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52 lines
1.3 KiB
52 lines
1.3 KiB
#iChannel0::WrapMode "Repeat"
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#iChannel0 "file://./sand2.jpg"
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float N21(vec2 p) {
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//return fract( sin(p.x*100.0+p.y*6574.0)*5647.0 );
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p = fract(p*vec2(233.32, 851.73));
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p += dot(p, p+23.45);
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return fract(p.x*p.y);
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}
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float SmoothNoise(vec2 uv) {
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vec2 lv = fract(uv);
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vec2 id = floor(uv);
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lv = smoothstep(0.0,1.0, lv); // = lv*lv*(3.-2.*lv);
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float bl = N21(id);
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float br = N21(id+vec2(1.0, 0.0));
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float b = mix(bl, br, lv.x);
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float tl = N21(id+vec2(0.0,1.0));
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float tr = N21(id+vec2(1.0,1.0));
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float t = mix(tl, tr, lv.x);
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return mix(b,t, lv.y);
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}
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float SmoothNoise2(vec2 uv, int ocataves) {
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float c = 0.0;
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float norm = 0.0;
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float limit = pow(2.0, float(ocataves));
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for(float i=1.0; i<=limit; i*=2.0){
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float norm_fract = 1.0/i;
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c += SmoothNoise(uv*i)*norm_fract;
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norm+= norm_fract;
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}
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return c/norm;
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}
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void mainImage ( out vec4 fragColor, in vec2 fragCoord) {
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vec2 uv = (fragCoord-0.5*iResolution.xy)/iResolution.y;
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uv = uv*4.;
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float tmp;
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float b = SmoothNoise2(uv+iTime*0.5,2)*0.5+SmoothNoise2(uv-iTime*0.2,2)*0.5;
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tmp = smoothstep(0.5, 0.505, b);
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b = tmp - smoothstep(0.505, 0.51, b);
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fragColor = vec4( texture(iChannel0, uv+ SmoothNoise2(uv+iTime*0.5,2)*0.4 ).xyz+b, 1.0 );
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} |