1 files changed, 98 insertions, 0 deletions
diff --git a/lbm.py b/lbm.py
new file mode 100644
index 0000000..5118f17
--- /dev/null
+++ b/lbm.py
@@ -0,0 +1,98 @@
+import pyopencl as cl
+mf = cl.mem_flags
+
+import numpy
+import sympy
+
+from mako.template import Template
+
+class Lattice:
+    def __init__(self, descriptor, nX, nY, moments, collide, geometry, pop_eq_src = '', boundary_src = ''):
+        self.descriptor = descriptor
+
+        self.nX = nX
+        self.nY = nY
+        self.nCells = nX * nY
+
+        self.moments = moments
+        self.collide = collide
+
+        self.pop_eq_src = pop_eq_src
+        self.boundary_src = boundary_src
+
+        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.tick = True
+
+        self.pop_size     = descriptor.q     * self.nCells * numpy.float32(0).nbytes
+        self.moments_size = (descriptor.d+1) * self.nCells * numpy.float32(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_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 idx(self, x, y):
+        return y * self.nX + x;
+
+    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(
+            descriptor = self.descriptor,
+
+            nX     = self.nX,
+            nY     = self.nY,
+            nCells = self.nCells,
+
+            moments_helper     = self.moments[0],
+            moments_assignment = self.moments[1],
+            collide_helper     = self.collide[0],
+            collide_assignment = self.collide[1],
+
+            pop_eq_src = Template(self.pop_eq_src).render(
+                descriptor = self.descriptor,
+                nX     = self.nX,
+                nY     = self.nY,
+                nCells = self.nCells
+            ),
+            boundary_src = Template(self.boundary_src).render(
+                descriptor = self.descriptor
+            ),
+
+            ccode = sympy.ccode
+        )
+        self.program = cl.Program(self.context, program_src).build('-cl-single-precision-constant -cl-fast-relaxed-math')
+
+    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=(self.descriptor.d+1, 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