Java-Gaming.org    
Featured games (79)
games approved by the League of Dukes
Games in Showcase (477)
Games in Android Showcase (107)
games submitted by our members
Games in WIP (536)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Java and OGL-textures - Why the need to flip img?  (Read 875 times)
0 Members and 1 Guest are viewing this topic.
Offline Durandal

Junior Newbie




huh?


« Posted 2003-02-02 09:55:30 »

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 Kernel


Medals: 343
Projects: 3
Exp: 16 years


Eh? Who? What? ... Me?


« Reply #1 - Posted 2003-02-02 13:26:50 »

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 13:37:34 »

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
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

Riven (20 views)
2014-07-29 18:09:19

Riven (13 views)
2014-07-29 18:08:52

Dwinin (12 views)
2014-07-29 10:59:34

E.R. Fleming (31 views)
2014-07-29 03:07:13

E.R. Fleming (12 views)
2014-07-29 03:06:25

pw (42 views)
2014-07-24 01:59:36

Riven (42 views)
2014-07-23 21:16:32

Riven (28 views)
2014-07-23 21:07:15

Riven (29 views)
2014-07-23 20:56:16

ctomni231 (60 views)
2014-07-18 06:55:21
HotSpot Options
by dleskov
2014-07-08 03:59:08

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:58:24

Java and Game Development Tutorials
by SwordsMiner
2014-06-14 00:47:22

How do I start Java Game Development?
by ra4king
2014-05-17 11:13:37

HotSpot Options
by Roquen
2014-05-15 09:59:54

HotSpot Options
by Roquen
2014-05-06 15:03:10

Escape Analysis
by Roquen
2014-04-29 22:16:43

Experimental Toys
by Roquen
2014-04-28 13:24:22
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!