public 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);
		}
	}
Replaces the fragment shader.  Pass in null to reset to default.
src/net/majorkernelpanic/streaming/gl/TextureManager.java