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from OpenGL.GL import *
from OpenGL.GLUT import *
from pyrr import matrix44
import numpy as np
from .shader import Shader, GeometryShader
from .camera import Projection, Rotation, MouseDragMonitor, MouseScrollMonitor
particle_shader = (
"""
#version 430
in vec3 particle_pos;
uniform vec4 camera_pos;
in GS_OUT
{
vec3 particle_pos;
vec2 tex_coord;
} fs_in;
void main(){
if (length(fs_in.tex_coord - vec2(0.5)) > 0.5) {
discard;
}
vec3 n = vec3(fs_in.tex_coord - vec2(0.5), 0.);
n.z = -sqrt(1.0 - length(n));
n = normalize(n);
vec3 dir = normalize(camera_pos.xyz - fs_in.particle_pos);
vec3 color = vec3(1.) * max(0., dot(dir, n));
gl_FragColor = vec4(color.xyz, 1.0);
}
""",
"""
#version 430
layout (points) in;
layout (triangle_strip, max_vertices=4) out;
out GS_OUT
{
vec3 particle_pos;
vec2 tex_coord;
} gs_out;
uniform mat4 projection;
uniform mat4 rotation;
uniform vec4 camera_pos;
uniform float radius;
vec4 project(vec3 v) {
return projection * rotation * vec4(v, 1.);
}
void emitSquareAt(vec3 position) {
mat4 m = projection * rotation;
vec3 camera_right = normalize(vec3(m[0][0], m[1][0], m[2][0]));
vec3 camera_up = normalize(vec3(m[0][1], m[1][1], m[2][1]));
gs_out.particle_pos = gl_in[0].gl_Position.xyz;
gl_Position = project(position + camera_right * -radius + camera_up * -radius);
gs_out.tex_coord = vec2(0.,0.);
EmitVertex();
gl_Position = project(position + camera_right * radius + camera_up * -radius);
gs_out.tex_coord = vec2(1.,0.);
EmitVertex();
gl_Position = project(position + camera_right * -radius + camera_up * radius);
gs_out.tex_coord = vec2(0.,1.);
EmitVertex();
gl_Position = project(position + camera_right * radius + camera_up * radius);
gs_out.tex_coord = vec2(1.,1.);
EmitVertex();
}
void main() {
emitSquareAt(gl_in[0].gl_Position.xyz);
EndPrimitive();
}
""",
"""
#version 430
layout (location=0) in vec4 particle_pos;
void main() {
gl_Position = vec4(particle_pos.xyz, 1.0);
}
""",
['projection', 'rotation', 'camera_pos', 'radius']
)
decoration_shader = (
"""
#version 430
void main(){
gl_FragColor = vec4(1.);
}
""",
"""
#version 430
layout (location=0) in vec3 vertex;
uniform mat4 projection;
uniform mat4 rotation;
void main() {
gl_Position = projection * rotation * vec4(vertex.xyz, 1.);
}
""",
['projection', 'rotation']
)
texture_shader = (
"""
#version 430
in vec2 tex_coord;
uniform sampler2D picture[2];
uniform float mixing;
void main() {
vec3 color = mix(texture(picture[0], tex_coord), texture(picture[1], tex_coord), mixing).xyz;
if (color == vec3(0.,0.,0.)) {
gl_FragColor = vec4(color, 0.5);
} else {
gl_FragColor = vec4(color, 1.0);
}
}
""",
"""
#version 430
layout (location=0) in vec2 screen_vertex;
layout (location=1) in vec2 texture_vertex;
out vec2 tex_coord;
uniform mat4 projection;
void main() {
gl_Position = projection * vec4(screen_vertex, 0.0, 1.0);
tex_coord = texture_vertex;
}
""",
['picture','projection','mixing']
)
class View:
def __init__(self, gas, instruments):
self.gas = gas
self.instruments = instruments
self.texture_shader = Shader(*texture_shader)
self.particle_shader = GeometryShader(*particle_shader)
self.decoration_shader = Shader(*decoration_shader)
self.camera_projection = Projection(distance = 5)
self.camera_rotation = Rotation([-1/2, -1/2, -1/2], np.pi/2, 0)
self.camera_pos = np.matmul([0,-self.camera_projection.distance,0,1], self.camera_rotation.get_inverse())
self.mouse_monitors = [
MouseDragMonitor(GLUT_LEFT_BUTTON, lambda dx, dy: self.camera_rotation.update(0.005*dy, 0.005*dx)),
MouseDragMonitor(GLUT_RIGHT_BUTTON, lambda dx, dy: self.camera_projection.shift(0.005*dx, 0.005*dy)),
MouseScrollMonitor(lambda zoom: self.camera_projection.update_distance(0.1*zoom))
]
self.show_windows = False
self.show_decorations = True
def reshape(self, width, height):
glViewport(0,0,width,height)
world_height = 1.4
world_width = world_height / height * width
projection = Projection(10)
projection = matrix44.create_orthogonal_projection(-world_width/2, world_width/2, -world_height/2, world_height/2, -1, 1)
translation = matrix44.create_from_translation([-1.05, -1.0/2, 0])
self.camera_projection.update_ratio(width, height)
self.pixels_per_unit = height / world_height
self.projection = np.matmul(translation, projection)
def display(self):
glClearColor(0.,0.,0.,1.)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glEnable(GL_DEPTH_TEST)
glDepthMask(GL_TRUE)
glDepthFunc(GL_LEQUAL)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
self.particle_shader.use()
glUniformMatrix4fv(self.particle_shader.uniform['projection'], 1, False, np.ascontiguousarray(self.camera_projection.get()))
glUniformMatrix4fv(self.particle_shader.uniform['rotation'], 1, False, np.ascontiguousarray(self.camera_rotation.get()))
glUniform4fv(self.particle_shader.uniform['camera_pos'], 1, self.camera_pos)
glUniform1f(self.particle_shader.uniform['radius'], self.gas.radius)
self.gas.gl_draw_particles()
glBindVertexArray(0)
if self.show_decorations:
self.decoration_shader.use()
glUniformMatrix4fv(self.decoration_shader.uniform['projection'], 1, False, np.ascontiguousarray(self.camera_projection.get()))
glUniformMatrix4fv(self.decoration_shader.uniform['rotation'], 1, False, np.ascontiguousarray(self.camera_rotation.get()))
glLineWidth(2)
for instrument in self.instruments:
instrument.display_decoration(self.decoration_shader.uniform)
if self.show_windows:
self.texture_shader.use()
glUniformMatrix4fv(self.texture_shader.uniform['projection'], 1, False, np.asfortranarray(self.projection))
for instrument in self.instruments:
instrument.display_window(self.texture_shader.uniform)
glutSwapBuffers()
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