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import pyopencl as cl
mf = cl.mem_flags
import numpy
from utility.ndindex import ndindex
import sympy
from mako.template import Template
from mako.lookup import TemplateLookup
from pathlib import Path
from pyopencl.tools import get_gl_sharing_context_properties
class Geometry:
def __init__(self, size_x, size_y, size_z = 1):
self.size_x = size_x
self.size_y = size_y
self.size_z = size_z
self.volume = size_x * size_y * size_z
def inner_cells(self):
for idx in numpy.ndindex(self.inner_size()):
yield tuple(map(lambda i: i + 1, idx))
def size(self):
if self.size_z == 1:
return (self.size_x, self.size_y)
else:
return (self.size_x, self.size_y, self.size_z)
def inner_size(self):
if self.size_z == 1:
return (self.size_x-2, self.size_y-2)
else:
return (self.size_x-2, self.size_y-2, self.size_z-2)
def wireframe(self):
if self.size_z > 1:
return ([
[0 , 0 , 0 ],
[self.size_x, 0 , 0 ],
[self.size_x, self.size_y, 0 ],
[0 , self.size_y, 0 ],
[0 , 0 , self.size_z],
[self.size_x, 0 , self.size_z],
[self.size_x, self.size_y, self.size_z],
[0 , self.size_y, self.size_z]
],
[
(0,1), (1,2), (2,3), (3,0),
(4,5), (5,6), (6,7), (7,4),
(0,4), (1,5), (2,6), (3,7)
])
else:
return ([
[0 , 0 ],
[self.size_x, 0 ],
[self.size_x, self.size_y],
[0 , self.size_y],
],
[
(0,1), (1,2), (2,3), (3,0)
])
def pad(n, m):
return (n // m + min(1,n % m)) * m
class Grid:
def __init__(self, geometry, padding = None):
if padding == None:
self.size_x = geometry.size_x
self.size_y = geometry.size_y
self.size_z = geometry.size_z
else:
self.size_x = pad(geometry.size_x, padding[0])
self.size_y = pad(geometry.size_y, padding[1])
if geometry.size_z == 1:
self.size_z = geometry.size_z
else:
self.size_z = pad(geometry.size_z, padding[2])
self.volume = self.size_x * self.size_y * self.size_z
def size(self):
if self.size_z == 1:
return (self.size_x, self.size_y)
else:
return (self.size_x, self.size_y, self.size_z)
class Memory:
def __init__(self, descriptor, grid, context, float_type, align, opengl):
self.descriptor = descriptor
self.context = context
self.float_type = float_type
if align:
self.size_x = pad(grid.size_x, {
numpy.float32: 32,
numpy.float64: 16
}.get(float_type, None))
else:
self.size_x = grid.size_x
self.size_y = grid.size_y
self.size_z = grid.size_z
self.volume = self.size_x * self.size_y * self.size_z
self.pop_size = descriptor.q * self.volume * self.float_type(0).nbytes
self.moments_size = (descriptor.d+1) * self.volume * self.float_type(0).nbytes
self.cl_pop_a = cl.Buffer(self.context, mf.READ_WRITE, size=self.pop_size)
self.cl_pop_b = cl.Buffer(self.context, mf.READ_WRITE, size=self.pop_size)
self.cl_moments = cl.Buffer(self.context, mf.WRITE_ONLY, size=self.moments_size)
self.cl_material = cl.Buffer(self.context, mf.READ_WRITE, size=self.volume * numpy.int32(0).nbytes)
def gid(self, x, y, z = 0):
return z * (self.size_x*self.size_y) + y * self.size_x + x;
def size(self):
if self.size_z == 1:
return (self.size_x, self.size_y)
else:
return (self.size_x, self.size_y, self.size_z)
def cells(self):
return ndindex(self.size(), order='F')
class Lattice:
def __init__(self,
descriptor, geometry, moments, collide,
pop_eq_src = '', boundary_src = '',
platform = 0, precision = 'single', layout = None, padding = None, align = False, opengl = False
):
self.descriptor = descriptor
self.geometry = geometry
self.grid = Grid(self.geometry, padding)
self.time = 0
self.float_type = {
'single': (numpy.float32, 'float'),
'double': (numpy.float64, 'double'),
}.get(precision, None)
self.mako_lookup = TemplateLookup(directories = [
Path(__file__).parent
])
self.platform = cl.get_platforms()[platform]
if opengl:
try:
self.context = cl.Context(
properties = [
(cl.context_properties.PLATFORM, self.platform)
] + get_gl_sharing_context_properties())
except:
self.context = cl.Context(
properties = [
(cl.context_properties.PLATFORM, self.platform)
] + get_gl_sharing_context_properties(),
devices = [ self.platform.get_devices()[0] ])
else:
self.context = cl.Context(
properties=[(cl.context_properties.PLATFORM, self.platform)])
self.queue = cl.CommandQueue(self.context)
self.memory = Memory(self.descriptor, self.grid, self.context, self.float_type[0], align, opengl)
self.tick = False
self.moments = moments
self.collide = collide
self.pop_eq_src = pop_eq_src
self.boundary_src = boundary_src
self.layout = layout
self.compiler_args = {
'single': '-cl-single-precision-constant -cl-fast-relaxed-math',
'double': '-cl-fast-relaxed-math'
}.get(precision, None)
self.build_kernel()
self.program.equilibrilize(
self.queue, self.grid.size(), self.layout, self.memory.cl_pop_a, self.memory.cl_pop_b).wait()
self.material = numpy.ndarray(shape=(self.memory.volume, 1), dtype=numpy.int32)
def apply_material_map(self, material_map):
for primitive, material in material_map:
if callable(primitive):
self.material[[primitive(*idx) for idx in self.memory.cells()]] = material
else:
indicator = primitive.indicator()
self.material[[indicator(*idx) for idx in self.memory.cells()]] = material
def setup_channel_with_sdf_obstacle(self, sdf_src):
sdf_kernel_src = Template(
filename = 'template/sdf.cl.mako',
lookup = self.mako_lookup
).render(
geometry = self.memory,
sdf_src = sdf_src
)
sdf_program = cl.Program(self.context, sdf_kernel_src).build(self.compiler_args)
sdf_program.setup_channel_with_sdf_obstacle(self.queue, self.memory.size(), None, self.memory.cl_material)
cl.enqueue_copy(self.queue, self.material, self.memory.cl_material).wait()
def sync_material(self):
cl.enqueue_copy(self.queue, self.memory.cl_material, self.material).wait()
def build_kernel(self):
program_src = Template(filename = str(Path(__file__).parent/'template/kernel.mako')).render(
descriptor = self.descriptor,
geometry = self.geometry,
memory = self.memory,
moments_subexpr = self.moments[0],
moments_assignment = self.moments[1],
collide_subexpr = self.collide[0],
collide_assignment = self.collide[1],
float_type = self.float_type[1],
pop_eq_src = Template(self.pop_eq_src).render(
descriptor = self.descriptor,
geometry = self.geometry,
memory = self.memory,
float_type = self.float_type[1],
),
boundary_src = Template(self.boundary_src).render(
descriptor = self.descriptor,
geometry = self.geometry,
memory = self.memory,
float_type = self.float_type[1],
),
ccode = sympy.ccode
)
self.program = cl.Program(self.context, program_src).build(self.compiler_args)
def evolve(self):
self.time += 1
if self.tick:
self.tick = False
self.program.collide_and_stream(
self.queue, self.grid.size(), self.layout
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