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frostyfrog
PostPosted: Fri Jul 06, 2012 5:00 am 
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Posts: 7
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I'm fairly sure this has something to do with Slick and not the LWJGL, and there's also a high probability that I did something wrong... Anyways...

I'm having this weird problem when I'm drawing images to the screen, even when I'm drawing them at the resolution of the images (which are both 10x10).
pastebin link with more info: http://pastebin.com/xAAn7zqP

/me goes off to bed.
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davedes
PostPosted: Fri Jul 06, 2012 11:39 am 
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Joined: Sat Jan 27, 2007 7:10 pm
Posts: 1477
See this:
viewtopic.php?p=25911#p25911
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frostyfrog
PostPosted: Fri Jul 06, 2012 6:51 pm 
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Posts: 7
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After following the advice from that code, I changed mine to do the same thing (relatively speaking):
Code:
//before
         glTexCoord2f(0f,0f);
         glVertex2f(Vertices.get(0).x, Vertices.get(0).y);
         glTexCoord2f(0f,1f);
         glVertex2f(Vertices.get(1).x, Vertices.get(1).y);
         glTexCoord2f(1f,1f);
         glVertex2f(Vertices.get(2).x, Vertices.get(2).y);
         glTexCoord2f(1f,0f);
         glVertex2f(Vertices.get(3).x, Vertices.get(3).y);
//after
         glTexCoord2f(0f,0f);
         glVertex2f(Vertices.get(0).x, Vertices.get(0).y);
         glTexCoord2f(0f,10f);
         glVertex2f(Vertices.get(1).x, Vertices.get(1).y);
         glTexCoord2f(10f,10f);
         glVertex2f(Vertices.get(2).x, Vertices.get(2).y);
         glTexCoord2f(10f,0f);
         glVertex2f(Vertices.get(3).x, Vertices.get(3).y);

Although the output is far from desired: Image
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davedes
PostPosted: Fri Jul 06, 2012 8:17 pm 
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Joined: Sat Jan 27, 2007 7:10 pm
Posts: 1477
Your texcoords are incorrect.

glTexCoord takes a normalized texture coordinate in UV space -- this means values between 0 and 1. (Values outside of this range result in texture stretch/repeat/mirror depending on wrap mode.)

Use myTexture.getWidth()/getHeight() to get the normalized value that would be passed to glTexCoord2f. In your case, since your image is 10x10 and it's loaded as a power of two 16x16 texture, the value would be 10 / 16 => 0.625. Refer to my earlier posted code for details. :)

I'd suggest reading up on OpenGL texturing basics before trying to continue... ;)
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frostyfrog
PostPosted: Fri Jul 06, 2012 9:16 pm 
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Posts: 7
Location: United States
Woah, that worked. Thanks! =D

I'll need to remember that for next time (and read up a bit more like you said).
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