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39 lines
980 B
39 lines
980 B
void main(void)
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{
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float zoom = float(iMouse.x) / float(iResolution.x);
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float pos_x = ((float(gl_FragCoord.x) / float(iResolution.x)) * 3.5 * zoom) - (2.5 - (1.0 - zoom));
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float pos_y = ((float(gl_FragCoord.y) / float(iResolution.y)) * 2.0 * zoom) - (1.0 - (1.0 - zoom));
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float x = 0.0;
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float y = 0.0;
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int iteration = 0;
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float normal_iter = 0.0;
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int max_iteration = 255;
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float xtemp;
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while (iteration < max_iteration)
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{
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xtemp = x * x - y * y + pos_x;
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y = 2.0 * x * y + pos_y;
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if ((x * x) + (y * y) >= (4.0)) break;
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x = xtemp;
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iteration++;
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}
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if (iteration >= max_iteration)
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{
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gl_FragColor = vec4(0.0,0.0,0.0,1.0);
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}
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else if (iteration < 128)
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{
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normal_iter = float(iteration) / 255.0;
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gl_FragColor = vec4(0,0.1 + normal_iter,normal_iter,1.0);
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}
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else
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{
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normal_iter = float(iteration) / 255.0;
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gl_FragColor = vec4(1.0 - normal_iter, 1.0, 1.0 - normal_iter, 1.0);
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}
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}
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