#import "Common/ShaderLib/GLSLCompat.glsllib"

uniform vec4      m_Diffuse;
uniform sampler2D m_BarkMap;
uniform bool      m_HasBarkMap;
uniform vec3      m_LightDir;
uniform vec3      m_SunColor;
uniform vec3      m_AmbientColor;
uniform float     m_Wetness;

in vec2 texCoord;
in vec3 worldNormal;

void main() {
    vec3 n = normalize(worldNormal);

    vec3 baseColor = m_HasBarkMap
        ? texture2D(m_BarkMap, texCoord).rgb * m_Diffuse.rgb
        : m_Diffuse.rgb;

    float diff  = max(dot(n, normalize(m_LightDir)), 0.0);
    vec3  light = clamp(m_AmbientColor + m_SunColor * diff, 0.0, 1.0);

    baseColor *= (1.0 - 0.18 * m_Wetness);
    float shine = pow(diff, 12.0) * m_Wetness * 0.30;
    gl_FragColor = vec4(baseColor * light + vec3(shine), m_Diffuse.a);
}