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import numpy as np
from pyrr import Matrix44
import moderngl
from _example import Example
def grid(size, steps):
u = np.repeat(np.linspace(-size, size, steps), 2)
v = np.tile([-size, size], steps)
w = np.zeros(steps * 2)
return np.concatenate([np.dstack([u, v, w]), np.dstack([v, u, w])])
class SimpleGrid(Example):
title = "Simple Grid"
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
uniform mat4 Mvp;
in vec3 in_vert;
void main() {
gl_Position = Mvp * vec4(in_vert, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 f_color;
void main() {
f_color = vec4(0.1, 0.1, 0.1, 1.0);
}
''',
)
self.mvp = self.prog['Mvp']
self.vbo = self.ctx.buffer(grid(15, 10).astype('f4'))
self.vao = self.ctx.simple_vertex_array(self.prog, self.vbo, 'in_vert')
def render(self, time, frame_time):
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.DEPTH_TEST)
proj = Matrix44.perspective_projection(45.0, self.aspect_ratio, 0.1, 1000.0)
lookat = Matrix44.look_at(
(40.0, 30.0, 30.0),
(0.0, 0.0, 0.0),
(0.0, 0.0, 1.0),
)
self.mvp.write((proj * lookat).astype('f4'))
self.vao.render(moderngl.LINES)
if __name__ == '__main__':
SimpleGrid.run()
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