Comment # 21
on bug 104602
from Jason Playne
(In reply to Connor Abbott from comment #20) > I wanted to make sure that improving the NIR path to reach parity with TGSI > in local variable handling wouldn't break things, so I investigated this a > bit more. It seems this is triggered by the fact that on Vega the TGSI path > always uses scratch, even for smaller local arrays. This bloats the scratch > space used by the VS in question. There are three back-to-back draw calls > with this VS (used to build up the map), each using scratch, and it seems > that radeonsi doesn't properly wait for each call to be done before starting > the next and reuses the same scratch buffer, resulting in the threads from > one draw call overwriting the scratch of the previous call. Hacking > si_update_spi_tmpring_size() to always allocate a new scratch buffer "fixes" > the black triangles. Thanks heaps for looking into the issue Conner. Looking at the explanation on what was happening makes it sound simple - I am sure the debugging effort was far greater! <3
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