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  glColor4f?  (Read 1534 times)
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Offline SkyAphid

Senior Member


Medals: 3
Projects: 1



« Posted 2012-05-19 07:53:10 »

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.

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« Reply #1 - Posted 2012-05-19 08:02:52 »

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

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Offline SkyAphid

Senior Member


Medals: 3
Projects: 1



« Reply #2 - Posted 2012-05-19 17:11:01 »

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

“Life is pretty simple: You do some stuff. Most fails. Some works. You do more of what works. If it works big, others quickly copy it. Then you do something else. The trick is the doing something else.” ~Leonardo da Vinci
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Offline ags1

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« Reply #3 - Posted 2012-05-21 12:37:55 »

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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