eye_dome_lighting.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_EYE_DOME_LIGHTING_H
#define EASY3D_RENDERER_EYE_DOME_LIGHTING_H
 
 
namespace easy3d {
 
    class Camera;
    class ShaderProgram;
    class FramebufferObject;

    class EyeDomeLighting
    {
    public:
        explicit EyeDomeLighting(Camera* cam);
        virtual ~EyeDomeLighting();
        void begin();
        void end();
 
    protected:
 
        // Initialization of required framebuffer objects
        void init_frame_buffers(int w, int h);
 
        // Initialization of required GLSL shaders
        void init_shader_programs();
 
        // Render EDL in full resolution buffer
        void shade_high(float scene_radius);
 
        // Render EDL in middle resolution buffer
        void shade_low();
 
        // Render EDL in middle resolution buffer
        void blur_low();
 
        // Compose color and shaded images
        void compose();
 
        // Release graphics resources
        void clear();
 
    private:
        Camera* camera_;
 
        // Framebuffer object for initial projection
 
        // used to record scene data
        FramebufferObject* projection_fbo_;

 
        // Framebuffer objects for EDL
 
        // for EDL full res shading
        FramebufferObject* high_fbo_;
 
        // for EDL low res shading (image size/4)
        FramebufferObject* low_fbo_;

 
        // Shader programs
        ShaderProgram* shade_program_;
        ShaderProgram* compose_program_;
        ShaderProgram* blur_program_;
 
        float neighbours_[8][4];
        float low_res_factor_; // basically 4

 
        float z_near_;  // near clipping plane
        float z_far_;   // far clipping plane
 
        int width_;
        int height_;
 
    private:
        //copying disabled
        EyeDomeLighting(const EyeDomeLighting&);
        EyeDomeLighting& operator=(const EyeDomeLighting&);
    };
 
}
 
#endif  // EASY3D_RENDERER_EYE_DOME_LIGHTING_H