#version 330 core

out vec4 FragColor;

uniform vec3 rainColor;
uniform float alpha;

// Simple noise function
float rand(vec2 co){
    return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

void main()
{
    // Simulate the light effect on the raindrop by modifying the color and alpha
    vec3 finalColor = rainColor;
    float gradient = gl_FragCoord.y / 600.0; // Assuming the screen height is 600
    float transparency = alpha * gradient;

    // Add a slight blue tint to the raindrop
    finalColor = mix(finalColor, vec3(0.0, 0.4, 1.0), 0.5 * gradient);

    // Add some noise to make the raindrop more realistic
    float noise = rand(gl_FragCoord.xy) * 0.2;
    transparency = transparency * (0.6 + noise); // Increase transparency variation

    // Adjust the final color and transparency
    FragColor = vec4(finalColor, transparency);
}