#version 300 es
precision highp float;


in vec2 TexCoord;
out vec4 FragColor;
uniform sampler2D textTexture;
uniform float time_f;
uniform vec2 iResolution;

float hash(float n) {
    return fract(sin(n) * 43758.5453123);
}

vec2 random2(vec2 st) {
    st = vec2(dot(st, vec2(127.1, 311.7)),
              dot(st, vec2(269.5, 183.3)));
    return -1.0 + 2.0 * fract(sin(st) * 43758.5453123);
}

vec2 smoothRandom2(float t) {
    float t0 = floor(t);
    float t1 = t0 + 1.0;
    vec2 rand0 = random2(vec2(t0));
    vec2 rand1 = random2(vec2(t1));
    float mix_factor = fract(t);
    return mix(rand0, rand1, smoothstep(0.0, 1.0, mix_factor));
}

vec3 rainbow(float t) {
    t = fract(t);
    float r = abs(t * 6.0 - 3.0) - 1.0;
    float g = 2.0 - abs(t * 6.0 - 2.0);
    float b = 2.0 - abs(t * 6.0 - 4.0);
    return clamp(vec3(r, g, b), 0.0, 1.0);
}

void main(void) {
    vec2 uv = TexCoord * 2.0 - 1.0;
    uv.y *= iResolution.y / iResolution.x;
    float wave = sin(uv.x * 10.0 + time_f * 2.0) * 0.1;
    vec2 random_direction = smoothRandom2(time_f) * 0.5;
    float expand = 0.5 + 0.5 * sin(time_f * 2.0);
    vec2 spiral_uv = uv * expand + random_direction;
    float angle = atan(spiral_uv.y + wave, spiral_uv.x) + time_f * 2.0;
    vec3 rainbow_FragColor = rainbow(angle / (2.0 * 3.14159));
    vec4 original_FragColor = texture(textTexture, TexCoord);
    vec3 blended_FragColor = mix(original_FragColor.rgb, rainbow_FragColor, 0.5);
    float time_t = mod(time_f, 30.0);

    vec2 normPos = (gl_FragCoord.xy / iResolution.xy) * 2.0 - 1.0;
    float dist = length(normPos);
    float phase = sin(dist * 10.0 - time_f * 4.0);
    vec2 TexCoordAdjusted = TexCoord + (normPos * 0.305 * phase);
    vec4 adjusted_FragColor = texture(textTexture, TexCoordAdjusted);

    vec3 final_FragColor = mix(blended_FragColor, adjusted_FragColor.rgb, 0.5);

    FragColor = vec4(sin(final_FragColor * time_t), original_FragColor.a);
}