[Bug 106800] intelReadPixels: fallback to CPU mapping in PBO case for Z24S8 attachments
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sun Jun 3 22:56:52 UTC 2018
https://bugs.freedesktop.org/show_bug.cgi?id=106800
Bug ID: 106800
Summary: intelReadPixels: fallback to CPU mapping in PBO case
for Z24S8 attachments
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/i965
Assignee: intel-3d-bugs at lists.freedesktop.org
Reporter: wickmarkus at web.de
QA Contact: intel-3d-bugs at lists.freedesktop.org
Created attachment 139997
--> https://bugs.freedesktop.org/attachment.cgi?id=139997&action=edit
Apitrace dump of citra showing the performance issue
Hi,
calling glReadPixels for the GL_DEPTH24_STENCIL8 attachment and the
GL_DEPTH_STENCIL / GL_UNSIGNED_INT_24_8 format seems to stall the GPU, even if
a PBO is bound. 92% of my CPU time is spend in intel_miptree_map.
I guess i965 lacks a copy shader for the tiled Z24S8 attachment to the linear
TBO buffer.
Tests was done on: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2)
and mesa: 4affeba1e9eb426a1ba13a3e8ced4673c4bb9b34
An apitrace dump which highlights this issue in the last frames is attached.
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