URL: http://glslsandbox.com/e#22852.0
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// Endless Tunnel // By: Brandon Fogerty // bfogerty at gmail dot com // xdpixel.com #ifdef GL_ES precision mediump float; #endif uniform vec2 resolution; uniform float time; #define HorizontalAmplitude 0.80 #define VerticleAmplitude 0.80 #define HorizontalSpeed 0.90 #define VerticleSpeed 0.50 #define ParticleMinSize 1.76 #define ParticleMaxSize 1.71 #define ParticleBreathingSpeed 0.30 #define ParticleColorChangeSpeed 0.70 #define ParticleCount 7.0 #define ParticleColor1 vec3(9.0, 5.0, 3.0) #define ParticleColor2 vec3(1.0, 3.0, 9.0) vec3 checkerBoard( vec2 uv, vec2 pp ) { vec2 p = floor( uv * 4.6 ); float t = mod( p.x + p.y, 2.2); vec3 c = vec3(t+pp.x, t+pp.y, t+(pp.x*pp.y)); return c; } vec3 tunnel( vec2 p, float scrollSpeed, float rotateSpeed ) { float a = 2.0 * atan( p.x, p.y ); float po = 2.0; float px = pow( p.x*p.x, po ); float py = pow( p.y*p.y, po ); float r = pow( px + py, 1.0/(2.0*po) ); vec2 uvp = vec2( 1.0/r + (time*scrollSpeed), a + (time*rotateSpeed)); vec3 finalColor = checkerBoard( uvp, p ).xyz; finalColor *= r; return finalColor; } vec3 particles( vec2 uv ) { vec2 pos = uv * 2.0 - 1.0; pos.x *= (resolution.x / resolution.y); vec3 c = vec3( 0, 0, 0 ); for( float i = 1.0; i < ParticleCount+1.0; ++i ) { float cs = cos( time * HorizontalSpeed * (i/ParticleCount) ) * HorizontalAmplitude; float ss = sin( time * VerticleSpeed * (i/ParticleCount) ) * VerticleAmplitude; vec2 origin = vec2( cs , ss ); float t = sin( time * ParticleBreathingSpeed * i ) * 0.5 + 0.5; float particleSize = mix( ParticleMinSize, ParticleMaxSize, t ); float d = clamp( sin( length( pos - origin ) + particleSize ), 0.0, particleSize); float t2 = sin( time * ParticleColorChangeSpeed * i ) * 0.5 + 0.5; vec3 color = mix( ParticleColor1, ParticleColor2, t2 ); c += color * pow( d, 70.0 ); } return c; } void main(void) { vec2 uv = gl_FragCoord.xy / resolution.xy; float timeSpeedX = time * 0.3; float timeSpeedY = time * 0.2; vec2 p = uv + vec2( -0.50+cos(timeSpeedX)*0.2, -0.5-sin(timeSpeedY)*0.3 ); vec3 finalColor = tunnel( p , 1.0, 0.0); timeSpeedX = time * 0.30001; timeSpeedY = time * 0.20001; p = uv + vec2( -0.50+cos(timeSpeedX)*0.2, -0.5-sin(timeSpeedY)*0.3 ); finalColor += particles( uv ); gl_FragColor = vec4( finalColor, 1.0 ); } |