Commen=
t # 2
on bug 11089=
7
from =
Richard Thier
Created attach=
ment 144512 [details] [revie=
w]
Error gone patch - but it is slow
If I understand it well, HyperZ can be owned by only one process / owner and
the ownership is transferred in the r300_blit.c file when clearing the buff=
ers.
I guess this is why closing an app having HyperZ can transfer it to an other
one without restart. I have figured that this is also the place where buffer
clearing takes place so I played around a bit here.
Other releant files I have found are these:
[code]
src/gallium/drivers/r300/r300_context.c
src/gallium/drivers/r300/r300_emit.c
Update is in here - this sends stuff to card according to how docs say it:=
=20
src/gallium/drivers/r300/r300_hyperz.c
This is where hyperZ gets first activated:
src/gallium/drivers/r300/r300_blit.c
src/gallium/drivers/r300/r300_context.h
Register naming (closely resembles r300 and 500 docs):
src/gallium/drivers/r300/r300_reg.h
[/code]
See the attachment about what I am trying. With this attachment I do not see
the issue anymore. I made this change by just looking at what the code does=
and
how it sets the zmask_clear and hiz_clear variables. As you can see first I=
was
just trying to set them myself, but later just commented out the part you s=
ee.
Interestingly there is a performance drop now - I mean a drop from an uncha=
nged
mesa without HYPERZ enabled to the changed one WITH hiz being enabled with =
the
environment variable. Does the fast clear or some things work even if the f=
lag
is not added?
I am not sure what I do if I comment out the part that I did, but will look
into the HyperZ update function to know what is being sent to the card
registers. I see the registers and can see them in the docs, but I am somet=
imes
puzzled. Does the API between the kernel and user level send the enable Hyp=
erZ
bit in a different var and other parts of the same register in a different =
var
for example? I can also find it on my own I guess, but I need to compare ke=
rnel
and mesa side of the things and maybe someone just knows.
This is how long I went so far - but I am still very much started only a bi=
t.