precision mediump float;
varying vec2 v_texcoord;
uniform float u_time;
uniform float uAmplitude;
uniform float uScrollSpeed;

uniform sampler2D uDiffuse;

float inverseLerp(float v, float minVal, float maxVal) {
    return (v - minVal) / (maxVal - minVal);
}

float remap(float v, float inMin, float inMax, float outMin, float outMax) {
    float t = inverseLerp(v, inMin, inMax);