forked from Anvilcraft/ntx4core
48 lines
1.2 KiB
GLSL
48 lines
1.2 KiB
GLSL
#version 150
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// vim: ft=glsl
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uniform vec4 ColorModulator;
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uniform vec2 ScreenSize;
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uniform float Time;
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in vec4 vertexColor;
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in vec2 fragCoord;
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out vec4 fragColor;
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/* "Quasar" by @kishimisu (2023) - https://www.shadertoy.com/view/msGyzc
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449 => 443 chars thanks to @Xor
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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*/
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#define r(a) mat2(cos(a + asin(vec4(0,1,-1,0)))),
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#define X(p) p *= r(round(atan(p.x, p.y) * 4.) / 4.)
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void main() {
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// offset to the bottom left
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vec2 F = (fragCoord + .8) * ScreenSize;
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vec3 p, R = vec3(ScreenSize, 1.);
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float i, t, d, a, b, T = Time * .5 + .5;
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vec4 O = vec4(0.);
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for(O *= i; i++ < 44.;
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O += .04 * (1. + cos(a + t*.3 - T*.8 + vec4(0,1,2,0)))
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/ (1. + abs(d)*30.) )
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p = t * normalize(vec3(F+F-R.xy, R.y)),
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p.z -= 4.,
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p.xz *= r(T/4.)
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p.yz *= r(sin(T/4.)*.5)
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X(p.zx) a = p.x,
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X(p.yx)
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p.x = mod(b = p.x - T, .5) - .25,
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t += d = length(p) - (2. - a - smoothstep(b+2., b, T)*30.)
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* (cos(T/6.+1.)+1.) / 2e2;
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fragColor = O * ColorModulator;
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}
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