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import numpy as np
import moderngl
from _example import Example
class Fractal(Example):
title = "Julia Fractal"
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
in vec2 in_vert;
out vec2 v_text;
void main() {
gl_Position = vec4(in_vert, 0.0, 1.0);
v_text = in_vert / 2.0 + 0.5;
}
''',
fragment_shader='''
#version 330
in vec2 v_text;
out vec4 f_color;
uniform vec2 Center;
uniform int Iter;
void main() {
vec2 z = vec2(5.0 * (v_text.x - 0.5), 3.0 * (v_text.y - 0.5));
vec2 c = Center;
int i;
for(i = 0; i < Iter; i++) {
vec2 v = vec2(
(z.x * z.x - z.y * z.y) + c.x,
(z.y * z.x + z.x * z.y) + c.y
);
if (dot(v, v) > 4.0) break;
z = v;
}
float cm = fract((i == Iter ? 0.0 : float(i)) * 10 / Iter);
f_color = vec4(
fract(cm + 0.0 / 3.0),
fract(cm + 1.0 / 3.0),
fract(cm + 2.0 / 3.0),
1.0
);
}
''',
)
self.center = self.prog['Center']
self.iter = self.prog['Iter']
vertices = np.array([-1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0])
self.vbo = self.ctx.buffer(vertices.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.center.value = (0.49, 0.32)
self.iter.value = 100
self.vao.render(moderngl.TRIANGLE_STRIP)
if __name__ == '__main__':
Fractal.run()
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