How to obtain the currently bound texture ID in an openGL ES 2.0 project

Question

In my game, I have:

GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texID);

Where texID is an integer returned by my setTexture() method. Let's say, in this instance it's 1.

When I bind my textures during rendering calls, I don't want to bind this texture every single call. Because I use different atlases of various textures and it's pretty wasteful to keep re-binding a texture when it's not required.

So, I would like to do something like this (Pseudo code)

if (texID != *currentTexture*){
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texID);
}

Therefore, if the texture I want to use is the same as the one already bound, the call to re-bind it will be ignored.

I can't work out how to get the ID of the texture that is currently bound.

I've tried

GLES20.glActiveTexture();

But this doesn't return the textureID, it returns the texture Units

Help appreciated

Edit

I've tried the suggestion below but I'm getting the folowing errors:

When hovering over the underline, this is the error:

I had searched this site and the wider web for a couple of hours before posting here but couldn't find a proper usage example, just this out of context snippet.

Answer 1

You should reconsider whether you really need to do this. Most of the time, querying the GL for such information should be avoided because it has an important performance cost.

Since you are the one doing the glBindTexture calls, you could track the resources yourself instead (this is called client state tracking). It could be as simple as having a global LastBoundTexID variable.

Answer 2

A very quick google search (2 minutes) reveals that you can get the active binding this way in opengl:

GLint whichID;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &whichID);