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#!/usr/bin/env python
import argparse
from boltzgen import *
argparser = argparse.ArgumentParser(
description = 'Generate LBM kernels in various languages using a symbolic description.')
argparser.add_argument('language', help = 'Target language (currently either "cl" or "cpp")')
argparser.add_argument('--lattice', required = True, help = 'Lattice type (D2Q9, D3Q7, D3Q19, D3Q27)')
argparser.add_argument('--layout', required = True, help = 'Memory layout ("AOS" or "SOA")')
argparser.add_argument('--precision', required = True, help = 'Floating precision ("single" or "double")')
argparser.add_argument('--geometry', required = True, help = 'Size of the block geometry ("x:y(:z)")')
argparser.add_argument('--tau', required = True, help = 'BGK relaxation time')
argparser.add_argument('--disable-cse', action = 'store_const', const = True, help = 'Disable common subexpression elimination')
argparser.add_argument('--functions', action = 'append', nargs = '+', default = [], help = 'Function templates to be generated')
argparser.add_argument('--extras', action = 'append', nargs = '+', default = [], help = 'Additional generator parameters')
args = argparser.parse_args()
lattice = eval("lbm.model.%s" % args.lattice)
lbm = LBM(lattice)
generator = Generator(
descriptor = lattice,
moments = lbm.moments(optimize = not args.disable_cse),
collision = lbm.bgk(f_eq = lbm.equilibrium(), tau = float(args.tau), optimize = not args.disable_cse))
geometry = Geometry.parse(args.geometry)
functions = sum(args.functions, [])
if len(functions) == 0:
functions += ['default']
if 'default' in functions:
for f in ['collide_and_stream', 'equilibrilize', 'collect_moments', 'momenta_boundary']:
functions.insert(functions.index('default'), f)
functions.remove('default')
extras = sum(args.extras, [])
src = generator.kernel(args.language, args.precision, args.layout, geometry, functions, extras)
print(src)
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