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  Getting alpha to work  (Read 863 times)
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Offline nhmllr

Senior Devvie


Medals: 1
Projects: 3


slow and steady...


« Posted 2012-07-03 16:53:49 »

Very simple question here

I'm trying to draw a transparent gray rectangle over the entire screen
This draws the gray rectangle:
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glColor3f(.2f, .2f, .2f);
glRecti(0, 0, DISPLAY_WIDTH, DISPLAY_HEIGHT);
glColor3f(1f, 1f, 1f);

Now how do I make it transparent?
Adding this to the front did nothing:
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glAlphaFunc(GL_ALWAYS, .5f);


Thanks
Offline davedes
« Reply #1 - Posted 2012-07-03 18:09:27 »

Enable blending (i.e. at initialization):
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GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);


Then use the alpha component:
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glColor4f(.2f, .2f, .2f, .5f)

Offline nhmllr

Senior Devvie


Medals: 1
Projects: 3


slow and steady...


« Reply #2 - Posted 2012-07-03 19:41:54 »

It works, thanks
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