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import sympy
from mako.template import Template
from pathlib import Path
import kernel.target.cl
import kernel.target.cpp
class Generator:
def __init__(self, descriptor, moments, collision):
self.descriptor = descriptor
self.moments = moments
self.collision = collision
def instantiate(self, target, template, float_type, layout_impl, geometry, extras = []):
template_path = Path(__file__).parent/("template/%s.%s.mako" % (template, target))
if not template_path.exists():
raise Exception("Target '%s' doesn't provide '%s'" % (target, template))
return Template(filename = str(template_path)).render(
descriptor = self.descriptor,
geometry = geometry,
layout = layout_impl,
moments_subexpr = self.moments[0],
moments_assignment = self.moments[1],
collision_subexpr = self.collision[0],
collision_assignment = self.collision[1],
ccode = sympy.ccode,
float_type = float_type,
extras = extras
)
def kernel(self, target, precision, layout, geometry, functions = ['collide_and_stream'], extras = []):
layout_impl = eval("kernel.target.%s.%s" % (target, layout))
if layout_impl is None:
raise Exception("Target '%s' doesn't support layout '%s'" % (target, layout))
else:
layout_impl = layout_impl(self.descriptor, geometry)
if geometry.dimension() != self.descriptor.d:
raise Exception('Geometry dimension must match descriptor dimension')
float_type = {
'single': 'float',
'double': 'double'
}.get(precision)
return "\n".join(map(lambda f: self.instantiate(target, f, float_type, layout_impl, geometry, extras), functions))
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