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  glColor4f?  (Read 2000 times)
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Offline SkyAphid
« Posted 2012-05-19 05:53:10 »

This is my code:

Update:
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      if (alphaIn > 0){
         alphaIn--;
      }
     
      System.out.println(alphaIn);


Render:
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      glEnable(GL_BLEND);
      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     
      glColor4f(0, 0, 0, alphaIn);
      glBegin(GL_QUADS);
      glVertex2f(0, 0);
      glVertex2f(Display.getWidth(), 0);
      glVertex2f(Display.getWidth(), Display.getHeight());
      glVertex2f(0, Display.getHeight());
      glEnd();
     
      glDisable(GL_BLEND);


The problem is that glColor4f doesn't change the alpha channel inbetween 0-255. It only changes when alphaIn is 255 or 0 specifically. So, essentially, it stays black until alphaIn reaches 0, then instantly turns white; completely defeating its purpose.

Insight is appreciated.

it just werks
Offline Riven
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« Reply #1 - Posted 2012-05-19 06:02:52 »

the valid floats are in the range 0..1, not 0..255

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Offline SkyAphid
« Reply #2 - Posted 2012-05-19 15:11:01 »

Oh. Right. I was so tired when I wrote this, I feel ridiculous now...Thanks. lol.

it just werks
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Offline ags1

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« Reply #3 - Posted 2012-05-21 10:37:55 »

I was using this function last night - shouldn't you be using a float with 0.0 being glass and 1.0 being opaque?

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