33 lines
812 B
Text
33 lines
812 B
Text
shader_type canvas_item;
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const int max_itter = 256;
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const vec2 zoom_center = vec2(-0.74364388703, 0.13182590421);
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int get_mandelbrot_count(vec2 uv, float zoom_factor){
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vec2 scaled_uv = (uv - vec2(0.5)) * 4.0 * zoom_factor + zoom_center;
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float c_re = scaled_uv.x;
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float c_im = scaled_uv.y;
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float re = 0.0;
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float im = 0.0;
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for (int i = 0; i < max_itter; i++){
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float t_re = re;
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re = re*re - im*im + c_re;
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im = 2.0*im*t_re + c_im;
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if (re*re + im*im > 4.0){
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return i;
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}
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}
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return 0;
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}
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void fragment() {
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float smooth_sine = (sin(TIME) * 0.5 + 0.5);
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float zoom_factor = mix(0.001, 1.0, smoothstep(0.0, 1.0, smooth_sine));
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int mandelbrot_count = get_mandelbrot_count(UV, zoom_factor);
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float m_cn = float(mandelbrot_count) / float(max_itter);
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COLOR.rgb = vec3(m_cn, m_cn*2.0, m_cn*3.0);
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}
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