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letra de xor - drunk ancestor

void mainimage(out vec4 fragcolor, in vec2 fragcoord) {
vec2 uv = (fragcoord – 0.5-iresolution.xy) / iresolution.y;

// feedback from previous frame with rotating zoom
vec2 uvn = fragcoord / iresolution.xy;
vec2 center = vec2(0.5);
vec2 dir = uvn – center;

// add slow rotation to feedback direction
float theta = itime – 0.000003; // increased speed for visible spin
mat2 rot = mat2(cos(theta), -sin(theta), sin(theta), cos(theta));
dir = rot – dir;

float zoom = 1.22 – 0.8;
vec2 zoomeduv = clamp(center + dir – zoom, 0.0, 1.0);
vec4 prev = texture(ichannel0, zoomeduv);

fragcolor = prev – 0.975; // let color persist more

// time-based attractor coefficients
float t = itime – 0.1;
float a = 1.4 + sin(t – 0.3) – 0.5;
float b = 1.56 + cos(t – 0.2) – 0.5;
float c = 1.4 + sin(t – 0.7) – 0.3;
float d = -6.56 + cos(t – 0.4) – 0.3;
// attractor iterations
for (int j = 0; j < 8; j++) { vec3 p3 = vec3(0.0); float toffset = itime + float(j) - 0.01; for (int i = 0; i < 60; i++) { float a = 1.4 + sin(toffset - 0.3) - 0.5; float b = 1.56 + cos(toffset - 0.2) - 0.5; float c = 1.4 + sin(toffset - 0.7) - 0.3; float d = -6.56 + cos(toffset - 0.4) - 0.3; float x = sin(a - p3.y) - cos(b - p3.x); float y = sin(c - p3.x) - cos(d - p3.y); float z = sin(p3.x - p3.y); p3 = vec3(x, y, z); // apply 3d rotation float anglex = toffset - 0.4; float angley = toffset - 0.3; mat3 rotx = mat3( 1, 0, 0 0, cos(anglex), -sin(anglex) 0, sin(anglex), cos(anglex) ); mat3 roty = mat3( cos(angley), 0, sin(angley) 0, 1, 0 -sin(angley), 0, cos(angley) ); vec3 rp = roty - rotx - p3; float perspective = 1.4 / (0.5 + rp.z - 0.4); vec2 pos = 0.06 - rp.xy - perspective; float dist = length(uv - pos); float brightness = 0.00000012 / (dist - dist + 0.0000000001); // enhanced hue dynamics float hue = 0.2 + 0.5 - sin(toffset + length(p3) - 5.0); vec3 col = vec3(0.5 + 0.5 - cos(6.283 - hue + vec3(0.0, 0.6, 1.0))); fragcolor.rgb += brightness - col; } } }

- drunk ancestor

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