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from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GL import shaders
from pyrr import matrix44
import numpy as np
from particles import GasFlow, HardSphereSetup, grid_of_random_velocity_particles
glutInit()
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowPosition(0, 0)
window = glutCreateWindow("gas")
class Shader:
def __init__(self, vertex_src, fragment_src, uniform):
self.program = shaders.compileProgram(
shaders.compileShader(vertex_src, GL_VERTEX_SHADER),
shaders.compileShader(fragment_src, GL_FRAGMENT_SHADER))
self.uniform = { }
for name in uniform:
self.uniform[name] = shaders.glGetUniformLocation(self.program, name)
def use(self):
shaders.glUseProgram(self.program)
particle_shader = Shader(
fragment_src = """
#version 430
in vec3 color;
void main(){
if (length(gl_PointCoord - vec2(0.5)) > 0.5) {
discard;
}
gl_FragColor = vec4(color.xyz, 0.0);
}""",
vertex_src = """
#version 430
layout (location=0) in vec2 particles;
out vec3 color;
uniform mat4 projection;
void main() {
gl_Position = projection * vec4(particles, 0., 1.);
color = vec3(0.0);
}""",
uniform = ['projection']
)
decoration_shader = Shader(
fragment_src = """
#version 430
in vec3 color;
void main(){
gl_FragColor = vec4(color.xyz, 0.0);
}""",
vertex_src = """
#version 430
in vec3 vertex;
out vec3 color;
uniform mat4 projection;
uniform vec3 face_color;
void main() {
gl_Position = projection * vec4(vertex, 1.);
color = face_color;
}""",
uniform = ['projection', 'face_color']
)
class View:
def __init__(self, gas, decorations):
self.gas = gas
self.decorations = decorations
def reshape(self, width, height):
glViewport(0,0,width,height)
world_height = 1.0
world_width = world_height / height * width
projection = matrix44.create_orthogonal_projection(-world_width/2, world_width/2, -world_height/2, world_height/2, -1, 1)
translation = matrix44.create_from_translation([-1.0/2, -1.0/2, 0])
self.pixels_per_unit = height / world_height
self.projection = np.matmul(translation, projection)
def display(self):
glClearColor(0.4,0.4,0.4,1.)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
decoration_shader.use()
glUniformMatrix4fv(decoration_shader.uniform['projection'], 1, False, np.asfortranarray(self.projection))
for decoration in self.decorations:
decoration.display(decoration_shader.uniform)
particle_shader.use()
glUniformMatrix4fv(particle_shader.uniform['projection'], 1, False, np.asfortranarray(self.projection))
glEnable(GL_POINT_SPRITE)
glPointSize(2*radius*self.pixels_per_unit)
self.gas.gl_draw_particles()
glutSwapBuffers()
class Tracer:
def __init__(self, gas, iParticle):
self.gas = gas
self.iParticle = iParticle
self.trace = [ ]
def update(self):
position = self.gas.get_positions()[self.iParticle]
self.trace.append((position[0], position[1]))
def display(self, uniform):
glUniform3f(uniform['face_color'], 1., 0., 0.)
glLineWidth(2)
glBegin(GL_LINE_STRIP)
for v in self.trace:
glVertex(*v, 0.)
glEnd()
class ColoredBox:
def __init__(self, origin, extend, color):
self.origin = origin
self.extend = extend
self.color = color
def display(self, uniform):
glUniform3f(uniform['face_color'], *self.color)
glBegin(GL_TRIANGLE_STRIP)
glVertex(self.origin[0], self.origin[1] , 0.)
glVertex(self.origin[0] + self.extend[0], self.origin[1] , 0.)
glVertex(self.origin[0] , self.origin[1] + self.extend[1], 0.)
glVertex(self.origin[0] + self.extend[1], self.origin[1] + self.extend[1], 0.)
glEnd()
grid_width = 30
radius = 0.002
char_u = 1120
position, velocity = grid_of_random_velocity_particles(grid_width, radius, char_u)
velocity[:,:] = 0
velocity[0,0] = 10*char_u
velocity[0,1] = 1*char_u
config = HardSphereSetup(radius, char_u, position, velocity)
gas = GasFlow(config, opengl = True, t_scale = 1.0)
tracer = Tracer(gas, 5)
view = View(gas, [ColoredBox([0,0], [1,1], (1,1,1)), tracer])
def on_display():
for i in range(0,10):
gas.evolve()
tracer.update()
view.display()
def on_reshape(width, height):
view.reshape(width, height)
def on_timer(t):
glutTimerFunc(t, on_timer, t)
glutPostRedisplay()
glutDisplayFunc(on_display)
glutReshapeFunc(on_reshape)
glutTimerFunc(10, on_timer, 10)
glutMainLoop()
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