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package com.mbien.opencl;
import com.mbien.opencl.impl.CLImpl;
import java.nio.ByteBuffer;
import static com.mbien.opencl.CLException.*;
/**
*
* @author Michael Bien
*/
public final class CLPlatform {
/**
* OpenCL platform id for this platform.
*/
public final long ID;
private static final CL cl;
static{
System.loadLibrary("gluegen-rt");
System.loadLibrary("jocl");
cl = new CLImpl();
}
CLPlatform(long id) {
this.ID = id;
}
/**
* 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(platformId[i]);
return platforms;
}
/**
* Returns the low level binding interface to the OpenCL APIs.
*/
public static CL getLowLevelBinding() {
return cl;
}
/**
* Lists all physical devices available on this platform.
*/
public CLDevice[] listCLDevices() {
int[] intBuffer = new int[1];
//find all devices
int ret = cl.clGetDeviceIDs(ID, CL.CL_DEVICE_TYPE_ALL, 0, null, 0, intBuffer, 0);
checkForError(ret, "error while enumerating devices");
long[] deviceIDs = new long[intBuffer[0]];
ret = cl.clGetDeviceIDs(ID, CL.CL_DEVICE_TYPE_ALL, deviceIDs.length, deviceIDs, 0, null, 0);
checkForError(ret, "error while enumerating devices");
CLDevice[] devices = new CLDevice[deviceIDs.length];
//print device info
for (int i = 0; i < deviceIDs.length; i++)
devices[i] = new CLDevice(cl, deviceIDs[i]);
return devices;
}
static final CLDevice findMaxFlopsDevice(CLDevice[] devices) {
CLDevice maxFLOPSDevice = null;
int maxflops = -1;
for (int i = 0; i < devices.length; i++) {
CLDevice device = devices[i];
int maxComputeUnits = device.getMaxComputeUnits();
int maxClockFrequency = device.getMaxClockFrequency();
int flops = maxComputeUnits*maxClockFrequency;
if(flops > maxflops) {
maxflops = flops;
maxFLOPSDevice = device;
}
}
return maxFLOPSDevice;
}
/**
* Gets the device with maximal FLOPS from this platform.
* The device speed is estimated by calulating the product of
* MAX_COMPUTE_UNITS and MAX_CLOCK_FREQUENCY.
*/
public CLDevice getMaxFlopsDevice() {
return findMaxFlopsDevice(listCLDevices());
}
/**
* Returns the platform name.
*/
public String getName() {
return getInfoString(CL.CL_PLATFORM_NAME);
}
/**
* Returns the platform version.
*/
public String getVersion() {
return getInfoString(CL.CL_PLATFORM_VERSION);
}
/**
* Returns the platform profile.
*/
public String getProfile() {
return getInfoString(CL.CL_PLATFORM_PROFILE);
}
/**
* Returns the platform vendor.
*/
public String getVendor() {
return getInfoString(CL.CL_PLATFORM_VENDOR);
}
/**
* Returns a info string in exchange for a key (CL_PLATFORM_*).
*/
public String getInfoString(int key) {
long[] longBuffer = new long[1];
ByteBuffer bb = ByteBuffer.allocate(512);
int ret = cl.clGetPlatformInfo(ID, key, bb.capacity(), bb, longBuffer, 0);
checkForError(ret, "can not receive info string");
return new String(bb.array(), 0, (int)longBuffer[0]);
}
@Override
public String toString() {
return "CLPlatform [name:" + getName()
+" vendor:"+getVendor()
+" profile:"+getProfile()
+" version:"+getVersion()+"]";
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final CLPlatform other = (CLPlatform) obj;
if (this.ID != other.ID) {
return false;
}
return true;
}
@Override
public int hashCode() {
int hash = 7;
hash = 71 * hash + (int) (this.ID ^ (this.ID >>> 32));
return hash;
}
}
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