From dfcb729ff162aba45e3d83acf864fe1ff92e5a06 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Thu, 20 Jun 2019 15:43:58 +0200
Subject: Prototype OpenGL interoperation

---
 ldc_2d_gl_interop.py | 98 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 ldc_2d_gl_interop.py

(limited to 'ldc_2d_gl_interop.py')

diff --git a/ldc_2d_gl_interop.py b/ldc_2d_gl_interop.py
new file mode 100644
index 0000000..6ff10c7
--- /dev/null
+++ b/ldc_2d_gl_interop.py
@@ -0,0 +1,98 @@
+import numpy
+import time
+
+from simulation         import Lattice, Geometry
+from symbolic.generator import LBM
+
+import symbolic.D2Q9 as D2Q9
+
+from OpenGL.GL   import *
+from OpenGL.GLUT import *
+
+screen_x = 1920
+screen_y = 1200
+
+def cavity(geometry, x, y):
+    if x == 1 or y == 1 or x == geometry.size_x-2:
+        return 2
+    elif y == geometry.size_y-2:
+        return 3
+    else:
+        return 1
+
+boundary = """
+    if ( m == 2 ) {
+        u_0 = 0.0;
+        u_1 = 0.0;
+    }
+    if ( m == 3 ) {
+        u_0 = 0.1;
+        u_1 = 0.0;
+    }
+"""
+
+def glut_window(fullscreen = False):
+    glutInit(sys.argv)
+    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
+
+    if fullscreen:
+        window = glutEnterGameMode()
+    else:
+        glutInitWindowSize(screen_x, screen_y)
+        glutInitWindowPosition(0, 0)
+        window = glutCreateWindow("LBM")
+
+    glMatrixMode(GL_PROJECTION)
+    glLoadIdentity()
+
+    glOrtho(
+        0, screen_x,
+        0, screen_y,
+        0.1, 100.0
+    )
+
+    return window
+
+lbm = LBM(D2Q9)
+
+window = glut_window(fullscreen = False)
+
+lattice = Lattice(
+    descriptor   = D2Q9,
+    geometry     = Geometry(screen_x//4, screen_y//4),
+    moments      = lbm.moments(optimize = False),
+    collide      = lbm.bgk(f_eq = lbm.equilibrium(), tau = 0.52),
+    boundary_src = boundary,
+    opengl       = True
+)
+
+lattice.setup_geometry(cavity)
+
+def on_display():
+    for i in range(0,100):
+        lattice.evolve()
+
+    lattice.sync_gl_moments()
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
+    glMatrixMode(GL_MODELVIEW)
+    glLoadIdentity()
+
+    glTranslatef(0., 0., -1.)
+
+    lattice.gl_moments.bind()
+    glEnableClientState(GL_VERTEX_ARRAY)
+    glVertexPointer(4, GL_FLOAT, 0, lattice.gl_moments)
+    glDrawArrays(GL_POINTS, 0, lattice.geometry.volume)
+    glDisableClientState(GL_VERTEX_ARRAY)
+
+    glutSwapBuffers()
+
+def on_timer(t):
+    glutTimerFunc(t, on_timer, t)
+    glutPostRedisplay()
+
+glutDisplayFunc(on_display)
+glutTimerFunc(10, on_timer, 10)
+
+glutMainLoop()
-- 
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