OpenGL中的glActiveTexture和GL_TEXTURE0的功能是什么? [英] What is the function of glActiveTexture and GL_TEXTURE0 in OpenGL?

问题描述

我正在寻找一种理解为什么需要glActiveTexture的方法.我有以下代码:

I'm finding a way to understand why glActiveTexture is needed. I have the code below:

glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);

如果我想像GL_TEXTURE_2D是挂在墙上的图片框架，而textureId是真实的图片，则glBindTexture是向该框架分配真实图片的唯一命令，那么GL_TEXTURE0和glActiveTexture?

If I imagine that the GL_TEXTURE_2D is a picture's frame hanging on the wall and textureId is the real picture, the glBindTexture is the only command for assigning a real picture to the frame, so, what are GL_TEXTURE0 and glActiveTexture?

我下面的代码能正常工作吗?

Will my code below work fine?

glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_2D, textureId);

glActiveTexture(GL_TEXTURE1);
glTexImage2D(GL_TEXTURE_2D, .....)
glTexParameteri(GL_TEXTURE_2D, ...)

我目前正在使用OpenGL2.1.

I'm currently working with OpenGL2.1.

推荐答案

如果我以为GL_TEXTURE_2D是挂在墙上的图片框架，而textureId是真实的图片，

If I imagine that the GL_TEXTURE_2D is a picture's frame hangging on the wall and textureId is the real picture,

实际上是一个很好的类比:)

Actually a very good analogy :)

那么，GL_TEXTURE0和glActiveTexture是什么?

so, what GL_TEXTURE0 and glActiveTexture are?

考虑一面有多个画框的墙，第一个画框标记为GL_TEXTURE0，第二个画框标记为GL_TEXTURE1，依此类推.

Think about a wall with multiple picture frames, the first frame being labeled GL_TEXTURE0, the second GL_TEXTURE1 and so on.

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