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  Alpha Blending?  (Read 1112 times)
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Offline PeterNicholson

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« Posted 2012-12-18 17:20:33 »

Hello.
I`ve got a question. How can I make a texture, that will be transparent in some places. Lets take an example of the player. I would like it to be transparent in the background. Can I do it with glEnable()? Please help.  Smiley

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Offline matheus23

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« Reply #1 - Posted 2012-12-18 17:27:24 »

Yes.

Either use
glEnable(GL_ALPHA_TEST);
, then only the purely transparent pixels in your texture will be discarded, or:

use
glEnable(GL_BLEND);
. This will enable blending of semi-transparent pixels. This is much more advanced, and usually you don't need it. Also different draw orders are giving different results... for example if I draw A over B, the resulting color is different than when I draw B over A.

Finally, please google more, and the docs are your friend:
glEnable();
Alpha Test
Blending

<edit>
Also, mind that you can "configure" both the Alpha Test and Blending with
glAlphaFunc(...);
and
glBlendFunc(...);
.
glAlphaFunc is pretty simple, I'd suggest you to "start" with this, since you don't even need something else in most cases,
and you only need blending if you want to do stuff with transparency. Mind that it's much more complicated.
</edit>

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Offline PeterNicholson

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« Reply #2 - Posted 2012-12-18 17:30:41 »

Thanks very much matheus23.  Grin

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Offline matheus23

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« Reply #3 - Posted 2012-12-18 17:31:29 »

Thanks very much matheus23.  Grin

Smiley

Hopefully you've seen the edit ...  Roll Eyes

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Offline Mac70
« Reply #4 - Posted 2012-12-18 17:32:08 »

Just add this into your display creation:

1  
2  
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);


Now you will be able to use transparent textures.

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Offline PeterNicholson

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« Reply #5 - Posted 2012-12-18 17:51:02 »

Hopefully you've seen the edit ...  Roll Eyes

Yes I have, thanks!  Grin

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