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  Java and OGL-textures - Why the need to flip img?  (Read 1394 times)
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Offline Durandal

Junior Newbie




huh?


« Posted 2003-02-02 08:55:30 »

In all the code I've seen written in java for loading textures the image is flipped (byte-reversed?)  before loading the BufferedImage's data into the direct buffer.

Is this because of different byteorder in the array returned by the Raster and the byteorder preferred by OGL? In the C versions of the tutorials there seem to be no need for this conversion. It doesn't seem to depend on imageformat. Chman's ImageLib perform this operation on all images loaded, even from bmp-source.

I would be very happy if someone could explain exactly why this is necessary in the java code!

Kalle  Smiley

ps.
This post is a cross-post from the josrts.org forums.
ds.
Offline princec

« JGO Spiffy Duke »


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Eh? Who? What? ... Me?


« Reply #1 - Posted 2003-02-02 12:26:50 »

That's just the way it is, and it's the same in C too. (0,0) is the bottom left coordinate; this means an image is loaded in so that it will appear upsidedown.

The image does not need flipping; you just need to flip your brain to accomodate. Adjust the texture coordinates appropriately.

Cas Smiley

Offline Durandal

Junior Newbie




huh?


« Reply #2 - Posted 2003-02-02 12:37:34 »

Ah, NOW I understand, that  didn't cross my mind. But I tell you, even after I read your answer I needed to draw some arrows using pen and paper to fully understand Smiley I guess my brain isn't gl-accelerated yet Wink

Thanx!   Kalle Smiley
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