最直接的方法

將所有的36個先列出來，然後用glDrawArrays畫出來
1、把所有的36個座標點都列出來：

float vertices[] = {
    //position           //TexCoord
    -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
     0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
    -0.5f, -0.5f, -0.5f,  0.0f
 
, 0.0f,

    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
     0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
    -0.5f,  0.5f,  0.5f,  0.0f, 1.0f,
    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,

    -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
    -0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
    -0.5f
 
, -0.5f, -0.5f,  0.0f, 1.0f,
    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
    -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
     0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
     0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
     0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,

    -0.5f, -0.5f, -0.5f
 
,  0.0f, 1.0f,
     0.5f, -0.5f, -0.5f,  1.0f, 1.0f,
     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,

    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
    -0.5f,  0.5f,  0.5f,  0.0f, 0.0f,
    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f
};

2、繫結頂點位置座標和紋理座標

    unsigned int VBO, VAO;
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);

    glBindVertexArray(VAO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    // position attribute
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    // texture coord attribute
    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
    glEnableVertexAttribArray(1);

3、使用glDrawArrays

glDrawArrays(GL_TRIANGLES, 0, 36);

指定繪製片元的方式

將6個面的點列出來，然後使用indices指定畫圖順序，使用glDrawElements()
1、列出24個點， 和繪圖順序

//cube
    float vertices[] = {
        //position           //texCoord     
        //front 
         0.5f,  0.5f,  0.5f, 1.0f, 1.0f,   //右上
         0.5f, -0.5f,  0.5f, 1.0f, 0.0f,   //右下
        -0.5f, -0.5f,  0.5f, 0.0f, 0.0f,   //左下
        -0.5f,  0.5f,  0.5f, 0.0f, 1.0f,   //左上
        //back
         0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
         0.5f,  0.5f, -0.5f, 1.0f, 0.0f,
        -0.5f,  0.5f, -0.5f, 0.0f, 0.0f,
        -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,    
        //right
         0.5f,  0.5f, -0.5f, 1.0f, 1.0f,   
         0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
         0.5f, -0.5f,  0.5f, 0.0f, 0.0f,
         0.5f,  0.5f,  0.5f, 0.0f, 1.0f,
         //left
        -0.5f,  0.5f,  0.5f, 1.0f, 1.0f,
        -0.5f, -0.5f,  0.5f, 1.0f, 0.0f,
        -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
        -0.5f,  0.5f, -0.5f, 0.0f, 1.0f,
        //top
         0.5f,  0.5f, -0.5f, 1.0f, 1.0f,
         0.5f,  0.5f,  0.5f, 1.0f, 0.0f,
        -0.5f,  0.5f,  0.5f, 0.0f, 0.0f,
        -0.5f,  0.5f, -0.5f, 0.0f, 1.0f,

        //botton
         0.5f, -0.5f,  0.5f, 1.0f, 1.0f,
         0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
        -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
        -0.5f, -0.5f,  0.5f, 0.0f, 1.0f
    };

    unsigned int indices[] = {
        0, 1, 3,
        1, 2, 3,

        4, 5, 7,
        5, 6, 7,

        8, 9, 11,
        9, 10, 11,

        12, 13, 15,
        13, 14, 15,

        16, 17, 19, 
        17, 18, 19,

        20, 21, 23, 
        21, 22, 23,
    };

2、生成並繫結頂點位置座標和紋理座標的Buffer,比方法1增加了片源Buffer(EBO)

    unsigned int VAO, VBO, EBO;
    glGenVertexArray(1, &VAO);
    glGenBuffers(1, &VBO);
    glGenBuffers(1, &EBO);

    glBindVertexArray(VAO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    glBindBuffer(GL_ELEMENT_BUFFER, EBO);
    glBufferData(GL_ELEMENT_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

    //position attribute
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    //texture coord attribute
    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3* sizeof(float)));
    glEnableVertexAttribArray(1);

3、使用glDrawElements()

glDrawElements(GL_TRIANGLES, sizeof(indices), GL_UNSIGNED_INT, 0);