Android 如何为GL_TEXTURE_EXTERNAL_OES生成mipmap

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当我把cameraTexture渲染到一个低分辨率的SurfaceView时，它看起来是像素化的。

似乎我需要为摄像机纹理生成mipmap，但这样做并不可行。

GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glGenTextures(1, glTextures, 0);
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, glTextures[0]);
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR_MIPMAP_LINEAR);
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
mInputSurfaceTexture = new SurfaceTexture(inputTexture);
mInputSurfaceTexture.setDefaultBufferSize(CCamera.SIZE.getWidth(), CCamera.SIZE.getHeight());
mInputSurfaceTexture.setOnFrameAvailableListener(new CameraFrameListener(), mGLHandler);
mInputSurface = new Surface(mInputSurfaceTexture);
# feed mInputSurface to camera service.
public void onFrameAvailable(SurfaceTexture surfaceTexture) {
    surfaceTexture.updateTexImage();
    GLES20.glGenerateMipmap(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);   
    //GLES11Ext.glGenerateMipmapOES(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);
BTW，那是.的不同。