opengl——VAO是否也存储texrture单元调用

创建VAO、VBO和应用纹理的非常基本的基础是这样的:

unsigned int VBO, VAO, EBO;   //#1
glGenVertexArrays(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_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);

// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// color attribute
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
// texture coord attribute
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glEnableVertexAttribArray(2);    //#2

对于创建纹理:

unsigned int texture1, texture2;  
// texture 1
// ---------
glGenTextures(1, &texture1); //#3
glBindTexture(GL_TEXTURE_2D, texture1); //#4
 // set the texture wrapping parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);   // set texture wrapping to GL_REPEAT (default wrapping method)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// set texture filtering parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// load image, create texture and generate mipmaps
int width, height, nrChannels;
stbi_set_flip_vertically_on_load(true); // tell stb_image.h to flip loaded texture's on the y-axis.
// The FileSystem::getPath(...) is part of the GitHub repository so we can find files on any IDE/platform; replace it with your own image path.
unsigned char *data = stbi_load(FileSystem::getPath("resources/textures/container.jpg").c_str(), &width, &height, &nrChannels, 0);
if (data)
{
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
    std::cout << "Failed to load texture" << std::endl;
}
stbi_image_free(data);  


//some more code , inside the render loop
glActiveTexture(GL_TEXTURE0);   #5
glBindTexture(GL_TEXTURE0, texture1);   #6
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE0, texture1);

glDrawElements(...);
glfwSwapBuffers(...);
//end of render loop

根据我从中学到的 learnopengl ,来自第一线 #1 排队 #2 ,则通话存储在 VAO 这就是为什么我们不必一遍又一遍地写东西,我们只需切换 沃 为了画画。
但是,代码来自第行吗 #3 排队 #6 还存储在 沃 ? 如果是,那我们为什么不直接在第五行后面写第五行呢 #3 ? 如果不是,我们如何将特定的纹理单元链接到特定的纹理单元 沃 如果我们使用多个 VAOs ?

编辑:

在glBindTexture(GL_TEXTURE_2D,texture1)之后,继续进行的纹理调用会影响当前绑定的纹理,不是吗?那么这是否意味着glActiveTexture(…)还会影响当前绑定的纹理吗?为什么我们在使用glBindTexture(…)激活纹理后再次绑定它?