GLES20.glGenTextures(1, texture_id, 0);
    GLES20.glBindTexture(texture_target, texture_target);

glTexImage2D(texture_target, 0, GL_RGBA, 640, 480, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    cl_mem camera_image = clCreateFromGLTexture(m_context, CL_MEM_READ_WRITE, texture_target, 0, texture_id, &err);