Camera.h

/*

Copyright (c) 2018, Johnathan Corkery. (jcorkery@umich.edu)
All rights reserved.

This file is part of the Dynacoe project (https://github.com/jcorks/Dynacoe)
Dynacoe was released under the MIT License, as detailed below.



Permission is hereby granted, free of charge, to any person obtaining a copy 
of this software and associated documentation files (the "Software"), to deal 
in the Software without restriction, including without limitation the rights 
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
copies of the Software, and to permit persons to whom the Software is furnished 
to do so, subject to the following conditions:

The above copyright notice and this permission notice shall
be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.



*/

#ifndef DC_H_CAMERA_INCLUDED
#define DC_H_CAMERA_INCLUDED

#include <Dynacoe/Util/Vector.h>
#include <Dynacoe/Backends/Renderer/Renderer.h>
#include <Dynacoe/Util/TransformMatrix.h>
#include <Dynacoe/Entity.h>
// The Camera transformations apply to the 3D context.




namespace Dynacoe {

class Camera : public Entity {
  public:
    Camera();

    enum class Type {
        Perspective3D, 
        Orthographic2D 
    };

    void BindTransformBuffers(RenderBufferID mview, RenderBufferID proj);


    void SetType(Type);

    void Refresh();

    bool autoRefresh;



    void SetTarget(const Dynacoe::Vector & pos);



    Dynacoe::Vector TransformScreenToWorld(const Dynacoe::Vector & point, float distance);

    Dynacoe::Vector TransformWorldToScreen(const Dynacoe::Vector & point);


    void SetRenderResolution(int w, int h);


    int Width();

    int Height();



    TransformMatrix GetViewTransform();

    TransformMatrix GetProjectionTransform();

    Framebuffer * GetFramebuffer();

    AssetID CopyDisplay();


    void OnStep();
  private:
    static Camera * activeRef;

    void UpdateView();
    void UpdateProjection();
    void Activate(Renderer *);
    void Deactivate();

    int lastW, lastH;

    Type type;
    TransformMatrix projectionMatrix;
    Framebuffer * fb;


    RenderBufferID modelView;
    RenderBufferID projection;
    void Initialize();
    void OnUpdateTransform();
};
}

#endif