#######################################################

# 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

########################################################

import platform

import ctypes as ct

def load_backend(name):

platform_name = platform.system()

assert(len(platform_name) >= 3)

libname = 'libaf' + name

if platform_name == 'Linux':

libname += '.so'

elif platform_name == 'Darwin':

libname += '.dylib'

elif platform_name == "Windows" or platform_name[:3] == "CYG":

libname += '.dll'

libname = libname[3:] # remove 'lib'

if platform_name == "Windows":

'''

Supressing crashes caused by missing dlls

http://stackoverflow.com/questions/8347266/missing-dll-print-message-instead-of-launching-a-popup

https://msdn.microsoft.com/en-us/library/windows/desktop/ms680621.aspx

'''

ct.windll.kernel32.SetErrorMode(0x0001 | 0x0002);

else:

raise OSError(platform_name + ' not supported')

ct.cdll.LoadLibrary(libname)

clib = ct.CDLL(libname)

print("Using %s backend" % name)

return clib

try:

clib = load_backend('cuda')

except:

try:

clib = load_backend('opencl')

except:

clib = load_backend('cpu')

AF_SUCCESS = ct.c_int(0)

#100-199 Errors in environment

AF_ERR_NO_MEM = ct.c_int(101)

AF_ERR_DRIVER = ct.c_int(102)

AF_ERR_RUNTIME = ct.c_int(103)

# 200-299 Errors in input parameters

AF_ERR_INVALID_ARRAY = ct.c_int(201)

AF_ERR_ARG = ct.c_int(202)

AF_ERR_SIZE = ct.c_int(203)

AF_ERR_TYPE = ct.c_int(204)

AF_ERR_DIFF_TYPE = ct.c_int(205)

AF_ERR_BATCH = ct.c_int(207)

# 300-399 Errors for missing software features

AF_ERR_NOT_SUPPORTED = ct.c_int(301)

AF_ERR_NOT_CONFIGURED = ct.c_int(302)

# 400-499 Errors for missing hardware features

AF_ERR_NO_DBL = ct.c_int(401)

AF_ERR_NO_GFX = ct.c_int(402)

# 900-999 Errors from upstream libraries and runtimes

AF_ERR_INTERNAL = ct.c_int(998)

AF_ERR_UNKNOWN = ct.c_int(999)

f32 = ct.c_int(0)

c32 = ct.c_int(1)

f64 = ct.c_int(2)

c64 = ct.c_int(3)

b8 = ct.c_int(4)

s32 = ct.c_int(5)

u32 = ct.c_int(6)

u8 = ct.c_int(7)

s64 = ct.c_int(8)

u64 = ct.c_int(9)

afDevice = ct.c_int(0)

afHost = ct.c_int(1)

AF_INTERP_NEAREST = ct.c_int(0)

AF_INTERP_LINEAR = ct.c_int(1)

AF_INTERP_BILINEAR = ct.c_int(2)

AF_INTERP_CUBIC = ct.c_int(3)

AF_PAD_ZERO = ct.c_int(0)

AF_PAD_SYM = ct.c_int(1)

AF_CONNECTIVITY_4 = ct.c_int(4)

AF_CONNECTIVITY_8 = ct.c_int(8)

AF_CONV_DEFAULT = ct.c_int(0)

AF_CONV_EXPAND = ct.c_int(1)

AF_CONV_AUTO = ct.c_int(0)

AF_CONV_SPATIAL = ct.c_int(1)

AF_CONV_FREQ = ct.c_int(2)

AF_SAD = ct.c_int(0)

AF_ZSAD = ct.c_int(1)

AF_LSAD = ct.c_int(2)

AF_SSD = ct.c_int(3)

AF_ZSSD = ct.c_int(4)

AF_LSSD = ct.c_int(5)

AF_NCC = ct.c_int(6)

AF_ZNCC = ct.c_int(7)

AF_SHD = ct.c_int(8)

AF_GRAY = ct.c_int(0)

AF_RGB = ct.c_int(1)

AF_HSV = ct.c_int(2)

AF_MAT_NONE = ct.c_int(0)

AF_MAT_TRANS = ct.c_int(1)

AF_MAT_CTRANS = ct.c_int(2)

AF_MAT_UPPER = ct.c_int(32)

AF_MAT_LOWER = ct.c_int(64)

AF_MAT_DIAG_UNIT = ct.c_int(128)

AF_MAT_SYM = ct.c_int(512)

AF_MAT_POSDEF = ct.c_int(1024)

AF_MAT_ORTHOG = ct.c_int(2048)

AF_MAT_TRI_DIAG = ct.c_int(4096)

AF_MAT_BLOCK_DIAG = ct.c_int(8192)

AF_NORM_VECTOR_1 = ct.c_int(0)

AF_NORM_VECTOR_INF = ct.c_int(1)

AF_NORM_VECTOR_2 = ct.c_int(2)

AF_NORM_VECTOR_P = ct.c_int(3)

AF_NORM_MATRIX_1 = ct.c_int(4)

AF_NORM_MATRIX_INF = ct.c_int(5)

AF_NORM_MATRIX_2 = ct.c_int(6)

AF_NORM_MATRIX_L_PQ = ct.c_int(7)

AF_NORM_EUCLID = AF_NORM_VECTOR_2

AF_COLORMAP_DEFAULT = ct.c_int(0)

AF_COLORMAP_SPECTRUM = ct.c_int(1)

AF_COLORMAP_COLORS = ct.c_int(2)

AF_COLORMAP_RED = ct.c_int(3)

AF_COLORMAP_MOOD = ct.c_int(4)

AF_COLORMAP_HEAT = ct.c_int(5)

AF_COLORMAP_BLUE = ct.c_int(6)