//
//  TV3DManager.h
//  interface/src/devices
//
//  Created by Brad Hefta-Gaub on 12/24/2013.
//  Copyright 2013 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

#ifndef hifi_TV3DManager_h
#define hifi_TV3DManager_h

#include <iostream>

#include <glm/glm.hpp>

class Camera;
class RenderArgs;

struct eyeFrustum {
    double left;
    double right;
    double bottom;
    double top;
    float modelTranslation;
};


/// Handles interaction with 3D TVs
class TV3DManager {
public:
    static void connect();
    static bool isConnected();
    static void configureCamera(Camera& camera, int screenWidth, int screenHeight);
    static void display(RenderArgs* renderArgs, Camera& whichCamera);
    static void overrideOffAxisFrustum(float& left, float& right, float& bottom, float& top, float& nearVal,
        float& farVal, glm::vec4& nearClipPlane, glm::vec4& farClipPlane);
private:    
    static void setFrustum(Camera& whichCamera);
    static int _screenWidth;
    static int _screenHeight;
    static double _aspect;
    static eyeFrustum _leftEye;
    static eyeFrustum _rightEye;
    static eyeFrustum* _activeEye;
    
    // The first function is the code executed for each eye
    // while the second is code to be executed between the two eyes.
    // The use case here is to modify the output viewport coordinates 
    // for the new eye.
    // FIXME: we'd like to have a default empty lambda for the second parameter, 
    // but gcc 4.8.1 complains about it due to a bug.  See 
    // http://stackoverflow.com/questions/25490662/lambda-as-default-parameter-to-a-member-function-template
    template<typename F, typename FF>
    static void forEachEye(F f, FF ff) {
        f(_leftEye);
        ff();
        f(_rightEye);
    }
};

#endif // hifi_TV3DManager_h