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varying vec3 position, normal;

varying vec4 specular, ambient, diffuse, lightDirection;

uniform sampler2D tex;

uniform samplerCube env;

uniform mat4 view;

uniform vec4 basicColor;

void main()

{

    vec3 N = normalize(normal);

    // assume directional light

    gl_MaterialParameters M = gl_FrontMaterial;

    float NdotL = dot(N, lightDirection.xyz);

    float RdotL = dot(reflect(normalize(position), N), lightDirection.xyz);

    vec3 absN = abs(gl_TexCoord[1].xyz);

    vec3 texCoord;

    if (absN.x > absN.y && absN.x > absN.z)

        texCoord = gl_TexCoord[1].yzx;

    else if (absN.y > absN.z)

        texCoord = gl_TexCoord[1].zxy;

    else

        texCoord = gl_TexCoord[1].xyz;

    texCoord.y *= -sign(texCoord.z);

    texCoord += 0.5;

    vec4 texColor = texture2D(tex, texCoord.xy);

    vec4 unlitColor = gl_Color * mix(basicColor, vec4(texColor.xyz, 1.0), texColor.w);

    vec4 litColor = (ambient + diffuse * max(NdotL, 0.0)) * unlitColor +

                     M.specular * specular * pow(max(RdotL, 0.0), M.shininess);

    vec3 R = 2.0 * dot(-position, N) * N + position;

    vec4 reflectedColor = textureCube(env, R * mat3(view[0].xyz, view[1].xyz, view[2].xyz));

    gl_FragColor = mix(litColor, reflectedColor, 0.2 + 0.8 * pow(1.0 + dot(N, normalize(position)), 2.0));

}