C++ clCreateContextFromType函数代码示例

cl_context get_first_platform(){
	cl_uint num_platforms;
	cl_platform_id platform;
	cl_int err = clGetPlatformIDs(1, &platform, &num_platforms);
	if (check_cl_err(err, "Failed to find a platform") || num_platforms < 1){
		return NULL;
	}
	char name[64];
	err = clGetPlatformInfo(platform, CL_PLATFORM_NAME, 64, name, NULL);
	//This error probably shouldn't happen, but check anyway
	check_cl_err(err, "Failed to get platform name");
	printf("Selecting platform: %s\n", name);

	//Try to get a GPU context on the platform
	cl_context_properties properties[] = {
		CL_CONTEXT_PLATFORM, (cl_context_properties)platform, 0
	};
	cl_context context = clCreateContextFromType(properties, CL_DEVICE_TYPE_GPU,
		cl_err_callback, NULL, &err);
	if (check_cl_err(err, "Failed to create GPU context, retrying CPU")){
		context = clCreateContextFromType(properties, CL_DEVICE_TYPE_CPU,
			NULL, NULL, &err);
		if (check_cl_err(err, "Failed to create a GPU or CPU context")){
			return NULL;
		}
	}
	return context;
}

cl_context CreateContext() {
  cl_int errNum;
  cl_uint numPlatforms;
  cl_platform_id firstPlatformId;
  cl_context context = NULL;
  
  //Select platform to run on
  errNum = clGetPlatformIDs(1, &firstPlatformId, &numPlatforms);
  if(errNum != CL_SUCCESS || numPlatforms <= 0) {
    printf("Failed to find an OpenCL platform");
    return NULL;
  }
  
  //Create context on platform (try GPU if fails then CPU)
  cl_context_properties contextProperties[] = {
    CL_CONTEXT_PLATFORM,
    (cl_context_properties)firstPlatformId,
    0
  };
  context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_GPU, NULL, NULL, &errNum);
  if(errNum != CL_SUCCESS) {
    context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_CPU, NULL, NULL, &errNum);
    if(errNum != CL_SUCCESS) {
      printf("Failed to create an OpenCL context");
      return NULL;
    }
  }
  return context;
}

cl_context QHoneycombWidget::CreateContext()
{
  cl_int errNum;
  cl_uint numPlatforms;
  cl_platform_id firstPlatformId;
  cl_context context = NULL;

  // First, select an OpenCL platform to run on.  For this example, we
  // simply choose the first available platform.  Normally, you would
  // query for all available platforms and select the most appropriate one.
  errNum = clGetPlatformIDs(1, &firstPlatformId, &numPlatforms);
  if (errNum != CL_SUCCESS || numPlatforms <= 0)
  {
    std::cerr << "Failed to find any OpenCL platforms." << std::endl;
    return NULL;
  }

  // Next, create an OpenCL context on the platform.  Attempt to
  // create a GPU-based context, and if that fails, try to create
  // a CPU-based context.
  cl_context_properties contextProperties[] =
  {
#ifdef _WIN32
    CL_CONTEXT_PLATFORM,
    (cl_context_properties)firstPlatformId,
    CL_GL_CONTEXT_KHR,
    (cl_context_properties)wglGetCurrentContext(),
    CL_WGL_HDC_KHR,
    (cl_context_properties)wglGetCurrentDC(),
#elif defined( __GNUC__)
    CL_CONTEXT_PLATFORM, (cl_context_properties)clSelectedPlatformID,
    CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
    CL_GLX_DISPLAY_KHR, (cl_context_properties)glXGetCurrentDisplay(),
#elif defined(__APPLE__) 
    //todo
#endif
    0



  };
  context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_GPU,
    NULL, NULL, &errNum);
  if (errNum != CL_SUCCESS)
  {
    std::cout << "Could not create GPU context, trying CPU..." << std::endl;
    context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_CPU,
      NULL, NULL, &errNum);
    if (errNum != CL_SUCCESS)
    {
      std::cerr << "Failed to create an OpenCL GPU or CPU context." << std::endl;
      return NULL;
    }
  }

  return context;
}

cl_context CreateContext() {
    cl_int errNum;
    cl_uint numPlatforms;
    cl_platform_id firstPlatformId;
    cl_context context = NULL;

