CODEWITHSUNDEEP
androidopengl-estextureview
Michael.Z
Michael.Z

Reputation: 31

Problem in the combination of textureView and OpenGL

Currently I am trying to work with both textureView and OpenGL, and my target is to read the buffer from SurfaceTexture. After lots of searching, I found grafika, but fail to find a suitable example that using textureview.(and, for some reason I have to use textureView)

What I try was that I created a texture and tried to set the textureView to use it:

    @Override
protected void onCreate(final Bundle savedInstanceState) {

    super.onCreate(null);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_textureview);

    displayTextureView=(TextureView) findViewById(R.id.camera_textureview);
    mEglCore = new EglCore(null, EglCore.FLAG_RECORDABLE);
    mOffscreenSurface=new OffscreenSurface(mEglCore,VIDEO_WIDTH,VIDEO_HEIGHT);
    mOffscreenSurface.makeCurrent();
    mFullFrameBlit = new FullFrameRect(
            new Texture2dProgram(Texture2dProgram.ProgramType.TEXTURE_EXT));
    mTextureId = mFullFrameBlit.createTextureObject();
    mCameraTexture = new SurfaceTexture(false);
    mCameraTexture.attachToGLContext(mTextureId);
    displayTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
    displayTextureView.setSurfaceTexture(mCameraTexture);
    mHandler = new MainHandler(this);
    Initialized=true;
}

But then it gitves me the error:

GLConsumer is already attached to a context

I have also found this, but after I tried the method described here what I got from glReadPixels was totally black, so I guess the surfaceTexture must be attached to GLcontext to read the pixels.

Can anybody give me some help?

Upvotes: 0

Views: 1420

Answers (1)

dragonfly
dragonfly

Reputation: 1201

you should refer to this https://github.com/google/grafika/blob/master/app/src/main/java/com/android/grafika/ContinuousCaptureActivity.java

this example use surfaceView , you just need to replace to textureView.

the 386 row:"mDisplaySurface = new WindowSurface(mEglCore, holder.getSurface(), false);" just replace holder.getSurface() with surfacetexture from textureView.

And there is a method to read buffer https://github.com/google/grafika/blob/master/app/src/main/java/com/android/grafika/gles/EglSurfaceBase.java

look at the saveFrame method.

Upvotes: 1

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