39 lines
No EOL
1 KiB
GLSL
39 lines
No EOL
1 KiB
GLSL
uniform vec2 resolution;
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uniform float time;
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float rand(vec2 n) {
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return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
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}
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float line(float p, float x, float glow) {
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return 1. - pow(abs(p - x), glow);
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}
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float grid(vec2 uv) {
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float glow = 0.05;
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float c = line(uv.x, 0.25, glow) + line(uv.x, 0.75, glow)
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+ line(uv.x, 0.5, glow)
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+ line(uv.x, 0.25, glow) + line(uv.x, 1.0, glow)
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+ line(uv.y, 0.25, glow) + line(uv.y, 0.75, glow)
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+ line(uv.y, 0.5, glow)
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+ line(uv.y, 0.25, glow) + line(uv.y, 1.0, glow);
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return c;
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}
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void main(void) {
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vec2 umuv = (gl_FragCoord.xy / resolution.xy - .5) * 2.;
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vec2 uv = umuv;
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float z = (abs(uv.y ) * .8 + 3.);
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uv.y *= 3.;
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uv /= z*0.25;
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float clampfinite = abs(clamp(umuv.y, -1., 0.)) * pow(z, 1. / 10.);
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uv.y += abs(time * 0.1);
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float grain = (0.8 + 0.2 * rand(umuv + time));
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vec4 color = vec4(255, 120, 153, 255) / 255.;
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gl_FragColor = (grid(fract(uv))) * grain * color * clampfinite;
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} |