Question

I am creating a live wallpaper using openGL ES 2.0.
The app works great in my nexus one but it doesn’t not show anything in a Nexus S.

Things I have tested so far:

• I have already checked this question. My texture is 128×128 so I guess this isn’t the issue.

• I have used the checkGlError method in my code and I found that it passes the onSurfaceCreated and onSurfaceChanged without issues. The method throws an exception if I call it in the first line of the onDrawFrame() method.

The checkGlError code is the following:

private void checkGlError(String op) {
    int error;
    while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
        Log.e(TAG, op + ": glError " + error);
        throw new RuntimeException(op + ": glError " + error);
    }
}

I notice that the error occurs in both devices, but it looks critical in the nexus S while it draws fine in the nexus one. My guess is that the shader is not compiled correctly and there is an issue there.

Do you know other incompatibilities between the nexus S and the nexus one?
Is there a way of debugging shader’s code?

Answer 1

In the end my issue was related to this question.

When reading from resources Android resized my texture. I solved it reading the texture from the raw folder:

public void loadBitmap(int resourceId) {

        textureId = resourceId;

        /* Get the texture */
        InputStream is = mContext.getResources().openRawResource(textureId);
        Bitmap bitmap;

        try {
            bitmap = BitmapFactory.decodeStream(is);
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                // Ignore.
            }
        }

        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        Buffer data = ByteBuffer.allocateDirect(width * height * 4);
        bitmap.copyPixelsToBuffer(data);
        data.position(0);

        // Bind the texture object
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextures.get(0));
        ...
        // OpenGL stuff
        ...
    }