android opengl texture 的一个有趣现像

我从http://disanji.net/2010/11/27/android-opengl-3d%E7%AB%8B%E6%96%B9%E4%BD%93%E5%A4%9A%E7%BA%B9%E7%90%86%E8%B4%B4%E5%9B%BE%E6%BA%90%E7%A0%81/

下载到Cube_OpenGL，在模拟器上运行正常，但在手机上却显示不出texture。

发现原程序如下位置有问题,

gl.glGenTextures(6, tmp_tex, 0);

gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
for (int i = 0; i < 6; i++)
{
gl.glBindTexture(GL10.GL_TEXTURE_2D, tmp_tex[i]);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp[i], 0);
}

实际应该如下

gl.glGenTextures(6, tmp_tex, 0);
for (int i = 0; i < 6; i++)
{
gl.glBindTexture(GL10.GL_TEXTURE_2D, tmp_tex[i]);

// !!! originally, the following two lines are behind glGenTextures, that should not work,
// however it works on emulators
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
//gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bmp[i], 0);
}