Re: r200 depth readback problem.

[Keith W. <ke...@tu...>]

Philipp Klaus Krause wrote:
> Has anyone else experienced problems reading back depth values with
> the r200 driver?
> 
> Whenever I read back a depth value from the right part
> (about a seventh or eighth of the width) I get 1.0.
> 
> Reading back from other parts of the buffer works OK
> as does software Mesa everywhere.

There is an extensive calculation to derive the address of a particular depth 
value in the depth buffer, which is tiled & swizzled.  Have a look in 
r200_span.c.  If one of the terms of that calculation is incorrect, it could 
produce the symptoms you're seeing.

Keith