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#######################################################
# Copyright (c) 2015, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
"""
Functions specific to OpenCL backend.
This module provides interoperability with other OpenCL libraries.
"""
from .util import *
from .library import (_Enum, _Enum_Type)
class DEVICE_TYPE(_Enum):
"""
ArrayFire wrapper for CL_DEVICE_TYPE
"""
CPU = _Enum_Type(1<<1)
GPU = _Enum_Type(1<<2)
ACC = _Enum_Type(1<<3)
UNKNOWN = _Enum_Type(-1)
class PLATFORM(_Enum):
"""
ArrayFire enum for common platforms
"""
AMD = _Enum_Type(0)
APPLE = _Enum_Type(1)
INTEL = _Enum_Type(2)
NVIDIA = _Enum_Type(3)
BEIGNET = _Enum_Type(4)
POCL = _Enum_Type(5)
UNKNOWN = _Enum_Type(-1)
def get_context(retain=False):
"""
Get the current OpenCL context being used by ArrayFire.
Parameters
----------
retain : bool. optional. Default: False.
Specifies if the context needs to be retained by arrayfire before returning.
Returns
-----------
context : integer denoting the context id.
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
context = c_void_ptr_t(0)
safe_call(backend.get().afcl_get_context(c_pointer(context), retain))
return context.value
def get_queue(retain):
"""
Get the current OpenCL command queue being used by ArrayFire.
Parameters
----------
retain : bool. optional. Default: False.
Specifies if the context needs to be retained by arrayfire before returning.
Returns
-----------
queue : integer denoting the queue id.
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
queue = c_int_t(0)
safe_call(backend.get().afcl_get_queue(c_pointer(queue), retain))
return queue.value
def get_device_id():
"""
Get native (unsorted) OpenCL device ID
Returns
--------
idx : int.
Specifies the `cl_device_id` of the device.
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
idx = c_int_t(0)
safe_call(backend.get().afcl_get_device_id(c_pointer(idx)))
return idx.value
def set_device_id(idx):
"""
Set native (unsorted) OpenCL device ID
Parameters
----------
idx : int.
Specifies the `cl_device_id` of the device.
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
safe_call(backend.get().afcl_set_device_id(idx))
return
def add_device_context(dev, ctx, que):
"""
Add a new device to arrayfire opencl device manager
Parameters
----------
dev : cl_device_id
ctx : cl_context
que : cl_command_queue
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
safe_call(backend.get().afcl_add_device_context(dev, ctx, que))
def set_device_context(dev, ctx):
"""
Set a device as current active device
Parameters
----------
dev : cl_device_id
ctx : cl_context
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
safe_call(backend.get().afcl_set_device_context(dev, ctx))
def delete_device_context(dev, ctx):
"""
Delete a device
Parameters
----------
dev : cl_device_id
ctx : cl_context
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
safe_call(backend.get().afcl_delete_device_context(dev, ctx))
_to_device_type = {DEVICE_TYPE.CPU.value : DEVICE_TYPE.CPU,
DEVICE_TYPE.GPU.value : DEVICE_TYPE.GPU,
DEVICE_TYPE.ACC.value : DEVICE_TYPE.ACC,
DEVICE_TYPE.UNKNOWN.value : DEVICE_TYPE.UNKNOWN}
_to_platform = {PLATFORM.AMD.value : PLATFORM.AMD,
PLATFORM.APPLE.value : PLATFORM.APPLE,
PLATFORM.INTEL.value : PLATFORM.INTEL,
PLATFORM.NVIDIA.value : PLATFORM.NVIDIA,
PLATFORM.BEIGNET.value : PLATFORM.BEIGNET,
PLATFORM.POCL.value : PLATFORM.POCL,
PLATFORM.UNKNOWN.value : PLATFORM.UNKNOWN}
def get_device_type():
"""
Get opencl device type
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
res = c_int_t(DEVICE_TYPE.UNKNOWN.value)
safe_call(backend.get().afcl_get_device_type(c_pointer(res)))
return _to_device_type[res.value]
def get_platform():
"""
Get opencl platform
"""
import ctypes as ct
from .util import safe_call as safe_call
from .library import backend
if (backend.name() != "opencl"):
raise RuntimeError("Invalid backend loaded")
res = c_int_t(PLATFORM.UNKNOWN.value)
safe_call(backend.get().afcl_get_platform(c_pointer(res)))
return _to_platform[res.value]