Re: [Mesa3d-users] Using 16 bits and the stencil buffer

[Brian P. <bri...@tu...>]

Joseph Triscari wrote:
> Hello,
> 
>    I am trying use osmesa to generate some rendered imagery in a batch 
> mode. I am generating the images with shadows on variable surfaces using 
> the shadow volume method which requires several bits in the stencil 
> buffer. I would also like to generate 16 bit images. I have found that 
> when I compile and use the 16 bit library (make target is 
> linux-osmesa16-static), the context generates a 1 bit stencil buffer 
> (instead of 8). I have tried using OSMesaCreateContextExt to set the 
> stencil buffer to 8 bits but that does not work either.
> 
>     Is it possible to generate 16 bit color channel images and still 
> have an 8 bit stencil buffer and a 16 bit depth buffer? Is there some 
> set of commands I should have used? Below is the chunk of code that sets 
> up my context. Any help is very much appreciated.
> 
> 
> Joe
> 
> OSMesaCreateContext ctx = OSMesaCreateContextExt(GL_RGBA, 16, 8, 0, NULL);
> OSMakeCurrent(ctx, buffer, GL_UNSIGNED_SHORT, xsize, ysize);
> glGetIntegerv(GL_STENCIL_BITS, &bits);
> if (bits < 8) <Exit with error>

This should work.  Probably a glitch somewhere.  I'll look into it 
later or over the weekend.

-Brian