//
// Vertex shader for image-based lighting with ambient occlusion
//
// Author: Randi Rost
//
// Copyright (c) 2003-2006: 3Dlabs, Inc.
//
// See 3Dlabs-License.txt for license information
//

uniform vec3  BaseColor;
uniform float SpecularPercent;
uniform float DiffusePercent;

uniform samplerCube SpecularEnvMap;
uniform samplerCube DiffuseEnvMap;

varying vec3  ReflectDir;
varying vec3  Normal;
varying float Accessibility;

void main()
{
    // Look up environment map values in cube maps

    vec3 diffuseColor  = 
        vec3(textureCube(DiffuseEnvMap,  normalize(Normal)));

    vec3 specularColor = 
        vec3(textureCube(SpecularEnvMap, normalize(ReflectDir)));

    // Add lighting to base color and mix

    vec3 color = mix(BaseColor, diffuseColor*BaseColor, DiffusePercent);
    color     *= Accessibility;
    color      = mix(color, specularColor + color, SpecularPercent);

    gl_FragColor = vec4(envColor, 1.0);
}