mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-09 19:10:24 +00:00
45 lines
1.3 KiB
GLSL
45 lines
1.3 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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vec2 random2(vec2 st){
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st = vec2( dot(st,vec2(127.1,311.7)),
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dot(st,vec2(269.5,183.3)) );
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return -1.0 + 2.0*fract(sin(st)*43758.5453123);
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}
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// Value Noise by Inigo Quilez - iq/2013
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// https://www.shadertoy.com/view/lsf3WH
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float noise(vec2 st) {
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vec2 i = floor(st);
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vec2 f = fract(st);
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vec2 u = f*f*(3.0-2.0*f);
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return mix( mix( dot( random2(i + vec2(0.0,0.0) ), f - vec2(0.0,0.0) ),
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dot( random2(i + vec2(1.0,0.0) ), f - vec2(1.0,0.0) ), u.x),
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mix( dot( random2(i + vec2(0.0,1.0) ), f - vec2(0.0,1.0) ),
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dot( random2(i + vec2(1.0,1.0) ), f - vec2(1.0,1.0) ), u.x), u.y);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution.xy;
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st.x *= u_resolution.x/u_resolution.y;
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vec3 color = vec3(0.0);
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float t = 1.0;
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// Uncomment to animate
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// t = abs(1.0-sin(u_time*.1))*5.;
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// Comment and uncomment the following lines:
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st += noise(st*2.)*t; // Animate the coordinate space
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color = vec3(1.) * smoothstep(.18,.2,noise(st)); // Big black drops
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color += smoothstep(.15,.2,noise(st*10.)); // Black splatter
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color -= smoothstep(.35,.4,noise(st*10.)); // Holes on splatter
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gl_FragColor = vec4(1.-color,1.0);
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}
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