https://bugs.freedesktop.org/show_bug.cgi?id=46631
Bug #: 46631
Summary: It's really hard to hit the fast path for the fallback
glReadPixels code
Classification: Unclassified
Product: Mesa
Version: git
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [email protected]
The generic implementation of glReadPixels has two implementations; one that
just memcpy's the data and one that painfully converts each pixel to floats and
back. The first fast-path implementation is really hard to hit because it
doesn't support any transfer ops and Mesa will enable clamping for all of the
common formats. We should be able to ignore clamping in the fast path for the
common case where the format is unsigned normalized and it wouldn't achieve
anything anyway.
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