scatter_renderer.h

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/* This file is part of BlosSOM.
 *
 * Copyright (C) 2021 Mirek Kratochvil
 *                    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 SCATTER_RENDERER_H
#define SCATTER_RENDERER_H
 
#include "color_data.h"
#include "scatter_model.h"
#include "texture_renderer.h"
#include "view.h"
 
#include "shader.h"
 
/**
 * @brief Renderer of the 2D data points.
 *
 */
struct ScatterRenderer
{
    ScatterRenderer();
 
    void init();
 
    /**
     * @brief Draw event of the 2D data points.
     *
     * Renders data points at given positions.
     *
     * @param v View of the whole window.
     * @param m Model that contains 2D coordinates.
     * @param colors Data that contains colors of the points.
     */
    void draw(const glm::vec2 &fb_size,
              const View &v,
              const ScatterModel &m,
              const ColorData &colors);
 
private:
    TextureRenderer texture_renderer;
 
    Shader shader;
    unsigned int VAO;
    unsigned int VBO_pos;
    unsigned int VBO_col;
 
    /**
     * @brief Prepare data to render scatterplot with colors.
     *
     * Fill VBOs and VAO.
     *
     * @param model Data source
     * @param colors Source of the color data.
     */
    void prepare_data(size_t start_index,
                      size_t points_size,
                      const ScatterModel &model,
                      const ColorData &colors);
};
 
#endif