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from __future__ import absolute_import
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:
width = 800
height = 600
num_particles = 100000
time_step = .005
mouse_old = {'x': 0., 'y': 0.}
rotate = {'x': 0., 'y': 0., 'z': 0.}
translate = {'x': 0., 'y': 0., 'z': 0.}
initial_translate = {'x': 0., 'y': 0., 'z': -10}
def glut_window(self):
glutInit(sys.argv)
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(self.width, self.height)
glutInitWindowPosition(0, 0)
window = glutCreateWindow("fieldicle")
glutDisplayFunc(self.on_display)
glutMouseFunc(self.on_click)
glutMotionFunc(self.on_mouse_move)
glutTimerFunc(10, self.on_timer, 10)
glViewport(0, 0, self.width, self.height)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(60., self.width / float(self.height), .1, 1000.)
return(window)
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.np_position[:,0] = 10*numpy.random.random_sample((self.num_particles,)) - 5
self.np_position[:,1] = 10*numpy.random.random_sample((self.num_particles,)) - 5
self.np_position[:,2] = 0.
self.np_position[:,3] = 1.
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()
def on_click(self, button, state, x, y):
self.mouse_old['x'] = x
self.mouse_old['y'] = y
def updateField(self, fx, fy, fz):
self.program = cl.Program(self.context, Template(self.kernel).substitute({
'fx': fx,
'fy': fy,
'fz': fz,
'time_step': self.time_step
})).build()
def on_mouse_move(self, x, y):
self.rotate['x'] += (y - self.mouse_old['y']) * .2
self.rotate['y'] += (x - self.mouse_old['x']) * .2
self.mouse_old['x'] = x
self.mouse_old['y'] = y
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()
# Handle mouse transformations
glTranslatef(self.initial_translate['x'], self.initial_translate['y'], self.initial_translate['z'])
glRotatef(self.rotate['x'], 1, 0, 0)
glRotatef(self.rotate['y'], 0, 1, 0)
glTranslatef(self.translate['x'], self.translate['y'], self.translate['z'])
# 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.np_position, self.gl_position, self.gl_color) = self.initial_buffers(self.num_particles)
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.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;
p.z += $fz * $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)',
'fz': '0',
'time_step': self.time_step
})).build()
glutMainLoop()
particleWindow = ParticleWindow()
glfwThread = threading.Thread(target=particleWindow.run)
glfwThread.start()
class ParamWindow(Gtk.Window):
def __init__(self, particleWin):
Gtk.Window.__init__(self, title="Field Parameters")
self.particleWin = particleWin
self.grid = Gtk.Grid()
self.add(self.grid)
self.button = Gtk.Button(label="Update field")
self.button.connect("clicked", self.on_button_clicked)
self.entryFx = Gtk.Entry()
self.entryFy = Gtk.Entry()
self.entryFz = Gtk.Entry()
self.grid.add(self.button)
self.grid.add(self.entryFx)
self.grid.add(self.entryFy)
self.grid.add(self.entryFz)
def on_button_clicked(self, widget):
self.particleWin.updateField(
self.entryFx.get_text(),
self.entryFy.get_text(),
self.entryFz.get_text()
)
paramWindow = ParamWindow(particleWindow)
paramWindow.connect("destroy", Gtk.main_quit)
paramWindow.show_all()
Gtk.main()
glfwThread.join()
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