cube-game-plus-plus/client/rendering/Mesh.cpp

#include "client/rendering/Mesh.h"

Mesh::Mesh() : vba(0), vbo(0) {
    glGenVertexArrays(1, &vba);
    glBindVertexArray(vba);

    glGenBuffers(1, &vbo);
    glBindBuffer(GL_ARRAY_BUFFER, vbo);

    glVertexAttribPointer(0, 3, GL_FLOAT, false, sizeof (VertexData), static_cast<GLfloat*> (0));
    glEnableVertexAttribArray(0);

    glVertexAttribPointer(1, 2, GL_FLOAT, false, sizeof (VertexData), static_cast<GLfloat*> (0) + 3);
    glEnableVertexAttribArray(1);

    glVertexAttribPointer(2, 3, GL_FLOAT, false, sizeof (VertexData), static_cast<GLfloat*> (0) + 5);
    glEnableVertexAttribArray(2);
}

Mesh::~Mesh() {
    glDeleteVertexArrays(1, &vba);
    glDeleteBuffers(1, &vbo);
}

void Mesh::add(const VertexData& data) {
    buffer.push_back(data);
}

void Mesh::clear() {
    buffer.clear();
}

void Mesh::build() const {
    glBindBuffer(GL_ARRAY_BUFFER, vbo);
    glBufferData(GL_ARRAY_BUFFER, sizeof (VertexData) * buffer.size(), buffer.data(), GL_STATIC_DRAW);
}

void Mesh::draw() const {
    glBindVertexArray(vba);
    glDrawArrays(GL_TRIANGLES, 0, buffer.size());
}