Re: [Freeglut-developer] [Freeglut-bugs] FreeGLUT alpha problem

[steve <sjb...@ai...>]

Fay John F Dr CTR USAF AFSEO/SK wrote:
> WHOOPS!  I spent a good bit of time today tracking down the problem on 
> Linux.  On Windows it's fairly simple:  the code isn't implemented yet.  
> The Windows code is found starting around line 174 of 
> freeglut_windows.c; it doesn't mention alphas at all.  For that matter, 
> I don't see much about red, green, or blue bits independently of each 
> other either.  There is something in there about color bits.
> 
> Digging through the help file (I selected the "PIXELFORMATDESCRIPTOR" 
> ekyword and pressed F1 for help) I find the following helpful message:
> 
> <quote>
> cAlphaBits
> Specifies the number of alpha bitplanes in each RGBA color buffer. Alpha 
> bitplanes are not supported.
> </quote>
> 
> I'm pretty sure this is why I didn't put the alpha support in when I 
> went over this part of the code earlier.  Does this indeed mean that we 
> are out of luck in this department?

Well, I would take a sneaky peek at what GLUT (Nate Robin's port for 
Windows that is) - you should be able to see the Windows code that does
this and figure out what it's doing.