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import pyopencl as cl
mf = cl.mem_flags
import numpy
import sympy
from mako.template import Template
from pathlib import Path
from OpenGL.GL import *
class MomentsTexture:
def __init__(self, lattice, include_materials = True):
self.lattice = lattice
self.include_materials = include_materials
self.gl_texture_buffer = numpy.ndarray(shape=(self.lattice.memory.volume, 4), dtype=self.lattice.memory.float_type)
self.gl_texture_buffer[:,:] = 0.0
self.gl_moments = glGenTextures(1)
self.gl_texture_type = {2: GL_TEXTURE_2D, 3: GL_TEXTURE_3D}.get(self.lattice.descriptor.d)
glBindTexture(self.gl_texture_type, self.gl_moments)
if self.gl_texture_type == GL_TEXTURE_3D:
glTexImage3D(self.gl_texture_type, 0, GL_RGBA32F, self.lattice.memory.size_x, self.lattice.memory.size_y, self.lattice.memory.size_z, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE)
self.cl_gl_moments = cl.GLTexture(self.lattice.context, mf.READ_WRITE, self.gl_texture_type, 0, self.gl_moments, 3)
elif self.gl_texture_type == GL_TEXTURE_2D:
glTexImage2D(self.gl_texture_type, 0, GL_RGBA32F, self.lattice.memory.size_x, self.lattice.memory.size_y, 0, GL_RGBA, GL_FLOAT, self.gl_texture_buffer)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(self.gl_texture_type, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
glTexParameteri(self.gl_texture_type, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
self.cl_gl_moments = cl.GLTexture(self.lattice.context, mf.READ_WRITE, self.gl_texture_type, 0, self.gl_moments, 2)
self.build_kernel()
def build_kernel(self):
program_src = Template(filename = str(Path(__file__).parent/'../template/opengl.mako')).render(
descriptor = self.lattice.descriptor,
geometry = self.lattice.geometry,
memory = self.lattice.memory,
moments_subexpr = self.lattice.moments[0],
moments_assignment = self.lattice.moments[1],
collide_subexpr = self.lattice.collide[0],
collide_assignment = self.lattice.collide[1],
float_type = self.lattice.float_type[1],
ccode = sympy.ccode
)
self.program = cl.Program(self.lattice.context, program_src).build(self.lattice.compiler_args)
def bind(self, location = GL_TEXTURE0):
glEnable(self.gl_texture_type)
glActiveTexture(location);
glBindTexture(self.gl_texture_type, self.gl_moments)
def collect_moments_from_pop_to_texture(self, population):
if self.include_materials:
self.program.collect_gl_moments_and_materials_to_texture(
self.lattice.queue,
self.lattice.grid.size(),
self.lattice.layout,
population,
self.lattice.memory.cl_material,
self.cl_gl_moments)
else:
self.program.collect_gl_moments_to_texture(
self.lattice.queue,
self.lattice.grid.size(),
self.lattice.layout,
population,
self.cl_gl_moments)
def collect(self):
cl.enqueue_acquire_gl_objects(self.lattice.queue, [self.cl_gl_moments])
if self.lattice.tick:
self.collect_moments_from_pop_to_texture(self.lattice.memory.cl_pop_b)
else:
self.collect_moments_from_pop_to_texture(self.lattice.memory.cl_pop_a)
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