    // First, select an OpenCL platform to run on.  For this example, we
    // simply choose the first available platform.  Normally, you would
    // query for all available platforms and select the most appropriate one.



    errNum = clGetPlatformIDs(1, &firstPlatformId, &numPlatforms);



    if (errNum != CL_SUCCESS || numPlatforms <= 0)
    {
        printf("Failed to find any OpenCL platforms.\n");
        return NULL;
    }



    // Next, create an OpenCL context on the platform.  Attempt to
    // create a GPU-based context, and if that fails, try to create
    // a CPU-based context.
    cl_context_properties contextProperties[] = { CL_CONTEXT_PLATFORM, (cl_context_properties)firstPlatformId, 0 };


    if (CPUGPUFLAG == 1)
    {
    	context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_GPU, NULL, NULL, &errNum);
    	if (errNum != CL_SUCCESS)
    	{
    		printf("Could not create GPU context.\n");
    		return NULL;
    	}
    }


    if (CPUGPUFLAG == 0)
    {
    	context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_CPU, NULL, NULL, &errNum);
    	if (errNum != CL_SUCCESS)
    	{
    		printf("Failed to create an OpenCL GPU or CPU context.\n");
    		return NULL;
    	}

    }


    return context;
}

cl_int OCL_Platform::init(cl_platform_id id)
{
	cl_int err;
	mID = id;

	// store name
	size_t nameSize;
	OCL_RETURN_ON_ERR( clGetPlatformInfo( mID, CL_PLATFORM_NAME, 0, NULL, &nameSize ) );

	sPlatformName = new char[nameSize];
	OCL_RETURN_ON_ERR( clGetPlatformInfo( mID, CL_PLATFORM_NAME, nameSize, sPlatformName, NULL ) );

	// store extensions
	size_t extensionsSize;
	OCL_RETURN_ON_ERR( clGetPlatformInfo( mID, CL_PLATFORM_EXTENSIONS, 0, NULL, &extensionsSize ) );

	sPlatformExtensions = new char[extensionsSize];
	OCL_RETURN_ON_ERR( clGetPlatformInfo( mID, CL_PLATFORM_EXTENSIONS, extensionsSize, sPlatformExtensions, NULL ) );

	// default device type 
	cl_device_type deviceType = CL_DEVICE_TYPE_ALL;

	cl_context_properties ctxProps[] = 
	{
		CL_CONTEXT_PLATFORM, 
		(cl_context_properties)mID, 
		0 
	};

	OCL_RETURN_ON_ERR( ( mContext = clCreateContextFromType( ctxProps, deviceType, NULL, NULL, &err ), err));

	// Create array of devices
	size_t dev_ids_size;
	OCL_RETURN_ON_ERR( clGetContextInfo( mContext, CL_CONTEXT_DEVICES, 0, NULL, &dev_ids_size ) );

	uiNumDevices = (cl_uint)dev_ids_size/sizeof(cl_device_id);
	cl_device_id* pDeviceIDs = (cl_device_id*)calloc(1,dev_ids_size);

	mpDevices = new OCL_DeviceAndQueue[uiNumDevices];

	OCL_RETURN_ON_ERR( clGetContextInfo( mContext, CL_CONTEXT_DEVICES, dev_ids_size, pDeviceIDs, NULL ) );

	for( cl_uint j=0; j<uiNumDevices; j++ )
	{
		OCL_RETURN_ON_ERR( mpDevices[j].init( mContext, pDeviceIDs[j] ) );
		OCL_RETURN_ON_ERR( 
			(mpDevices[j].mContext = clCreateContextFromType( ctxProps, deviceType, NULL, NULL, &err )
			,err ));
	}

	delete pDeviceIDs;

	return CL_SUCCESS;
}

bool createContext()
{
    cl_int err = 0;
    cl_uint numberOfPlatforms = 0;
    cl_platform_id firstPlatformID = 0;

