texture_renderer.h

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/* This file is part of BlosSOM.
 *
 * Copyright (C) 2021 Sona Molnarova
 *
 * BlosSOM is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * BlosSOM 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
 * BlosSOM. If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef TEXTURE_RENDERER_H
#define TEXTURE_RENDERER_H
 
#include <array>
 
#include "shader.h"
#include "view.h"
 
/**
 * @brief Takes care of the rendering to the texture
 * and then rendering the texture to the screen.
 *
 */
struct TextureRenderer
{
    TextureRenderer();
 
    void init();
 
    void bind_default_fb();
    void render();
    void bind_fb(const glm::vec2 &fb_size);
 
    size_t get_active_fb() { return current_fb; }
    size_t get_num_of_texts() { return num_of_textures; }
 
private:
    static constexpr size_t num_of_textures = 5;
 
    const std::array<float, 12> screen_quad_data;
 
    Shader shader_tex;
    unsigned int VAO_quad;
    unsigned int VBO_quad;
 
    size_t current_fb;
    glm::vec2 fb_size;
 
    std::array<unsigned int, num_of_textures> fbs;
    std::array<unsigned int, num_of_textures> textures;
 
    void gen_fbs();
    void gen_textures();
 
    void bind_fbs_and_textures();
 
    void resize_fbs(const glm::vec2 &fb_size);
    void prepare_screen_quad_data();
};
 
#endif // #ifndef TEXTURE_RENDERER_H