camera3_interface.h

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/*
**  camera3_interface.h
**
**  This is part of Shiokaze, a research-oriented fluid solver for computer graphics.
**  Created by Ryoichi Ando <rand@nii.ac.jp> on July 16, 2019.
**
**  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 SHKZ_CAMERA3_INTERFACE_H
#define SHKZ_CAMERA3_INTERFACE_H
//
#include <shiokaze/core/recursive_configurable_module.h>
#include <shiokaze/graphics/graphics_engine.h>
#include <shiokaze/math/vec.h>
#include <cmath>
#include "UI_interface.h"
//
SHKZ_BEGIN_NAMESPACE
//
class camera3_interface : public recursive_configurable_module, public UI_interface {
public:
    //
    DEFINE_MODULE(camera3_interface,"Camera 3D","Camera","3D Camera module")
    virtual void set_bounding_box( const double *p0, const double *p1 ) = 0;
    virtual void look_at( const double *target, const double *position, const double *up, double fov ) = 0;
    virtual void get( double *target, double *position, double *up, double *fov ) const = 0;
    void look_at( const double *target ) {
        //
        double target_old[3], position[3], up[3], fov;
        get(target_old,position,up,&fov);
        look_at(target,position,up,fov);
    }
    void look_from( const double *target, const double *direction, double distance, const double *up, double fov, double near, double far ) {
        //
        double len = sqrt(direction[0]*direction[0]+direction[1]*direction[1]+direction[2]*direction[2]);
        double position[3] = { target[0]+distance*direction[0]/len, target[1]+distance*direction[1]/len, target[2]+distance*direction[2]/len };
        look_at(target,position,up,fov);
    }
    void set_distance( double distance ) {
        //
        double target[3], position[3], up[3], fov;
        get(target,position,up,&fov);
        double direction[3] = { position[0]-target[0], position[1]-target[1], position[2]-target[2] };
        double len = sqrt(direction[0]*direction[0]+direction[1]*direction[1]+direction[2]*direction[2]);
        position[0] = target[0]+distance*direction[0]/len;
        position[1] = target[1]+distance*direction[1]/len;
        position[2] = target[2]+distance*direction[2]/len;
        look_at(target,position,up,fov);
    }
    double get_distance() const {
        double target[3], position[3], up[3], fov;
        get(target,position,up,&fov);
        double direction[3] = { position[0]-target[0], position[1]-target[1], position[2]-target[2] };
        return sqrt(direction[0]*direction[0]+direction[1]*direction[1]+direction[2]*direction[2]);
    }
    void set_fov( double fov ) {
        //
        double target[3], position[3], up[3], fov_old;
        get(target,position,up,&fov_old);
        look_at(target,position,up,fov);
    }
    virtual UI_interface::event_structure convert( const UI_interface::event_structure &event ) const = 0;
};
//
using camera3_ptr = std::unique_ptr<camera3_interface>;
using camera3_driver = recursive_configurable_driver<camera3_interface>;
//
SHKZ_END_NAMESPACE
//
#endif
//