    /* Retrieve a single platform ID. */
    err = clGetPlatformIDs(1, &firstPlatformID, &numberOfPlatforms);
    if(err != CL_SUCCESS)
    {
        printf("Error: Failed clGetPlatformIds\n");
        return false;
    }

    if (numberOfPlatforms <= 0)
    {
        printf("No OpenCL platforms found.\n");
        return false;
    }

    /* Get a context with a GPU device from the platform found above. */
    cl_context_properties contextProperties [] = {CL_CONTEXT_PLATFORM, (cl_context_properties)firstPlatformID, 0};
    ocl.context = clCreateContextFromType(contextProperties, CL_DEVICE_TYPE_GPU, NULL, NULL, &err);
    if (err != CL_SUCCESS)
    {
        printf("Creating an OpenCL context failed.\n");
        return false;
    }

    return true;

}

oclHardware getOclHardware(cl_device_type type)
{
    oclHardware hardware = {0, 0, 0, 0, 0, 0};
    cl_platform_id platforms[16] = { 0 };
    cl_device_id devices[16];
    char platformName[256];
    char deviceName[256];
    cl_uint platformCount = 0;
    cl_int err = clGetPlatformIDs(0, 0, &platformCount);
    err = clGetPlatformIDs(16, platforms, &platformCount);
    if (err != CL_SUCCESS) {
        std::cout << oclErrorCode(err) << "\n";
        return hardware;
    }

    for (cl_uint i = 0; i < platformCount; i++) {
        err = clGetPlatformInfo(platforms[i], CL_PLATFORM_NAME, 256, platformName, 0);
        if (err != CL_SUCCESS) {
            std::cout << oclErrorCode(err) << "\n";
            return hardware;
        }
        cl_uint deviceCount = 0;
        
        err = clGetDeviceIDs(platforms[i], type, 16, devices, &deviceCount);
          
          
        //err = clGetDeviceIDs(platforms[i], CL_DEVICE_TYPE_CPU, 16, devices, &deviceCount);

        if ((err != CL_SUCCESS) || (deviceCount == 0)) {
            continue;
        }

        err = clGetDeviceInfo(devices[0], CL_DEVICE_NAME, 256, deviceName, 0);
        if (err != CL_SUCCESS) {
            std::cout << oclErrorCode(err) << "\n";
            return hardware;
        }

        cl_context_properties contextData[3] = {CL_CONTEXT_PLATFORM, (cl_context_properties)platforms[i], 0};
        cl_context context = clCreateContextFromType(contextData, type, 0, 0, &err);
        if (err != CL_SUCCESS) {
            continue;
        }
        cl_command_queue queue = clCreateCommandQueue(context, devices[0], 0, &err);
        if (err != CL_SUCCESS) {
            std::cout << oclErrorCode(err) << "\n";
            return hardware;
        }
        hardware.mPlatform = platforms[i];
        hardware.mContext = context;
        hardware.mDevice = devices[0];
        hardware.mQueue = queue;
        getDeviceVersion(hardware);
        std::cout << "Platform = " << platformName << "\n";
        std::cout << "Device = " << deviceName << "\n";
        std::cout << "OpenCL Version = " << hardware.mMajorVersion << '.' << hardware.mMinorVersion << "\n";
        return hardware;
    }
    return hardware;
}

static int initialize(int use_gpu)
{
	cl_int result;
	size_t size;

#ifndef POCL_HSA
	// create OpenCL context
	cl_platform_id platform_id;
	if (clGetPlatformIDs(1, &platform_id, NULL) != CL_SUCCESS) { printf("ERROR: clGetPlatformIDs(1,*,0) failed\n"); return -1; }
	cl_context_properties ctxprop[] = { CL_CONTEXT_PLATFORM, (cl_context_properties)platform_id, 0};
	device_type = use_gpu ? CL_DEVICE_TYPE_GPU : CL_DEVICE_TYPE_CPU;
	context = clCreateContextFromType( ctxprop, device_type, NULL, NULL, NULL );
#else
	context = poclu_create_any_context();
#endif
	if( !context ) { printf("ERROR: clCreateContextFromType(%s) failed\n", use_gpu ? "GPU" : "CPU"); return -1; }

