average_color_blending.h

/********************************************************************
 * Copyright (C) 2015 Liangliang Nan <liangliang.nan@gmail.com>
 * https://3d.bk.tudelft.nl/liangliang/
 *
 * This file is part of Easy3D. If it is useful in your research/work,
 * I would be grateful if you show your appreciation by citing it:
 * ------------------------------------------------------------------
 *      Liangliang Nan.
 *      Easy3D: a lightweight, easy-to-use, and efficient C++ library
 *      for processing and rendering 3D data.
 *      Journal of Open Source Software, 6(64), 3255, 2021.
 * ------------------------------------------------------------------
 *
 * Easy3D is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 3
 * as published by the Free Software Foundation.
 *
 * Easy3D is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ********************************************************************/
 
#ifndef EASY3D_RENDERER_AVERAGE_COLOR_BLENDING_H
#define EASY3D_RENDERER_AVERAGE_COLOR_BLENDING_H
 
#include <vector>
#include <easy3d/renderer/transparency.h>
 
 
namespace easy3d {
 
    class Camera;
    class TrianglesDrawable;
    class FramebufferObject;
 
    class AverageColorBlending : public Transparency
    {
    public:
        explicit AverageColorBlending(Camera* cam);
        ~AverageColorBlending() override;
 
        void draw(const std::vector<TrianglesDrawable*>& surfaces) override;
 
    protected:
 
        // Allocate and configure FBOs, shader programs.
        void init(int w, int h);
 
        // Render the opaque pass geometry.
        void geometry_pass(const std::vector<TrianglesDrawable*>& surfaces);
 
        // Release all FBOs, shader programs.
        void clear();
 
    private:
        Camera* camera_;
        float   bkg_color_[4];
 
        FramebufferObject* fbo_;
 
    private:
        //copying disabled
        AverageColorBlending(const AverageColorBlending&);
        AverageColorBlending& operator=(const AverageColorBlending&);
    };
 
}
 
#endif // EASY3D_RENDERER_AVERAGE_COLOR_BLENDING_H