From 67c063fda67a4b6379b40a5c41ddba9eec3329ad Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 14 Sep 2019 11:57:44 +0200
Subject: Draw 3d geometry outline

---
 ldc_3d_gl_interop.py | 66 +++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 53 insertions(+), 13 deletions(-)

diff --git a/ldc_3d_gl_interop.py b/ldc_3d_gl_interop.py
index 483ea1a..7fb5d5c 100644
--- a/ldc_3d_gl_interop.py
+++ b/ldc_3d_gl_interop.py
@@ -15,11 +15,11 @@ from OpenGL.GL import shaders
 from pyrr import matrix44
 
 lattice_x = 64
-lattice_y = 32
-lattice_z = 32
+lattice_y = 64
+lattice_z = 64
 
 updates_per_frame = 20
-particle_count = 50000
+particle_count = 10000
 
 lid_speed = 0.001
 relaxation_time = 0.515
@@ -55,7 +55,7 @@ def get_projection(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],
+        eye    = [lattice_x/2, -2*lattice_y, 1.2*lattice_z],
         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)
@@ -81,12 +81,11 @@ lbm = LBM(D3Q19)
 
 window = glut_window(fullscreen = False)
 
-vertex_shader = shaders.compileShader(Template("""
+particle_shader = shaders.compileShader(Template("""
 #version 430
 
 layout (location=0) in vec4 particles;
-
-out vec3 color;
+                   out vec3 color;
 
 uniform mat4 projection;
 
@@ -109,6 +108,19 @@ void main() {
     color = fire(1.0-particles[3]);
 }""").substitute({}), GL_VERTEX_SHADER)
 
+vertex_shader = shaders.compileShader(Template("""
+#version 430
+
+layout (location=0) in vec4 vertex;
+                   out vec3 color;
+
+uniform mat4 projection;
+
+void main() {
+    gl_Position = projection * vertex;
+    color = vec3(1.0,1.0,1.0);
+}""").substitute({}), GL_VERTEX_SHADER)
+
 fragment_shader = shaders.compileShader("""
 #version 430
 
@@ -118,8 +130,10 @@ 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')
+particle_program = shaders.compileProgram(particle_shader, fragment_shader)
+projection_id = shaders.glGetUniformLocation(particle_program, 'projection')
+
+geometry_program = shaders.compileProgram(vertex_shader, fragment_shader)
 
 lattice = Lattice(
     descriptor   = D3Q19,
@@ -139,9 +153,9 @@ particles = Particles(
     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,
+        8*lattice.geometry.size_x//10:9*lattice.geometry.size_x//10:10j,
+        lattice.geometry.size_y//10:9*lattice.geometry.size_y//10:particle_count/100j,
+        8*lattice.geometry.size_z//10:9*lattice.geometry.size_z//10:10j,
     ].reshape(3,-1).T)
 
 def on_display():
@@ -160,13 +174,39 @@ def on_display():
 
     particles.gl_particles.bind()
 
-    shaders.glUseProgram(shader_program)
+    shaders.glUseProgram(particle_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)
 
+    shaders.glUseProgram(geometry_program)
+    glUniformMatrix4fv(projection_id, 1, False, numpy.ascontiguousarray(projection))
+    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
+    glBegin(GL_POLYGON)
+    glVertex3f(0,0,0)
+    glVertex3f(lattice_x,0,0)
+    glVertex3f(lattice_x,lattice_y,0)
+    glVertex3f(0,lattice_y,0)
+    glEnd()
+    glBegin(GL_POLYGON)
+    glVertex3f(0,0,lattice_z)
+    glVertex3f(lattice_x,0,lattice_z)
+    glVertex3f(lattice_x,lattice_y,lattice_z)
+    glVertex3f(0,lattice_y,lattice_z)
+    glEnd()
+    glBegin(GL_LINES)
+    glVertex3f(0,0,0)
+    glVertex3f(0,0,lattice_z)
+    glVertex3f(lattice_x,0,0)
+    glVertex3f(lattice_x,0,lattice_z)
+    glVertex3f(lattice_x,lattice_y,0)
+    glVertex3f(lattice_x,lattice_y,lattice_z)
+    glVertex3f(0,lattice_y,0)
+    glVertex3f(0,lattice_y,lattice_z)
+    glEnd()
+
     glutSwapBuffers()
 
 def on_reshape(width, height):
-- 
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