	// get the list of GPUs
	result = clGetContextInfo( context, CL_CONTEXT_DEVICES, 0, NULL, &size );
	num_devices = (int) (size / sizeof(cl_device_id));
	
	if( result != CL_SUCCESS || num_devices < 1 ) { printf("ERROR: clGetContextInfo() failed\n"); return -1; }
	device_list = new cl_device_id[num_devices];
	if( !device_list ) { printf("ERROR: new cl_device_id[] failed\n"); return -1; }
	result = clGetContextInfo( context, CL_CONTEXT_DEVICES, size, device_list, NULL );
	if( result != CL_SUCCESS ) { printf("ERROR: clGetContextInfo() failed\n"); return -1; }

	// create command queue for the first device
	cmd_queue = clCreateCommandQueue( context, device_list[0], 0, NULL );
	if( !cmd_queue ) { printf("ERROR: clCreateCommandQueue() failed\n"); return -1; }

	return 0;
}

static int initialize(int use_device)
{
	cl_int result;
	size_t size;

	// create OpenCL context
	cl_platform_id platform_id;
	if (clGetPlatformIDs(1, &platform_id, NULL) != CL_SUCCESS) { printf("ERROR: clGetPlatformIDs(1,*,0) failed\n"); return -1; }
	cl_context_properties ctxprop[] = { CL_CONTEXT_PLATFORM, (cl_context_properties)platform_id, 0};
	//device_type = use_device ? CL_DEVICE_TYPE_GPU : CL_DEVICE_TYPE_CPU;
        switch(use_device) {
            case 0: device_type = CL_DEVICE_TYPE_CPU; break;
            case 1: device_type = CL_DEVICE_TYPE_GPU; break;
            case 2: device_type = CL_DEVICE_TYPE_ACCELERATOR; break;
        }
	context = clCreateContextFromType( ctxprop, device_type, NULL, NULL, NULL );
	if( !context ) { printf("ERROR: clCreateContextFromType(%s) failed\n", use_device ? "GPU" : "CPU"); return -1; }

	// get the list of GPUs
	result = clGetContextInfo( context, CL_CONTEXT_DEVICES, 0, NULL, &size );
	num_devices = (int) (size / sizeof(cl_device_id));
	printf("num_devices = %d\n", num_devices);
	
	if( result != CL_SUCCESS || num_devices < 1 ) { printf("ERROR: clGetContextInfo() failed\n"); return -1; }
	device_list = new cl_device_id[num_devices];
	//device_list = (cl_device_id *)malloc(sizeof(cl_device_id)*num_devices);
	if( !device_list ) { printf("ERROR: new cl_device_id[] failed\n"); return -1; }
	result = clGetContextInfo( context, CL_CONTEXT_DEVICES, size, device_list, NULL );
	if( result != CL_SUCCESS ) { printf("ERROR: clGetContextInfo() failed\n"); return -1; }

	// create command queue for the first device
	cmd_queue = clCreateCommandQueue( context, device_list[0], 0, NULL );
	if( !cmd_queue ) { printf("ERROR: clCreateCommandQueue() failed\n"); return -1; }
	return 0;
}

 context(cl_device_type t, cl_context_properties *props = 0)
 {
   cl_int status;
   impl_ = clCreateContextFromType(props, t, context::callback, this, &status);
   if (status < 0)
     OVXX_DO_THROW(exception("clCreateContextFromType", status));
 }

nsresult dpoCContext::InitContext(cl_platform_id platform)
{
	cl_int err_code;
	cl_device_id *devices;
	size_t cb;

	cl_context_properties context_properties[3] = {CL_CONTEXT_PLATFORM, (cl_context_properties)platform, NULL};
	
	context = clCreateContextFromType(context_properties, CL_DEVICE_TYPE_CPU, ReportCLError, this, &err_code);
	if (err_code != CL_SUCCESS) {
		DEBUG_LOG_ERROR("InitContext", err_code);
		return NS_ERROR_NOT_AVAILABLE;
	}

