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  Color state problems  (Read 2531 times)
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Offline alexsb

Junior Newbie





« Posted 2008-02-26 11:42:44 »

Hi,

I'm having problems with the color state.

The following code does not do what it's supposed to do:

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   gl.glColor3f(0.5f, 0.5f, 0.5f);
      gl.glLineWidth(3.0f);
     
      // should be grey and is
      gl.glBegin(GL.GL_LINES);
      gl.glVertex3f(-1.0f, 1.0f, 0.0f);
      gl.glVertex3f(0.0f, 1.0f, 0.0f);
      gl.glEnd();
     
      gl.glPushAttrib(GL.GL_COLOR_BUFFER_BIT);
      gl.glColor3f(1.0f, 0.0f, 0.0f);
     
      // should be red and is
      gl.glBegin(GL.GL_LINES);
      gl.glVertex3f(-1.0f, 2.0f, 0.0f);
      gl.glVertex3f(0.0f, 2.0f, 0.0f);
      gl.glEnd();
     
      gl.glPopAttrib();
     
      // should be grey but is red
      gl.glBegin(GL.GL_LINES);
      gl.glVertex3f(-1.0f, 3.0f, 0.0f);
      gl.glVertex3f(0.0f, 3.0f, 0.0f);
      gl.glEnd();


so, the color state is not restored properly.

Any ideas what causes that?

Cheers,

Alex
Offline Orangy Tang

JGO Kernel


Medals: 57
Projects: 11


Monkey for a head


« Reply #1 - Posted 2008-02-26 12:11:46 »

RTM.

Quote
The symbolic mask constants and their   associated GL state
     are as follows (the second column lists which   attributes are
     saved):

     GL_COLOR_BUFFER_BIT      GL_ALPHA_TEST enable   bit
               Alpha test function and reference value
               GL_BLEND enable bit
               Blending source and destination functions
               Constant blend color
               Blending equation
               GL_DITHER enable bit
               GL_DRAW_BUFFER setting
               GL_COLOR_LOGIC_OP enable bit
               GL_INDEX_LOGIC_OP enable bit
               Logic op function
               Color mode and index   mode clear values
               Color mode and index   mode writemasks

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Offline alexsb

Junior Newbie





« Reply #2 - Posted 2008-02-26 13:54:15 »

 Roll Eyes

ok - thanks a lot Smiley I guess I interpreded that a little to much.

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