#version 460 core

layout(rgba32f, binding = 0) uniform writeonly image2D outputImage;

layout(local_size_x = 16, local_size_y = 16) in;
void main()
{
    ivec2 pixelCoord = ivec2(gl_GlobalInvocationID.xy);

    if (pixelCoord.x >= imageSize(outputImage).x || pixelCoord.y >= imageSize(outputImage).y)
		return;

    ivec2 texSize = imageSize(outputImage);
    vec2 fTexSize = vec2(texSize);
    vec2 normalizedCoord = vec2(pixelCoord) / vec2(texSize);

    vec4 O = vec4(0, 0, 0, 1);
    vec2 I = vec2(pixelCoord);

    float iTime = 2.2;
    float i = 0.0, t=iTime;
    O *= i;
    for(vec2 a=fTexSize.xy, p=(I+I-a)/a.y; i++<20.;
        O += (cos(sin(i*.2+t)*vec4(0,4,3,1))+2.)
        /(i/1e3+abs(length(a-.5*min(a+a.yx,.1))-.05)))
        a.x = abs(a = (fract(.2*t+.3*p*i*mat2(cos(cos(.2*t+.2*i)+vec4(0,11,33,0))))-.5)).x;
        
    O = tanh(O*O/2e5);

    vec4 color = vec4(normalizedCoord, 0.0, 1.0);
    imageStore(outputImage, pixelCoord, O);
}