	err_code = clGetContextInfo(context, CL_CONTEXT_DEVICES, 0, NULL, &cb);
	if (err_code != CL_SUCCESS) {
		DEBUG_LOG_ERROR("InitContext", err_code);
		return NS_ERROR_NOT_AVAILABLE;
	}

	devices = (cl_device_id *)nsMemory::Alloc(sizeof(cl_device_id)*cb);
	if (devices == NULL) {
		DEBUG_LOG_STATUS("InitContext", "Cannot allocate device list");
		return NS_ERROR_OUT_OF_MEMORY;
	}

	err_code = clGetContextInfo(context, CL_CONTEXT_DEVICES, cb, devices, NULL);
	if (err_code != CL_SUCCESS) {
		DEBUG_LOG_ERROR("InitContext", err_code);
		nsMemory::Free(devices);
		return NS_ERROR_NOT_AVAILABLE;
	}

	cmdQueue = clCreateCommandQueue(context, devices[0], 
#ifdef CLPROFILE 
		CL_QUEUE_PROFILING_ENABLE |
#endif /* CLPROFILE */
#ifdef OUTOFORDERQUEUE
		CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE |
#endif /* OUTOFORDERQUEUE */
		0,
		&err_code);
	if (err_code != CL_SUCCESS) {
		DEBUG_LOG_ERROR("InitContext", err_code);
		nsMemory::Free(devices);
		return NS_ERROR_NOT_AVAILABLE;
	}

	DEBUG_LOG_STATUS("InitContext", "queue is " << cmdQueue);

	nsMemory::Free(devices);

	kernelFailureMem = clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(int), NULL, &err_code);
	if (err_code != CL_SUCCESS) {
		DEBUG_LOG_ERROR("InitContext", err_code);
		return NS_ERROR_NOT_AVAILABLE;
	}

	return NS_OK;
}

cl_context OCLContexts::GetContextByPlatformName(
    const std::string &platName, OCLContextProperties ctx_props) {
    OCLErrorExp clerr;
    cl_context found_ctx = m_contextMap[platName];

    if ( found_ctx != NULL ) {
        return found_ctx;
    }
    cl_platform_id platform = NULL;

    for (size_t i=0; i<get_num_platforms(); i++) {
        if (get_platform_name(i) == platName ) {
            platform = m_platforms[i];
            break;
        }
    }

    ctx_props.AddProperty(CL_CONTEXT_PLATFORM, (cl_context_properties) platform);
    found_ctx = clCreateContextFromType(ctx_props, CL_DEVICE_TYPE_ALL,
                                        NULL, NULL, clerr);
    clerr.CheckError();
    if ( platform != NULL ) {
        m_contextMap[platName] = found_ctx;
    }

    return found_ctx;
}

JNIContext::JNIContext(JNIEnv *jenv, jobject _kernelObject, jobject _openCLDeviceObject, jint _flags): 
      kernelObject(jenv->NewGlobalRef(_kernelObject)),
      kernelClass((jclass)jenv->NewGlobalRef(jenv->GetObjectClass(_kernelObject))), 
      openCLDeviceObject(jenv->NewGlobalRef(_openCLDeviceObject)),
      flags(_flags),
      profileBaseTime(0),
      passes(0),
      exec(NULL),
      deviceType(((flags&com_amd_aparapi_internal_jni_KernelRunnerJNI_JNI_FLAG_USE_GPU)==com_amd_aparapi_internal_jni_KernelRunnerJNI_JNI_FLAG_USE_GPU)?CL_DEVICE_TYPE_GPU:CL_DEVICE_TYPE_CPU),
      profileFile(NULL), 
      valid(JNI_FALSE){
   cl_int status = CL_SUCCESS;
   jobject platformInstance = OpenCLDevice::getPlatformInstance(jenv, openCLDeviceObject);
   cl_platform_id platformId = OpenCLPlatform::getPlatformId(jenv, platformInstance);
   deviceId = OpenCLDevice::getDeviceId(jenv, openCLDeviceObject);
   cl_device_type returnedDeviceType;
   clGetDeviceInfo(deviceId, CL_DEVICE_TYPE,  sizeof(returnedDeviceType), &returnedDeviceType, NULL);
   //fprintf(stderr, "device[%d] CL_DEVICE_TYPE = %x\n", deviceId, returnedDeviceType);


