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import pyopencl as cl
mf = cl.mem_flags
import numpy
import sympy
import symbolic.D2Q9 as D2Q9
from mako.template import Template
class Lattice:
def idx(self, x, y):
return y * self.nX + x;
def __init__(self, nX, nY, tau, geometry, pop_eq_src = '', boundary_src = ''):
self.nX = nX
self.nY = nY
self.nCells = nX * nY
self.tau = tau
self.tick = True
self.platform = cl.get_platforms()[0]
self.context = cl.Context(properties=[(cl.context_properties.PLATFORM, self.platform)])
self.queue = cl.CommandQueue(self.context)
self.np_material = numpy.ndarray(shape=(self.nCells, 1), dtype=numpy.int32)
self.setup_geometry(geometry)
self.pop_eq_src = pop_eq_src
self.boundary_src = boundary_src
self.cl_pop_a = cl.Buffer(self.context, mf.READ_WRITE, size=9*self.nCells*numpy.float32(0).nbytes)
self.cl_pop_b = cl.Buffer(self.context, mf.READ_WRITE, size=9*self.nCells*numpy.float32(0).nbytes)
self.cl_moments = cl.Buffer(self.context, mf.WRITE_ONLY, size=3*self.nCells*numpy.float32(0).nbytes)
self.cl_material = cl.Buffer(self.context, mf.READ_ONLY | mf.USE_HOST_PTR, hostbuf=self.np_material)
self.build_kernel()
self.program.equilibrilize(self.queue, (self.nX,self.nY), (32,1), self.cl_pop_a, self.cl_pop_b).wait()
def setup_geometry(self, geometry):
for y in range(1,self.nY-1):
for x in range(1,self.nX-1):
self.np_material[self.idx(x,y)] = geometry(self.nX,self.nY,x,y)
def build_kernel(self):
program_src = Template(filename = './template/kernel.mako').render(
nX = self.nX,
nY = self.nY,
nCells = self.nCells,
tau = self.tau,
moments_helper = D2Q9.moments_opt[0],
moments_assignment = D2Q9.moments_opt[1],
collide_helper = D2Q9.collide_opt[0],
collide_assignment = D2Q9.collide_opt[1],
c = D2Q9.c,
w = D2Q9.w,
ccode = sympy.ccode,
pop_eq_src = Template(self.pop_eq_src).render(
nX = self.nX,
nY = self.nY,
nCells = self.nCells,
c = D2Q9.c,
w = D2Q9.w
),
boundary_src = Template(self.boundary_src).render(
d = D2Q9.d
)
)
self.program = cl.Program(self.context, program_src).build()
def evolve(self):
if self.tick:
self.tick = False
self.program.collide_and_stream(self.queue, (self.nX,self.nY), (32,1), self.cl_pop_a, self.cl_pop_b, self.cl_material)
else:
self.tick = True
self.program.collide_and_stream(self.queue, (self.nX,self.nY), (32,1), self.cl_pop_b, self.cl_pop_a, self.cl_material)
def sync(self):
self.queue.finish()
def get_moments(self):
moments = numpy.ndarray(shape=(3, self.nCells), dtype=numpy.float32)
if self.tick:
self.program.collect_moments(self.queue, (self.nX,self.nY), (32,1), self.cl_pop_b, self.cl_moments)
else:
self.program.collect_moments(self.queue, (self.nX,self.nY), (32,1), self.cl_pop_a, self.cl_moments)
cl.enqueue_copy(self.queue, moments, self.cl_moments).wait();
return moments
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