mesh.cpp

/*
 * MIT License
 *
 * Copyright (c) 2024 Giovanni Santini
 
 * 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.
 *
 */
 
#include "mesh.hpp"
 
#include "engine_logger.hpp"
 
#include <iostream>
 
using namespace brenta;
 
mesh::mesh(std::vector<types::vertex> vertices,
           std::vector<unsigned int> indices,
           std::vector<types::texture> textures, GLint wrapping,
           GLint filtering_min, GLint filtering_mag, GLboolean has_mipmap,
           GLint mipmap_min, GLint mipmap_max)
{
    this->vao.init();
    this->vertices = vertices;
    this->indices = indices;
    this->textures = textures;
    this->vbo = types::buffer(GL_ARRAY_BUFFER);
    this->ebo = types::buffer(GL_ELEMENT_ARRAY_BUFFER);
    this->wrapping = wrapping;
    this->filtering_min = filtering_min;
    this->filtering_mag = filtering_mag;
    this->has_mipmap = has_mipmap;
    this->mipmap_min = mipmap_min;
    this->mipmap_mag = mipmap_max;
 
    setup_mesh();
}
 
void mesh::draw(types::shader_name_t shader_name)
{
    if (this->vao.get_vao() == 0)
    {
        ERROR("Mesh not initialized");
        return;
    }
 
    unsigned int diffuseNr = 1;
    unsigned int specularNr = 1;
    for (unsigned int i = 0; i < this->textures.size(); i++)
    {
        texture::active_texture(GL_TEXTURE0 + i);
        std::string number;
        std::string name = textures[i].type;
        if (name == "texture_diffuse")
            number = std::to_string(diffuseNr++);
        else if (name == "texture_specular")
            number = std::to_string(specularNr++);
        shader::set_int(shader_name, ("material." + name + number).c_str(), i);
        texture::bind_texture(GL_TEXTURE_2D, textures[i].id, this->wrapping,
                              this->filtering_min, this->filtering_mag,
                              this->has_mipmap, this->mipmap_min,
                              this->mipmap_mag);
    }
    texture::active_texture(GL_TEXTURE0);
 
    // draw mesh
    this->vao.bind();
    gl::draw_elements(GL_TRIANGLES, this->indices.size(), GL_UNSIGNED_INT, 0);
    this->vao.unbind();
 
    texture::active_texture(GL_TEXTURE0);
}
 
void mesh::setup_mesh()
{
    this->vbo.copy_vertices(this->vertices.size() * sizeof(types::vertex),
                            &this->vertices[0], GL_STATIC_DRAW);
    this->ebo.copy_indices(this->indices.size() * sizeof(unsigned int),
                           &this->indices[0], GL_STATIC_DRAW);
    this->vao.set_vertex_data(this->vbo, 0, 3, GL_FLOAT, GL_FALSE,
                              sizeof(types::vertex), (void *) 0);
    this->vao.set_vertex_data(this->vbo, 1, 3, GL_FLOAT, GL_FALSE,
                              sizeof(types::vertex),
                              (void *) offsetof(types::vertex, normal));
    this->vao.set_vertex_data(this->vbo, 2, 2, GL_FLOAT, GL_FALSE,
                              sizeof(types::vertex),
                              (void *) offsetof(types::vertex, tex_coords));
 
    gl::bind_vertex_array(0);
}
 
mesh::builder &mesh::builder::set_vertices(std::vector<types::vertex> vertices)
{
    this->vertices = vertices;
    return *this;
}
 
mesh::builder &mesh::builder::set_indices(std::vector<unsigned int> indices)
{
    this->indices = indices;
    return *this;
}
 
mesh::builder &mesh::builder::set_textures(std::vector<types::texture> textures)
{
    this->textures = textures;
    return *this;
}
 
mesh::builder &mesh::builder::set_wrapping(GLint wrapping)
{
    this->wrapping = wrapping;
    return *this;
}
 
mesh::builder &mesh::builder::set_filtering_min(GLint filtering_min)
{
    this->filtering_min = filtering_min;
    return *this;
}
 
mesh::builder &mesh::builder::set_filtering_mag(GLint filtering_mag)
{
    this->filtering_mag = filtering_mag;
    return *this;
}
 
mesh::builder &mesh::builder::set_has_mipmap(GLboolean has_mipmap)
{
    this->has_mipmap = has_mipmap;
    return *this;
}
 
mesh::builder &mesh::builder::set_mipmap_min(GLint mipmap_min)
{
    this->mipmap_min = mipmap_min;
    return *this;
}
 
mesh mesh::builder::build()
{
    return mesh(this->vertices, this->indices, this->textures, this->wrapping,
                this->filtering_min, this->filtering_mag, this->has_mipmap,
                this->mipmap_min, this->mipmap_mag);
}