/**
* Create a new context with the given platform and devices, using the given additional context
* properties. The additional context properties are assumed to contain pairs of long values,
* where even entries contain the context property name, and odd values the corresponding value.
* This array may be <code>null</code>.
*
* @param platform The platform
* @param devices The devices
* @param additionalContextProperties Additional context properties
* @return The new context
*/
public static cl_context create(
cl_platform_id platform, List<cl_device_id> devices, long additionalContextProperties[]) {
cl_device_id devicesArray[] = devices.toArray(new cl_device_id[devices.size()]);
cl_context_properties contextProperties = new cl_context_properties();
contextProperties.addProperty(CL_CONTEXT_PLATFORM, platform);
if (additionalContextProperties != null) {
for (int i = 0; i < additionalContextProperties.length / 2; i++) {
contextProperties.addProperty(
additionalContextProperties[i * 2 + 0], additionalContextProperties[i * 2 + 1]);
}
}
cl_context context =
clCreateContext(contextProperties, devicesArray.length, devicesArray, null, null, null);
return context;
}
public void reinit() throws OpenClException {
// Obtain the platform IDs and initialize the context properties
cl_platform_id platforms[] = new cl_platform_id[1];
clGetPlatformIDs(platforms.length, platforms, null);
cl_context_properties contextProperties = new cl_context_properties();
contextProperties.addProperty(CL_CONTEXT_PLATFORM, platforms[0]);
// Create an OpenCL context on a GPU device
context =
CL.clCreateContextFromType(contextProperties, CL.CL_DEVICE_TYPE_GPU, null, null, null);
if (context == null) {
// If no context for a GPU device could be created,
// try to create one for a CPU device.
context =
CL.clCreateContextFromType(contextProperties, CL.CL_DEVICE_TYPE_CPU, null, null, null);
if (context == null) {
throw new OpenClException("Unable to create a context");
}
}
// Enable exceptions and subsequently omit error checks in this sample
CL.setExceptionsEnabled(true);
// Get the list of GPU devices associated with the context
long numBytes[] = new long[1];
CL.clGetContextInfo(context, CL.CL_CONTEXT_DEVICES, 0, null, numBytes);
// Obtain the cl_device_id for the first device
int numDevices = (int) numBytes[0] / Sizeof.cl_device_id;
cl_device_id[] devices = new cl_device_id[numDevices];
CL.clGetContextInfo(context, CL.CL_CONTEXT_DEVICES, numBytes[0], Pointer.to(devices), null);
device = devices[0];
// Create a command-queue
commandQueue = clCreateCommandQueue(context, devices[0], CL.CL_QUEUE_PROFILING_ENABLE, null);
}
