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Diffstat (limited to 'ldc_3d_gl_interop.py')
| -rw-r--r-- | ldc_3d_gl_interop.py | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/ldc_3d_gl_interop.py b/ldc_3d_gl_interop.py new file mode 100644 index 0000000..483ea1a --- /dev/null +++ b/ldc_3d_gl_interop.py @@ -0,0 +1,185 @@ +import numpy +from string import Template + +from simulation import Lattice, Geometry +from utility.particles import Particles +from symbolic.generator import LBM + +import symbolic.D3Q19 as D3Q19 + +from OpenGL.GL import * +from OpenGL.GLUT import * + +from OpenGL.GL import shaders + +from pyrr import matrix44 + +lattice_x = 64 +lattice_y = 32 +lattice_z = 32 + +updates_per_frame = 20 +particle_count = 50000 + +lid_speed = 0.001 +relaxation_time = 0.515 + +def get_cavity_material_map(geometry): + return [ + (lambda x, y, z: x > 0 and x < geometry.size_x-1 and + y > 0 and y < geometry.size_y-1 and + z > 0 and z < geometry.size_z-1, 1), # bulk fluid + (lambda x, y, z: x == 1 or y == 1 or z == 1 or x == geometry.size_x-2 or y == geometry.size_y-2, 2), # walls + (lambda x, y, z: z == geometry.size_z-2, 3), # lid + (lambda x, y, z: x == 0 or x == geometry.size_x-1 or + y == 0 or y == geometry.size_y-1 or + z == 0 or z == geometry.size_z-1, 0) # ghost cells + ] + +boundary = """ + if ( m == 2 ) { + u_0 = 0.0; + u_1 = 0.0; + u_2 = 0.0; + } + if ( m == 3 ) { + u_0 = 0.1; + u_1 = 0.0; + u_2 = 0.0; + } +""" + +def get_projection(width, height): + world_width = lattice_x + world_height = world_width / width * height + + projection = matrix44.create_perspective_projection(45.0, width/height, 0.1, 1000.0) + look = matrix44.create_look_at( + eye = [lattice_x/2, -2*lattice_y, lattice_z/2], + target = [lattice_x/2, lattice_y/2, lattice_z/2], + up = [0, 0, 1]) + rotate = matrix44.create_from_axis_rotation(axis=[0,1,0], theta=0.2) + + point_size = 1 + + return numpy.matmul(look, projection), point_size + +def glut_window(fullscreen = False): + glutInit(sys.argv) + glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH) + + if fullscreen: + window = glutEnterGameMode() + else: + glutInitWindowSize(800, 500) + glutInitWindowPosition(0, 0) + window = glutCreateWindow("LBM") + + return window + +lbm = LBM(D3Q19) + +window = glut_window(fullscreen = False) + +vertex_shader = shaders.compileShader(Template(""" +#version 430 + +layout (location=0) in vec4 particles; + +out vec3 color; + +uniform mat4 projection; + +vec3 fire(float x) { + return mix( + vec3(1.0, 1.0, 0.0), + vec3(1.0, 0.0, 0.0), + x + ); +} + +void main() { + gl_Position = projection * vec4( + particles[0], + particles[1], + particles[2], + 1. + ); + + color = fire(1.0-particles[3]); +}""").substitute({}), GL_VERTEX_SHADER) + +fragment_shader = shaders.compileShader(""" +#version 430 + +in vec3 color; + +void main(){ + gl_FragColor = vec4(color.xyz, 0.0); +}""", GL_FRAGMENT_SHADER) + +shader_program = shaders.compileProgram(vertex_shader, fragment_shader) +projection_id = shaders.glGetUniformLocation(shader_program, 'projection') + +lattice = Lattice( + descriptor = D3Q19, + geometry = Geometry(lattice_x, lattice_y, lattice_z), + moments = lbm.moments(optimize = True), + collide = lbm.bgk(f_eq = lbm.equilibrium(), tau = relaxation_time), + boundary_src = boundary, + opengl = True +) + +lattice.apply_material_map( + get_cavity_material_map(lattice.geometry)) +lattice.sync_material() + +particles = Particles( + lattice.context, + lattice.queue, + lattice.memory.float_type, + numpy.mgrid[ + 6*lattice.geometry.size_x//8:7*lattice.geometry.size_x//8:10j, + lattice.geometry.size_y//8:7*lattice.geometry.size_y//8:particle_count/100j, + 6*lattice.geometry.size_z//8:7*lattice.geometry.size_z//8:10j, + ].reshape(3,-1).T) + +def on_display(): + for i in range(0,updates_per_frame): + lattice.evolve() + + lattice.collect_gl_moments() + + for i in range(0,updates_per_frame): + lattice.update_gl_particles(particles, aging = True) + + lattice.sync() + + glClear(GL_COLOR_BUFFER_BIT) + glEnableClientState(GL_VERTEX_ARRAY) + + particles.gl_particles.bind() + + shaders.glUseProgram(shader_program) + glUniformMatrix4fv(projection_id, 1, False, numpy.ascontiguousarray(projection)) + glVertexPointer(4, GL_FLOAT, 0, particles.gl_particles) + glPointSize(point_size) + glEnable(GL_POINT_SMOOTH) + glDrawArrays(GL_POINTS, 0, particles.count) + + glutSwapBuffers() + +def on_reshape(width, height): + global projection, point_size + glViewport(0,0,width,height) + projection, point_size = get_projection(width, height) + +def on_timer(t): + glutTimerFunc(t, on_timer, t) + glutPostRedisplay() + +glutDisplayFunc(on_display) +glutReshapeFunc(on_reshape) +glutTimerFunc(10, on_timer, 10) + +glutMainLoop() |