#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);
}

float pingPong(float x, float length) {
    float modVal = mod(x, length * 2.0);
    return modVal <= length ? modVal : length * 2.0 - modVal;
}

vec4 blur(sampler2D image, vec2 uv, vec2 resolution) {
    vec2 texelSize = 1.0 / resolution;
    vec4 result = vec4(0.0);
    float kernel[100];
    float kernelVals[100] = float[](0.5, 1.0, 1.5, 2.0, 2.5, 2.5, 2.0, 1.5, 1.0, 0.5,
                                    1.0, 2.0, 2.5, 3.0, 3.5, 3.5, 3.0, 2.5, 2.0, 1.0,
                                    1.5, 2.5, 3.0, 3.5, 4.0, 4.0, 3.5, 3.0, 2.5, 1.5,
                                    2.0, 3.0, 3.5, 4.0, 4.5, 4.5, 4.0, 3.5, 3.0, 2.0,
                                    2.5, 3.5, 4.0, 4.5, 5.0, 5.0, 4.5, 4.0, 3.5, 2.5,
                                    2.5, 3.5, 4.0, 4.5, 5.0, 5.0, 4.5, 4.0, 3.5, 2.5,
                                    2.0, 3.0, 3.5, 4.0, 4.5, 4.5, 4.0, 3.5, 3.0, 2.0,
                                    1.5, 2.5, 3.0, 3.5, 4.0, 4.0, 3.5, 3.0, 2.5, 1.5,
                                    1.0, 2.0, 2.5, 3.0, 3.5, 3.5, 3.0, 2.5, 2.0, 1.0,
                                    0.5, 1.0, 1.5, 2.0, 2.5, 2.5, 2.0, 1.5, 1.0, 0.5);

    for (int i = 0; i < 100; i++) {
        kernel[i] = kernelVals[i];
    }

    float kernelSum = 0.0;
    for (int i = 0; i < 100; i++) {
        kernelSum += kernel[i];
    }

    for (int x = -5; x <= 4; ++x) {
        for (int y = -5; y <= 4; ++y) {
            vec2 offset = vec2(float(x), float(y)) * texelSize;
            result += texture(image, uv + offset) * kernel[(y + 5) * 10 + (x + 5)];
        }
    }

    return result / kernelSum;
}

vec4 FragColorRotate(vec4 FragColor) {
    ivec4 col = ivec4(FragColor * 255);
    for (int i = 0; i < 3; ++i) {
        col[i] = col[i] % 0xFF;
    }
    return vec4(col / 255.0);
}

void main(void) {
    vec2 uv = TexCoord * 2.0 - 1.0;
    uv.y *= iResolution.y / iResolution.x;
    float time_t = pingPong(time_f, 15.0) + 1.0;
    float wave = sin(uv.x * 10.0 + time_t * 2.0) * 0.1;
    vec2 random_direction = smoothRandom2(time_t) * 0.5;
    float expand = 0.5 + 0.5 * sin(time_t * 2.0);
    vec2 spiral_uv = uv * expand + random_direction;

    vec3 rainbow_FragColor = rainbow(uv.x + sin(time_f * 0.5 + uv.y * 5.0) * 0.1);

    vec4 blurred_FragColor = blur(textTexture, TexCoord, iResolution);
    vec3 blended_FragColor = mix(blurred_FragColor.rgb, rainbow_FragColor, 0.5);
    FragColor = vec4(sin(blended_FragColor * time_t), blurred_FragColor.a);
}