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import numpy as np
import moderngl
from _example import Example
class Fractal(Example):
title = "Julia Set"
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;
}
''',
fragment_shader='''
#version 330
in vec2 v_text;
out vec4 f_color;
uniform sampler2D Texture;
uniform vec2 Seed;
uniform int Iter;
void main() {
vec2 c = Seed;
int i;
vec2 z = vec2(3.0 * v_text.x, 2.0 * v_text.y);
for (i = 0; i < Iter; i++) {
float x = (z.x * z.x - z.y * z.y) + c.x;
float y = (z.y * z.x + z.x * z.y) + c.y;
if ((x * x + y * y) > 4.0) {
break;
}
z.x = x;
z.y = y;
}
f_color = texture(Texture, vec2((i == Iter ? 0.0 : float(i)) / 100.0, 0.0));
}
''',
)
self.seed = self.prog['Seed']
self.iter = self.prog['Iter']
self.texture = self.load_texture_2d('pal.png')
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.seed.value = (-0.8, 0.156)
self.iter.value = 100
self.texture.use()
self.vao.render(moderngl.TRIANGLE_STRIP)
if __name__ == '__main__':
Fractal.run()
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