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lbm.py
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lbm.py
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import sys
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GL.ARB import *
from OpenGL.GL.EXT import *
import pycuda.autoinit
import pycuda.driver as cuda_driver
import pycuda.gl as cuda_gl
import pycuda.gpuarray as cuda_garr
import math as m
import numpy as np
import random as rnd
import shaders as sh
from drawable import Drawable
class LBM( Drawable ) :
BOX = int(23)
NUM = BOX**3
D = int(3)
Q = int(19)
TAU = 0.5
BALLSIZE = 15
def __init__( self ) :
self.f = np.zeros( (self.BOX,self.BOX,self.BOX,self.Q), np.float32 )
self.pos = np.zeros( (self.BOX,self.BOX,self.BOX,4), np.float32 )
self._init_ball( self.BALLSIZE )
self._init_pos()
self.gpos = None
def _init_ball( self , p ) :
b2 = self.BOX / 2.0
for x in range(self.BOX) :
for y in range(self.BOX) :
for z in range(self.BOX) :
for w in range(self.Q) :
self.f[x,y,z,w] = 0
if (x-b2)**2 + (y-b2)**2 + (z-b2)**2 < p :
self.f[x,y,z,0] = .1
def _init_pos( self ) :
b2 = self.BOX / 2.0
for x in range(self.BOX) :
for y in range(self.BOX) :
for z in range(self.BOX) :
self.pos[x,y,z] = np.array((x-b2,y-b2,z-b2,self.f[x,y,z,0]),np.float32)
def set_borders( self , b ) :
self.borders = np.array( b , np.float32 )
def draw( self ) :
self.draw_balls()
def draw_pts( self ) :
glPointSize( 5 )
glColor3f(1,0,0)
glEnableClientState(GL_VERTEX_ARRAY)
glBindBuffer( GL_ARRAY_BUFFER , self.gpos )
glVertexPointer( 4 , GL_FLOAT , 0 , None )
glBindBuffer( GL_ARRAY_BUFFER , 0 )
glDrawArrays( GL_POINTS , 0 , self.NUM )
glDisableClientState(GL_VERTEX_ARRAY)
def draw_balls( self ) :
glPointSize( 5 )
glPushMatrix()
glAlphaFunc( GL_GREATER , 0.1 );
glEnable( GL_ALPHA_TEST )
glUseProgram( self.prog )
mmv = glGetFloatv(GL_MODELVIEW_MATRIX)
mp = glGetFloatv(GL_PROJECTION_MATRIX)
glUniformMatrix4fv(self.loc_mmv,1,GL_FALSE,mmv)
glUniformMatrix4fv(self.loc_mp ,1,GL_FALSE,mp )
glUniform4f(self.l_color , 1 , .5 , 0 , 1 )
glUniform1f(self.l_size , 1.5 )
glEnableClientState(GL_VERTEX_ARRAY)
glBindBuffer( GL_ARRAY_BUFFER , self.gpos )
glVertexPointer( 4 , GL_FLOAT , 0 , None )
glBindBuffer( GL_ARRAY_BUFFER , 0 )
glDrawArrays( GL_POINTS , 0 , self.NUM )
glDisableClientState(GL_VERTEX_ARRAY)
glDisable( GL_ALPHA_TEST )
glUseProgram( 0 )
glPopMatrix()
def gfx_init( self ) :
try :
print 'compiling'
self.prog = sh.compile_program_vfg( 'shad/balls' )
print 'compiled'
self.loc_mmv = sh.get_loc(self.prog,'modelview' )
self.loc_mp = sh.get_loc(self.prog,'projection')
self.l_color = sh.get_loc(self.prog,'color' )
self.l_size = sh.get_loc(self.prog,'ballsize' )
except ValueError as ve :
print "Shader compilation failed: " + str(ve)
sys.exit(0)
# glUseProgram( self.prog )
# glUniform1i( pointsid , 0 );
# glUseProgram( 0 )
#
# cuda init
#
self.grid = (int(self.BOX),int(self.BOX))
self.block = (1,1,int(self.BOX))
print 'CUDA: block %s , grid %s' % (str(self.block),str(self.grid))
# print cuda_driver.device_attribute.MAX_THREADS_PER_BLOCK
# print cuda_driver.device_attribute.MAX_BLOCK_DIM_X
# print cuda_driver.device_attribute.MAX_BLOCK_DIM_Y
# print cuda_driver.device_attribute.MAX_BLOCK_DIM_Z
floatbytes = np.dtype(np.float32).itemsize
self.gpos = glGenBuffers(1)
glBindBuffer( GL_ARRAY_BUFFER , self.gpos )
glBufferData( GL_ARRAY_BUFFER , self.pos.nbytes, self.pos, GL_STREAM_DRAW )
glBindBuffer( GL_ARRAY_BUFFER , 0 )
self.df1 = cuda_driver.mem_alloc( self.f.nbytes )
self.df2 = cuda_driver.mem_alloc( self.f.nbytes )
cuda_driver.memcpy_htod( self.df1 , self.f )
cuda_driver.memset_d32( self.df2 , 0 , self.NUM*self.Q )
mod = cuda_driver.module_from_file( 'lbm_kernel.cubin' )
self.collision = mod.get_function("collision_step")
self.collision.prepare( "Piii" )
self.streaming = mod.get_function("streaming_step")
self.streaming.prepare( "PPiii" )
self.colors = mod.get_function("colors")
self.colors.prepare( "PPiii" )
def wave( self , dt ) :
self.wave_cu( dt )
def wave_cu( self , dt ) :
mpos = cuda_gl.BufferObject( long( self.gpos ) )
dpos = mpos.map()
# self._debug_print()
self.collision.prepared_call( self.grid , self.block ,
self.df1 , self.BOX , self.BOX , self.BOX )
# self._debug_print()
self.streaming.prepared_call( self.grid , self.block ,
self.df1 , self.df2 , self.BOX , self.BOX , self.BOX )
cuda_driver.memcpy_dtod( self.df1 , self.df2 , self.f.nbytes )
self.colors.prepared_call( self.grid , self.block ,
dpos.device_ptr() , self.df1 , self.BOX , self.BOX , self.BOX )
dpos.unmap()
mpos.unregister()
def _debug_print( self ) :
cuda_driver.memcpy_dtoh( self.f , self.df1 )
np.set_printoptions( 3 , 10000 , linewidth = 200 , suppress = True )
print '#'*80
print self.f