41 lines
No EOL
721 B
GLSL
41 lines
No EOL
721 B
GLSL
// This source code is property of the Computer Graphics and Visualization
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// chair of the TU Dresden. Do not distribute!
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// Copyright (C) CGV TU Dresden - All Rights Reserved
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#version 130
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in vec4 fragment_color;
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in vec2 vertex_pos;
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in vec2 julia_position;
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out vec4 color;
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uniform float m;
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uniform vec2 c;
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const int i_max = 200;
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void main()
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{
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vec2 z = julia_position * m;
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int i;
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for(i = 0; i < i_max; i++) {
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float x = (z.x * z.x - z.y * z.y) + c.x;
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float y = (z.y * z.x + z.x * z.y) + c.y;
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if ((x*x + y*y) > 4.0) {
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break;
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}
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z.x = x;
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z.y = y;
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}
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float alpha = 0.0;
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if (i < i_max) {
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alpha = float(i) / float(i_max);
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}
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color = vec4(alpha, alpha, alpha, alpha) * 10.0 * fragment_color;
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} |