Android OpenGL combination of SurfaceTexture (external image) and ordinary texture

Question

I would like to mix camera preview SurfaceTexture with some overlay texture. I am using these shaders for processing:

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Answer 1

I might have the same problem as well. after days of trying, I am proposing my solutions here. Hoping this would help others.

firstly, problem statement. just like Lukáš Jezný, I have one preview texture and one overlay texture. it works fine for nexus 4/5 and most of other types, but shows nothing on OPPO find 5, Lenovo A820, Lenovo A720.

solution:

(1)just like Lukáš Jezný, use YUV data and transforming them to RGB in the shader.

(2)multipass drawing, draw the preview texture to the framebuffer once , and read it, then draw it again to the screen.

(3)use another program before you use your own program,

    GLES20.glUseProgram(another one);
    GLES20.glUseProgram(your "real" program);

and it just works for OPPO find 5, Lenovo A820, Lenovo A720 and others. No one knows why......