64 lines
1.3 KiB
GLSL
64 lines
1.3 KiB
GLSL
// Lightning
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// By: Brandon Fogerty
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// bfogerty at gmail dot com
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// xdpixel.com
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#ifdef GL_ES
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precision mediump float;
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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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float Hash( vec2 p)
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{
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vec3 p2 = vec3(p.xy,2.0);
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return fract(sin(dot(p2,vec3(27.1,20.7, 2.4)))*0.5453123);
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}
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float noise(in vec2 p)
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{
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vec2 i = floor(p);
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vec2 f = fract(p);
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f *= f * (3.0-2.0*f);
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return mix(mix(Hash(i + vec2(0.,0.)), Hash(i + vec2(1.,0.)),f.x),
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mix(Hash(i + vec2(0.,1.)), Hash(i + vec2(1.,1.)),f.x),
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f.y);
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}
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float fbm(vec2 p)
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{
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float v = 0.0;
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v += noise(p*1.0) * .5;
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v += noise(p*2.) * .25;
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v += noise(p*4.) * .15;
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return v;
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}
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void main( void )
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{
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vec2 uv = ( gl_FragCoord.xy / resolution.xy ) * 2.0 - 1.0;
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vec2 center = vec2(0.0, 0.0);
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float angle = time * 0.4;
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//uv.x = cos(angle) * (uv.x - center.x) - sin(angle) * (uv.y - center.y) + center.x;
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//uv.y = sin(angle) * (uv.x - center.y) + cos(angle) * (uv.y - center.y) + center.y;
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vec3 finalColor = vec3( 0.0 );
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for( int i=0; i < 3; ++i )
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{
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float t = abs( 1.4 / (sin(uv.y + fbm( uv + time * 0.04 )) * 100.0) );
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finalColor += t * vec3( 2.9, 1.5, .25 );
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finalColor = vec3(t);
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}
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gl_FragColor = vec4( finalColor, 1.0 );
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}
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