Re: [android-developers] GLUtils.texImage2D

Don't flip the bitmap, flip your texture coordinates. It's easier and less work for the device.

On Jan 14, 2013 7:03 AM, "bob" <bob@coolfone.comze.com> wrote:

Has anyone else noticed that GLUtils.texImage2D seems to want the image to be upside down?

GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);

One way to see this is to look at Cosmin Banu's NeHe code here:

http://code.google.com/p/nehe-android/source/browse/trunk/NeHe06/src/ro/brite/android/nehe06/Utils.java

He has this in there:

      private static Matrix yFlipMatrix;

        

        static

        {

                yFlipMatrix = new Matrix();

                yFlipMatrix.postScale(1, -1); // flip Y axis

        }

And this:

return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), yFlipMatrix, false);

I have independently noticed this, and it caused a lot of frustration.

Any ideas how to best solve this?  Obviously, if we "just fix it", it will break a lot of old code that relies on its currently incorrect behavior.

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