Function checkGlError

hello-gl2/app/src/main/cpp/gl_code.cpp:37–41

}

static void checkGlError(const char* op) {
  for (GLint error = glGetError(); error; error = glGetError()) {
    LOGI("after %s() glError (0x%x)\n", op, error);
  }
}

auto gVertexShader =
    "attribute vec4 vPosition;\n"