#version 330 core

in vec3 vNormal;
in vec3 vWorldPos;
in vec3 vUV;
out vec4 FragColor;

uniform vec3 uCameraPos;
uniform vec3 uLightDir;
uniform sampler2D uHeightTex;
uniform float uMinV;
uniform float uMaxV;
uniform vec2 uTexelSize;
uniform vec3 uColorZero;
uniform vec3 uColorLow;
uniform vec3 uColorMid;
uniform vec3 uColorHeigh;

float saturate(float x) {
    return clamp(x, 0.0, 1.0);
}

float value01(float v) {
    return saturate((v - uMinV) / max(uMaxV - uMinV, 1e-6));
}

vec3 colorRamp(float t) {
    if (t < 0.5) {
        return mix(uColorLow, uColorMid, t / 0.5);
    }

    return mix(uColorHeigh, uColorMid, (t - 0.5) / 0.5);
}

float maxNeighborValue(vec2 uv) {
    
}