38 lines
1.2 KiB
GLSL
38 lines
1.2 KiB
GLSL
#define PI 3.1415926538
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void mainImage(out vec4 fragColor, in vec2 fragCoord) {
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vec2 uv = fragCoord / iResolution;
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vec2 lines_uv = uv;
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// twist?
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// distance from middle
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float distance = distance(uv, vec2(0.5, 0.5));
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float inverse_distance = 1.0 - distance;
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float inverse_distance_magnified = inverse_distance*inverse_distance;
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//lines_uv += (lines_uv - vec2(0.5, 0.5)) * inverse_distance * 3.0;
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float rot = PI * (inverse_distance_magnified);
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mat2x2 rotm = mat2x2(
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cos(rot), -sin(rot),
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sin(rot), cos(rot)
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);
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lines_uv *= rotm;
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// The lines themselves
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float lines_timescale = iTime * 0.6;
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//lines_uv.x += lines_timescale * 0.02;
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lines_uv.y += sin(lines_timescale * 0.2 + lines_uv.x * 5.0) * 0.2;
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lines_uv.x += sin(lines_timescale + lines_uv.y * 30.0) * 0.2;// * sin(lines_timescale);
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float hor_lines = sin(lines_uv.x * 10.0)/2.0 + 0.5;
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float extra_hor_lines = hor_lines;
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// clipped with AA
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hor_lines = extra_hor_lines; //sign(hor_lines -0.5);
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//hor_lines = sin(iTime * 3.0 +hor_lines * 2.0 + uv.y / 50.0);
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//fragColor = vec4(uv.x, uv.y, 1.0, 1.0);
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float frac = 0.50;
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fragColor = vec4(hor_lines * frac, hor_lines * frac, hor_lines * frac + 0.4, 1.0);
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}
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