/** List the OpenCL implementations that contain at least one GPU device. */
public static CLPlatform[] listGPUPoweredPlatforms() {
CLPlatform[] platforms = listPlatforms();
List<CLPlatform> out = new ArrayList<CLPlatform>(platforms.length);
for (CLPlatform platform : platforms) {
if (platform.listGPUDevices(true).length > 0) out.add(platform);
}
return out.toArray(new CLPlatform[out.size()]);
}
/**
* Creates an OpenCL context able to share entities with the current OpenGL context.
*
* @throws RuntimeException if JavaCL is unable to create an OpenGL-shared OpenCL context.
*/
public static CLContext createContextFromCurrentGL() {
RuntimeException first = null;
for (CLPlatform platform : listPlatforms()) {
try {
CLContext ctx = platform.createContextFromCurrentGL();
if (ctx != null) return ctx;
} catch (RuntimeException ex) {
if (first == null) first = ex;
}
}
throw new RuntimeException(
"Failed to create an OpenCL context based on the current OpenGL context", first);
}
/**
* Returns the "best" OpenCL device based on the comparison of the provided prioritized device
* feature.<br>
* The returned device does not necessarily exhibit the features listed in preferredFeatures, but
* it has the best ordered composition of them.<br>
* For instance on a system with a GPU and a CPU device, <code>
* JavaCL.getBestDevice(CPU, MaxComputeUnits)</code> will return the CPU device, but on another
* system with two GPUs and no CPU device it will return the GPU that has the most compute units.
*/
public static CLDevice getBestDevice(CLPlatform.DeviceFeature... preferredFeatures) {
List<CLDevice> devices = new ArrayList<CLDevice>();
for (CLPlatform platform : listPlatforms())
devices.addAll(Arrays.asList(platform.listAllDevices(true)));
return CLPlatform.getBestDevice(Arrays.asList(preferredFeatures), devices);
}