Re: [Mesa3d-users] bug in framebuffer.c

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

Jeff Lee wrote:
> Hi,
> I have encountered a bug in _mesa_update_framebuffer_visual when 
> DEFAULT_SOFTWARE_DEPTH_BITS is set to 31.  This has been there since 
> 6.4.2.  In that function, the fb->Visual.depthBits is getting reset to 
> 32, and then compute_depth_max is setting fb->_DepthMax to some 
> undefined value.  This only happens when I use osmesa, and results in 
> depth buffering artifacts in the resulting hardcopy.  I'm not sure why 
> the value is getting reset from 31 to 32, but can anyone suggest a 
> better fix than
> 
>    if (fb->Attachment[BUFFER_DEPTH].Renderbuffer) {
>       fb->Visual.haveDepthBuffer = GL_TRUE;
>       fb->Visual.depthBits
>          = fb->Attachment[BUFFER_DEPTH].Renderbuffer->DepthBits - 1;
>    }

I'm not sure I understand how this is coming about. Can you send me a 
test program to demo the problem?

-Brian