skybox

void Viewer::filler_skybox(Mesh& m, float startX, float startY)
{
    const float sizeX = 1 / 4.0;
    const float sizeY = 1 / 3.0;

    m.normal(0, 0, 1);

    m.texcoord(startX, startY);
    m.vertex(-1, -1, 0);

    m.texcoord(startX + sizeX, startY);
    m.vertex(1, -1, 0);

    m.texcoord(startX, startY + sizeY);
    m.vertex(-1, 1, 0);

    m.texcoord(startX + sizeX, startY + sizeY);
    m.vertex(1, 1, 0);
}

void Viewer::init_skybox()
{
    for (int i = 0; i < 6; i++)
    {
        m_skybox[i] = Mesh(GL_TRIANGLE_STRIP);
        m_skybox[i].color(Color(1, 1, 1));
    }

    m_skybox_texture = read_texture(0, "data/cubemap/skybox.png");


    filler_skybox(m_skybox[0], 0, 1/3.0); // Gauche
    filler_skybox(m_skybox[1], 1/4.0, 0); // Bas
    filler_skybox(m_skybox[2], 1 / 2.0, 1 / 3.0); // Droite
    filler_skybox(m_skybox[3], 1 / 4.0, 2 / 3.0); // Haut
    filler_skybox(m_skybox[4], 1 / 4.0, 1 / 3.0); // Avant
    filler_skybox(m_skybox[5], 3 / 4.0, 1 / 3.0); // Arrière
}

void Viewer::render_skybox()
{

    gl.lighting(true);
    gl.texture(m_skybox_texture);
    gl.model(Translation(0, 5, -10)*Scale(10, 10, 1));
    gl.draw(m_skybox[4]); // Avant

    gl.texture(m_skybox_texture);
    gl.model(Translation(10, 5, 0)*RotationY(270)*Scale(10, 10, 1));
    gl.draw(m_skybox[2]); // Droite

    gl.texture(m_skybox_texture);
    gl.model(Translation(-10, 5, 0)*RotationY(90)*Scale(10, 10, 1));
    gl.draw(m_skybox[0]); // Gauche

    gl.texture(m_skybox_texture);
    gl.model(Translation(0, -5, 0)*RotationX(270)*Scale(10, 10, 1));
    gl.draw(m_skybox[1]); // Bas

    gl.lighting(false);
    gl.texture(m_skybox_texture);
    gl.model(Translation(0, 5, 10)*RotationY(180)*Scale(10, 10, 1));
    gl.draw(m_skybox[5]); // Arriere

    gl.texture(m_skybox_texture);
    gl.model(Translation(0, 15, 0)*RotationX(90)*Scale(10, 10, 1));
    gl.draw(m_skybox[3]); // Haut

}
/*
Dans le render: render_skybox();
Dans le header:
    void filler_skybox(Mesh &m, float startX, float startY);
    void init_skybox();
    void render_skybox();
    Mesh m_skybox[6];
    GLuint m_skybox_texture;


*/