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https://github.com/DigvijaysinhGohil/Godot-Shader-Lib.git
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19 lines
759 B
Plaintext
19 lines
759 B
Plaintext
vec2 gradient_noise_dir(vec2 p){
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p = vec2(mod(p.x,289.0), mod(p.y, 289.0));
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float x = (34.0 * p.x + 1.0) * mod(p.x, 289.0) + p.y;
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x = (34.0 * x + 1.0) * mod(x, 289.0);
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x = fract(x / 41.0) * 2.0 - 1.0;
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return normalize(vec2(x - floor(x + 0.5), abs(x) - 0.5));
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}
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float gradient_noise(vec2 uv, float scale){
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vec2 p = uv * scale;
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vec2 ip = floor(p);
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vec2 fp = fract(p);
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float d00 = dot(gradient_noise_dir(ip), fp);
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float d01 = dot(gradient_noise_dir(ip + vec2(0, 1)), fp - vec2(0, 1));
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float d10 = dot(gradient_noise_dir(ip + vec2(1, 0)), fp - vec2(1, 0));
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float d11 = dot(gradient_noise_dir(ip + vec2(1, 1)), fp - vec2(1, 1));
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fp = fp * fp * fp * (fp * (fp * 6.0 - 15.0) + 10.0);
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return mix(mix(d00, d01, fp.y), mix(d10, d11, fp.y), fp.x) + 0.5;
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} |