https://bugs.freedesktop.org/show_bug.cgi?id=93955
Bug ID: 93955
Summary: glXMakeCurrent() drops the buffers of the unbound
drawable
Product: Mesa
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Created attachment 121440
--> https://bugs.freedesktop.org/attachment.cgi?id=121440&action=edit
makecurrent.c
As the attached code demonstrates (see the comment about issue #2), after
switching to a pbuffer and back with glXMakeCurrent(), the depth and stencil
buffers are uninitialized, because they have been dropped and reallocated. The
new depth buffer is all zeros, and the second quad completely fails depth test.
Tested with radeonsi, llvmpipe, softpipe, swrast. The demo renders perfectly
with fglrx.
The above results are with DRI2. With DRI3 the already rendered chessboard is
also partially overwritten with noise.
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