#ifndef _ENVIRONMENT_SAMPLE_GLSL_
#define _ENVIRONMENT_SAMPLE_GLSL_

// Sample diffuse ambient environment lighting (irradiance)
vec3 sampleDiffuseEnvironment(vec3 normal) {
#ifdef _Irr
    vec3 envl = shIrradiance(normal, shirr);

    #ifdef _EnvTex
    envl /= PI;
    #endif

    return envl;
#else
    return vec3(0.0);
#endif
}

// Sample specular environment reflection (skybox or cubemap)
vec3 sampleSpecularEnvironment(vec3 viewDir, float roughness) {
#ifdef _EnvTex
    return textureLod(texEnvironment, viewDir, roughness * 8.0).rgb;
#else
    return vec3(0.0);
#endif
}

#endif