Libgdx OpenGL Shader for Water Reflection and blur

uniform sampler2D u_texture;  // Input texture
uniform float u_time;         // Time since the start of the program
uniform vec2 u_texelSize;     // Texel size of the input texture

varying vec2 v_texCoord0;

const float blurSize = 5.0;   // Size of the blur kernel

void main() {
    vec2 uv = v_texCoord0;

    // First pass: horizontal blur
    vec4 sum = vec4(0.0);
    for (float i = -blurSize; i <= blurSize; i++) {
        float offset = i * u_texelSize.x;
        vec4 color = texture2D(u_texture, uv + vec2(offset, 0.0));
        sum += color;
    }
    vec4 horizontalBlur = sum / (2.0 * blurSize + 1.0);

    // Second pass: vertical blur
    sum = vec4(0.0);
    for (float i = -blurSize; i <= blurSize; i++) {
        float offset = i * u_texelSize.y;
        vec4 color = texture2D(u_texture, uv + vec2(0.0, offset));
        sum += color;
    }
    vec4 verticalBlur = sum / (2.0 * blurSize + 1.0);

    vec4 color = texture2D(u_texture, uv);  // Get input color
    vec4 tintColor = vec4(1, 1, 1, 0.9);
    vec4 tintedColor = color * tintColor;

    vec2 center = vec2(0.5, 0.5);
    float distance = length(uv - center);
    float amplitude = 0.01;
    float frequency = 3.0;
    float phase = u_time * frequency;
    vec2 offset = vec2(cos(phase), sin(phase)) * amplitude * (1.0 - distance);

    vec4 finalColor = texture2D(u_texture, uv + offset) * tintColor;  // Get color at the offset texture coordinate
    gl_FragColor = mix(finalColor, verticalBlur, 0.5);  // Output the final color, using a 50/50 mix of the offset color and the vertical blur
}