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import pyopencl as cl
mf = cl.mem_flags
from pyopencl.tools import get_gl_sharing_context_properties
from string import Template
from OpenGL.GL import * # OpenGL - GPU rendering interface
from OpenGL.GLU import * # OpenGL tools (mipmaps, NURBS, perspective projection, shapes)
from OpenGL.GLUT import * # OpenGL tool to make a visualization window
from OpenGL.arrays import vbo
import numpy
import threading
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
class ParticleWindow:
window_width = 500
window_height = 500
world_width = 20.
world_height = 20.
num_particles = 100000
time_step = .005
gtk_active = False
def glut_window(self):
glutInit(sys.argv)
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(self.window_width, self.window_height)
glutInitWindowPosition(0, 0)
window = glutCreateWindow("fieldicle")
glutDisplayFunc(self.on_display)
glutSpecialFunc(self.on_keyboard)
glutTimerFunc(5, self.on_timer, 5)
glutReshapeFunc(self.on_window_resize)
glViewport(0, 0, self.window_width, self.window_height)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(
-(self.world_width/2), self.world_width/2,
-(self.world_height/2), self.world_height/2,
0.1, 100.0
)
return(window)
def on_keyboard(self, key, x, y):
if key == GLUT_KEY_F1:
self.gtk_active = True
ParamWindow(self).show_all()
def initial_buffers(self, num_particles):
self.np_position = numpy.ndarray((self.num_particles, 4), dtype=numpy.float32)
self.np_color = numpy.ndarray((num_particles, 4), dtype=numpy.float32)
self.set_particle_start_positions()
self.np_color[:,:] = [1.,1.,1.,1.]
self.np_color[:,3] = numpy.random.random_sample((self.num_particles,))
self.gl_position = vbo.VBO(data=self.np_position, usage=GL_DYNAMIC_DRAW, target=GL_ARRAY_BUFFER)
self.gl_position.bind()
self.gl_color = vbo.VBO(data=self.np_color, usage=GL_DYNAMIC_DRAW, target=GL_ARRAY_BUFFER)
self.gl_color.bind()
return (self.np_position, self.gl_position, self.gl_color)
def on_timer(self, t):
glutTimerFunc(t, self.on_timer, t)
glutPostRedisplay()
if self.gtk_active:
Gtk.main_iteration_do(False)
def set_particle_start_positions(self):
self.np_position[:,0] = self.world_width * numpy.random.random_sample((self.num_particles,)) - (self.world_width/2)
self.np_position[:,1] = self.world_height * numpy.random.random_sample((self.num_particles,)) - (self.world_height/2)
self.np_position[:,2] = 0.
self.np_position[:,3] = 1.
self.cl_start_position = cl.Buffer(self.context, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=self.np_position)
def on_window_resize(self, width, height):
self.window_width = width
self.window_height = height
self.world_height = self.world_width / self.window_width * self.window_height;
glViewport(0, 0, self.window_width, self.window_height)
glLoadIdentity()
glOrtho(
-(self.world_width/2), self.world_width/2,
-(self.world_height/2), self.world_height/2,
0.1, 100.0
)
self.set_particle_start_positions()
def update_field(self, fx, fy):
self.program = cl.Program(self.context, Template(self.kernel).substitute({
'fx': fx,
'fy': fy,
'time_step': self.time_step
})).build()
def on_display(self):
# Update or particle positions by calling the OpenCL kernel
cl.enqueue_acquire_gl_objects(self.queue, [self.cl_gl_position, self.cl_gl_color])
kernelargs = (self.cl_gl_position, self.cl_gl_color, self.cl_start_position)
self.program.update_particles(self.queue, (self.num_particles,), None, *(kernelargs))
cl.enqueue_release_gl_objects(self.queue, [self.cl_gl_position, self.cl_gl_color])
self.queue.finish()
glFlush()
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslatef(0., 0., -1.)
# Render the particles
glEnable(GL_POINT_SMOOTH)
glPointSize(1)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
# Set up the VBOs
self.gl_color.bind()
glColorPointer(4, GL_FLOAT, 0, self.gl_color)
self.gl_position.bind()
glVertexPointer(4, GL_FLOAT, 0, self.gl_position)
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_COLOR_ARRAY)
# Draw the VBOs
glDrawArrays(GL_POINTS, 0, self.num_particles)
glDisableClientState(GL_COLOR_ARRAY)
glDisableClientState(GL_VERTEX_ARRAY)
glDisable(GL_BLEND)
glutSwapBuffers()
def run(self):
self.window = self.glut_window()
self.platform = cl.get_platforms()[0]
self.context = cl.Context(properties=[(cl.context_properties.PLATFORM, self.platform)] + get_gl_sharing_context_properties())
self.queue = cl.CommandQueue(self.context)
(self.np_position, self.gl_position, self.gl_color) = self.initial_buffers(self.num_particles)
self.cl_start_position = cl.Buffer(self.context, mf.READ_ONLY | mf.COPY_HOST_PTR, hostbuf=self.np_position)
self.cl_gl_position = cl.GLBuffer(self.context, mf.READ_WRITE, int(self.gl_position))
self.cl_gl_color = cl.GLBuffer(self.context, mf.READ_WRITE, int(self.gl_color))
self.kernel = """__kernel void update_particles(__global float4* position,
__global float4* color,
__global float4* start_position)
{
unsigned int i = get_global_id(0);
float4 p = position[i];
float life = color[i].w;
life -= $time_step;
if (life <= 0.f) {
p = start_position[i];
life = 1.0f;
}
p.x += ($fx) * $time_step;
p.y += ($fy) * $time_step;
position[i] = p;
color[i].w = life;
}"""
self.program = cl.Program(self.context, Template(self.kernel).substitute({
'fx': 'cos(p.x)',
'fy': 'sin(p.y*p.x)',
'time_step': self.time_step
})).build()
glutMainLoop()
particleWindow = ParticleWindow()
glfwThread = threading.Thread(target=particleWindow.run)
glfwThread.start()
class ParamWindow(Gtk.Dialog):
def __init__(self, particleWin):
Gtk.Dialog.__init__(self, title="Field Parameters")
self.particleWin = particleWin
self.updateBtn = Gtk.Button(label="Update field")
self.updateBtn.connect("clicked", self.on_update_clicked)
self.entryFx = Gtk.Entry()
self.entryFx.set_text("cos(p.x)")
self.entryFy = Gtk.Entry()
self.entryFy.set_text("sin(p.y*p.x)")
layout = self.get_content_area()
layout.add(self.entryFx)
layout.add(self.entryFy)
layout.add(self.updateBtn)
def on_update_clicked(self, widget):
self.particleWin.update_field(
self.entryFx.get_text(),
self.entryFy.get_text()
)
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