[Bug 110897] HyperZ is broken for r300 (bad z for some micro and macrotiles?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110897

--- Comment #37 from Richard Thier <u9vata at gmail.com> ---
(In reply to Dieter Nützel from comment #35)
> Hello Richard,
> 
> very NICE progress!
> 
> Maybe you can run 'glmark2' with/without HyperZ.

Good idea.

Can you test if HyperZ works for you without any changes? The progress I made
basically only works on my machine but above cosiekvfj seems to have no issues
despite having the same card.

Actually if the gb_pipes number is wrong then the error is not even in the
HyperZ code, but in the code that returns the wrong value from drm - that
HyperZ code is just using.

Oh and keep in mind that I have no HiZ RAM! So if I measure speed gains others
might measure a higher gain if they have HiZ RAM too as I think this way I have
no hierarchical Z-buffer at all - when bigger tiles store min or max z values
of theirs and first they are compared not pixels - but I have this compressed
Z-buffer or zmask_ram - latter which is a lossless compression of the zbuffer.
I read that they use tricks like storing the one-two triangles directions
basically for whole tiles to save some bandwith and/or indicate if a tile is
compressed or not at all.

This latter seems to help memory bandwith in case the triangles are bigger than
the tiles (typically: walls in a game maybe?).

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