gistfile1.txt

void render() {
    // Tiles
    for (int i = 0; i < columns; ++i)
    {
        for (int j = 0; j < rows; ++j)
        {
            glBegin(GL_QUADS);
            glColor3f(0.0, 1.0, 0.0);
            glVertex2f(i*tile_width, j*tile_height);
            glVertex2f(i*tile_width+tile_width, j*tile_height);
            glVertex2f(i*tile_width+tile_width, j*tile_height+tile_height);
            glVertex2f(i*tile_width, j*tile_height+tile_height);
            glEnd();
        }
    }

    // Player
    glBegin(GL_QUADS);
    glColor3f(0.0, 0.0, 1.0);
    glVertex2f(player_x*tile_width, player_y*tile_height);
    glVertex2f(player_x*tile_width+tile_width, player_y*tile_height);
    glVertex2f(player_x*tile_width+tile_width, player_y*tile_height+tile_height);
    glVertex2f(player_x*tile_width, player_y*tile_height+tile_height);
    glEnd();

    glFlush();
}