   cl_context_properties cps[3] = { CL_CONTEXT_PLATFORM, (cl_context_properties)platformId, 0 };
   cl_context_properties* cprops = (NULL == platformId) ? NULL : cps;
   context = clCreateContextFromType( cprops, returnedDeviceType, NULL, NULL, &status); 
   CLException::checkCLError(status, "clCreateContextFromType()");
   if (status == CL_SUCCESS){
      valid = JNI_TRUE;
   }
}

cl_context get_platform(cl_device_type type){
	cl_uint num_platforms;
	cl_int err = clGetPlatformIDs(0, NULL, &num_platforms);
	cl_platform_id *platforms = malloc(sizeof(cl_platform_id) * num_platforms);
	err = clGetPlatformIDs(num_platforms, platforms, NULL);
	if (check_cl_err(err, "Failed to find platforms") || num_platforms < 1){
		return NULL;
	}
	cl_context_properties properties[] = {
		CL_CONTEXT_PLATFORM, 0, 0
	};
	cl_context context = NULL;
	for (size_t i = 0; i < num_platforms; ++i){
		properties[1] = (cl_context_properties)platforms[i];
		context = clCreateContextFromType(properties, type, cl_err_callback, NULL, &err);
		if (err == CL_SUCCESS){
			char name[64];
			clGetPlatformInfo(platforms[i], CL_PLATFORM_NAME, 64, name, NULL);
			printf("Selected platform: %s\n", name);
			break;
		}
	}
	free(platforms);
	return context;
}

bool get_cl_context(cl_context *context, cl_device_id **devices, int num_platform)
{
    if (context == NULL || devices == NULL) return false;
    cl_platform_id *platforms = NULL;
    // The iteration variable
    int i;

    cl_uint num;
    check_err(clGetPlatformIDs(0, 0, &num), "Unable to get platforms");

    platforms = (cl_platform_id *)malloc(sizeof(cl_platform_id) * num);
    check_err(clGetPlatformIDs(num, platforms, NULL), "Unable to get platform ID");

    check_err(clGetPlatformIDs(0, 0, &num), "Unable to get platforms");

    printf("Found %d platforms:\n", num);
    for (i = 0; i < num; i++) {
        char str[1024];
        clGetPlatformInfo(platforms[i], CL_PLATFORM_NAME, 1024, str, NULL);
        printf("\t%d: %s\n", i, str);
    }

    cl_context_properties prop[3];
    prop[0] = CL_CONTEXT_PLATFORM;
    prop[1] = (cl_context_properties)platforms[num_platform];
    prop[2] = 0;
    cl_int err;
    *context = clCreateContextFromType(prop, CL_DEVICE_TYPE_ALL, NULL, NULL, &err);
    if (err != CL_SUCCESS) {
        printf("Can't create OpenCL context\n");
        return false;
    }

    size_t size_b;
    int    num_total_devices;
    clGetContextInfo(*context, CL_CONTEXT_DEVICES, 0, NULL, &size_b);
    *devices = (cl_device_id *)malloc(size_b);
    clGetContextInfo(*context, CL_CONTEXT_DEVICES, size_b, *devices, 0);
    if (size_b == 0) {
        printf("Can't get devices\n");
        return false;
    }
    num_total_devices = size_b / sizeof(cl_device_id);

    printf("Found %d devices:\n", num_total_devices);
    for (i = 0; i < num_total_devices; i++) {
        char devname[16][256] = {};
        clGetDeviceInfo(*devices[i], CL_DEVICE_NAME, 256, devname[i], 0);
        printf("\t%d: %s", i, devname[i]);
        clGetDeviceInfo(*devices[i], // Set the device info
                        CL_DEVICE_MAX_COMPUTE_UNITS,
                        sizeof(int),
                        &size_b,
                        0);
        printf("  - %d\n", (int)size_b);
    }

    return true;
}