mirror of
https://github.com/zbanks/radiance.git
synced 2026-06-16 04:26:25 +02:00
Eric Van Albert
66 lines
1.5 KiB
GLSL
66 lines
1.5 KiB
GLSL
#property description Lightspeed travel rays
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#property author https://www.shadertoy.com/view/Xdl3D2
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#property frequency 1
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const float tau = 6.28318530717958647692;
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// Gamma correction
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#define GAMMA (2.2)
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vec3 ToLinear( in vec3 col )
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{
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// simulate a monitor, converting colour values into light values
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return pow( col, vec3(GAMMA) );
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}
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vec3 ToGamma( in vec3 col )
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{
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// convert back into colour values, so the correct light will come out of the monitor
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return pow( col, vec3(1.0/GAMMA) );
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}
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vec4 Noise( in ivec2 x )
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{
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return 2. * texture(iNoise, (vec2(x)+0.5)/256.0, -100.);
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}
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void main()
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{
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vec3 ray;
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ray.xy = 2.0*(gl_FragCoord.xy-iResolution.xy*.5)/iResolution.x;
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ray.z = 1.0;
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//float offset = iTime*.5;
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//float speed2 = (cos(offset)+1.0)*2.0;
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float offset = iTime * iFrequency * 0.25;
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float speed2 = 3. * iAudioLow;
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float speed = speed2+.1;
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//offset += sin(offset)*.96;
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//offset *= 2.0;
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vec3 col = vec3(0);
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vec3 stp = ray/max(abs(ray.x),abs(ray.y));
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vec3 pos = 2.0*stp+.5;
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for ( int i=0; i < 20; i++ )
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{
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float z = Noise(ivec2(pos.xy)).x;
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z = fract(z-offset);
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float d = 50.0*z-pos.z;
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float w = pow(max(0.0,1.0-8.0*length(fract(pos.xy)-.5)),2.0);
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vec3 c = max(vec3(0),vec3(1.0-abs(d+speed2*.5)/speed,1.0-abs(d)/speed,1.0-abs(d-speed2*.5)/speed));
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col += 1.5*(1.0-z)*c*w;
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pos += stp;
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}
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vec4 fc;
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fc.rgb = ToGamma(col);
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fc.a = max(max(fc.r, fc.g), fc.b);
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fc *= smoothstep(0., 0.2, iIntensity);
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vec4 c = texture(iInput, uv);
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fragColor = max(c, fc);
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}
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