59 lines
1.9 KiB
GLSL
59 lines
1.9 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#extension GL_OES_standard_derivatives : enable
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#endif
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uniform float time;
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uniform vec2 mouse;
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uniform vec2 resolution;
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#define t time
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#define r resolution
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// Created by inigo quilez - iq/2015
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// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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// A simple way to create color variation in a cheap way (yes, trigonometrics ARE cheap
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// in the GPU, don't try to be smart and use a triangle wave instead).
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// See http://iquilezles.org/www/articles/palettes/palettes.htm for more information
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vec3 pal( in float t, in vec3 a, in vec3 b, in vec3 c, in vec3 d )
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{
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return a + b*cos( 6.28318*(c*t+d) );
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}
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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vec2 p = fragCoord.xy / r.xy;
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// animate
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p.x += 0.3*t;
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// compute colors
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vec3 col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.0,0.33,0.67) );
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if( p.y>(1.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.0,0.10,0.20) );
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if( p.y>(2.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,1.0),vec3(0.3,0.20,0.20) );
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if( p.y>(3.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,1.0,0.5),vec3(0.8,0.90,0.30) );
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if( p.y>(4.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(1.0,0.7,0.4),vec3(0.0,0.15,0.20) );
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if( p.y>(5.0/7.0) ) col = pal( p.x, vec3(0.5,0.5,0.5),vec3(0.5,0.5,0.5),vec3(2.0,1.0,0.0),vec3(0.5,0.20,0.25) );
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if( p.y>(6.0/7.0) ) col = pal( p.x, vec3(0.8,0.5,0.4),vec3(0.2,0.4,0.2),vec3(2.0,1.0,1.0),vec3(0.0,0.25,0.25) );
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// band
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float f = fract(p.y*7.0);
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// borders
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col *= smoothstep( 0.49, 0.47, abs(f-0.5) );
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// shadowing
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col *= 0.5 + 0.5*sqrt(4.0*f*(1.0-f));
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// dithering
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//col += (1.0/255.0)*texture2D( iChannel0, fragCoord.xy/iChannelResolution[0].xy ).xyz;
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fragColor = vec4( col, 1.0 );
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}
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void main()
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{
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mainImage(gl_FragColor, gl_FragCoord.xy);
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}
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