, CLPlatform>();
for (CLDevice device : devices) {
String name = device.getName();
CLPlatform platform = device.getPlatform();
CLPlatform usedPlatform = used.get(name);
if(usedPlatform == null || platform.equals(usedPlatform)) {
if(!filtered.containsKey(platform)) {
filtered.put(platform, new ArrayList<CLDevice>());
}
filtered.get(platform).add(device);
used.put(name, platform);
}
}
return filtered;
}
/**
* Releases all contexts.
* @see CLContext#release()
*/
public void release() {
for (CLContext context : contexts) {
context.release();
}
contexts.clear();
}
public List<CLContext> getContexts() {
return Collections.unmodifiableList(contexts);
}
/**
* Returns a list containing all devices used in this multi context.
*/
public List<CLDevice> getDevices() {
List<CLDevice> devices = new ArrayList<CLDevice>();
for (CLContext context : contexts) {
devices.addAll(asList(context.getDevices()));
}
return devices;
}
@Override
public String toString() {
return getClass().getSimpleName()+" [" + contexts.size()+" contexts, "
+ getDevices().size()+ " devices]";
}
}
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