{$INCLUDE 'color.shdr'}

{$CLASS PhongLight}
    {$PROPERTY UsePhongLight 'false'}
    {$IF UsePhongLight}
        {$VARYING 'vec3' 'vNormal'}
        {$VARYING 'vec3' 'vVertex'}
    {$END}
{$END}

{$CLASS PhongLightFrag $EXTENDS PhongLight ColorFrag}
    {$MAIN}
        vec4 color = {$CALL GetColor};
        {$IF UsePhongLight}
            vec3 eye       = normalize(-vVertex);
            vec3 lightVec  = gl_LightSource[0].position.xyz - vVertex;
            vec3 reflected = normalize(reflect(lightVec, vNormal)); 
            
            vec4 ambient  = gl_LightSource[0].ambient * gl_FrontMaterial.ambient;
            vec4 diffuse  = gl_LightSource[0].diffuse * max(dot(vNormal, lightVec), 0.0) * gl_FrontMaterial.diffuse;
            vec4 specular = gl_LightSource[0].specular * pow(max(dot(reflected, eye), 0.0), gl_FrontMaterial.shininess) * gl_FrontMaterial.specular;
            
            gl_FragColor = vec4((ambient + diffuse) * color) + specular;
        {$ELSE}
            gl_FragColor = color;
        {$END}
    {$END}
{$END}

{$CLASS PhongLightVert $EXTENDS PhongLight ColorVert}
    {$MAIN}
        {$INHERITED ColorVert $INLINE};
        {$IF UsePhongLight}
            vNormal = normalize(gl_NormalMatrix * gl_Normal);
            vVertex = vec3(gl_ModelViewMatrix * gl_Vertex);
        {$END}
    {$END}
{$END}